李　冰,張耀玲,王超群,胡道功

北祁連縫合帶油葫蘆溝玄武巖地球化學(xué)特征

李冰1,2,張耀玲1,王超群1,胡道功1

(1.中國(guó)地質(zhì)科學(xué)院地質(zhì)力學(xué)研究所,北京100081；2.中國(guó)地質(zhì)科學(xué)院,北京100037)

對(duì)油葫蘆溝蛇綠巖中玄武巖進(jìn)行了地球化學(xué)研究,以探討其形成環(huán)境。油葫蘆溝蛇綠巖中玄武巖的主量和微量元素具有低鉀富鈉的特征,屬低鉀 (拉斑)系列。玄武巖的球粒隕石標(biāo)準(zhǔn)化稀土元素分配模式圖表現(xiàn)為近平坦型,輕重稀土富集不明顯,屬于虧損地幔 (N型)。大離子親石元素 (LILE)Rb、K和Sr出現(xiàn)負(fù)異常,高場(chǎng)強(qiáng)元素 (HFSE)Nb、Ta、Hf、Zr無(wú)負(fù)異常,表現(xiàn)出大洋中脊幔源巖漿作用的特征。構(gòu)造環(huán)境判別圖顯示,油葫蘆溝玄武巖屬于典型的虧損型大洋中脊玄武巖 (MORB)。研究結(jié)果表明油葫蘆溝蛇綠巖中玄武巖為北祁連洋洋殼的組成部分,北祁連洋在晚元古代—晚寒武世為典型的大洋中脊環(huán)境。

北祁連縫合帶;油葫蘆溝;玄武巖;地球化學(xué);洋中脊

北祁連縫合帶呈北西向分布于中祁連陸塊和阿拉善陸塊之間,西端被阿爾金斷裂切割,向東與秦嶺造山帶相聯(lián)接,縫合帶內(nèi)主要地層為寒武—奧陶系,并發(fā)育多條蛇綠混雜巖帶[1～3]。北祁連蛇綠巖帶作為中國(guó)最早發(fā)現(xiàn)的蛇綠巖之一,研究程度較高[4～6]。蛇綠巖體主要沿南北兩條帶分布,南帶沿熬油溝、玉石溝、油葫蘆溝、東草河、達(dá)坂山到永登一帶展布；北帶沿甘肅九個(gè)泉、大岔大阪、扁都口至老虎山一線,全長(zhǎng)超過(guò)1000 km。前人對(duì)北祁連蛇綠巖的地球化學(xué)特征做了不同程度的研究工作,但對(duì)于其形成環(huán)境為大洋中脊[7～10]還是弧后盆地[11～12]仍存在爭(zhēng)議。本文對(duì)油葫蘆溝蛇綠巖中玄武巖進(jìn)行了地球化學(xué)研究,以探討其形成環(huán)境。

1　地質(zhì)概況及油葫蘆溝玄武巖特征

北祁連加里東造山帶[11,13～14]主體經(jīng)托萊山、大通北山、達(dá)坂山、白銀、隴縣等地與商丹縫合帶相連,大致以中祁連北緣深斷裂為主斷裂。主斷裂帶西起托萊河谷,東經(jīng)托萊南山、達(dá)坂山南坡入甘肅境內(nèi),呈北西—北西西向延伸,構(gòu)成中祁連陸塊與北祁連縫合帶的分界線。油葫蘆溝蛇綠巖出露于祁連縣西約50 km(見(jiàn)圖1),位于北祁連蛇綠巖帶南帶西段,北祁連加里東期俯沖增生楔的淺部單元內(nèi)[15]?？p合帶內(nèi)地層主要為早奧陶世陰溝群、中寒武世黑刺溝組及長(zhǎng)城系朱龍關(guān)群。

圖1　北祁連主要蛇綠巖帶分布及年齡圖(據(jù)文獻(xiàn)[16]修編)Fig.1　Geological map of the North Qilian Orogen with localities of major ophiolite suites and their ages

油葫蘆溝蛇綠巖主要由灰綠色玄武巖組成,劈理發(fā)育 (見(jiàn)圖2)。鏡下觀察表明,巖石由斑晶和基質(zhì)組成,具少斑狀結(jié)構(gòu) (見(jiàn)圖3),基質(zhì)似交織結(jié)構(gòu),塊狀構(gòu)造,少量杏仁狀構(gòu)造。斑晶為斜長(zhǎng)石 (<1%)和輝石 (<1%)；基質(zhì)為斜長(zhǎng)石 (55%～70%)、輝石 (25%～40%)和隱晶質(zhì) (<5%)。本文沿油葫蘆溝 (N 38°13′57.72″,E 99°46′10.48″)采取5個(gè)玄武巖樣品 (B063-1—B063-4,B063-6)進(jìn)行地球化學(xué)分析。

圖2　玄武巖巖石特征Fig.2　photography of basalts

圖3　玄武巖顯微結(jié)構(gòu)Fig.3　Microstructure of basalt samples

2　玄武巖的巖石地球化學(xué)特征

玄武巖樣品的主量和微量元素分析均在國(guó)家地質(zhì)實(shí)驗(yàn)測(cè)試中心完成,結(jié)果見(jiàn)表1、表2。

表1 油葫蘆溝玄武巖主量元素分析結(jié)果Table 1 Major elements of basalts in Youhulugou area　%

表2 油葫蘆溝玄武巖微量元素分析結(jié)果Table 2 Trace elements of basalts in Youhulugou area　μg/g

2.1主量元素地球化學(xué)特征

由表1可見(jiàn),玄武巖中K2O+Na2O在3.79%～4.75%,Na2O含量 (3.75%～4.63%)大于K2O含量 (0.02%～0.14%),具有相對(duì)低鉀富鈉的特征；且K2O/Na2O比值為0.01～0.03,屬于低堿性火山巖系列。在TAS分類圖解 (見(jiàn)圖4a)中,樣品落入玄武巖及玄武安山巖區(qū)；在K2O-SiO2圖解 (見(jiàn)圖4b)上,玄武巖屬于低鉀拉斑系列。

在Zr/Y-Zr構(gòu)造環(huán)境判別圖 (見(jiàn)圖5a)中,樣品落入洋中脊玄武巖 (MORB)區(qū),部分與島弧玄武巖 (IAB)區(qū)重疊；TiO2-Zr分類圖 (見(jiàn)圖5b)中,樣品落入洋中脊玄武巖(MORB)、島弧玄武巖 (IAB)和板內(nèi)玄武巖 (WPB)的重疊區(qū)域。在P2O5-TiO2(見(jiàn)圖5c)和Th/Yb-Ta/Yb(見(jiàn)圖5d)構(gòu)造環(huán)境判別圖解中,5個(gè)玄武巖樣品全部落入大洋中脊玄武巖 (MORB)區(qū)域。

2.2稀土和微量元素地球化學(xué)特征

由表2可知,玄武巖稀土元素總量 (ΣREE)為81.49～94.89 μg/g,平均值87.16 μg/g；輕稀土總量 (ΣLREE)為24.53～39.43 μg/g,平均30.48 μg/g,重稀土含量 (ΣHREE) 54.10～60.67 μg/g,平均56.68 μg/g。ΣLREE/ΣHREE值為0.42～0.71,平均0.54,顯示二者無(wú)明顯分異。Δ(Eu)值為0.77～0.97,平均0.91；δ(Ce)值為0.98～1.03,平均1.00；(La/Yb)N值0.63～1.26,平均0.86；(La/Sm)N值為0.69～1.20,平均0.86,小于1。在球粒隕石標(biāo)準(zhǔn)化稀土元素分配模式圖 (見(jiàn)圖6a)上,樣品的稀土元素配分模式為平坦到略虧損型,屬典型的虧損型大洋中脊玄武巖 (N-MORB)的稀土元素分布模式。微量元素原始地幔標(biāo)準(zhǔn)化圖解 (見(jiàn)圖6b)顯示,玄武巖從強(qiáng)不相容元素到弱不相容元素同樣表現(xiàn)向左傾斜的特征。大離子親石元素 (LILE)Rb、K和Sr出現(xiàn)負(fù)異常,高場(chǎng)強(qiáng)元素 (HFSE)Nb、Ta、Ti元素?zé)o負(fù)異常,排除了玄武巖形成于島弧環(huán)境的可能性?？傮w表現(xiàn)出大洋中脊幔源巖漿作用的特征,進(jìn)一步表明該玄武巖形成于大洋中脊構(gòu)造環(huán)境。

圖4　油葫蘆溝地區(qū)玄武巖巖性判別圖Fig.4　Discrimination diagrams of basalt in Youhulugou area

圖5　油葫蘆溝地區(qū)玄武巖類構(gòu)造環(huán)境判別圖Fig.5　Tectonic environment discrimination diagrams of basalts from Youhulugou area

圖6　北祁連油葫蘆溝玄武巖類稀土元素球粒隕石標(biāo)準(zhǔn)化配分模式圖和微量元素原始地幔標(biāo)準(zhǔn)化多元素蛛網(wǎng)圖 (原圖據(jù)文獻(xiàn) [27～28])Fig.6　Chondrite-normalized REE distribution patterns and primitive mantle-normalized trace element spider diagram of volcanic rocks in Youhulugou of North Qilian Orogen

3　討論與結(jié)論

3.1油葫蘆溝蛇綠巖形成的構(gòu)造環(huán)境

蛇綠巖被認(rèn)為是洋中脊擴(kuò)張或板塊俯沖消減過(guò)程的產(chǎn)物[29～30],玄武巖是蛇綠巖巖石組合中最為常見(jiàn)的一類,因此蛇綠巖內(nèi)玄武巖可為蛇綠巖的形成環(huán)境提供直接證據(jù)。地球化學(xué)研究表明,油葫蘆溝蛇綠巖中玄武巖低鉀富鈉,屬于低鉀 (拉斑)系列；構(gòu)造環(huán)境判別圖顯示,玄武巖屬于典型的虧損型大洋中脊玄武巖 (N-MORB)；稀土和微量元素分析結(jié)果顯示,巖漿具有明顯的大洋中脊幔源巖漿作用的特征,均表明油葫蘆溝蛇綠巖形成于大洋中脊的構(gòu)造環(huán)境。

3.2北祁連洋早古生代構(gòu)造演化

北祁連造山帶的形成與演化經(jīng)歷了復(fù)雜的過(guò)程,華北地塊與柴達(dá)木地塊間的洋盆經(jīng)歷了陸緣拉張、形成大洋到閉合造山的過(guò)程[5～6,9,13,31]。研究表明,北祁連南部蛇綠巖帶在晚元古代到晚寒武世 (距今550～497 Ma)發(fā)育洋盆[7,10,32],處于洋脊擴(kuò)張、洋殼生長(zhǎng)階段,油葫蘆溝蛇綠巖即為此階段形成；北部蛇綠巖帶在早—中奧陶世 (距今490～448.5 Ma)處于弧后盆地或火山弧構(gòu)造環(huán)境,說(shuō)明北祁連洋在該時(shí)代處于島弧火山作用階段,洋殼向北俯沖并形成島弧及弧后盆地[12,16]。北祁連洋向北俯沖的俯沖雜巖帶高壓變質(zhì)榴輝巖年齡為463～468 Ma,反映出俯沖作用及其引發(fā)的島弧火山活動(dòng)主要發(fā)生在中奧陶世[33]。晚奧陶世—志留紀(jì),陸源碎屑巖沉積的出現(xiàn),標(biāo)志著北祁連洋洋盆已趨于閉合階段[34]。至此,從晚元古代到志留紀(jì),北祁連洋經(jīng)歷了大陸裂解、洋盆擴(kuò)張、俯沖消減到洋盆閉合的全過(guò)程,進(jìn)入碰撞造山階段。

[1] 馮益民.祁連造山帶研究概況——?dú)v史、現(xiàn)狀及展望 [J].地球科學(xué)進(jìn)展,1997,12:307～314.

FENG Yi-min.Investigatory summary of the Qilian orogenic belt,China:History,Presence and Prospect[J].Advance in Earth Sciences,12:307～314.

[2] 杜遠(yuǎn)生,朱杰,韓欣,等.從弧后盆地到前陸盆地——北祁連造山帶奧陶紀(jì)—泥盆紀(jì)的沉積盆地與構(gòu)造演化[J].地質(zhì)通報(bào),2004,23(9/10):911～917.

DU Yuan-sheng,ZHU Jie,HAN Xin,et al.From the back-arc basin to foreland basion—Ordovician-Devonian sedimentary basin and tectonic evolution in the North Qilian orogenic belt[J].Geological Bulletin of China,2004,23(9/10):911～917.

[3] Song S G,Niu Y,Zhang L F,et al.Tectonic evolution of Early Paleozoic HP metamorphic rocks in the North Qilian Mountains,NW China:New perspectives[J].Journal of Asian Earth Science,2009,35:334～353.

[4] 肖序常,陳國(guó)銘,朱志直.祁連山古板塊構(gòu)造的一些認(rèn)識(shí) [J].地質(zhì)科技,1974,3:73～78.

XIAO Xu-chang,CHEN Guo-ming,ZHU Zhi-zhi.Some knowledge about the paleo-plate tectonics of the Qilian Mountains [J].Geological Seience and Technology,1974,3:73～78.

[5] 王荃,劉雪亞.我國(guó)西部祁連山區(qū)的古海洋地殼及其大地構(gòu)造意義 [J].地質(zhì)科學(xué),1976,1:42～55.

WANG Quan,LIU Xue-ya.The ancient oceanic crust and its tectonic implications,North Qilian Mountains,China[J]. Scienta Geologica Sinica,1976,1:42～55.

[6] 肖序常,陳國(guó)銘,朱志直.祁連山古蛇綠巖的地質(zhì)構(gòu)造意義 [J].地質(zhì)學(xué)報(bào),1978,54(4):281～295.

XIAO Xu-chang,CHEN Guo-ming,ZHU Zhi-zhi.A preliminary study on the tectonics ancient ophiolites in the Qilian Mountain,northwest China[J].Acta Geologica Sinica,1978,54(4):281～295.

[7] 曾建元,楊懷仁,楊宏儀,等.北祁連東草河蛇綠巖:一個(gè)早古生代的洋殼殘片 [J].科學(xué)通報(bào),2007,52 (7):825～835.

ZENG Jian-Yuan,YANG Huai-ren,YANG Hong-yi,et al.The Dongcaohe ophiolite from the North Qilian Mountains:A fossil oceanic crust of the Paleo-Qilian ocean[J].Chinese Science Bulletin,2007,52(17):2390～2401.

[8] 馮益民,何世平,閻軍.北祁連山中段早中奧陶世蛇綠巖中席狀巖墻雜巖的發(fā)現(xiàn)及其地質(zhì)意義 [J].地質(zhì)論評(píng), 1994,40(3):252～265.

FENG Yi-min,HE Shi-ping,YAN Jun.The discovery and geological significance of sheeted dyke complex in the earlymiddle Ordovician ophiolite in the central section of the north Qilian Mountains,China[J].Geological Review,1994,40 (3):252～265.

[9] 夏林圻,夏祖春,徐學(xué)義.北祁連山早古生代洋脊-洋島和弧后盆地火山作用 [J].地質(zhì)學(xué)報(bào),1998,72(4): 301～312.

XIA Lin-qi,XIA Zu-chun,XU Xue-yi.Early palaeozoic mid-ocean ridge-ocean island and back arc basin volcanism in the north Qilian mountains[J].Acta Geological Sinica,1998,72(4):301～312.

[10] 侯青葉,趙志丹,張宏飛,等.北祁連玉石溝蛇綠巖印度洋MORB型同位素組成特征及其地質(zhì)意義 [J].中國(guó)科學(xué)D輯:地球科學(xué),2005,35(8):710～719.

HOU Qing-ye,ZHAO Zhi-dan,ZHANG Hong-fei,et al.Indian Ocean-MORB-type isotopic signature of Yushigou Ophiolite in north Qilian Mountains and its implications[J].Science in China Series D:Earth Science,2006,78(5):561～572.

[11] 張旗,孫曉猛,周德進(jìn),等.北祁連蛇綠巖的特征、形成環(huán)境及其構(gòu)造意義 [J].地球科學(xué)進(jìn)展,1997,12: 366～393.

ZHANG Qi,SU Xiao-meng,ZHOU De-jin,et al.The characteristics of North Qilian ophiolites,forming settings and their tectonic significance[J].Advance in Earth Sciences,1997,12:366～393.

[12] 夏小洪,宋述光.北祁連山肅南九個(gè)泉蛇綠巖形成年齡和構(gòu)造環(huán)境 [J].科學(xué)通報(bào),2010,55(15):1465～1473.

XIA Xiao-hong,SONG Shu-guang.Forming age and tectono-petrogenises of the Jiugequan ophiolite in the North Qilian Mountain,NW China[J].Chinese Science Bulletin,2010,55(15):1465～1473.

[13] 許志琴,徐惠芬,張建新,等.北祁連走廊南山加里東俯沖雜巖增生地體及其動(dòng)力學(xué) [J].地質(zhì)學(xué)報(bào),1994,68(1):1～15.

XU Zhi-qin,XU Hui-fen,ZHANG Jian-xin,et al.The Zoulang Nanshan Caledonian subductive complex in the Northern Qilian Mountains and its dynamics[J].Acta Geological Sinica,1994,68:1～15.

[14] Xia L Q,Xia Z H,Xu X Y.Magmagenesis in the Ordovician backarc basins of the Northern Qilian Mountains,China[J]. Geology Society of America Bulletin,2003,115:1510～1522.

[15] 張建新,許志琴,徐惠芬,等.北祁連加里東期俯沖-增生楔結(jié)構(gòu)及動(dòng)力學(xué) [J].地質(zhì)科學(xué),1998,33(3):290～299.

ZHANG Jian-xin,Xu Zhi-qin,XU Hui-fen,et al.Frame work of north Qilian Caledonian subduction-accretionary wedge and its deformation dynamics[J].Scientia Geologica Sinica,1998,33(3):290～299.

[16] Song Shuguang,Niu Yaoling,Su Li,et al.Tectonics of the North Qilian orogen,NW China[J].Gondwana Research, 2013,23:1378～1401.

[17] 陸松年,于海峰,李懷坤,等.“中央造山帶”早古生代縫合帶及其構(gòu)造分區(qū)概述 [J].地質(zhì)通報(bào),2006,25 (12):1368～1379.

LU Song-nian,YU Hai-feng,LI Huai-kun,et al.Early Paleozoic suture zones and tectonic divisions in the“Central China Orogen”[J].Geological Bulletin of China,2006,25(12):1368～1380.

[18] 相振群,陸松年,李懷坤,等.北祁連西段熬油溝輝長(zhǎng)巖的鋯石SHRIMP U-Pb年齡及地質(zhì)意義 [J].地質(zhì)通報(bào), 2007,26(12):1686～1691.

XIANG Zhen-qun,LU Song-nian,LI Huai-kun,et al.SHRIMP U-Pb zircon age of gabbro in Aoyougou in the western segment of the North Qilian Mountains,China and its geological implications[J].Geological Bulletin of China,2007,26 (12):1686～1691.

[19] 夏小洪,孫楠,宋述光,等.北祁連西段熬油溝—二只哈拉達(dá)坂蛇綠巖的形成環(huán)境和時(shí)代 [J].北京大學(xué)學(xué)報(bào):自然科學(xué)版,2012,48(5):757～769.

XIA Xiao-hong,SUN Nan,SONG Shu-guang,et al.Age and tectonic setting of the Aoyougou-Erzhihaladaban ophiolite in the western North Qilian Mountains,NW China[J].Acta Scientiarum Naturalium Universitatis Pekinensis,2012,48 (5):757～769.

[20] 史仁燈,楊經(jīng)綏,吳才來(lái),等.北祁連玉石溝蛇綠巖形成于晚震旦世的SHRIMP年齡證據(jù) [J].地質(zhì)學(xué)報(bào), 2004,78(5):649～657.

SHI Ren-deng,YANG Jing-sui,WU Cai-lai,et al.First SHRIMP dating for the formation of the late Sinian Yushigou ophiolite,North Qilian Mountains[J].Acta Geological Sinica,2004,78(5):649～657.

[21] Le Maitre R W.A Classification of Igneous Rocks and Glossary of Terms[M].Oxford:Blackwell,1989:193.

[22] Peccerillo R,Taylor S R.Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area,Northern Turkey [J].Contributions to Mineralogy and Petrology,1976,58(1):63～81.

[23] Middlemost E A K.Magmas and Magmatic Rocks[M].London:Longman,1985:1～266.

[24] Pearce J A,Norry M J.Petrogenetic implications of Ti,Zr,Y,and Nb variations in volcanic rocks[J].Contributions to Mineralogy and Petrology,1979,69(1):33～47.

[25] Pearce J A.Trace element characteristics of lavas from destructive plate boundaries[C]//Thorpe R S.Andesie. Chichester:Wiley,1982:525～548.

[26] Pearce J A.Statistical analysis of major element patterns in basalts[J].Journal of Petrology,1976,17(1):15～43.

[27] Boynton W V.Cosmochemistry of the rare earth elements:Meteorite Studies[J].Developement in Geochemistry,1984, 2:63～114.

[28] Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[C]//Saunders A D,Norry M J.Magmatism in the ocean basins.Oxford:Blackwell,1989:313～346.

[29] Leitch E C.Island arc elements and arc-related ophiolites[J].Tectonophysics,1984,106(3/4):177～203.

[30] Pearce J A,Lippard S J,Roberts S.Characteristics and tectonic significance of supra-subduction zone ophiolites[J]. Special Publications of Geological Society of London,1984,16(1):74～94.

[31] 左國(guó)朝,劉寄陳.北祁連早古生代大地構(gòu)造演化 [J].地質(zhì)科學(xué),1987,(1):14～24.

ZUO Guo-chao,LIU Ji-chen.Early-Paleozoic tectonic evolution of the North Qilian[J].Scientia Geologica Sinaca,1987,(1):14～24.

[32] 張招崇,毛景文,楊建民,等.北祁連熬油溝蛇綠巖巖石成因的地球化學(xué)證據(jù) [J].地質(zhì)學(xué)報(bào),1998,72(1): 42～51.

ZHANG Zhao-chong,MAO Jing-wen,YANG Jian-min,et al.Geochemical evidences on the petrogenesis of the Aoyougou ophiolite in north Qilian Mountains[J].Acta Geological Sinica,1998,72(1):42～51.

[33] 宋述光,張立飛,Niu Y L,等.北祁連山榴輝巖鋯石SHRIMP定年及其構(gòu)造意義 [J].科學(xué)通報(bào),2004,49 (6):592～595.

SONG Su-guang,ZHANG Li-fei,Niu Y L,et al.Zircon U-Pb SHRIMP ages of eclogites from the North Qilian Mountains, NW China and their tectonic implication[J].Chinese Science Bulletin,2004,49(6):592～595.

[34] 夏林圻,夏祖春,徐學(xué)義.北祁連構(gòu)造-火山巖漿演化動(dòng)力學(xué) [J].西北地質(zhì)科學(xué),1995,16(1):1～28.

XIA Lin-qi,XIA Zu-chun,XU Xue-yi.Dynamics of tectono-volcano-magmatic evolution form North Qilian Mountains, China[J].Northwest Geoscience,1995,16(1):1～28.

GEOCHEMICAL CHARACTERISTICS OF THE YOUHULUGOU BASALTS IN THE SUTURE ZONE OF THE NORTH QILIAN MOUNTAIN

LI Bing1,2,ZHANG Yao-ling1,WANG Chao-qun1,HU Dao-gong1
(1.Institute of Geomechanics,Chinese Academy of Geological Science,Beijing 100081,China；2.Chinese Academy of Geological Science,Beijing 100037,China)

Geochemical study for the basalt of Youhulugou ophiolite was carried out and discussed its genesis environment.Major and trace element in basalt is one of the representative ophiolite fragments in the suture zone of the North Qilian Mountain.In this study,geochemical study and indicates that the basalts from the Youhulugou ophiolite have N-MORB type characteristics.And according to the REE distribution patterns with no anomaly,the basalts are also similar to mid-ocean ridge basalt.Meanwhile,these basalts are generally depleted in large ion lithophile elements (LILE)of Rb、K and Sr,and high field strength elements(HFSE)are normal,indicating the characteristicsofmantle-derivedmagmafrommidoceanicridge.Tectonicenvironment discrimination diagrams also suggest that these basalts are typical mid oceanic ridge basalts (MORB).Combined with regional geological characters and geochemical data,we conclude that the Youhulugou basalts represents a part of the dismembered North Qianlian oceanic crust of the era. And the tectonic setting of the North Qilian Ocean was mid-ocean ridge during the late Proterozoic to late Cambrian.

North Qilian suture zone；Youhulugou basalts；geochemical characteristics；MOR

P632

A

1006-6616(2016)01-0048-08

2015-09-15

中國(guó)地質(zhì)科學(xué)院基本科研業(yè)務(wù)費(fèi)專項(xiàng)項(xiàng)目 (YYWF201401)；中國(guó)地質(zhì)調(diào)查局 “祁連山及鄰區(qū)天然氣水合物資源勘查 (控礦因素綜合研究及編圖)”項(xiàng)目 (GZHL20120301)

李冰 (1987-),男,碩士研究生,構(gòu)造地質(zhì)學(xué)專業(yè)。E-mail:libing@cags.ac.cn