准噶尔盆地东北缘中侏罗世逆冲构造变形及其地质意义
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摘要
主要依据准噶尔盆地东北缘青格里底山前冲断带二维地震剖面的精细地质解释,并结合临近阿尔泰造山带燕山期花岗岩的同位素定年,认为准噶尔盆地东北缘在中侏罗世存在逆冲构造变形.该构造变形发生于中侏罗统西山窑组(J2x)沉积期,形成了走向北西、倾向北东的逆断层及断层传播褶皱,表明其时准噶尔盆地东北缘曾受到来自于北东方向的挤压应力作用,其力源可能和西伯利亚板块与蒙古-华北板块的碰撞、拼贴事件有关,是蒙古-鄂霍次克洋闭合的陆内反映.这对于促进北疆地区构造变形与盆山关系的研究具有重要意义.
Based on the 2D seismic profile interpretation in the thrust belt at the front of Qinggelidi Mountain in northeastern Junggar Basin and combined with isotopic dating of Yanshanian granites in nearby Altay orogenic belt,it is confirmed that the thrust deformation exist in northeastern Junggar Basin in Middle Jurassic.The structural deformation started in the sedimentary period of Xishanyao Formation(J2x) in Middle Jurassic,formed the NW-SE trending and NE dipping thrust faults and fault-propagation fold,which indicate that the main force comes from the stress force of NE.It is quite possibilly caused by the collision between the Siberian plate and Mongolia-North China Plate,as a result of the Mongolia-Okhotsk ocean closure in the land area.This is important for understanding the structural deformation and orogen-basin coupling in north Xinjiang Province.
Based on the 2D seismic profile interpretation in the thrust belt at the front of Qinggelidi Mountain in northeastern Junggar Basin and combined with isotopic dating of Yanshanian granites in nearby Altay orogenic belt,it is confirmed that the thrust deformation exist in northeastern Junggar Basin in Middle Jurassic.The structural deformation started in the sedimentary period of Xishanyao Formation(J2x) in Middle Jurassic,formed the NW-SE trending and NE dipping thrust faults and fault-propagation fold,which indicate that the main force comes from the stress force of NE.It is quite possibilly caused by the collision between the Siberian plate and Mongolia-North China Plate,as a result of the Mongolia-Okhotsk ocean closure in the land area.This is important for understanding the structural deformation and orogen-basin coupling in north Xinjiang Province.
引文
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[20]郑亚东,DAVIS G A,王琮,等.燕山带中生代主要构造事件与板块构造背景问题[J].地质学报,2000,74(4):289-302.ZHENG Ya-dong,DAVIS G A,WANG Cong,et al.Major Mesozoic tectonic events in the Yanshan Beltand the Plate tectonic setting[J].Acta Geologica Sini-ca,2000,74(4):289-302.
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[2]刘和甫,汪泽成,熊保贤,等.中国中西部中、新生代前陆盆地与挤压造山带耦合分析[J].地学前缘,2000,7(3):55-72.LI U He-fu,WANG Ze-cheng,XIONG Bao-xian,etal.Coupling analysis of Mesozoic-Cenozoic forelandbasin and mountain systemin central and western Chi-na[J].Earth Science Frontiers,2000,7(3):55-72.
[3]方世虎,郭召杰,张志诚,等.准噶尔盆地中生代演化的地层学和沉积学证据[J].高校地质学报,2004,10(4):554-561.FANG Shi-hu,GUO Zhao-jie,ZHANG Zhi-cheng,etal.Mesozoic tectonic evolution of southern JunggarBasin,northwestern China:Constraints from strati-graphic and sedi mentologic evidences[J].GeologicalJournal of China Universities,2004,10(4):554-561.
[4]任新成.准噶尔盆地乌伦古坳陷中生代构造单元划分[J].油气地球物理,2008,6(4):38-41.REN Xin-cheng.The division of Mesozoic structuralunit of Wulungu depression in Junggar Basin[J].Pe-troleum Geophysics,2008,6(4):38-41.
[5]陈新,卢华复,舒良树,等.准噶尔盆地构造演化分析新进展[J].高校地质学报,2002,8(3):257-267.CHEN Xin,LU Hua-fu,SHU Liang-shu,et al.Study on tectonic evolution of Junggar Basin[J].Geo-logical Journal of China Universities,2002,8(3):257-267.
[6]曲国胜,马宗晋,陈新发,等.论准噶尔盆地构造及其演化[J].新疆石油地质,2009,30(1):1-5.QU Guo-sheng,MA Zhong-jin,CHEN Xin-fa,et al.On structures and evolutions in Junggar Basin[J].Xinjiang Petroleum Geology,2009,30(1):1-5.
[7]吴晓智,赵永德,李策.准噶尔东北缘前陆盆地构造演化与油气关系[J].新疆地质,1996,14(4):297-305.WU Xiao-zhi,ZHAO Yong-de,LI Ce.Tectonic evo-lution of foreland basin at northeastern margin of Jung-gar and its relation with oil-gas[J].Xinjiang Geology,1996,14(4):297-305.
[8]肖序常,汤耀庆,冯益民,等.新疆北部及邻区大地构造[M].北京:地质出版社,1992:91-92.XIAO Xu-chang,TANG Yao-qing,FENG Yi-min,etal.Tectonic Evolution of the Northern Xinjiang and ItsAdjacent Regions[M].Beijing:Geological PublishingHouse,1992:91-92.
[9]新疆维吾尔自治区地质矿场局.新疆维吾尔自治区区域地质志[M].北京:地质出版社,1993:6-732.Bureau of Geology and mineral Resources of XinjiangUygur Autonomous Regions.Regional Geology of Xin-jiang Uygur Autonomous Regions[M].Beijing:Geolog-ical Publishing House,1993:6-732.
[10]何登发.不整合面的结构与油气聚集[J].石油勘探与开发,2007,34(2):142-149.HE Deng-fa.Structure of unconformity and its con-trol on hydrocarbon accumulation[J].Petroleum Ex-ploration and Development,2007,34(2):142-149.
[11]王燮培,费琪,张家骅.石油勘探构造分析[M].武汉:中国地质大学出版社,1990:78-79.WANG Xie-pei,FEI Qi,ZHANGJia-hua.PetroleumExploration Tectonic Analysis[M].Wuhan:China U-niversity of Geosciences Press,1990:8-79.
[12]王涛,王晓霞,郑亚东,等.花岗岩构造研究及花岗岩构造动力学刍议[J].地质科学,2007,42(1):91-113.WANG Tao,WANG Xiao-xia,ZHENG Ya-dong,etal.Studies on structures of granitic plutons and gra-nitic tectonic dynamics[J].Chinese Journal of Geolo-gy,2007,42(1):91-113.
[13]李志纯.阿尔泰造山带构造演化研究中的几个关键问题剖析[J].大地构造与成矿学,1996,12:283-297.LI Zhi-chun.Several problems of tectonic evolutionstudies of the altai orogenic belt[J].GeotectonicaMetallogenia,1996,12:283-297.
[14]胡霭琴,王中刚,涂光炽,等.新疆北部地质演化及成岩成矿规律[M].北京:科学出版社,1997:73-75.HU Ai-qin,WANG Zhong-gang,TU Guang-chi,etal.Geological Evolution and Regularity of Rock-form-ing and Ore-forming in Northern Xinjiang[M].Bei-jing:Science Publishing House,1997:73-75.
[15]袁万明,董金泉,保增宽,等.新疆阿尔泰造山带构造作用的锆石裂变径迹分析[J].地球学报,2005,26(增):239-243.YUAN Wan-ming,DONG Jin-quan,BAO Zeng-kuan,et al.Zircon fission track analyses of tectonicsin the Altay Mountains[J].Acta Geoscientica Sinica,2005,26(Sup):239-243.
[16]王中刚,赵振华,邹天人,等.阿尔泰花岗岩类地球化学[M].北京:科学出版社,1998:16.WANG Zhong-gang,ZHAO Zhen-hua,ZOU Tian-ren,et al.Geochemistry of Granites in Altay[M].Beijing:Science Press,1998:16.
[17]孙国智,柳益群.新疆博格达山隆升时间初步分析[J].沉积学报,2009,27(3):487-493.SUN Guo-zhi,LI U Yi-qun.The preli minary analysisof the uplift ti me of Bogda Mountain,Xinjiang,Northwest China[J].Acta Sedmentologica Sinica,2009,27(3):487-493.
[18]朱绅玉.内蒙古色尔腾山-大青山地区推覆构造[J].内蒙古地质,1997,84(1):41-47.ZHUShen-yu.Nappe tectonics in sertengshan-daqings-han,inner Mongolia[J].Geology of Inner Mongolia,1997,84(1):41-47.
[19]王涛,郑亚东.中蒙边界中生代推覆-伸展递进转换及地壳尺度的切向剪切[J].地质通报,2002,21(4,5):232-237.WANG Tao,ZHENG Ya-dong.Mesozoic progressivetransition fromoverthrusting to extensionin the Sino-Mongolian border region and crustal-scale tangentialshear[J].Geological Bulletin of China,2002,21(4,5):232-237.
[20]郑亚东,DAVIS G A,王琮,等.燕山带中生代主要构造事件与板块构造背景问题[J].地质学报,2000,74(4):289-302.ZHENG Ya-dong,DAVIS G A,WANG Cong,et al.Major Mesozoic tectonic events in the Yanshan Beltand the Plate tectonic setting[J].Acta Geologica Sini-ca,2000,74(4):289-302.
[21]郑亚东,曾令森,李健波,等.辽南中生代造山期缩短滑脱与晚造山伸展拆离构造[J].地质科学,2009,44(3):811-824.ZHENG Ya-dong,ZENG Ling-sen,LI Jian-bo,etal.Mesozoic orogeniccontractional decollement andlate-orogenic extensional detachment in the southernLiaoning Peninsula[J].Chinese Journal of Geology,2009,44(3):811-824.
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