| 华东地区早—中三叠世海相地层划分和对比 |
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| 关键词:marine Triassic strata stratigraphic division and correlation stratigraphic regionalization Indosinian movement east China |
| 基金项目:国家自然科学基金(编号: 41272372; 41172312) |
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| 摘要: |
| Division and Correlation of Marine Lower–Middle Triassic Strata in East China |
| Marine Triassic sedimentation of east China occurred only in the Early-Middle Triassic time. The marine Lower-Middle Triassic successions not only are the depositional products in the sedimentary basins controlled by the regional tectonism but also represent the tectonic pattern and process of the Indosinian movement in the region. The Triassic strata of east China can be divided into two stratigraphic regions and six stratigraphic subregions. The stratigraphic sequences within each stratigraphic region can be unified into a uniform lithostratigraphic system according to the time attribute and lithofacies paleogeographic affiliation of the stratigraphic units, except for some specific geological bodies of quite distinctive lithofacies that can be separately named. The lithostratigraphic sequences can be well correlated on the basis of the integrated study of some characteristic paleontological and environmental events. The spatial and temporal variation of stratigraphic sequence indicates that the first episode or prologue of the Indosinian movement should have taken place in the late Early Triassic period, which resulted in the formation of a series of secondary marginal seas in the northern part of the Yangtze block due to its suturing with the North China block after that time, and the suture zone was finally closed in the late Middle Triassic. In the meantime, the southern margin of the Yangtze block became steepened to form a platform-slope-basin sedimentary system during the late Early Triassic with the compression of the Cathaysia block, and the deep basin was finally closed at the end of the Early Triassic, whereas united clastic sedimentary basins across the blocks occurred in the Middle Triassic. |
| TONG Jin-nan.2015.Division and Correlation of Marine Lower–Middle Triassic Strata in East China[J].Acta Geoscientica Sinica,36(5):546-558. |
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