| 柏道远,曾广乾,黄超,肖立权,李彬,陈剑锋,曹创华.湖南长平盆地构造单元划分、控盆断裂类型及形成动力机制[J].矿产勘查,2026,17(5):758-775 |
| 湖南长平盆地构造单元划分、控盆断裂类型及形成动力机制 |
| Division of tectonic units, types of basin-controlling faults of the Changping Basin, Hunan Province, and dynamic formation mechanisms of the basin |
| 投稿时间：2026-02-04 |
| DOI：10.20008/j.kckc.202605002 |
| 中文关键词: 长平盆地 构造单元 控盆断裂走向 控盆断裂活动 先存断裂背景 动力机制 |
| 英文关键词: Changping Basin tectonic units orientation of basin-controlling faults activity of basin-controlling faults tectonic setting of pre-existing fault formation dynamic mechanism |
| 基金项目:本文受湖南省地质院科研项目(HNGSTP202404、HNGSTP202306)、自然资源部新一轮找矿突破战略行动科技支撑项目(ZKKJ202408)、深地国家科技重大专项(2025ZD1007804，2025ZD1007803)联合资助。 |
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| 中文摘要: |
| 目前对华南晚中生代断陷盆地不同方向控盆断裂及其先期活动以及盆地复杂结构的构造成因缺乏研究，对盆地形成的动力学机制尚存在认识分歧。长平盆地为区域代表性晚中生代大型盆地，本文通过野外地质调查和已有区域地质和地球物理资料分析，对长平盆地的结构组成、控盆断裂以及形成的动力机制进行全面研究，取得以下主要认识。长平盆地可分为组成盆地主体的长寿段(Ⅰ)、加义—龙伏段(Ⅱ)、市—长沙段(Ⅳ)、湘潭—花石段(Ⅴ)以及盆地外缘的平江凹陷(Ⅲ)、湘乡凹陷(Ⅵ)和株洲盆地(Ⅶ)共7沙个次级构造单元。长平盆地的控盆断裂，根据走向可分为 NE向、NNE向、SN向、NW向、EW向和 ENE向共 6种类型，最初为形成于印支运动早幕 NW向挤压、印支运动晚幕 SN-NNW向挤压、早燕山运动 WNW向挤压等构造事件的逆断裂或走滑断裂，成盆期活动受控于区域 NW-SE向伸展体制，并可分为主动伸展、被动调节和复合型的伸展-调节等 3种类型。长平盆地的形成与古太平洋俯冲板片回撤诱发环形地幔流，进而形成区域 NW-SE向伸展构造体制有关。 |
| 英文摘要: |
| Currently, there is a lack of research on the different directional basin-controlling faults and theirpre-existing activities, as well as the tectonic genesis of the complex structure of Late Mesozoic faulted basins inSouth China, and significant disagreements persist regarding the dynamic mechanisms of basin formation. TheChangping Basin is a representative large-scale Late Mesozoic basin in the region. Based on field geological sur-veys and analyses of existing regional geological and geophysical data, this paper comprehensively investigates thestructural composition, basin-controlling faults, and formation dynamics of the Changping Basin, yielding the follow-ing key insights. The Changping Basin can be divided into seven secondary tectonic units: the Changshou segment(I), Jiayi-Longfu segment (II), Shashi-Changsha segment (IV), and Xiangtan-Huashi segment (V), which form themain body of the basin; as well as the peripheral Pingjiang depression (III), Xiangxiang depression (VI), and Zhu-zhou basin (VII). Based on their strikes, the basin-controlling faults of the Changping Basin can be categorized intosix types: NE-trending, NNE-trending, SN-trending, NW-trending, EW-trending, and ENE-trending. These faultsinitially formed as reverse or strike-slip faults during tectonic events such as the Early Indosinian NW-compression, the Late Indosinian SN-NNW-compression, and the Early Yanshanian WNW-compression. Duringthe basin-forming period, their activity was governed by the regional NW-SE extensional regime and can be classi-fied into three types: active extension, passive adjustment, and composite extension-adjustment. The formation ofthe Changping Basin is associated with the regional NW-SE extensional tectonic regime triggered by the rollback ofthe Paleo-Pacific subducting slab, which induced annular mantle flow. |
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