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柴达木中生代盆地成因机制动力学
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Abstract:
柴达木盆地是一个中、新生代的叠合盆地，新生代盆地的成因机制研究比较成熟，而中生代的成因机制尚存在一些争议，本文通过二维有限元方法计算模拟柴达木盆地中生代的应力体系和成因机制。模拟结果表明：盆地的构造演化与周缘大地构造背景密切相关，结合野外构造观测和古地理演化，认为柴达木盆地中生代断陷盆地演化经历两阶段：J1-J2时期为受近NWW方向拉应力作用的断陷盆地，J3-K1时期是受到近S-N向拉应力的断陷盆地，柴达木盆地沉降中心从柴北缘转移到柴东地区，最大主应力集中分布地区也从柴北缘转移到柴东。
The Qaidam Basin is a Mesozoic-Cenozoic superimposed basin. The research on the dynamic me-chanism of the Cenozoic Qaidam basin is relatively mature, while there are still some disputes on the Mesozoic Qaidam basin. In this paper, the stress field and dynamics are obtained by establishing two stages of 2-dimensional finite element models. We can conclude that the tectonic evolution of the Mesozoic Qaidam Basin is closely related to the tectonic setting of the surrounding areas. Based on the field structural evidence and palaeogeographic evolution, it is considered that the formation and evolution of Qaidam Basin in Mesozoic experienced two stages: During J1-J2 period, there was a faulted basin subjected to tensile stress in near NWW direction, while during J3-K1 period there was a faulted basin subjected to tensile stress in near N-S direction, the subsidence center of Qaidam Basin shifted from northern Qaidam Basin to eastern Qaidam Basin, and the concentrated distribution area of maximum principal stress also shifted from northern Qaidam Basin to eastern Qaidam Basin.
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