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Reconsideration of the sediment characteristics of the second member of the Triassic Xujiahe Formation in Sanhuiba,huaying mountain

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Mining Science and Technology 2010年第4期20卷 591-599页

作者： LIAO Taiping HU Jingjing ZHANG Furong LIU Lijing Chongqing University of Science and Technology Chongqing 401331 China Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

The second member of the Triassic Xujiahe Formation in the Sanhuiba area in huaying mountain is an important section of sedimentary delta facies in the Chongqing Tianfu Geological Survey and Training Base. In spite of some initial efforts on its lithology and lithofacies, the existing research is yet to be completed and suffers from contradictory conclusions and inadequate evidence. Starting from the sedimentary microfaeies types and cyclic features, we analyzed the vertical sequence of a sedimentary delta model and discovered that this section is a constructional delta deposit. Eight incomplete and asymmetric regressive cycles are marked off, given that frequent erosion surfaces appeared in the section. Based on the analysis of structural characteristics of every monocycle, we summarized the system of cycles, tracts and sequence characteristics of the overall section. In view of this systematic series of cycles, we discussed the features of the syndepositional tectonic movements in the area and conclude that, due to frequent erosion, migration and diversion of a sub-channel branch was brought about by oscillating movements of the crust. In a comparison with neighboring sections, we explored the cause of erosion and the relations between erosion and cycles. This study greatly strengthens existing research and theories, makes an important and comprehensive contribution to geological surveys and training in the area and provides essential suggestions for coal exploration, oil and gas evaluation and in general to exploration and development in the target stratum.

关键词： huaying mountain Sanhuiba Xujiahe Formation member 2 sandbodies sedimentary characteristics reconsideration

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Paleoecological associations of middle Llandovery (Silurian) corals from huaying mountain, eastern Sichuan Province

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Science China Earth Sciences 2013年第9期56卷 640-646页

作者： WANG GuangXu ZHAN RenBin DENG ZhanQiu LIU JianBo State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences School of Earth and Space Sciences Peking University

Corals are comparatively abundant in the upper member of the Baiyun'an Formation (upper Aeronian to lowerest Telychian, Llandovery, Silurian) of huaying, eastern Sichuan Province, Southwest China. Three coral associations have been recognized, i.e., in ascending order, the Mesofavosites Association, the Dentilasma Association, and the Paraceriaster Association. The Mesofavosites Association occurs at horizons indicating a shallow and high-energy environment. It is dominated by large favositids accompanied by a few broken pieces of halysitids and small solitary rugose corals. The Dentilasma Association has a pretty high coral diversity, dominated by the solitary rugose coral Dentilasma meitanense, together with some subordinative heliolitids and favositids. The sedimentary evidence shows that this association might live in a quiet and nutritive shallow water environment. The Paraceriaster Association yields in the grayish green calcareous mudstone indicating a comparatively deep water environment. Systematically it contains abundant fasciculate Paraceriaster micropora and a few favositids. The distinction among these three coral associations shows that corals could adopt different adaptive strategies under different environments, which provide some new data for the investigation on the ecology of Silurian corals and further study on the "Lower Red Beds".

关键词： coral associations Baiyun'an Formation Llandovery (Silurian) huaying mountain eastern Sichuan

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