下扬子区中—新生代变格构造运动

丁道桂; 李凤丽

doi:10.11781/sysydz202005687

下扬子区中—新生代变格构造运动

doi: 10.11781/sysydz202005687

中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126

详细信息

作者简介:
丁道桂(1946-), 男, 教授级高级工程师, 从事含油气盆地构造研究。E-mail: ddgwx@aliyun.com

中图分类号: TE121.1
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出版历程
- 收稿日期: 2020-06-22
- 修回日期: 2020-08-10
- 刊出日期: 2020-09-28

Mesozoic and Cenozoic diktyogenese in the Lower Yangtze region

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

摘要

摘要: 下扬子区在中、晚三叠世—早、中侏罗世，晚侏罗世—早白垩世和晚白垩世―第三纪时期，发生了以特提斯洋与太平洋板块联合作用所导致的3期变格构造运动。一方面极大地使下扬子区古生代盆地发生了基底拆离式递进变形改造；另一方面又在下扬子区形成了上三叠统―中、下侏罗统的前渊盆地，以及由大型断裂带的平移走滑构造所形成的上侏罗统—下白垩统火山碎屑岩拉分盆地，呈“多米诺式”排列的上白垩统—第三系半地堑盆地则是岩石圈伸展拆离构造所形成的拉张盆地。3期变格运动促使了油气的形成与再分配聚集。
- 变格运动 /
- 基底拆离 /
- 平移走滑 /
- 伸展拆离 /
- 下扬子
Abstract: Three stages of metamorphic tectonic movements took place in the Lower Yangtze region due to the joint action of the Tethys and the Pacific plates from the Middle/Late Triassic to the Early/Middle Jurassic, the Late Jurassic to the Early Cretaceous, and the Late Cretaceous to the Tertiary. They made the Paleozoic basin basements undergo detachable progressive deformations, and formed foredeep basins in the Upper Triassic and Middle/Lower Jurassic. The translational strike-slip of a large-scale fault zone formed pyroclastic pull-apart basins in the Upper Jurassic-Lower Cretaceous. The Upper Cretaceous-Tertiary semi-graben basins, which are arranged in a domino style, are extensional basins formed by lithospheric extension and detachment structures. The three transformations promoted the formation, accumulation and redistribution of oil and gas.
- diktyogenese /
- basement detachment /
- translational strike-slip /
- stretch detachment /
- Lower Yangtze region

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图 1 下扬子地区构造区划

Figure 1. Tectonic units of Lower Yangtze region

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图 2 扬子板块中—新生代陆内拉张盆地原型与分类^[4]

Figure 2. Types and classification of Meso-Cenozoic intra-continental extensional basins in Yangtze Plate

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图 3 用应力横剖面来说明的挠曲岩石圈强烈挠曲处的拆离作用

据参考文献[5]。

Figure 3. Detachment of strong deflection of flexural lithosphere explained by stress cross section

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图 4 下扬子白际山—殷家汇构造地质剖面

剖面位置见图 1。

Figure 4. Geological profile of Baijishan-Yinjiahui, Lower Yangtze region

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图 5 下扬子绩溪—滆湖平移走滑断层信手剖面

剖面位置见图 1。

Figure 5. Free hand profile of Jixi-Gehu translational strike-slip fault, Lower Yangtze region

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图 6 下扬子泾县北贡里—铜陵县新桥构造地质剖面

剖面位置见图 1。

Figure 6. Tectonic profile from Beigongli in Jingxian to Xinqiao in Tongling, Lower Yangtze region

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图 7 苏北盆地G44测线地震地质解释剖面^[19]

剖面位置见图 1。

Figure 7. Geologic interpretation along seismic line G44 in Subei Basin

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图 8 伸展拆离断层地震反射特征

Figure 8. Seismic reflection of extensional detachment faults

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图 9 南黄海地区伸展拆离构造剖面^[19]

剖面位置见图 1。

Figure 9. Tectonic profile of extensional detachments in South Yellow Sea Basin

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