| 下扬子中生代沉积盆地演化 |
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| 引用本文： | 张宗言,何卫红,韦一,柯学,骆满生.下扬子中生代沉积盆地演化[J].地球科学,2014,39(8):1017-1034. |
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| 作者姓名： | 张宗言 何卫红 韦一 柯学 骆满生 |
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| 作者单位： | 1.中国地质大学地球科学学院, 湖北武汉 430074 |
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| 基金项目： | 中国地质调查局项目(Nos.1212010733802,12120113012500) |
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| 摘 要： | 通过对下扬子地区各地层分区中生代岩石地层序列、沉积建造详细分析以及生物地层与年代地层划分对比, 在盆地原型恢复、盆地充填序列和岩相古地理综合分析的基础上, 划分出下扬子陆块中生代不同时段的5类沉积盆地: 陆表海(T1-2)、周缘前陆盆地(T3-J1)、压陷盆地(T3-J2)、断陷盆地(J3-K)和拉分盆地(J3-K), 初步建立了下扬子陆块中生代沉积盆地时空分布格架.分析了下扬子中生代盆地沉积大地构造环境演化历程: 三叠纪-早侏罗世为与特提斯海演化相关的构造阶段, 分为早三叠世-中三叠世陆表海和晚三叠世-早侏罗世前陆盆地2个亚阶段; 中侏罗世-白垩纪转化为滨太平洋构造阶段, 中侏罗世以挤压构造背景为主, 大部分地区为隆升剥蚀区, 晚侏罗世-白垩纪为强裂伸展拉张期, 发育了一系列北东向火山-沉积断陷盆地和拉分盆地, 盆-岭构造格局形成.
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| 关 键 词： | 下扬子 中生代 沉积 构造 盆地演化 |
| 收稿时间： | 2014-03-12 |
Evolution of Mesozoic Sedimentary Basins in the Lower Yangtze |
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| Abstract: | The Lower Yangtze continent formed during Mesozoic is divided into 5 types of sedimentary basin with different time frames, namely, epeiric sea (T1-2), peripheral foreland basin(T3-J1), pressurized basin(T3-J2), fault-depression basin(J3-K), and pull apart basin (J3-K) in this paper based on the study of lithostratigraphy, sedimentary formation, biostratigraphic and chronostratigraphic correlation, prototype basin, basin filling sequences, and comprehensive lithofacies paleogeographic analysis of the study area in addition. The space distribution framework of Mesozoic Lower Yangtze continental sedimentary basin is established, and the tectonic environment evolution is discussed. It is found that the Triassic-Early Jurassic tectonic phase is related to the evolution of Tethys Sea, which can be divided into two sub-phases of Early-Middle Triassic epeiric sea and Late Triassic foreland basin. The Jurassic-Cretaceous phase transformed to Peri-Pacific tectonic domain can be divided into two sub-phases. Early-Middle Jurassic dominated by compressive tectonic background mainly developed the uplift and erosion areas, whereas Late Jurassic-Cretaceous characterized by an extensional tectonic environment developed a series of NE volcanic-sedimentary fault-depression basin and pull apart basin, which in turn formed basin-range tectonic framework. |
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