塔里木盆地东北部英吉苏凹陷侏罗系沉积——构造背景

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。

JURASSIC TECTONO-SEDIMENTARY SETTING OF THE YINGJISU SAG, NORTHEASTERN TARIM

The Yingjisu Sag, situated in northeastern Tarim Basin, was a part of the Central Asiaim, a seismic profile across the sag, Q-F-L components and REE patterns of the sandstones, the Jurassic teetono-sedimentary setting of the sag was discussed. The north boundary of the sag might reach to the Krnktag 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.