塔里木盆地东北部英吉苏凹陷侏罗系沉积—构造背景
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摘要
英吉苏凹陷位于塔里木盆地东北部,侏罗纪属中亚—中国西北超大型盆地的一部分,是早侏罗世形成的克拉通内盆地。基于钻井、地震剖面、砂岩骨架颗粒分析和地球化学资料,本文提出当时其北界可达库鲁克塔格,物源区主要是南边的古造山带,物源为晋宁期岛弧花岗闪长岩闪长岩及部分下古生界。受燕山运动影响,中侏罗世晚期晚侏罗世该凹陷闭合隆起,白垩纪时重又沉陷成为塔里木北部坳陷的一部分。
The Yingjisu Sag, situated in northeastern Tarim Basin, was a part of the Central Asia-NW China superlarge Basin in Jurassic, and a cratonic basin (intracontinental depression) formed in Early Jurassic. Based on the recent data of drilling wells in central-northeastern Tarim, a seismic profile across the sag, Q-F-L components and REE patterns of the sandstones, the Jurassic tectono-sedimentary setting of the sag was discussed. The north boundary of the sag might reach to the Kruktag area during that time, and the sedimentary debris come from a fossil orogen to the south, which was composed of the Jinningian granodiorite-diorite, as well as the Lower Paleozoic. To be influenced by the Yanshanian movement, the sag closed and the Jurassic was reformed by the faults in the southern and central parts of the sag. In Cretaceous, the Yingjisu Sag deposited again as a part of the North Depression of Tarim Basin. In Cenozoic, the North Depression changed to be an intracontinental foreland basin with creation of the South Tianshan and Kruktag mountain chains, and thrusting of the Kongquehe fault made the Jurassic in the Yingjisu Sag reformed once again.
The Yingjisu Sag, situated in northeastern Tarim Basin, was a part of the Central Asia-NW China superlarge Basin in Jurassic, and a cratonic basin (intracontinental depression) formed in Early Jurassic. Based on the recent data of drilling wells in central-northeastern Tarim, a seismic profile across the sag, Q-F-L components and REE patterns of the sandstones, the Jurassic tectono-sedimentary setting of the sag was discussed. The north boundary of the sag might reach to the Kruktag area during that time, and the sedimentary debris come from a fossil orogen to the south, which was composed of the Jinningian granodiorite-diorite, as well as the Lower Paleozoic. To be influenced by the Yanshanian movement, the sag closed and the Jurassic was reformed by the faults in the southern and central parts of the sag. In Cretaceous, the Yingjisu Sag deposited again as a part of the North Depression of Tarim Basin. In Cenozoic, the North Depression changed to be an intracontinental foreland basin with creation of the South Tianshan and Kruktag mountain chains, and thrusting of the Kongquehe fault made the Jurassic in the Yingjisu Sag reformed once again.
引文
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李德伦,段吉业,梁桂香,单玄龙,程新民.2001.英吉苏凹陷中新生代背驮式前陆盆地构造特征及成因机制.世界地质,20(3):242—248.LiDelun,DuanJiye,LiangGuixiang,ShanXuanlongandChengXinmin.2001.TectoniccharacteristicsandgeneticmechanismofYingjisupiggybackforelandbasin,Xinjiang.WorldGeology,20(3):242—248.
李曰俊,宋文杰,吴根耀,王艺芬,李宇平,郑多明.2005a.塔里木盆地中部隐伏的晋宁期花岗闪长岩和闪长岩.中国科学D辑,35(2):97—104.LiYuejun,SongWenjie,WuGenyao,WangYifen,LiYupingandZhengDuoming.2005a.JinninggranodioriteanddioritedeeplyconcealedinthecentralTarimBasin.ScienceinChina,SeriesD,35(2):97—104.
李曰俊,孙龙德,胡世玲,宋文杰,王国林,谭泽金.2003.塔里木盆地塔参1井底部花岗闪长岩40Ar39Ar年代学研究.岩石学报,19(3):530—536.LiYuejun,SunLongde,HuShiling,SongWenjie,WangGuolinandTanZejin.2003.40Ar39ArgeochronologyofthegraniteanddioriterevealedatthebottomofTancan1,thedeepestwellinChina.ActaPetrologicaSinica,19(3):530—536.
李曰俊,孙龙德,吴浩若,王国林,苏玉山,黄智斌.2004.塔里木盆地西北缘三叠系硅岩砾石中的放射虫化石及其地质意义.地质科学,39(2):153—158.LiYuejun,SunLongde,WuHaoruo,WangGuolin,SuYushanandHuangZhibin.2004.RadiolarianfossilsfromchertgravelsofTriassicconglomerateinNWmarginoftheTarimBasinandtheirgeologicalsignificance.ChineseJour.Geol.,39(2):153—158.
李曰俊,孙龙德,吴浩若,王国林,杨朝世,彭更新.2005b.南天山西端乌帕塔尔坎群发现石炭二叠纪放射虫化石.地质科学,40(2):220—226.LiYuejun,SunLongde,WuHaoruo,WangGuolin,YangChaoshiandPengGengxin.2005b.PermoCarboniferousradiolarianfromtheWupatarkanGroup,westterminalofChineseSouthTianshan.ChineseJour.Geol.,40(2):220—226.
罗金海,车自成,李继亮.2000.中亚及中国西部侏罗纪沉积盆地的构造特征.地质科学,35(4):404—413.LuoJinhai,CheZichengandLiJiliang.2000.StructuralfeaturesoftheJurassicbasinsinwesternChinaandmiddleAsia.ChineseJour.Geol.(formerly,ScientiaGeologicaSinica),35(4):404—413.
聂采军,郑威,李梅.2004.塔里木东北部英南2气藏天然气运移和聚集.地质科学,39(4):589—598.NieCaijun,ZhengWeiandLiMei.2004.GasmigrationandaccumulationoftheYingnan2gaspoolinnortheasternTarim,Xinjiang.ChineseJour.Geol.,39(4):589—598.
孙龙德,周新源,王国林.2005.塔里木盆地石油地质研究新进展和油气勘探主攻方向.地质科学,40(2):167—178.SunLongde,ZhouXinyuanandWangGuolin.2005.ContributionsofpetroleumgeologyandmaindirectionsofoilgasexplorationintheTarimBasin.ChineseJour.Geol.,40(2):167—178.
吴根耀.2002.燕山运动和中国大陆晚中生代的活化.地质科学,37(4):453—461.WuGenyao.2002.TheYanshanianorogenyandLateMesozoicactivationinChinacontinent.ChineseJour.Geol.,37(4):453—461.
AllenMB,WindleyBFandZhangChi.1992.PalaeozoiccollisionaltectonicsandmagmatismoftheChineseTienShan,centralAsia.Tectonophysics,220:89—115.
BhatiaMR.1983.Platetectonicsandgeochemicalcompositionofsandstones.JournalofGeology,91(6):611—627.
BhatiaMR.1985.RareearthelementgeochemistryofAustralianPaleozoicgraywackesandprovenanceandtectonics.SedimentaryGeology,45:97—113.
DickinsonWR,BeardLS,BrakenridgeGR,ErjavecJL,FergusonRC,InmanKF,KneppRA,LindbergFAand
RybergPT.1983.ProvenanceofNorthAmericanPhanerozoicsandstonesinrelationtotectonicsetting.Geol.Soc.Amer.Bull.,94:222—235.
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