| 巴颜喀拉-川西边缘前陆盆地演化 |
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| 引用本文： | 颜仰基,吴应林.巴颜喀拉-川西边缘前陆盆地演化[J].沉积与特提斯地质,1996,16(3):16-29. |
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| 作者姓名： | 颜仰基 吴应林 |
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| 作者单位： | 地质矿产部成都地质矿产研究所 |
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| 基金项目： | 国家计委专项辅助第三十届国际地质大会科研项目“东特提斯地质构造形成演化”;地矿部“八五”重点基础项目“中国西部大型盆地分析及地球动力学研究”成果之一 |
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| 摘 要： | 巴颜喀拉古特提斯洋的消亡过程反映在巴颜喀拉残留盆地到边缘前陆盆地的转化的沉积记录中。鉴于这个前陆盆地与其向克拉通延伸的组成部分－四川盆地现为龙门山逆冲带所分隔，以致已往的沉积盆地研究多针其相割裂，本文将结合巴颜喀拉洋的消亡过程，把这两个盆地视为一个统一整体来加以分析，研究其演变历程。
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| 关 键 词： | 四川盆地 古特提斯洋 盆地演化 前陆盆地 |
EVOLUTION OF THE BAY AN HAR-WEST SICHUAN PERIPHERAL FORELAND BASIN IN SOUTHWESTERN CHINA |
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| Yan Yangji,Wu Yinglin.EVOLUTION OF THE BAY AN HAR-WEST SICHUAN PERIPHERAL FORELAND BASIN IN SOUTHWESTERN CHINA[J].Sedimentary Geology and Tethyan Geology,1996,16(3):16-29. |
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| Authors: | Yan Yangji Wu Yinglin |
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| Affiliation: | Chengdu Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences |
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| Abstract: | The consumption of the Bayan Har Ocean in the Palaeo-Tethys was reflected in the depositional records of transition from remnant oceanic basin to peripheral foreland basin. Since the Bayan Har foreland basin was separated from its extended part toward Yangtze craton (Sichuan Basin) by the present-day Longmenshan overthrust zone,the previous study of each sedimentary basin was carried out independently.In this paper,an integrated study has been conducted so as to give a viable explanation for the evolution of the two basins.
While the Yangtze plate as a subduction one wedged westwards during the Late Permian,there occurred bidirectional subduction toward the Kunlun-Qaidam landmass in the north and toward the Qiangtang-Qamdo landmass in the south.The authors contend that the initiation of the transition from the remnant oceanic basin to peripheral foreland basin, when the bulk of the Bayan Har Ocean was closed,dates back to the middle-late Ladinian (T22)rather than the Late Triassicas is interpreted by most geologists at home.This new idea is supported by the formation of the foreland bulge in the vast area of central Sichuan basin in correspondence with the flexural subsidence of the foreland basin during the middle and late Ladinian.The subsidence of the foreland basin led to the termination of the starved sedimentary basin(T1-T21)on the passive margin,where more than 2000- to 10000 m thick flyschoid deposits were laid down and overlapped onto the Yangtze cratonic margin.The littoral coal-bearing molasse deposits and continental coal-bearing molasse deposits were accumulated in response to the progradation of the overthrust zone from north to south during the Norian and Rhaetian.The foreland basin was migrated into the area of western Sichuan Basin during the middle and late Late Triassic when the evolutionary stage of the postorogenic foreland basin with the continental molasse commenced under the influence of intracontinental convergence.Finally,the later uplifting of the Sichuan Basin permitted the termination of the foreland basin during the Paleogene. |
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| Keywords: | Bayan Har-Sichuan Basin transition during the middle and late Ladinian evolution of the peripheral foreland basin |
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