新疆博格达山北缘晚古生代—中生代古水流样式转折及其构造意义  

Analysis of the Late Paleozoic and Mesozoic Paleocurrents and It′s Constructional Significance of the Northern Bogdashan, Xinjiang

作　　者：李玮[1] 胡健民[1] 黎敦朋[1] 刘金侠[2] 孙宜朴[2] 梁积伟[3] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]中国石油化工股份有限公司石油勘探研究院,北京100083 [3]西北大学大陆动力学教育部重点实验室,西安710069

出　　处：《沉积学报》2007年第2期283-292,共10页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(批准号:40272097);中国石油化工股份公司油田事业部项目(编号:WX2005-51)资助

摘　　要：新疆准噶尔盆地南缘博格达山北缘地区古水流方向在晚古生代到中生代期间发生过三次重要的转变。晚石炭世晚期以前指向南,晚石炭世晚期到二叠纪期间指向东、南东东向,三叠纪—侏罗纪指向南,白垩纪及其以后指向北。结合盆地物源和沉积环境分析,博格达山北缘自晚古生代以来可划分为四个构造演化阶段,古流向转折期为盆地各期构造演化的分界线,它们是盆地对周缘造山带构造演化沉积响应的重要记录。另一方面,古水流转折时间资料的获得,对准噶尔盆地周缘不同构造带的隆升时代是一个非常重要的限定。晚石炭世晚期至二叠纪,古水流资料指示沉积物主要来自准噶尔盆地西部,准噶尔盆地西—西北缘强烈隆升,自三叠纪早期开始到侏罗纪晚期,准噶尔盆地北缘抬升,博格达山北缘沉积物主要来自北方;侏罗纪晚期到白垩纪,古水流指示沉积物主要来自盆地南部,博格达山隆起并遭受剥蚀。然而,什么原因造成石炭纪末以来,准噶尔盆地周缘几个造山带顺时针方向依次隆起,有待进一步研究。The northern Bogdashan is located in the south of the Junggar Basin and in the north of Tian Shan. Paleocurrents analysis reveals that paleocurrent direction had three important abrupt transformations from the Neopaleozoic to the Cenozoic. Before the Late Carboniferous, the paleocurrent directions were from north to south. During the Permian, the paleocurrent directions were from west to east or form northwest to southeast. From the Triassic Period to the Jurassic, the paleocurrent directions were from north to south. From the Cretaceous to the Cenozoic, the paleocur- rent directions was form south to north. The northern Bogodashan may be divided four tectonic evolution stages form the Neopaleozoic to the Cenozoic by integrated analysis paleocurrent, provenance and sidimentary environment. The transition phase of paleocurrent directions was not only the boundary of each stages of basin tectonic evolution but also important sedimentary record of orogenic belt evolution around the area. Furthermore, the transition time of the paleocurrent directions may restricts when structural belt around Bogodashan had uplifted. At the end of the late Carboniferous, the north western Junggar Basin had be intensity uplift and subsequently sediments fluxes into the basin form west to east. At begin of the Triassic Period, the northern jungar basin was uplifted for basin from the Triassic to the Jurassic. At the end of the Jurassic, the Bogodashan and it provided clastic sediments began to be uplifted and provided clastic sediments for besides of the Bogodashan. Why had the orogenic belt be uplifted clockwise around of the Junggar Basin？ It would be researched further.

关 键 词：新疆 准噶尔盆地 古水流 沉积环境 盆山耦合 

分 类 号：P512.2[天文地球—地质学]