四川盆地及邻区二叠纪梁山-栖霞组沉积盆地原型及其演化

发布时间：2018-02-26 12:44

本文关键词： 碳酸盐岩台地原型盆地栖霞组古地理盆地演化　出处：《岩石学报》2017年04期 　论文类型：期刊论文

【摘要】：中二叠世的上扬子地区开始经历大规模的海侵作用,形成了较为稳定的碳酸盐岩沉积建造。探究该时期四川盆地及邻区沉积充填规律与构造演化特征,是揭示原型盆地成因机制的关键,又是认识四川盆地多旋回叠加过程的重要一环。在前人研究成果的基础之上,综合利用钻井、野外剖面等地质资料,重建了梁山组、栖霞组沉积时期原型盆地构造-古地理格局,并分析其构造-沉积演化过程。主要受继承自晚石炭世以来的中部隆升,东西两侧下沉的的古地貌和初期大规模海侵作用的影响,中二叠世梁山组沉积时期,本地区以滨岸-潮坪沉积体系为特征;栖霞组沉积早期,逐渐过渡到碳酸盐岩台地沉积环境,受区域性伸展作用的影响,海平面相对上升,以开阔台地沉积环境为特征;栖霞组沉积晚期,海平面相对下降,以局限台地和台缘滩沉积环境为特征。因此,反映出四川盆地及邻区在该时期主要受伸展裂解作用的影响,可被认为是一个典型的克拉通内坳陷和边缘裂陷盆地。海平面升降的旋回性变化和盆地的差异性沉降对该时期原型盆地的沉积充填样式和古地理格局的演变产生了重要影响。
[Abstract]:The Upper Yangtze area of the Middle Permian began to undergo large-scale transgression and formed a relatively stable carbonate sedimentary formation. It is the key to reveal the genetic mechanism of the prototype basin, and it is also an important link in understanding the multi-cycle superposition process in Sichuan basin. Based on the previous research results, the Liangshan formation was reconstructed by comprehensive use of geological data such as drilling, field profile, etc. The tectonic-paleogeographic pattern of the archetype basin of Qixia formation during the sedimentary period and its tectonic-sedimentary evolution process are mainly influenced by the paleogeomorphology and the early large-scale transgressions inherited from the central uplift and subsidence of the east and west sides since the late Carboniferous. In the middle Permian Liangshan formation sedimentary period, the area was characterized by shore-tidal flat sedimentary system, the Qixia formation gradually transitioned to carbonate platform sedimentary environment in the early sedimentary period, and the sea level rose relatively under the influence of regional extension. It is characterized by the open platform sedimentary environment, the late stage of Qixia formation, the relative decline of sea level, and the depositional environment of limited platform and platform margin beach. Therefore, it reflects that the Sichuan Basin and its adjacent areas were mainly affected by extensional pyrolysis in this period. The cyclicity of sea level rise and fall and the differential subsidence of the basin have an important influence on the evolution of sedimentary filling style and paleogeographic pattern of the prototype basin in this period.
【作者单位】：中国地质大学能源学院;
【基金】：国家自然科学基金重点项目(41430316)资助
【分类号】：P534.46

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