程勝東　方俊欽　趙盼　徐備　鮑慶中　周永恒　鄧榮敬

1.北京大學(xué)造山帶與地殼演化教育部重點實驗室，北京大學(xué)地球與空間科學(xué)學(xué)院，北京　1008712.沈陽地質(zhì)礦產(chǎn)研究所，沈陽　1100341.

1　引言

作為中亞造山帶東段的重要組成部分，興蒙造山帶記錄了華北板塊與其北部各塊體的碰撞拼合過程，是研究中亞造山帶構(gòu)造演化歷史的重要區(qū)域(黃汲清等,1977,1980; 任紀(jì)舜等,1980; 王鴻禎,1981; 李春昱等,1982; 何國琦和邵濟安,1983; Tang,1990; 邵濟安,1991; Seng?r and Natal’in,1996)。關(guān)于興蒙造山帶的構(gòu)造發(fā)展歷史仍存在重大爭論，焦點集中于古亞洲洋最終閉合的時代及縫合帶的位置。其閉合時間歸結(jié)起來主要有晚志留世(Tang,1990; 趙春荊等,1996)、早-中泥盆世(任紀(jì)舜等,1980; 李春昱等,1982; 王鴻禎,1981; 邵濟安,1986; 唐克東,1992)、晚泥盆-早石炭世(郭勝哲,1986; 曹從周等,1987; 邵濟安,1991; Dobretsovetal.,1995; Xu and Chen,1993; 徐備和陳斌,1997; Khainetal.,2002; Xuetal.,2013)、二疊紀(jì)早期(樊志勇,1996; 王玉凈和樊志勇,1997; 王友等,1999)、二疊紀(jì)末期(Wang and Liu,1986; 王荃等,1991; 和政軍等,1997; Badarchetal.,2002; Xiaoetal.,2003,2009; 孫德有等,2004; 尚慶華,2004; Li,2006; Zhangetal.,2007; 李朋武,2007; Wuetal.,2007; 鄧勝徽等,2009; 李益龍等,2009)等截然不同的觀點。關(guān)于最終閉合的位置，早期的觀點根據(jù)地球物理、植物古地理分區(qū)和放射蟲化石的存在等提出索倫科爾-西拉木倫為縫合線(任紀(jì)舜等,1980; 李春昱等,1982; Tang,1990; 李錦軼等,1986,1987; 王玉凈和樊志勇,1997; 和政軍等,1997; 尚慶華,2004; Xiaoetal.,2003; Windleyetal.,2007)，而唐克東(1992)則認為錫林浩特帶是晚志留世到中泥盆世期間形成的南、北兩大陸塊的縫合帶。李錦軼等(2007)從造山帶構(gòu)造學(xué)分析的角度認為西拉木倫河地區(qū)存在晚古生代碰撞雜巖，從而進一步認定西拉木倫河斷裂帶為西伯利亞板塊與華北板塊的縫合線。而另一些學(xué)者提出“雙沖造山帶”觀點，即興蒙造山帶沿南、北兩條縫合線閉合，北縫合線位于艾力格廟-白音寶力道-錫林浩特一線，南縫合線則位于圖古日格-溫都爾廟地區(qū)(徐備和陳斌,1997; Jianetal.,2008,2010; Xuetal.,2013)。

綜上所述，西拉木倫河地區(qū)處于上述爭議的關(guān)鍵地區(qū)，通過該地區(qū)古生代早期碎屑巖的物源研究，將為古亞洲洋閉合提供重要的證據(jù)。筆者選擇了西拉木倫河北側(cè)林西雙井子地區(qū)和南側(cè)奈曼旗下石碑地區(qū)的志留紀(jì)地層中的碎屑巖，進行了鋯石U-Pb年代學(xué)研究，并試圖通過物源對比討論該區(qū)古亞洲洋的閉合時限。

2　地質(zhì)概述與樣品采集

2.1　區(qū)域地質(zhì)概況

研究區(qū)位于松遼盆地以西、大興安嶺南段的林西至敖漢旗一帶，構(gòu)造位置屬于興蒙造山帶東南段(圖1b)。以西拉木倫河為界將研究區(qū)分為南、北兩部分(圖1c)，其兩側(cè)地層分述如下。

根據(jù)1:20萬劉家營子幅(內(nèi)蒙古自治區(qū)地質(zhì)局第二區(qū)域地質(zhì)測量隊,1968*內(nèi)蒙古自治區(qū)地質(zhì)局第二區(qū)域地質(zhì)測量隊.1968.1:20萬劉家營子幅區(qū)域地質(zhì)調(diào)查報告)、林西縣幅(遼寧省地質(zhì)局第二區(qū)域地質(zhì)測量隊,1971a*遼寧省地質(zhì)局第二區(qū)域地質(zhì)測量隊.1971a.1:20萬林西縣幅區(qū)域地質(zhì)調(diào)查報告)、巴林左旗幅(遼寧省地質(zhì)局第二區(qū)域地質(zhì)測量隊,1971b*遼寧省地質(zhì)局第二區(qū)域地質(zhì)測量隊.1971b.1:20萬巴林左旗幅區(qū)域地質(zhì)調(diào)查報告)和1:25萬林西縣幅(中國地質(zhì)大學(xué)(武漢)地質(zhì)調(diào)查研究院,2007*中國地質(zhì)大學(xué)(武漢)地質(zhì)調(diào)查研究院.2007.1:25萬林西縣幅區(qū)域地質(zhì)調(diào)查報告)區(qū)域地質(zhì)礦產(chǎn)報告可知，北側(cè)地層包括元古界、志留系、二疊系、中生界和新生界。西拉木倫河北岸出露一套灰黑色黑云石英片巖、二云石英片巖夾黑云斜長片麻巖及灰黑色黑云變礫巖，前人將其劃歸為元古代寶音圖群。上志留統(tǒng)杏樹洼組為一套碎屑-碳酸鹽巖沉積組合，包括深灰色-淺綠色粉砂質(zhì)板巖、絹云母片巖以及細晶灰?guī)r，與周圍地層呈斷層接觸關(guān)系(王友等,1999)。粉砂質(zhì)板巖經(jīng)歷了低綠片巖相變質(zhì)作用，巖石變形強烈，劈理發(fā)育；灰?guī)r呈巨厚層狀，未發(fā)生變質(zhì)作用。在小杏樹洼南灰?guī)r中采集到豐富的珊瑚化石，經(jīng)沈陽地質(zhì)礦產(chǎn)研究所鑒定，有珊瑚：Pachyfavositessp.,Zelophyllumsp.indet.,Neomphymasp.,Favositessp.,Brachyelasmasp.,Polyorophesp.,Tryplasmasp.,Thedstromi(Wedekind)；層孔蟲：Stromatoporasp.。據(jù)此將杏樹洼組的時代確定為晚志留世 (王友等,1999)。二疊系下二疊統(tǒng)青鳳山組為中性熔巖、熔巖角礫巖、局部夾有較多的凝灰粉砂巖、凝灰砂巖和砂礫巖；黃崗梁組為板巖、泥質(zhì)板巖、灰黑色凝灰?guī)r和少量結(jié)晶灰?guī)r；上二疊統(tǒng)林西組為輕度變質(zhì)的巨厚狀細砂巖、粉砂巖和粉砂質(zhì)板巖，局部夾灰?guī)r透鏡體。中生界地層主要為灰黃色酸性凝灰?guī)r夾薄層凝灰砂巖、凝灰粗砂巖、砂巖、紫紅色礫巖、砂礫巖。

圖1　研究區(qū)地質(zhì)簡圖(據(jù)內(nèi)蒙古自治區(qū)地質(zhì)礦產(chǎn)局,1991; 李錦軼等,2007; Han et al.,2010; Xu et al.,2013修改)Fig.1　Sketch geological map of study area (modified after BGMRI,1991; Li et al.,2007; Han et al.,2010; Xu et al.,2013)

圖2　野外及鏡下照片(a)-林西淺綠色粉砂質(zhì)板巖與灰?guī)r斷層接觸關(guān)系；(b)-林西淺綠色粉砂質(zhì)板巖顯微結(jié)構(gòu)(+)；(c)-奈曼旗下石碑組砂巖露頭；(d)-奈曼旗下石碑組砂巖顯微結(jié)構(gòu)(+).Q-石英;Lm-變質(zhì)巖巖屑;Cc-碳酸鹽巖屑;Pl-長石;Mu-白云母Fig.2　The field and microscopic photographs(a)-faulted contact relationship between shallow green silty slate and limestone,Linxi area; (b)-microscopic structure of green silty slate,Linxi area (under cross-polarized light); (c)-sandstone of Xiashibei Formation,Naiman Banner; (d)-microscopic structure of sandstone of Xiashibei Formation,Naiman Banner (under cross-polarized light).Q-quartez; Lm-metamorphic rock’s debris; Cc-carbonate rock’s debris; Pl-feldspar; Mu-muscovite

根據(jù)1:20萬下洼幅(內(nèi)蒙古自治區(qū)地質(zhì)局第二區(qū)域地質(zhì)測量隊，1967a*內(nèi)蒙古自治區(qū)地質(zhì)局第二區(qū)域地質(zhì)測量隊.1967a.1:20萬下洼幅區(qū)域地質(zhì)調(diào)查報告)、赤峰幅(內(nèi)蒙古自治區(qū)地質(zhì)局第二區(qū)域地質(zhì)測量隊,1967b*內(nèi)蒙古自治區(qū)地質(zhì)局第二區(qū)域地質(zhì)測量隊.1967b.1:20萬赤峰幅區(qū)域地質(zhì)調(diào)查報告)、敖漢旗幅(遼寧省地質(zhì)局第二區(qū)域地質(zhì)測量隊二分隊,1970a*遼寧省地質(zhì)局第二區(qū)域地質(zhì)測量隊二分隊.1970a.1:20萬敖漢旗幅區(qū)域地質(zhì)調(diào)查報告)、翁牛特旗幅(遼寧省地質(zhì)局第二區(qū)域地質(zhì)測量隊二分隊,1970b*遼寧省地質(zhì)局第二區(qū)域地質(zhì)測量隊二分隊.1970b.1:20萬翁牛特旗幅區(qū)域地質(zhì)調(diào)查報告)、五分地幅(遼寧省地質(zhì)局第二區(qū)域地質(zhì)測量隊,1971c*遼寧省地質(zhì)局第二區(qū)域地質(zhì)測量隊.1971c.1:20萬五分地幅區(qū)域地質(zhì)調(diào)查報告)、克什克騰旗幅(遼寧省地質(zhì)局第二區(qū)域地質(zhì)測量隊,1971d*遼寧省地質(zhì)局第二區(qū)域地質(zhì)測量隊.1971d.1:20萬克什克騰旗幅區(qū)域地質(zhì)調(diào)查報告)區(qū)域地質(zhì)礦產(chǎn)報告可知，南側(cè)地層包括太古界、奧陶系、志留系、泥盆系、石炭系、二疊系、中生界和新生界。太古界稱鞍山群，由一套斜長角閃片麻巖、角閃斜長片麻巖、混合巖、混合花崗巖、大理巖、石英巖夾角閃云母片麻巖、石英云母片巖組成。奧陶系由大理巖、灰?guī)r、結(jié)晶灰?guī)r夾泥質(zhì)頁巖及砂巖、黑云斜長片巖、黑云二長片巖、黑云斜長片麻巖組成。志留系包括5個組，自下而上依次為：中志留統(tǒng)曬勿蘇組結(jié)晶灰?guī)r、泥質(zhì)灰?guī)r夾砂巖；八當(dāng)山組片理化流紋斑巖、凝灰?guī)r夾板巖及薄層泥質(zhì)灰?guī)r；上志留統(tǒng)四道杖棚組黑云斜長片巖、角閃片巖、變質(zhì)砂礫巖、板巖；大朝陽溝組片理化流紋斑巖、絹英片巖；下石碑組灰?guī)r及砂巖。其中，下石碑組地層僅出露于下洼公社下石碑一帶，由海相石灰?guī)r及砂巖、板巖組成，層序清晰，與周圍地層呈斷層接觸關(guān)系。下部為灰白、黑灰色石灰?guī)r；中部主要為黑灰色泥質(zhì)灰?guī)r及石灰?guī)r，泥質(zhì)灰?guī)r中局部含有白云質(zhì)灰?guī)r塊體，石灰?guī)r中富含珊瑚、層孔蟲及苔蘚蟲化石，根據(jù)小泡沫珊瑚(Microplasmasp.)吉林中巢珊瑚(Mesofavositesex gr.jilinensisTchi sp.)和厚巢珊瑚(Pachyfavositessp.)等的存在，將該組劃入志留系上統(tǒng)(1:20萬下洼幅地質(zhì)圖，內(nèi)蒙古自治區(qū)地質(zhì)局第二區(qū)域地質(zhì)測量隊，1967a)。上部主要為褐灰色、灰綠色板巖與粉砂巖互層，板巖呈薄板狀。下泥盆統(tǒng)前坤頭溝組為硬砂巖、板巖夾灰?guī)r。石炭系下部為朝吐溝組絹英片巖和變質(zhì)火山巖、后房身溝組砂巖夾灰?guī)r透鏡體；中部為夾道溝組砂巖、板巖及灰?guī)r；上部為酒局子組砂巖夾石灰?guī)r透鏡體。二疊系青鳳山組為一套碎屑-火山巖巖系，主要有砂巖、板巖、含礫石英砂巖夾灰?guī)r及火山巖。中生界地層主體為一套中酸性火山巖及凝灰?guī)r，局部夾碎屑巖和煤層。

2.2　樣品描述

樣品LX0831-11為粉砂質(zhì)板巖，采于西拉木倫河北岸上志留統(tǒng)杏樹洼組中(GPS坐標(biāo)：43°22′54″N，118°19′24″E)(圖2a)，地層產(chǎn)狀不清，與上下地層多呈斷層接觸關(guān)系。鏡下觀察主要成分為巖屑(50%)、單晶石英(30%)、長石(15%)和少量白云母(5%)。樣品分選差-較差，次棱角狀，雜基支撐，長石蝕變較強。巖屑的成分為多晶石英、變質(zhì)巖等(圖2b)。

樣品130417-06為石英巖屑砂巖，采于奈曼旗下石碑組頂部砂巖層位中(GPS坐標(biāo)：42°29′56″N，121°00′03″E)(圖2c)。地層大致呈近東西向延伸，傾角近直立。鏡下觀察顯示樣品主要成分為巖屑(65%)、單晶石英(30%)、和長石(5%)。樣品為鑲嵌粒狀結(jié)構(gòu)，分選中等、次棱角狀、成熟度低，方解石膠結(jié)。石英均勻消光，顆粒粒徑為0.05～0.2mm，部分石英見有港灣狀熔蝕邊(圖2d)。巖屑粒徑為0.05～0.3mm，成分較為復(fù)雜，主要為各類變質(zhì)巖和碳酸鹽巖屑。

3　樣品測試與年齡分析

3.1　測試方法

樣品采用常規(guī)方法進行破碎，經(jīng)浮選和磁選后，在雙目鏡下挑選出晶形和透明度較好的鋯石顆粒制成樣品靶，鋯石樣品靶的制備與SHRIMP定年鋯石樣品制備方法相同(宋彪等，2002)。鋯石的陰極發(fā)光(CL)顯微照相在北京大學(xué)造山帶與地殼演化教育部重點實驗室完成。

鋯石LA-ICP-MS原位U-Pb同位素年齡分析在北京大學(xué)造山帶與地殼演化教育部重點實驗室完成。測試儀器為電感耦合等離子體質(zhì)譜儀(Agilent 7500c)和準(zhǔn)分子激光剝蝕系統(tǒng)(COMPExPro102)聯(lián)機，激光器為ArF準(zhǔn)分子激光器。激光剝蝕束斑直徑為32μm，激光能量密度為10J/cm2，剝蝕頻率為5Hz。實驗中采用He作為剝蝕物質(zhì)的載氣，Ar為輔助氣。鋯石年齡計算采用標(biāo)準(zhǔn)鋯石Plesovice(337Ma)作為外標(biāo)(Slámaetal.,2008)，標(biāo)準(zhǔn)鋯石91500為監(jiān)控盲樣(Wiedenbecketal.,1995)。元素含量采用國際標(biāo)樣NIST610作為外標(biāo)，29Si為內(nèi)標(biāo)元素進行校正。剝蝕樣品前先進行15次激光脈沖的預(yù)剝蝕，采集20s的空白，隨后進行62s的樣品剝蝕，剝蝕完成后進行2min的樣品池沖洗。采樣方式為單點剝蝕，每完成5個測點的樣品測定，加測標(biāo)樣一次。在15個鋯石樣品點前、后各測2次NIST610。樣品的同位素比值和元素含量數(shù)據(jù)處理采用GLITTER4.4.2程序計算，普通鉛校正使用Anderson(2002)給出的程序計算，加權(quán)平均年齡及諧和圖的繪制使用Isoplot/Ex(3.0)完成(Ludwig,2003)。分析數(shù)據(jù)及鋯石U-Pb諧和圖給出誤差為1σ，95%的置信度。

3.2　分析結(jié)果

對西拉木倫河北岸志留紀(jì)粉砂質(zhì)板巖樣品(LX0831-11)隨機選取75顆鋯石進行測定，其測試結(jié)果見表1。鋯石年齡均處于諧和線上，結(jié)合鋯石CL圖像(圖3)及U-Pb諧和圖(圖4)特征，可將其分為三組，由新自老依次為：385～531Ma(N=52)、872～1097Ma(N=11)、1344～1901Ma(N=11)。第一組年齡(385～531Ma)的峰值為412Ma，鋯石CL圖像多呈自形柱狀，長寬比為1:1～2:1，晶體形態(tài)總體較好，巖漿振蕩環(huán)帶清晰，Th/U值在0.12～2.02之間，顯示了巖漿鋯石的特征。第二組年齡(872～1097Ma)和第三組年齡(1344～1901Ma)的鋯石CL圖像顯示結(jié)構(gòu)較為復(fù)雜，晶體形態(tài)較差，呈半自形-他形，環(huán)帶發(fā)育不均，Th/U值在0.02～1.62之間，除其中45號點的Th/U值為0.02，具有變質(zhì)鋯石的特征之外，多為巖漿成因。

對奈曼旗下石碑地區(qū)砂巖樣品(130417-06)隨機選取75顆鋯石進行年齡測試，其結(jié)果見表1。鋯石CL圖像見圖3。所測試的鋯石點中，除了6個點的207Pb/235U年齡與206Pb/238U年齡相對誤差大于10%而未參加計算之外，其余點的鋯石年齡均處于諧和線上(圖5)。根據(jù)年齡值，將其由新到老依次分為四組：370～523Ma(N=34)、884～1481Ma(N=21)、1573～1900Ma(N=6)、2369～2588Ma(N=8)。第一組年齡(370～523Ma)的峰值為412Ma，鋯石CL圖像顯示具有一定的磨圓度，鋯石振蕩環(huán)帶清晰，Th/U值為0.3～1.23。第二組年齡(884～1481Ma)、第三組年齡(1573～1900Ma)和第四組年齡(2369～2588Ma)的CL圖像顯示多數(shù)鋯石環(huán)帶發(fā)育，但晶形較差，呈半自形-他形；Th/U值為0.14～1.79，顯示巖漿鋯石特征。

表1林西杏樹洼組粉砂質(zhì)板巖和奈曼旗下石碑組砂巖鋯石U-Pb測年結(jié)果
Table 1Results of LA-ICP-MS zircon U-Pb age dating for the Xingshuwa Formation silty slate in Linxi area and Xiashibei Formation sandstone in Naiman Banner area

序號232Th(×10-6)238U(×10-6)Th/U同位素比值年齡(Ma)207Pb/206Pb207Pb/235U206Pb/238U207Pb/206Pb207Pb/235U206Pb/238U比值1s比值1s比值1s年齡1s年齡1s年齡1sLX0831?11175 98187 510 410 054870 002620 493780 023110 065270 001407774071640862111 95189 640 590 057160 002670 627550 028860 079630 001249875495184947354117 670 460 055330 004280 514580 039210 067460 001324261364222642184122 38147 120 830 054890 005810 478410 050170 063210 001254082003973439585200 74553 040 360 055370 001470 510680 013330 06690 0008342736419941756109 26201 720 540 05460 00260 486320 022740 06460 0009839678402164046764 7102 350 630 072340 003161 598430 068990 160260 002459966397027958148537 09868 460 620 161710 0023710 429140 153890 467790 00519247412247414247423952 6754 30 970 074980 004831 854130 11840 179370 00317106810010654210641710191 35652 20 290 06910 001391 430510 028440 150160 001779022290212902101170 92234 880 300 069420 002061 469910 042820 153570 0021891137918189211212267 97341 770 780 055290 002010 518310 018510 067990 000924245542412424613178 3247 140 720 054330 002280 491390 020240 06560 00097385664061441061479512 770 150 1090 001874 598470 078820 306010 003491783161749141721171565 4458 411 120 074010 007231 792240 174330 175640 00332104216810436310431816151 76246 80 610 055590 002290 527980 021340 068890 000984366543014429617201 13249 930 800 05490 002250 496750 019950 065630 00093408644101441061875 23125 430 600 054480 005390 478590 046980 063720 001163911893973239871964 3103 580 620 054980 004540 498310 04060 065740 001274111494112841082035 7271 840 500 05470 007470 481330 065210 063820 001484002633994539992157 7152 670 380 054590 002810 481510 024290 063980 001053958439917400622140 12219 270 640 05460 002640 482050 022930 064040 00096396803991640062394 91186 770 510 11110 002714 953780 12070 323410 004211817261811211806212490 84207 250 440 055180 002450 500860 021820 065840 0014207041215411625417 64605 810 690 055770 001480 548510 014290 071340 0008744336444944452686 59114 870 750 098620 003443 585110 123980 263680 0037215984315462715091927153 82159 990 960 055410 007530 525570 071080 068810 001274292714294742982848 54337 420 140 055450 00270 529360 025530 069240 000934308443117432629110 73148 30 750 054720 004390 487090 038610 064570 001164011474032640373088 08193 830 450 075580 002361 913540 059080 183640 002610843910862110871431105 44228 160 460 055650 002380 550010 022990 071690 00108438664451544663293 68165 630 570 054890 006310 486580 055710 06430 001084082284033840273383199 420 420 101780 002414 107120 097020 29270 0037916572516561916551934127 55197 810 650 054470 002540 470180 021460 062610 000963917539115391635374 57428 740 870 054140 001630 488790 014390 065480 000853774340410409536129 85354 690 370 070010 001941 490930 04050 154480 0021492933927179261237107 74182 40 590 055190 005140 497020 046080 065320 001024201814103140863882 72220 780 370 090160 002323 094420 079010 248940 003131429301431201433163981 66124 840 650 055290 004610 517260 042560 067860 0012942415142328423840118 7235 690 500 055520 002770 528970 025960 069110 001034338343117431641146 39234 030 630 094610 002553 46860 092860 265930 0034815203115202115201842454 89303 951 500 109160 002014 348220 079790 288940 003481785171703151636174346 4975 930 610 054230 004860 46030 040670 061570 001283811623842838584454 01446 090 120 056350 001580 529040 014520 068110 0008646639431104255459 66528 50 020 112950 002695 152260 122750 330870 0049318472318452018432446116 94238 560 490 055080 00310 515880 028680 067940 00101415984221942464745 6790 160 510 055650 005580 53910 053580 070270 0013643818943835438848196 65238 930 820 069940 001861 480960 038850 15360 00195927339231692111

續(xù)表1
Continued Table 1

序號232Th(×10-6)238U(×10-6)Th/U同位素比值年齡(Ma)207Pb/206Pb207Pb/235U206Pb/238U207Pb/206Pb207Pb/235U206Pb/238U比值1s比值1s比值1s年齡1s年齡1s年齡1s4932 0943 860 730 086240 004352 760620 138080 232210 004111344691345371346225048 2223 872 020 056960 00970 674030 113990 085840 00246490324523695311551148 5191 821 620 116330 003185 497310 149680 342790 0047119012919002319002352133 89209 290 640 054940 005980 495710 053560 065440 0011941021040936409753274 97436 940 630 055590 001670 538510 015890 070270 000924364243710438654196 43170 231 150 055240 00590 51330 054470 067410 001174222084213742175577 05159 810 480 054890 002930 494860 025970 06540 00102408904081840865681 17143 230 570 055580 003390 532830 032040 069540 0011643610443421433757122 08230 930 530 055230 002670 509840 024270 066960 000994228041816418658111 14128 80 860 054990 003950 501830 035660 06620 00114121304132441375982 89337 580 250 055030 001770 50830 015990 0670 000894134741711418560223 62288 880 770 05520 002190 506470 019780 066550 000914206341613415661117 58179 460 660 076060 001831 943630 046010 185370 0024110972710961610961362259 15397 610 650 055980 001820 567630 018070 073550 00102452464561245866354 37179 670 300 056160 002570 573420 025770 074070 00114459724601746176452 06109 390 480 054890 003190 489920 027980 064750 0011408974051940476536 17399 760 090 069450 001531 387480 030040 144920 0017891225884138721066170 96190 220 900 055370 004190 531140 039880 069590 00114271414332643476736 02107 60 330 070560 002241 535050 047860 157820 002289454094519945136865 74207 730 320 055830 002170 561390 021330 072940 00106446584521445466940 53123 970 330 055460 004080 515280 037470 06740 0011743113242225420770114 46177 630 640 054880 00270 496310 024010 06560 001024078040916410671156 23275 860 570 055580 002050 531710 019150 06940 000994365543313433672125 32203 540 620 09290 002373 314310 083840 25880 0032814862914842014841773151 99269 810 560 057140 001890 63050 020420 080040 00114974749613496774127 61182 250 700 055490 003220 535450 030690 070 001074321014352043667576．53258．260．300．055450．00240．519490．02210．067970．0009943069425154246130417?06177 55174 530 440 054680 000910 487360 00770 064660 0006539918403540442113 17206 170 550 302160 0044924 11220 269310 578750 00567348124327311294423393 0384 261 100 076990 001622 016380 040880 190020 00228112122112114112112467 32146 220 460 068670 0011 391220 019090 1470 001468891488588848588 54166 080 530 054680 001740 477050 014580 06330 0008339945396103965666 71174 510 380 162160 0018310 468710 110440 468390 0045224788247710247620721 1854 190 390 083380 001742 507390 050560 218180 002671278211274151272148512 57421 311 220 055060 000820 504820 00710 066520 0006541515415541549180 02249 320 720 0550 000960 498630 008270 065780 0006741220411641141039 2870 480 560 055630 001520 539540 014230 070370 00084438384389438511226 4274 850 820 062280 00110 55390 00930 064530 0006668419448640341258 59178 080 330 110720 001254 956550 052050 324810 00307181191812918131513113 49189 460 600 054670 001190 478470 009970 06350 0006939928397739741477 71136 270 570 055640 001780 482540 014860 062920 00083438454001039351572 35152 060 480 054180 001680 453750 013520 060760 00078379443809380516356 54760 480 470 054620 000940 471560 007680 062640 0006339719392539241792 59200 40 460 054540 001110 470140 009150 062540 0006739325391639141894 7195 770 990 167070 0042810 015450 22670 434770 0051925294424362123272319159 6357 610 450 054420 001060 460820 008510 061440 0006438823385638442099 1165 60 600 054560 000970 471750 007950 062730 00063394213925392421247 8280 50 880 072450 000971 553160 019520 155540 00151999129528932822631 37511 341 230 053840 000920 43830 00710 059060 0005936419369537042347 68171 640 280 074990 001131 863670 026590 180310 0018410681410689106910

續(xù)表1
Continued Table 1

序號232Th(×10-6)238U(×10-6)Th/U同位素比值年齡(Ma)207Pb/206Pb207Pb/235U206Pb/238U207Pb/206Pb207Pb/235U206Pb/238U比值1s比值1s比值1s年齡1s年齡1s年齡1s2466 2133 160 500 054460 001480 467970 012210 062340 00073390383908390425131 61203 970 650 054580 001980 478170 016720 063560 0009395533971139752655 89106 030 530 05490 001370 490150 011760 064780 00073408344058405427110 95348 570 320 165770 0018110 949010 110220 479210 0044825158251992524202821 551 490 420 08770 001752 605950 050070 215580 0025813762013021412581429158 46162 240 980 086710 001182 697750 03460 225740 0022513541113281013121230235 6321 320 730 054430 001330 466120 01090 062130 0007138932389838943160 59113 460 530 078560 002322 010830 054920 185630 0020911616011191910981132168 44252 070 670 054950 000930 499690 007980 065980 00066410194115412433163 6270 830 600 070850 000861 568830 01760 160650 00151953109587960834331 37529 870 630 165760 0017810 861730 106650 475430 00438251572511925071935243 59305 080 800 090870 002452 369730 058890 189130 0019714445312341811171136149 47208 990 720 101080 001324 059420 049960 291390 0029116441016461016481537167 24218 730 760 055630 001840 530040 016850 069120 00093438474321143163821 2761 060 350 07870 00122 159570 031270 199090 0020411651411681011701139163 65510 110 320 055970 00070 562360 006530 07290 00068451124534454440172 09189 80 910 055740 001060 54590 009880 071060 00074442224426443441149 45182 760 820 173120 0020711 767730 132910 493170 00495258882586112584214277 32418 710 180 071490 001071 599530 022520 162340 0016397114970997094346 6441 261 130 152040 004789 500920 268890 453220 006192369552388262410274475 4101 420 740 09730 001233 72160 044230 27750 0027115731015761015791445275 34336 340 820 076180 0011 848030 022620 1760 0017110011106381045946144 22236 210 610 073550 004671 499690 093330 147890 001821029132930388891047122 41294 130 420 076480 00091 964730 02140 186370 00175110810110471102104859 19105 170 560 103330 001494 250010 058550 298420 0031416851216841116831649264 66574 790 460 056040 000710 559240 006560 072410 00068454124514451450211 31455 030 460 116310 001335 51840 058230 344250 00324190081903919071651166 22111 381 490 090550 001783 116850 059130 249750 003041437191437151437165260 28146 480 410 103390 001234 24770 047150 298090 0028516869168391682145359 16117 710 500 079050 001062 171690 027330 199320 00195117312117291172105416 8843 820 390 072680 001421 690970 03160 168810 001881005211005121006105583 28109 650 760 164440 0020110 737810 124360 473770 004792502925011125002156133 88232 120 580 05490 001360 485710 011550 064190 0007440833402840145734 7368 010 510 222790 0025618 172650 196550 59180 005823001829991029972458193 38502 40 380 056020 000760 558410 007060 072330 00069453134505450459251 13455 990 550 05580 000940 554910 008790 072160 00072444184486449460101 36268 540 380 056080 000910 56720 008670 073380 0007345617456645646156 7102 780 550 157460 00229 89340 134350 455870 0050924291024251324212362104 74186 370 560 055350 001270 525750 011540 068910 00077426294298430563128 89670 370 190 155150 001799 138670 098170 427350 00409240382352102294186446 1325 080 140 072640 000891 680350 019050 167830 0015810041010017100096555 13247 780 220 072530 000971 665220 020710 166580 001611001129958993966114 11169 60 670 055680 001020 533930 009330 069570 00071440214346434467141 66383 710 370 055840 001280 55250 012130 071790 00081446294478447568151 52330 060 460 056020 001580 535520 014470 069360 000864533843510432569709 541337 350 530 07510 001670 588380 011810 056820 000551071464708356370112 9562 871 800 070290 002211 500880 045650 154930 002299373893119929137188 21170 940 520 054850 000990 498050 008490 065880 00067406214106411472209 53349 20 600 055320 001070 520810 009540 06830 0007142523426642647336 4385 070 430 058240 002560 678070 028770 084470 00141539635261752387462 79204 870 310 056250 001430 571730 013890 073750 00086462334599459575171 23211 870 810 092680 001453 109380 046180 243410 00259148114143511140413

圖3　林西地區(qū)杏樹洼組粉砂質(zhì)板巖和奈曼旗下石碑組砂巖部分鋯石CL圖像Fig.3　CL images of selected zircons from Xingshuwa Formation silty slate in Linxi area and Xiashibei Formation sandstone in Naiman Banner area

圖4　林西地區(qū)杏樹洼組粉砂質(zhì)板巖鋯石U-Pb諧和圖與頻率曲線圖Fig.4　Zircon U-Pb concordia diagram and relative probability plot for detrital zircons from Xingshuwa Formation silty slate in Linxi area

圖5　奈曼旗下石碑組砂巖鋯石U-Pb諧和圖與頻率曲線圖Fig.5　Zircon U-Pb concordia diagram and relative probability plot for detrital zircons from Xiashibei Formation sandstone in Naiman Banner area

4　討論

4.1　北側(cè)粉砂質(zhì)板巖鋯石年齡意義

林西地區(qū)西拉木倫河北岸淺綠色粉砂質(zhì)板巖第一組鋯石年齡為385～531Ma，其峰值為412Ma，可能與早古生代艾力格廟-蘇左旗-錫林浩特巖漿巖帶的剝蝕有關(guān) (Xuetal.,2013)。沿該帶前人報道了大量島弧巖漿巖的鋯石U-Pb年齡，年齡分布在421～490Ma之間(Chenetal.,2000; 石玉若等,2005; Jianetal.,2008; 郭鋒等,2009; 葛夢春等,2011;孫立新等,2013)。第二組鋯石年齡為872～1097Ma。根據(jù)前人的年代學(xué)研究，華北板塊內(nèi)部沒有該期巖漿作用記錄，但它在興蒙造山帶卻普遍存在。例如Xuetal.(2013)通過對蛇綠混雜帶基質(zhì)的碎屑鋯石研究，認為內(nèi)蒙古中部存在一個未出露的渾善達克地塊，其基底年齡主要集中于576～1044Ma；王炎陽等(未發(fā)表資料)對克什克騰旗五道石門基性火山巖鋯石U-Pb年齡分析發(fā)現(xiàn)存在760～950Ma的繼承性鋯石。第三組年齡(1344～1901Ma)的鋯石也只見于興蒙造山帶內(nèi)，例如前人在本研究區(qū)以北的二疊紀(jì)沉積巖中發(fā)現(xiàn)中-新元古代碎屑鋯石，其時代介于564～1557Ma(韓國卿等,2011)。顯然，第二、三組元古代鋯石應(yīng)來源于興蒙造山帶的元古代基底，第一組鋯石與早古生代巖漿弧的剝蝕有關(guān)，而最年輕的鋯石U-Pb諧和年齡值為385±8Ma，限定樣品所在地層的沉積下限為中-晚泥盆世。

4.2　南側(cè)砂巖鋯石年齡意義

位于西拉木倫河南岸的奈曼旗下石碑組砂巖第一組鋯石年齡為370～523Ma，其峰值為412Ma，其中的較老鋯石(500～400Ma)可能與早古生代華北板塊北緣發(fā)育的圖古日格-達茂旗-溫都爾廟-鑲黃旗-解放營子島弧巖漿巖帶有關(guān)。這些島弧巖漿巖的年齡為490～404Ma(圖1b; 劉敦一等,2003; 張維和簡平,2008; 秦亞等,2013; 劉建峰等,2013; Jianetal.,2008; Xuetal.,2013; Zhangetal.,2012)。另外，年齡譜中還包含較多380～400Ma的碎屑鋯石年齡，可能來源于該島弧巖漿巖帶南側(cè)的早-中泥盆世堿性巖(曾俊杰,2009; 張曉輝和翟明國,2010; Miaoetal.,2002)及基性侵入巖(Zhangetal.,2009)。樣品中最年輕的鋯石U-Pb諧和年齡值為370±4Ma，限定地層沉積下限為晚泥盆世。值得注意的是，樣品中出現(xiàn)多顆0.9～1.5Ga的鋯石年齡(共21顆)。大量研究表明，該年齡段是興蒙造山帶范圍的典型特征(Rojas-Agramonte,2011; Xuetal.,2013)。第四組2369～2588Ma的鋯石反映出華北板塊的物源信息。綜上，奈曼旗下石碑組的鋯石既有興蒙造山帶、也有華北板塊的物源，這表明志留-泥盆紀(jì)時期華北板塊與興蒙造山帶之間已經(jīng)沒有沉積阻隔，興蒙造山帶的剝蝕物已經(jīng)到達西拉木倫河南側(cè)的華北板塊北緣。

4.3　南北兩側(cè)鋯石年齡與松遼地塊的對比

本文測試的林西地區(qū)西拉木倫河淺綠色粉砂質(zhì)板巖(LX0831-11)和奈曼旗下石碑組砂巖(130417-06)分屬西拉木倫河兩岸，但卻顯示出一致的志留-泥盆紀(jì)及晚元古代碎屑鋯石年齡譜，表明兩者從泥盆紀(jì)即具有相同的沉積物源(圖6a,b)。松遼地塊處于華北板塊以北的興蒙造山帶內(nèi)，Wangetal.(2013)通過對松遼-張廣才嶺塔東群碎屑鋯石的研究，提出了松遼地塊的鋯石年齡分布模式(圖6c)。對比發(fā)現(xiàn)，西拉木倫河南、北兩側(cè)樣品的碎屑鋯石年齡與松遼地塊有著明顯的相似性，不僅均具有早古生代末期的年齡信息，而且其繼承性鋯石也具有相同的年齡分布(圖6)，暗示西拉木倫河南、北兩側(cè)的沉積物源與松遼地塊有關(guān)。

圖6　鋯石年齡頻率分布與松遼地塊年齡譜對比(松遼地塊數(shù)據(jù)來源于Wang et al.,2013)Fig.6　Comparison of probability plots for our two samples and Songliao Block (the data of Songliao Block comes from Wang et al.,2013)

5　構(gòu)造意義

本文所測試的兩個樣品分別位于西拉木倫河北岸的雙井子地區(qū)和南岸的奈曼旗地區(qū)，分屬前人所述的晚古生代“西拉木倫河縫合線”兩側(cè)，二者從泥盆紀(jì)到元古代碎屑鋯石年齡的相似性說明它們從中-晚泥盆世以來已經(jīng)具有共同的物源；而代表興蒙造山帶的元古代碎屑鋯石在奈曼旗地區(qū)的出現(xiàn)，說明泥盆紀(jì)以來興蒙造山帶的剝蝕物已到達華北板塊北緣。因此，本次碎屑鋯石年代學(xué)研究暗示華北板塊與其北部松遼地塊在中-晚泥盆世之前已經(jīng)完成拼合過程，即此時兩者間已不存在古亞洲洋。

另外，前人根據(jù)古生物化石依據(jù)在林西地區(qū)西拉木倫河北岸劃分出志留紀(jì)杏樹洼組，并與南岸奈曼旗地區(qū)志留系下石碑組對比(內(nèi)蒙古自治區(qū)地質(zhì)礦產(chǎn)局,1991)。從本次研究獲得的碎屑鋯石年齡數(shù)據(jù)看，這兩個地區(qū)存在中、晚泥盆世地層。因此，對西拉木倫河兩岸志留-泥盆系做更詳細的研究將會為古亞洲洋的構(gòu)造演化過程提供更多的約束。

6　結(jié)論

(1)西拉木倫河北岸的雙井子地區(qū)杏樹洼組碎屑鋯石年齡分為三組，由新自老依次為：385～531Ma(N=52)、872～1097Ma(N=11)和1344～1901Ma(N=11)，碎屑鋯石的最小年齡限定地層沉積下限為中-晚泥盆世；南岸的奈曼旗地區(qū)下石碑組碎屑鋯石年齡分為四組，由新自老依次為：370～523Ma(N=34)、884～1481Ma(N=21)、1573～1900Ma(N=6)、2369～2588Ma(N=8)。碎屑鋯石的最小年齡限定地層沉積下限為晚泥盆世。

(2)西拉木倫河南、北兩側(cè)原志留紀(jì)樣品顯示出一致的志留-泥盆紀(jì)及晚元古代碎屑鋯石年齡譜，表明兩者從志留-泥盆紀(jì)即開始接受來自興蒙造山帶的沉積物源。物源相似性表明華北板塊與其北部松遼地塊在中-晚泥盆世已經(jīng)完成拼合過程。

致謝感謝王炎陽、廖聞、張辰昊、羅志文等在野外工作中給予的大力幫助;感謝北京大學(xué)造山帶與地殼演化教育部重點實驗室馬芳高級工程師在年齡測試過程中進行的指導(dǎo)。

Anderson T.2002.Correction of common lead in U-Pb analyses that do not report204Pb.Chemical Geology,192(1-2): 59-79

Badarch G,Gunningham WD and Windley BF.2002.A new terrane subdivision for Mongolia: Implications for the Phanerozoic crustal growth of Central Asia.Journal of Asian Earth Sciences,21(1): 87-110

Bureau of Geology and Mineral Resources of Inner Mongolia Autonomous Region (BGMRI).1991.Regional Geology of Inner Mongolia Autonomous Region.Beijing: Geological Publishing House,1-725 (in Chinese)

Cao CZ.1987.The plate framework of northeastern China.Bulletin of Shenyang Institute of Geology and Mineral Resources,Chinese Academic Geological Sciences,16: 60-67 (in Chinese)

Chen B,Jahn BM,Wilde SA and Xu B.2000.Two contrasting paleozoic magmatic belts in northern Inner Mongolia,China: Petrogenesis and tectonic implications.Tectonophysics,328(1-2): 157-182

Deng SH,Wan CB and Yang JG.2009.Discovery of a Late Permian Angara-Cathaysia mixed flora from Acheng of Heilongjiang,China,with discussions on the closure of the Paleoasian Ocean.Science in China (Series D),52(11): 1746-1755 (in Chinese)

Dobretsov NL,Berzina NA and Buslova MM.1995.Opening and tectonic evolution of the Paleo-Asian Ocean.International Geology Review,37(4): 335-360

Fan ZY.1996.The discovery of Carboniferous oceanic "remnants" in Xingshuwa area,north of Xar Moron River,Inner Mongolia and its tectonic implications.Regional Geology of China,(4): 382 (in Chinese)

Ge MC,Zhou WX,Yu Y,Sun JJ,Bao JQ and Wang SH.2011.Dissolution and supracrustal rocks dating of Xilin Gol Complex,Inner Mongolia,China.Earth Science Frontiers,18(5): 182-195 (in Chinese with English abstract)

Guo F,Fan WM,Li CW,Miao LC and Zhao L.2009.Early Paleozoic subduction of the Paleo-Asian Ocean: Geochronological and geochemical evidence from the Dashizhai basalts,Inner Mongolia.Science in China (Series D),52(7): 940-951

Guo SZ.1986.On determination of convergence time between Siberian plate and Sino-Korean plate and its biostratigraphic evidence.Bulletin of Shenyang Institute of Geology and Mineral Resources,Chinese Academic Geological Sciences,14: 127-136 (in Chinese)

Han BF,Guo ZJ,Zhang ZC,Zhang L,Chen JF and Song B.2010.Age,geochemistry,and tectonic implications of a Late Paleozoic stitching pluton in the North Tianshan suture zone,western China.Geological Society of America Bulletin,122(3-4): 627-640

Han GQ,Liu JY,Wen BQ,Li W,Wu LN,Zhao YL,Ding L,Zhao LM and Liang CY.2011.LA-ICP-MS U-Pb dating of detrital zircons from the Permian sandstones in north side of Xar Moron River suture belt and its tectonic implications.Earth Science,36(4): 687-702 (in Chinese with English abstract)

He GQ and Shao JA.1983.Determination of Early Paleozoic ophiolites in southeastern Nei Mongol and their geotectonic significance.In: Tang KD (ed.).Contributions for the Project of Plate Tectonics in Northern China,No.1.Beijing: Geological Publishing House,243-250 (in Chinese with English abstract)

He ZJ,Liu SW,Ren JS and Wang Y.1997.Late Permian-Early Triassic sedimentary evolution and tectonic setting of the Linxi region,Inner Mongolia.Regional Geology of China,16(4): 403-409,427 (in Chinese with English abstract)

Huang JQ,Ren JS,Jiang CFetal.1977.An outline of the tectonic characteristics of China.Acta Geologica Sinica,51(2): 117-135 (in Chinese with English abstract)

Huang JQ,Ren JS and Jiang CF.1980.The Geologic Evolution of China.Beijing: Science Press (in Chinese with English abstract)

Jian P,Liu DY,Kr?ner A,Windley BF,Shi YR,Zhang FQ,Shi GH,Miao LC,Zhang W,Zhang Q,Zhang LQ and Ren JS.2008.Time scale of an Early to Mid-Paleozoic orogenic cycle of the long-lived Central Asian Orogenic Belt,Inner Mongolia of China: Implications for continental growth.Lithos,101(3-4): 233-259

Jian P,Liu DY,Kr?ner A,Windley BF,Shi YR,Zhang W,Zhang FQ,Miao LC,Zhang LQ and Tomurhuu D.2010.Evolution of a Permian intraoceanic arc-trench system in the solonker suture zone,Central Asian Orogenic Belt,China and Mongolia.Lithos,118(1-2): 169-190

Khain EV,Bibikova EV,Kr?ner A,Zhuravlev DZ,Sklyarov EV,Fedotova AA and Kravchenko-Berezhnoy IR.2002.The most ancient ophiolite of the Central Asian fold belt: U-Pb and Pb-Pb zircon ages for the Dunzhugur Complex,Eastern Sayan,Siberia,and geodynamic implications.Earth and Planetary Science Letters,199(3-4): 311-325

Li CY,Wang Q,Liu XY and Tang YQ.1982.Tectonic Map of Asia (scale 1:8000000).Beijing: Cartographic Publishing House (in Chinese)

Li JY.1986.The principal characteristics of pillow lava in Linxi district and its geotectonic significance.Bulletin of Shenyang Institute of Geology and Mineral Resource,CAGS,14: 65-74 (in Chinese)

Li JY.1987.Essential characteristics of Early Paleozoic ophiolites to north of Xar Moron river,eastern Nei Mongol and their plate tectonic significance.In: Shenyang Institute of Geology and Mineral Resource (ed.).Contributions to the Project of Plate Tectonics in Northern China,No.2.Geological Publishing House,136-150 (in Chinese with English abstract)

Li JY.2006.Permian geodynamic setting of Northeast China and adjacent regions: closure of the Paleo-Asian Ocean and subduction of the Paleo-Pacific Plate.Journal of Asian Earth Sciences,26(3-4): 207-224

Li JY,Gao LM,Sun GH,Li YP and Wang YB.2007.Shuangjingzi middle Triassic syn-collisional crust-derived granite in the east Inner Mongolia and its constraint on the timing of collision between Siberian and Sino-Korean paleo-plates.Acta Petrologica Sinica,23(3): 565-582 (in Chinese with English abstract)

Li PW,Gao R,Guan Y and Li QS.2007.Paleomagnetic constraints on the collision of Siberian and North China blocks,with a discussion on the tectonic origin of the ultrahigh-pressure metamorphism in the Sulu-Dabie Region.Acta Geoscientica Sinica,28(3): 234-252 (in Chinese with English abstract)

Li YL,Zhou HW,Zhong ZQ,Zhang XH,Liao QA and Ge MC.2009.Collision processes of North China and Siberian plates: Evidence from LA-ICP-MS zircon U-Pb age on deformed granite in Xar Moron suture zone.Earth Science,34(6): 931-938 (in Chinese with English abstract)

Liu DY,Jian P,Zhang Q,Zhang FQ,Shi YR,Shi GH,Zhang LQ and Tao H.2003.SHRIMP dating of adakites in the Tulingkai ophiolite,Inner Mongolia: Evidence the Early Paleozoic subduction.Acta Petrologica Sinica,77(3): 317-330 (in Chinese with English abstract)

Liu JF,Li JY,Chi XG,Feng QW,Hu ZC and Zhou K.2013.Early Devonian felsic volcanic rocks related to the arc-continent collision on the northern margin of North China Craton: Evidences of zircon U-Pb dating and geochemical characteristics.Geological Bulletin of China,32(2-3): 267-278 (in Chinese with English abstract)

Ludwig KR.2003.Isoplot/Ex: A geochronological tool kit for Microsoft Excel version 3.00.Berkeley: Berkeley Geochronology Center,4: 1-70

Miao LC,Qiu YM,McNaughton N,Luo ZK,Groves D,Zhai YS,Fan WM,Zhai MG and Guan K.2002.SHRIMP U-Pb zircon geochronology of granitoids from Dongping area,Hebei Province,China: Constraints on tectonic evolution and geodynamic setting for gold metallogeny.Ore Geology Reviews,19(3-4): 187-204

Qin Y,Liang YM,Yan JL,Zhang QW and Liu CX.2013.The identification of Early Paleozoic O-type adakitic rocks in Zhengxiangbaiqi area,Inner Mongolia and its significance.Earth Science Frontiers,20(5): 106-114 (in Chinese with English abstract)

Ren JS,Jiang CF,Zhang ZK and Qin DY.1980.The Geotectonic Evolution of China.Beijing: Science Press,89-104 (in Chinese)

Rojas-Agramonte Y,Kr?ner A,Demoux A,Xia X,Wang W,Donskaya T,Liu D and Sun M.2011.Detrital and xenocrystic zircon ages from Neoproterozoic to Palaeozoic arc terranes of Mongolia: Significance for the origin of crustal fragments in the Central Asian Orogenic Belt.Gondwana Research,19(3): 751-763

Seng?r AMC and Natal’in BA.1996.Turkic-type orogeny and its role in the making of the continental crust.Annual Review of Earth and Planetary Sciences,24(1): 263-337

Shang QH.2004.Occurrences of Permian radiolarians in central and eastern Nei Mongol (Inner Mongolia) and their geological significance to the Northern China Orogen.Chinese Science Bulletin,49(24): 2613-2619

Shao JA.1986.The Early Palaeozoic ophiolite in Central Nei Mongol and its significance in reveling the evolution history of the crust.Contributions for the Project of Plate Tectonics in Northern China,No.1.Beijing: Geological Publishing House,158-172 (in Chinese with English abstract)

Shao JA.1991.Crust Evolution in the Middle Part of the Northern Margin of Sino-Korean Plate.Beijing: Peking University Press,1-136 (in Chinese)

Shi YR,Liu DY,Zhang Q,Jiang P,Zhang FQ,Miao LC,Shi GH,Zhang LQ and Tao H.2005.The petrogenesis and SHRIMP dating of the Baiyinbaolidao adakitic rocks in southern Suzuoqi,Inner Mongolia.Acta Petrologica Sinica,21(1): 143-150 (in Chinese with English abstract)

Sláma J,Kosler J,Condon DJ,Crowley JL,Gerdes A,Hanchar JM,Horstwood MSA,Morris GA,Nasdala L,Norberg N,Schaltegger U,Schoene B,Tubrettk MN and Whitehouse MJ.2008.Plesovice zircon: A new natural reference material for U-Pb and Hf isotopic microanalysis.Chemical Geology,249(1-2): 1-35

Song B,Zhang YH,Wan YS and Jian P.2002.Discussion on targets production,age dating,age determination and the related phenomenon of the zircon SHRIMP samples.Geological Review,48 (Suppl.): 26-30 (in Chinese with English abstract)

Sun DY,Wu FY,Zhang YB and Gao S.2004.The final closing time of the West Lamulun River-Changchun-Yanji palte suture zone: Evidence from the Dayushan granitic pluton,Jilin Province.Journal of Jilin University (Earth Science Edition),34(2): 174-180 (in Chinese with English abstract)

Sun LX,Ren BF,Zhao FQ,Gu YC,Li YF and Liu H.2013.Zircon U-Pb dating and Hf isotopic compositions of the Mesoporterozoic granitic gneiss in Xilinhot Block,Inner Mongolia.Geological Bulletin of China,32(2-3): 327-340 (in Chinese with English abstract)

Tang KD.1990.Tectonic development of Paleozoic foldbelts at the north margin of the Sino-Korean Craton.Tectonics,9(2): 249-260

Tang KD.1992.Tectonic Evolution and Metallogenic Regularity of the Fold Belt on the Northern Margin of Sino-Korea Platform.Beijing: Peking University Press,1-277 (in Chinese with English abstract)

Wang F,Xu WL,Gao FH,Zhang HH,Pei FP,Zhang L and Yang Y.2013.Precambrian terrane within the Songnen-Zhangguangcai Range Massif,NE China: Evidence from U-Pb ages of detrital zircons from the Dongfengshan and Tadong group.Gondwana Research,26(1): 402-413

Wang HZ.1981.Geotectonic units of China from the viewpoint of Mobilism.Journal of Earth Science,25(1): 42-66 (in Chinese with English abstract)

Wang Q and Liu XY.1986.Paleoplate tectonics between Cathaysia and Angaraland in Inner Mongolia of China.Tectonics,5(7): 1073-1088

Wang Q,Liu XY and Li JY.1991.Paleoplate tectonics in Nei Monggol of China.Bulletin of the Chinese Academy of Geological Sciences,22(1): 1-15 (in Chinese with English abstract)

Wang Y,Fan ZY,Fang S and Li BY.1999.Geological information were discovered and their plate tectonic significance on the northern bank of Xar Moron River.Geology of Inner Mongolia,(1): 6-28 (in Chinese with English abstract)

Wang YJ and Fan ZY.1997.Discovery of Permian radiolarians in ophiolite belt on northern side of Xar Moron River,Inner Mongolia and its geological significance.Acta Paleontologica Sinica,36(1): 58-69 (in Chinese with English abstract)

Wiedenbeck M,Allé P,Corfu F,Griffin WL,Meier M,Oberli F,Vonquadt A,Roddick JC and Speigel W.1995.Three natural zircon standards for U-Th-Pb,Lu-Hf,trace-element and REE analyses.Geostandards Newsletter,19(1): 1-23

Windley BF,Alexeiev D,Xiao WJ,Kroner A and Badarch G.2007.Tectonic models for accretion of the Central Asian Orogenic Belt.Journal of the Geological Society of London,164(1): 31-47

Wu FY,Zhao GC,Sun DY,Wilde SA and Yang JH.2007.The Hulan Group: Its role in the evolution of the Central Asian Orogenic Belt of NE China.Journal of Asian Earth Sciences,30(3-4): 542-556

Xiao WJ,Windley BF,Hao J and Zhai MG.2003.Accretion leading to collision and the Permian Solonker suture,Inner Mongolia,China: Termination of the Central Asian Orogenic Belt.Tectonics,22(6),doi: 10.1029/2002TC001484

Xiao WJ,Windley BF,Huang BC,Han CM,Yuan C,Chen HL,Sun M,Sun S and Li JL.2009.End-Permian to Mid-Triassic termination of the accretionary processes of the southern Altaids: Implications for the geodynamic evolution,Phanerozoic continental growth,and metallogeny of Central Asia.International Journal of Earth Science,98(6): 1189-1217

Xu B and Chen B.1993.The opposite subduction and collision between the Siberian and Sino-Korean plates during the Early-Middle Paleozoic.Report No.4 of the IGCP Project 283: Geodynamic Evolution of Paleoasian Ocean,Novosibirsk,USSR,148-150

Xu B and Chen B.1997.Framework and evolution of the Middle Paleozoic orogenic belt between Siberian and North China plates in northern Inner Mongolia.Science in China (Series D),40(5): 463-469

Xu B,Charvet J,Chen Y,Zhao P and Shi GZ.2013.Middle Paleozoic convergent orogenic belts in western Inner Mongolia (China): Framework,kinematics,geochronology and implications for tectonic evolution of the Central Asian Orogenic Belt.Gondwana Research,23(4): 1342-1364

Zeng JJ.2009.Geological characteristics and significance of Late Paleozoic adakitic granitic rocks at Guyuan area,Inner Mongolia.Master Degree Thesis.Beijing: China University of Geosciences (in Chinese)

Zhang SH,Zhao Y,Song B,Yang ZY,Hu JM and Wu H.2007.Carboniferous granitic plutons from the northern margin of the North China block: Implications for a Late Palaeozoic active continental margin.Journal of the Geological Society,London,164(2): 451-463

Zhang SH,Zhao Y,Song B,Hu JM,Liu SW,Yang YH,Chen FK,Liu XM and Liu J.2009.Contrasting Late Carboniferous and Late Permian-Middle Triassic intrusive suites from the northern margin of the North China craton: Geochronology,petrogenesis,and tectonic implications.Geological Society of America Bulletin,121(1-2): 181-200

Zhang W and Jian P.2008.SHRIMP dating of Early Paleozoic granites from North Damaoqi,Inner Mongolia.Acta Geologica Sinica,82(6): 778-787 (in Chinese with English abstract)

Zhang W,Jian P,Kr?er A and Shi YR.2012.Magmatic and metamorphic development of an Early to Mid-Paleozoic continental margin arc in the southernmost Central Asian Orogenic Belt,Inner Mongolia,China.Journal of Asian Earth Sciences,72: 63-74

Zhang XH and Zhai MG.2010.Magmatism and its metallogenetic effects during the Paleozoic continental crustal construction in northern North China: An overview.Acta Petrologica Sinica,26(5): 1329-1341 (in Chinese with English abstract)

Zhao CJ,Peng YJ,Dang ZX and Zhang YP.1996.Tectonic Framework and Crust Evolution of Eastern Jilin and Heilongjiang Provinces.Shenyang: Liaoning University Press,1-186 (in Chinese)

附中文參考文獻

曹從周.1987.中國東北部的板塊構(gòu)造格局.中國地質(zhì)科學(xué)院沈陽地質(zhì)礦產(chǎn)研究所所刊,16: 60-67

鄧勝徽,萬傳彪,楊建國.2009.黑龍江阿城晚二疊世安加拉-華夏混生植物群——兼述古亞洲洋的關(guān)閉問題.中國科學(xué)(D輯),39(12): 1744-1752

樊志勇.1996.內(nèi)蒙古西拉木倫河北岸杏樹洼一帶石炭紀(jì)洋殼“殘片”的發(fā)現(xiàn)及其構(gòu)造意義.中國區(qū)域地質(zhì),(4): 382

葛夢春,周文孝,于洋,孫俊俊,鮑建泉,王世海.2011.內(nèi)蒙古錫林郭勒雜巖解體及表殼巖系年代確定.地學(xué)前緣,18(5): 182-195

郭鋒,范蔚茗,李超文,苗來成,趙亮.2009.早古生代古亞洲洋俯沖作用: 來自內(nèi)蒙古大石寨玄武巖的年代學(xué)與地球化學(xué)證據(jù).中國科學(xué)(D輯),39(5): 569-579

郭勝哲.1986.中朝板塊與西伯利亞板塊拼合時限的確定及其生物地層學(xué)依據(jù).中國地質(zhì)科學(xué)院沈陽地質(zhì)礦產(chǎn)研究所所刊,14: 127-136

韓國卿,劉永江,溫泉波,李偉,吳琳娜,趙英利,丁凌,趙立敏,梁琛岳.2011.西拉木倫河縫合帶北側(cè)二疊紀(jì)砂巖碎屑鋯石LA-ICP-MS U-Pb年代學(xué)及其構(gòu)造意義.地球科學(xué),36(4): 687-702

何國琦,邵濟安.1983.內(nèi)蒙古東南部(昭盟)西拉木倫河一帶早古生代蛇綠巖建造的確認及其大地構(gòu)造意義.見: 唐克東主編.中國北方板塊構(gòu)造文集(1).北京: 地質(zhì)出版社,243-250

和政軍,劉淑文,任紀(jì)舜,王瑜.1997.內(nèi)蒙古林西地區(qū)晚二疊世-早三疊世沉積演化及構(gòu)造背景.中國區(qū)域地質(zhì),16(4): 403-409,427

黃汲清,任紀(jì)舜,姜春發(fā)等.1977.中國大地構(gòu)造基本輪廓.地質(zhì)學(xué)報,51(2): 117-135

黃汲清,任紀(jì)舜,姜春發(fā)等.1980.中國大地構(gòu)造及其演化(1:400萬中國大地構(gòu)造圖簡要說明).北京: 科學(xué)出版社

李春昱,王荃,劉雪亞,湯耀慶.1982.亞洲大地構(gòu)造圖(1: 8000000)及其說明書.北京: 中國地圖出版社

李錦軼.1986.林西一帶枕狀基性熔巖的基本特征及其大地構(gòu)造意義.中國地質(zhì)科學(xué)院沈陽地質(zhì)研究所所刊,14: 65-74

李錦軼.1987.內(nèi)蒙古東部西拉木倫河北側(cè)早古生代蛇綠巖的基本特征及其構(gòu)造意義.見: 沈陽地質(zhì)礦產(chǎn)研究所主編.中國北方板塊構(gòu)造論文集(2).北京: 地質(zhì)出版社,136-150

李錦軼,高立明,孫桂華,李亞萍,王彥斌.2007.內(nèi)蒙古東部雙井子中三疊世同碰撞殼源花崗巖的確定及其對西伯利亞與中朝板塊碰撞時限的約束.巖石學(xué)報,23(3): 565-582

李朋武,高銳,管燁,李秋生.2007.華北與西伯利亞地塊碰撞時代的古地磁分析——兼論蘇魯-大別超高壓變質(zhì)作用的構(gòu)造起因.地球?qū)W報,28(3): 234-252

李益龍,周漢文,鐘增球,張雄華,廖群安,葛夢春.2009.華北與西伯利亞板塊的對接過程: 來自西拉木倫縫合帶變形花崗巖鋯石LA-ICP-MS U-Pb年齡證據(jù).地球科學(xué),34(6): 931-938

劉敦一,簡平,張旗,張福勤,石玉若,施光海,張履橋,陶華.2003.內(nèi)蒙古圖林凱蛇綠巖中埃達克巖SHRIMP測年: 早古生代洋殼消減的證據(jù).地質(zhì)學(xué)報,77(3): 317-330

劉建峰,李錦軼,遲效國,馮乾文,胡兆初,周坤.2013.華北克拉通北緣與弧-陸碰撞相關(guān)的早泥盆世長英質(zhì)火山巖——鋯石U-Pb定年及地球化學(xué)證據(jù).地質(zhì)通報,32(2-3): 267-278

內(nèi)蒙古自治區(qū)地質(zhì)礦產(chǎn)局.1991.內(nèi)蒙古自治區(qū)區(qū)域地質(zhì)志.北京: 地質(zhì)出版社,1-725

秦亞,梁一鴻,邢濟麟,張青偉,劉城先.2013.內(nèi)蒙古正鑲白旗地區(qū)早古生代O型埃達克巖的厘定及其意義.地學(xué)前緣,20(5): 106-114

任紀(jì)舜,姜春發(fā),張正坤,秦德余.1980.中國大地構(gòu)造及其演化——1:400萬中國大地構(gòu)造圖簡要說明.北京: 科學(xué)出版社,89-104

尚慶華.2004.北方造山帶內(nèi)蒙古中-東部地區(qū)二疊紀(jì)放射蟲的發(fā)現(xiàn)及意義.科學(xué)通報,49(24): 2574-2579

邵濟安.1986.內(nèi)蒙古中部早古生代蛇綠巖及其在恢復(fù)地殼演化歷史中的意義.中國北方板塊構(gòu)造論文集.北京: 地質(zhì)出版社,(1): 158-172

邵濟安.1991.中朝板塊北緣中段的地殼演化.北京: 北京大學(xué)出版社,1-136

石玉若,劉敦一,張旗,簡平,張福勤,苗來成,施光海,張履橋,陶華.2005.內(nèi)蒙古蘇左旗白音寶力道Adakite質(zhì)巖類成因探討及其SHRIMP年代學(xué)研究.巖石學(xué)報,21(1): 143-150

宋彪,張玉海,萬渝生,簡平.2002.鋯石SHRIMP樣品靶制作、年齡測定及有關(guān)現(xiàn)象討論.地質(zhì)論評,48(增刊): 26-30

孫德有,吳福元,張艷斌,高山.2004.西拉木倫河-長春-延吉板塊縫合帶的最后閉合時間——來自吉林大玉山花崗巖體的證據(jù).吉林大學(xué)學(xué)報(地球科學(xué)版),34(2): 174-180

孫立新,任邦方,趙鳳清,谷永昌,李艷峰,劉卉.2013.內(nèi)蒙古錫林浩特地塊中元古代花崗片麻巖的鋯石U-Pb年齡和Hf同位素特征.地質(zhì)通報,32(2-3): 327-340

唐克東.1992.中朝板塊北側(cè)褶皺帶構(gòu)造演化及成礦規(guī)律.北京: 北京大學(xué)出版社,1-277

王鴻禎.1981.從活動輪觀點討論中國大地構(gòu)造分區(qū).地球科學(xué),25(1): 42-66

王荃,劉雪亞,李錦軼.1991.中國內(nèi)蒙古中部的古板塊構(gòu)造.中國地質(zhì)科學(xué)院院報,22(1): 1-15

王友,樊志勇,方曙,李泊洋.1999.西拉木倫河北岸新發(fā)現(xiàn)地質(zhì)資料及其構(gòu)造意義.內(nèi)蒙古地質(zhì),(1): 6-28

王玉凈,樊志勇.1997.內(nèi)蒙古西拉木倫河北部蛇綠巖帶中二疊紀(jì)放射蟲的發(fā)現(xiàn)及其地質(zhì)意義.古生物學(xué)報,36(1): 58-69

徐備,陳斌.1997.內(nèi)蒙古北部華北板塊與西伯利亞板塊之間早古生代造山帶的結(jié)構(gòu)及演化.中國科學(xué)(D輯),27(3): 227-232

曾俊杰.2009.內(nèi)蒙古固陽地區(qū)晚古生代埃達克質(zhì)花崗巖特征及其地質(zhì)意義.碩士學(xué)位論文.北京: 中國地質(zhì)大學(xué)

張維,簡平.2008.內(nèi)蒙古達茂旗北部早古生代花崗巖類SHRIMP U-Pb年代學(xué).地質(zhì)學(xué)報,82(6): 778-787

張曉輝,翟明國.2010.華北北部古生代大陸地殼增生過程中的巖漿作用與成礦效應(yīng).巖石學(xué)報,26(5): 1329-1341

趙春荊,彭玉鯨,黨增欣,張允平.1996.吉黑東部構(gòu)造格架及地殼演化.沈陽: 遼寧大學(xué)出版社,1-186