鄂尔多斯盆地南部中晚侏罗世-早白垩世构造沉积响应
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西安石油大学

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P531

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国家自然科学基金重点项目(项目批准号:42230815)资助。


Middle-Late Jurassic-Early Cretaceous tectonic-sedimentary response in the southern Ordos Basin
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Xi’an Shiyou University

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    摘要:

    沉积盆地底部及周边的构造活动必然影响盆地沉积充填特征及演化发生变化,这些沉积特征变化是沉积地层对构造活动响应的记录。本文根据测井解释、野外露头等资料,采用古地理和沉积相恢复的方法,对盆地中晚侏罗世-早白垩世沉积演化规律深入分析。研究表明,盆地南部发育多期次冲积扇相、河流-三角洲-湖泊和沙漠相沉积体系,出现沉积东西分异,沉积中心由东向西迁移。这一时期盆地主要受控于燕山运动影响,盆地周边发生了强烈的构造活动,盆地内部形成了东部抬升倾斜、西部下沉坳陷的构造格局。盆地西缘强烈的构造活动还导致了晚侏罗世芬芳河期西南缘发育陆内前陆盆地以及晚侏罗世和早白垩世等多套磨拉石建造和不整合接触。根据以上认识建立了中晚侏罗世-早白垩世构造沉积演化模式图,这些沉积事件的发生是对燕山运动早中期的响应记录,证明了沉积演化与秦祁造山带和吕梁隆起之间有着密切的关系。这些认识不止是对燕山运动时期盆地南部构造-沉积响应理论的补充完善,同时对盆地南部油气和铀矿等矿产资源的勘探开发具有现实意义。

    Abstract:

    The tectonic activities at the bottom and around the sedimentary basin inevitably affect the changes in the sedimentary filling characteristics and evolution of the basin, and these changes in sedimentary characteristics are a record of the response of the sedimentary strata to the tectonic activities. In this paper, we analyze the sedimentary evolution of the Middle and Late Jurassic-Early Cretaceous in the basin based on logging interpretation, field outcrops, and other data, and using the methods of paleogeography and sedimentary phase recovery. The study shows that the southern part of the basin developed multi-phase alluvial fan phase, river-delta-lake and desert phase depositional systems, and there was a sedimentary east-west divergence, with the sedimentary center migrating from east to west. During this period, the basin was mainly controlled by the influence of Yanshan movement, strong tectonic activities occurred around the basin, and a tectonic pattern of uplifting and tilting in the east and sinking and depression in the west was formed inside the basin. The strong tectonic activities at the western edge of the basin also led to the development of an intralittoral foreland basin at the southwestern edge of the Late Jurassic Fenfang River Stage, as well as the construction of several sets of mullite and unconformity contacts in the Late Jurassic and Early Cretaceous. Based on the above understandings, a model map of the Middle and Late Jurassic-Early Cretaceous tectono-sedimentary evolution has been established, and the occurrence of these sedimentary events is a record of the response to the early and middle stages of the Yanshan Movement, which proves that there is a close relationship between sedimentary evolution and the Qin-Qi orogenic belt and the Lvliang uplift. These insights are not only a complementary improvement to the theory of tectonic-sedimentary response in the southern basin during the Yanshan Movement, but also have practical significance for the exploration and development of mineral resources such as oil and gas and uranium in the southern basin.

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郭雅倩,李元昊,杨龙华,等. 鄂尔多斯盆地南部中晚侏罗世-早白垩世构造沉积响应[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-23
  • 最后修改日期:2024-06-12
  • 录用日期:2024-06-24
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