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- W2386587112 abstract "Detailed geologic mapping and bore data was conducted to study on the Quaternary tectonic and sedimentary characteristics and environmental evolution of Anxiang Sag and its west periphery of Dongting Basin,which provided new materials for Quaternary geology of Jianghan-Dongting Basin.The sag trends north-south direction and is surrounded by normal faults.The thickness of Quaternary deposits in the sag is commonly 100-220 m with maximun thickness of 300 m,and from lower to upper,the Quaternary strata is composed of Early Pleistocene Huatian Formation and Miluo Formation,Middle Pleistocene Dongtinghu Formation,Late Pleistocene Potou Formation and Holocene lacustrine-alluvial deposits.Quaternary deposits in the sag are mainly gravel and sand,and secondly silt-bearing clay,silty clay and clay,while there exists distinct lateral lithological and lithofacies variation.In west periphery of Anxiang Sag,namely east margin of Taiyangshan uplift,there exists low hills with the earth's surface inclining east clearly,and there occurs Middle Pleistocene Baishajing Formation which is composed of sands and gravels in the lower and clay in the upper of the south,and mainly silty-clay in the north.Based on geomorphologic,sedimentary and sag-controling fault characteristics,evolution of the Quaternary tectonic and environment of the study area is defined.During early Middle Pleistocene,NNE-trending Zhoujiadian fault at the west boundary of Anxiang Sag extended and the sag subsided unevenly with deposits were formed in rivers and river like flowing lakes;in the same time the west periphery of Anxiang Sag rose and was denudate.During Middle Pleistocene faulted subsidence expanded westward,when the environment of the sag liked flowing lake,and the environment of southern and northern segment of the west periphery was river and lake,respectively.The sag and its west periphery rose as a whole during late Middle Pleistocene,when there occurred eastward tilt in west periphery.During Late Pleistocene Anxiang Sag subsided for depression and the environment was of river and lake;in the same time the west periphery was denuded.At the end of Late Pleistoncene regional sea-level dropped,which caused Anxiang Sag denudated. The sag subsided and the environments were river and lake in flood plain during Holocene." @default.
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- W2386587112 date "2010-01-01" @default.
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- W2386587112 title "Quaternary Tectonic-sedimentary Characteristics and Environmental Evolution of Anxiang Sag in Dongting Basin and Its West Periphery" @default.
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