博格达山北缘二叠纪中晚期沉积-构造响应研究
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1.中国石油大学北京地球科学学院;2.中国石油大学北京克拉玛依校区石油学院

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P542

基金项目:

《库车坳陷盐构造突破断层的演化规律与成因机制研究》、克拉玛依市创新环境建设计划项目《达尔布特断裂带构造演变对多种地质资源的控制作用研究》、中国石油大学(北京)克拉玛依校区科研启动项目的成果。


Study on the Sedimentary Tectonic Response of the Middle-Late Permian in the Northern Edge of Bogeda mountain
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1.School of Earth Sciences,China University of PetroleumBeijing,Beijing;2.Petroleum Institute,China University of PetroleumBeijing,Karamay Campus,Karamay,Xinjiang

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    摘要:

    博格达山北缘为准噶尔盆地与天山造山带关键部位,是研究盆地关系的重点区域,其二叠纪中、晚期的构造演化和沉积时空演变关系存在较大争议。本研究通过野外实地观测、镜下薄片鉴定、粒度分析实验和地震资料解析等方法手段,针对博格达山东、西部两条剖面——井井子沟剖面和大龙口剖面开展解剖研究,分析其沉积类型和演变过程,解析盆山构造变形和发育特征,探讨沉积与构造的响应关系,研究结果表明:二叠系中统乌拉泊组为湖成三角洲相,中统井井子沟组至红雁池组为湖泊相,上统泉子街组为冲积扇-河流相沉积,上统梧桐沟组和锅底坑组为滨浅湖-三角洲相沉积;研究区构造存在两个主要构造层,下构造层以伸展断陷为主要地质结构,上构造层以前陆冲断为主要构造变形。多期构造活动控制二叠系博格达地区沉积演化过程,在挤压构造背景下,中统湖泊相变为上统冲积扇-河流相沉积,后期构造活动趋于稳定,沉积相为滨浅湖-三角洲相。

    Abstract:

    The northern edge of Bogeda Mountain is the key part of Junggar Basin and Tianshan orogenic belt, thus it is also the key area to study the basin relationship. Middle-Late Permian tectonic and deposition evolution still remain controversial. In this study, we combined sedimentological and geophysical methods such as field observation, microscopic identification of rock slices, granularity analysis experiment and seismic data analysis, to study Sedimentary types and evolution, Deformation and development characteristics of basin structure, and sedimentary tectonic response of Jingzigou section and Dalongkou section which in the east and west Bogeda Mountain. The research results indicate that the Middle Permian Wulabo Formation to Hongyanchi Formation were lacustrine facies deposition, while the Upper Quanzijie Formation was alluvial fan-fluvial facies deposition, and the Upper Guodikeng and Wutonggou Formation were shore-shallow lacustrine-delta facies deposition .There are two main structural layers in the study area, the lower structural layer is extensional fault depression as the main geological structure, and the upper structural layer is foreland thrust as the main structural deformation. Multiple phases of tectonic activities control the sedimentary evolution process of Permian Bogeda area. Under the background of compressional structure, the Middle Permian lacustrine facies deposition became the Upper Permian alluvial fan-fluvial facies deposition.And the tectonic activity became stable later, and the sedimentary facies turned to shore-shallow lacustrine-delta facies.

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  • 收稿日期:2023-02-08
  • 最后修改日期:2023-05-26
  • 录用日期:2023-05-29
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