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Liu Shanyin, Zhong Dalai, Wu Genyao. Tertiary Gravity Flow Deposits in Jinggu-Zhenyuan Region, Southwestern Yunnan, and Their Geological Significance[J]. Acta Sedimentologica Sinica, 1998, 16(2): 50-54.
Citation: Liu Shanyin, Zhong Dalai, Wu Genyao. Tertiary Gravity Flow Deposits in Jinggu-Zhenyuan Region, Southwestern Yunnan, and Their Geological Significance[J]. Acta Sedimentologica Sinica, 1998, 16(2): 50-54.

Tertiary Gravity Flow Deposits in Jinggu-Zhenyuan Region, Southwestern Yunnan, and Their Geological Significance

  • Received Date: 1997-05-20
  • Rev Recd Date: 1997-09-04
  • Publish Date: 1998-06-10
  • The Tertiary gravity flow deposits in the Jingg u-Zhenyuan region, southwestern Yunnan, can be divided into three types: debris flow, grain flow and turbidity current. Debris flow deposits are mainly composed of conglomerates, which are matrix supported and poorly sorted. Their grain-size distribution frequency curves are characterized by having only one major and some secondary peaks. Grain flow deposits are also mainly composed of conglomerates, which are identified by their matrix lacking features. Clasts in these deposits were cemented by ironoxides and clay minerals, as thin film around them. Their grain-size distribution frequency curves show multimodal distribution without major peak. Turbidity current deposits are mainly composed of sandstone, siltstone and mudstone, which are characterized by their Bouma sequence. Their grain-size cumulative proba bility curves and C-M diagram reflect features of low-density flow. Development of the gravity flow in the region, asresponse to regional tectonic evolution, was controlled by collisional processes of Indian continent with Eurasian continent and post-collisional intracon-tinental deformation.
  • [1] .Nemec W, Steel R J. Alluvial and coastal conglomerates: their significant features and some comments on gravelly mass-flow deposits. In: Koster E H, Steel R J, eds. Sedimentology of Gravels and Conglomerates. Canadian Society of Petroleum Geologists Memoir, 1984, 10: 1~31
    [2] .Visher G S. Grain size distribution and depositional processes. J. Sed. Petrology, 1969, 39: 1074~1106
    [3] .Glaister R P, Nelson HW. Grain-size distribution, an aid in facies identification. Bulletin of Canadian Petroleum Geology, 1974, 22(3): 203~240
    [4] .Kochel R C, Johnson R A. Geomorphology and sedimentology of humid-temperate alluvial fans, central Virginia. In: Koster E H, Steel R J, eds. Sedimentology of Gravels and Conglomerates. Canadian Society of Petroleum Geologists Memoir, 1991, 10: 109~122
    [5] .柯宝嘉, 陈昌明, 陈志明等. 鄂尔多斯盆地西缘砾质冲积扇沉积学特征. 沉积学报, 1991, 9(3): 11~21
    [6] .Middleton G V. Experimental studies related to flysh sedimentation. In: Lajoie, eds. Flysh Sedimentology in North America, 1970, 253~272
    [7] .Bhattacharjee C C. The ophiolites of northeast India-a subduction zone ophiolite complex of the India- Burman orogenic belt. Tectonophgysics, 1991, 191: 213~222
    [8] .吴根耀. 中国滇西—泰国地区侏罗纪—第四纪盆地发育对比研究. 地质科学, 1991, (4): 359~368
    [9] .吴根耀. 滇西北地区第三纪的逆冲—推覆构造. 大地构造与成矿学, 1994, 18(4): 331~338
    [10] .钟大赉, 丁林. 青藏高原的隆起过程及其机制的探讨. 中国科学(D辑), 1996, 26(4): 289~295
    [11] .刘善印, 钟大赉, 吴根耀. 滇西南晚第三纪含煤盆地的形成与演化. 煤炭学报, 1995, 20(4): 351~355
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  • Received:  1997-05-20
  • Revised:  1997-09-04
  • Published:  1998-06-10

Tertiary Gravity Flow Deposits in Jinggu-Zhenyuan Region, Southwestern Yunnan, and Their Geological Significance

Abstract: The Tertiary gravity flow deposits in the Jingg u-Zhenyuan region, southwestern Yunnan, can be divided into three types: debris flow, grain flow and turbidity current. Debris flow deposits are mainly composed of conglomerates, which are matrix supported and poorly sorted. Their grain-size distribution frequency curves are characterized by having only one major and some secondary peaks. Grain flow deposits are also mainly composed of conglomerates, which are identified by their matrix lacking features. Clasts in these deposits were cemented by ironoxides and clay minerals, as thin film around them. Their grain-size distribution frequency curves show multimodal distribution without major peak. Turbidity current deposits are mainly composed of sandstone, siltstone and mudstone, which are characterized by their Bouma sequence. Their grain-size cumulative proba bility curves and C-M diagram reflect features of low-density flow. Development of the gravity flow in the region, asresponse to regional tectonic evolution, was controlled by collisional processes of Indian continent with Eurasian continent and post-collisional intracon-tinental deformation.

Liu Shanyin, Zhong Dalai, Wu Genyao. Tertiary Gravity Flow Deposits in Jinggu-Zhenyuan Region, Southwestern Yunnan, and Their Geological Significance[J]. Acta Sedimentologica Sinica, 1998, 16(2): 50-54.
Citation: Liu Shanyin, Zhong Dalai, Wu Genyao. Tertiary Gravity Flow Deposits in Jinggu-Zhenyuan Region, Southwestern Yunnan, and Their Geological Significance[J]. Acta Sedimentologica Sinica, 1998, 16(2): 50-54.
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