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| 鄂西远安白垩纪盆地的宏观构造变形机制 | |
| 引用本文： | 乔彦波,单业华,田野,聂冠军,孙蓓.鄂西远安白垩纪盆地的宏观构造变形机制[J].大地构造与成矿学,2012,36(1):44-55. |
| 作者姓名： | 乔彦波 单业华 田野 聂冠军 孙蓓 |
| 作者单位： | 1. 中国科学院广州地球化学研究所,广东广州510640;中国科学院研究生院,北京100049 2. 中国科学院广州地球化学研究所,广东广州,510640 3. 中国科学院广州地球化学研究所,广东广州510640;中国科学院研究生院,北京100049;江苏省有色金属华东地质勘查局,江苏南京210007 |
| 基金项目： | 国家科技部重要基础研究发展规划项目，中国科学院"百人计划"项目 |
| 摘 要： | 白垩纪远安盆地是江汉盆地西北缘的次一级地堑构造,发育有多种类型的低温宏观构造变形机制,包括变形带、断层、节理、脉体和缝合线。除断层外,其它构造变形机制的分布明显受不同岩性地层或单层厚度的控制。节理主要发育在盆地南、北两边上白垩统跑马岗组中至厚层粉砂岩与泥岩互层里,缝合线和方解石脉只形成在盆地西缘上白垩统罗镜滩组砾岩里,变形带只出现在盆地南部上白垩统红花套组块状砂岩里。主要根据变形构造交切或限制关系,本文将这里的宏观变形构造划分为四期,并恢复出各期的构造应力场。前两期属于拉张成因,出现在晚白垩世裂谷阶段,第一期的拉张方向为近EW向,第二期拉张方向NWW-SEE向;后两期属于挤压成因,出现在晚白垩世以后的后裂谷阶段。相应的水平最大主压应力分别呈NNE-SSW向和NWW-SEE向,具有顺时针旋转的趋势。 |
| 关 键 词： | 宏观构造变形机制 构造应力场 古应力分析 远安盆地 |
Macro-Deformation Mechanisms for the Cretaceous Yuanan Basin,Western Hubei, Central China |
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| QIAO Yanbo , SHAN Yehua , TIAN Ye , NIE Guanjun , SUN Bei.Macro-Deformation Mechanisms for the Cretaceous Yuanan Basin,Western Hubei, Central China[J].Geotectonica et Metallogenia,2012,36(1):44-55. | |
| Authors: | QIAO Yanbo SHAN Yehua TIAN Ye NIE Guanjun SUN Bei |
| Institution: | 1,2,3 (1.Guangzhou Institute Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3.East China Mineral Exploration & Development Bureau, Nanjing 210007, Jiangsu, China) |
| Abstract: | In the Cretaceous Yuanan basin, a graben on the northwest of the Jianghan basin, there occur a variety of macrodeformation mechanisms including deformation bands, faults, joints, veins and stylolites. Except for faults, their spatial distributions are distinctly controlled by the lithology and layer thickness. Deformation bands appear only in massive sandstone of the upper Cretaceous Honghuatao Formation in the south, joints mainly in medium-thick siltstone interbedded with mudstone of upper Cretaceous Paomagang Formation in the north and the south, and stylolites and calcite veins only in conglomerate of the upper Cretaceous Luojingtan Formation in the west. Mainly based upon the abutting or crosscutting relationship between the deformation structures, we recognized four tectonic phases, in which paleostresses were inferred. The first two phases are extensional and formed during the rifting of late Cretaceous. The first phase suggested the orientation of extension was NEE-SWW, and the second phase inferred the orientation of extension was NWW-SEE. The latter two phases are compressional and were formed during the post-rifting after the late Cretaceous. The inferred horizontal large stresses are directed from NNE to SSW, and from NWW to SEE, respectively, indicating a strong tendency of clockwise rotation with time. |
| Keywords: | macrodeformation mechanism tectonic stress field palaeostress analysis Yuanan basin |
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