定远凹陷形成的区域构造背景及其演化过程

doi:10.16108/j.issn1006-7493.2020062

高校地质学报 ›› 2022, Vol. 28 ›› Issue (1): 86-95.DOI: 10.16108/j.issn1006-7493.2020062

定远凹陷形成的区域构造背景及其演化过程

詹润^1，2，丁海^1，2*，张文永^1，2，孙贵^1，2，随峰堂^1，2，辛永超³

1. 安徽省煤田地质局勘查研究院，合肥 230088；
2. 安徽省非常规天然气工程技术研究中心，合肥 230088；
3. 安徽省煤田地质局物探测量队，宿州 234000

出版日期:2022-02-20 发布日期:2022-02-20

Regional Background and Tectonic Evolution of Dingyuan Sag

ZHAN Run^{1, 2}，DING Hai^{1, 2*}，ZHANG Wenyong^{1, 2}，SUN Gui^{1, 2}，SUI Fengtang¹，XIN Yongchao³

1. Exploration Research Institute Anhui Provincial Bureau of Coal Geology, Hefei 230088, China;
2. Anhui Province Engineering Technology Research Center of Unconventional Gas, Hefei 230088, China;
3. Geophysical Surveying Team of Anhui Bureau of Coal Geology, Suzhou 234000, China

Online:2022-02-20 Published:2022-02-20

摘要/Abstract

摘要： 定远凹陷上古生界构造归属及其构造演化过程，对下一步该地区煤炭资源评价与非常规天然气选区具有关键性的意义。文章利用最新的地球物理与钻探成果，应用构造解析及区域对比等方法，结合区域构造规律与前人相关认识，对定远凹陷构造特征、上古生界构造归属及中生代以来的构造演化过程进行了详细的论述，其结果认为定远凹陷内发育的上古生界煤系地层属于淮南煤田中部复式向斜构造带东部的延伸。该凹陷受大别造山带隆起及郯庐断裂带中、新生代走滑活动影响，分别经历了印支期（T3）前陆变形、早中侏罗世（J1+2）相对隆起、晚侏罗世（J3）末期至早白垩世初期（K1初期）郯庐断裂带左行走滑改造、早白垩世期间（K1）至古近纪(E）伸展改造、古近纪末期挤压反转以及新近纪（Q）—第四纪（N）坳陷式均匀沉降六个主要演化阶段。

关键词: 定远凹陷, 淮南煤田, 郯庐断裂带, 煤系地层, 构造归属, 区域构造背景, 演化过程

Abstract: Tectonic evolution and its origin of the upper Paleozoic in the Dingyuan Sag are essential for the evaluation of coal resources and exploration targets of unconventional natural gas. Based on the latest geophysical and drilling data, combined with results from previous studies, we discussed the tectonic evolution and its origin in detail via structural analysis and regional comparison. Results show that the upper Paleozoic coal-bearing strata are comparable to the middle segment of the Huainan coalfield, which show an anticline pattern. The Dingyuan Sag has been affected by the strike-slip activities of the Tan-Lu Fault Zone and uplift of the Dabie Orogenic Belt from the Mesozoic to Cenozoic. The tectonic evolution in the Dingyuan Sag can be divided into six main stages, including foreland deformation in the Indosinian (T3), relative uplift in the early-middle Jurassic (J1+2), reformation by strike-slip activities of the Tan-Lu fault zone from the late Jurassic (J3) to early Cretaceous, reformation by extension activity from the early Cretaceous (K1) to Paleogene (E), inversion by compression activity in the late Paleogene, and depression with uniform deposition from the Neogene to Quaternary (N-Q).

Key words: Dingyuan Sag, Huainan coalfield, Tan-Lu fault zone, coal-bearing strata, tectonic implicaiton, regional tectonic
setting, evolution process

中图分类号:

P548

詹润, 丁海, 张文永, 孙贵, 随峰堂, 辛永超. 定远凹陷形成的区域构造背景及其演化过程[J]. 高校地质学报, 2022, 28(1): 86-95.

ZHAN Run, DING Hai, ZHANG Wenyong, SUN Gui, SUI Fengtang, XIN Yongchao. Regional Background and Tectonic Evolution of Dingyuan Sag[J]. Geological Journal of China Universities, 2022, 28(1): 86-95.

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定远凹陷形成的区域构造背景及其演化过程

Regional Background and Tectonic Evolution of Dingyuan Sag

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