柴达木西部地区新生代主控断裂演化过程及其意义
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摘要
基于主干地震剖面的解释结果,本文探讨了柴达木西部地区新生代主控性断裂的活动模式、活动时间及空间演化过程。结果表明,断裂演化明显存在两个大的旋回:路乐河组—下干柴沟组上段沉积期间(约54~31 Ma)和下油砂山组沉积至今(约22 Ma至今);其中第2个构造期断裂活动强烈,尤其是狮子沟组沉积以来(约8 Ma至今),中部及北部区域北西西向断裂开始大规模逆冲活动,反映了盆地晚期强烈变形过程。断层生长指数定量分析结果与其空间演化过程相吻合,共同记录了印度—欧亚板块碰撞远程效应控制下的柴达木盆地在新生代具有阶段性变形特征,从而为青藏高原东北部分阶段隆升模式提供了新的证据。
Based on interpretation of seismic data in western Qaidam Basin,the active models, active time and spatial growth of dominating Cenozoic faults are explored in this paper. The results show that the evolution of faults can be divided into two relatively fast phases:1) During the deposit time between the Lulehe Fm. and the Upper Xia Ganchaigou Fro. (~54~31 Ma). 2) Since the deposit time of the Xia Youshashan Fm. (~22 Ma~present). The latter phase was more robust,especially since~8 Ma (since the deposit time of the Shizigou Fm.), the NWW faults begin to active significantly which indicates the most drastic tectonic collision process. Quantitative analysis of the proxy of the growth faults also correspond with the two phases. Together these indicate that the collision between Indian and Eurasia continents has a twostages feature after~55 Ma they will provide some new convincible evidence for the multistages uplift of the NE Tibetan Plateau.
引文
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