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:
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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.
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Tertiary Gravity Flow Deposits in Jinggu-Zhenyuan Region, Southwestern Yunnan, and Their Geological Significance
- 1.
Beijing Graduate School, China University of Mining and Technology, Beijing 100083;
- 2.
Institute of Geology, Chinese Academy of Sciences, Beijing 100029
- Received Date: 1997-05-20
- Rev Recd Date:
1997-09-04
- Publish Date:
1998-06-10
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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.
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