| 华北晚中生代构造演化过程——根据太行山北部盆地沉积记录 |
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| 引用本文：王永超,董树文,施 炜,岑敏,李江瑜.2016.华北晚中生代构造演化过程——根据太行山北部盆地沉积记录[J].地球学报,37(1):35-45. |
| DOI：10.3975/cagsb.2016.01.04 |
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| 基金项目:国家专项“深部探测与实验研究”(编号: SinoProbe-08-01); 中国地质调查局地质调查项目(编号: 1212011120099) |
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| 中文摘要:太行山北部地区处于燕山山脉和太行山山脉的交汇处, 其侏罗纪—白垩纪叠加盆地发育过程记录了东西向盆地向北东向盆地转化过程, 对刻画华北晚中生代陆内变形过程及其动力学背景具有重要意义。本文以太行山北部草沟堡盆地和招柏盆地为例, 在盆地基本构造格架分析的基础上, 通过详细的沉积物物源分析、盆地原型再造等沉积学方法, 结合岩浆岩同位素年代学数据, 提出太行山北部晚中生代构造演化过程, 主要经历四个发展演化阶段, 包括中侏罗世晚期近南北向构造挤压与挠曲盆地发育、晚侏罗世近南北向弱伸展作用与壳源火山喷发、晚侏罗世末期—早白垩世早期北西—南东向构造挤压与前陆盆地形成、早白垩世北西—南东向伸展作用与幔源火山作用。构造体制转变本质上是动力学体系的转变, 在中晚侏罗世东亚大陆多向汇聚体系之下, 太行山北部经历的多期构造叠加和盆地叠置过程折射了蒙古—鄂霍茨克构造体系向滨太平洋构造体系的转化过程。 |
| 中文关键词:太行山北部 晚中生代 沉积物物源分析 盆地原型再造 西伯利亚板块 Izanagi板块 |
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| An Analysis of Late Mesozoic Tectonic Evolution Process in Northern China: Based on Basin Sedimentary Records in Northern Taihang Mountains |
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| Abstract:The northern Taihang Mountains are located at the junction of the Yanshan tectonic belt with the Taihang Mountains belt, and their superimposed basin development process documented the basin trending conversion process from EW to NE during Jurassic to Cretaceous, which is significant for depicting the intracontinental deformation process and its dynamic background during the late Mesozoic in North China. Caogoubu basin and Zhaobai basin located in northern Taihang Mountains were selected as examples in this paper. According to the basic structural framework analysis of basins in combination with isotope chronologic data from magmatic rocks and sedimentology methods which include the detailed analysis of sediment provenance, prototype basin reconstruction and so on, tectonic evolution history of the northern Taihang Mountains during the late Mesozoic can be detected, which includes four stage evolution sequences : (1) nearly N–S contraction and flexural basin development during the late middle Jurassic, (2) nearly N–S low-magnitude extention and crust sources volcanic eruption that occurred in the late Jurassic, (3) NW–SE contraction and foreland basin development from the end of the late Jurassic to the earliest Cretaceous, and (4) NW–SE extension and mantle sources volcanic eruption during the early Cretaceous. The conversion of tectonic regimes is essentially the transformation of its geodynamic systems, and on the context of the East Asia multi-direction convergent tectonic system during the Middle–Late Jurassic, the multi-phases tectonic and basin superposition that occurred in northern Taihang Mountains during the late Mesozoic indicates the conversion process during which the Mogolia–Okhotsk tectonic system graded into the Marginal–Pacific tectonic system. |
| keywords:northern Taihang Mountains late Mesozoic sediment provenance analysis prototype basin reconstruction Siberian plate Izanagi plate |
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