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Coupling controls of neotec-tonism and paleoclimate on the Quaternary sediments of the Yangtze (Changjiang) coast

Science Bulletin 2005年第16期 105-114页

作者： wang zhangjiao1,{1., wei zixin3. wang zhanghua1 & wei taoyuan1 1. department of geography, east china normal university, shanghai 200062, china 2. State Key laboratory for Estuarine and Coastal Research, east china normal university, shanghai 200062, china 3. shanghai Institute of Geological Survey, shanghai 200072, china

Attempt has been made to discuss the coupling relation of neotectonism and paleoclimate that have played a critical role in controlling the Quaternary sediment distribu-tion and sedimentary facies evolution on the Yangtze coast. On the basis of petrological analysis, up to six sedimentary cyclicities have been identified in the Quaternary sediment boreholes on the time scale of 0.4―0.5 Ma. The lower sedi-mentary cyclicities (Pliocene to Early Pleistocene) are char-acterized largely by thicker gravelly coarse sands, topped by thinner fine silt and silty clay. Gravels are very angular and clayey gravels prevail. Sediments are usually of poor sorting, rich in log fragments and have no microfossils. Bedload as denoted by C-M plot occurs throughout the section. This evidence represents the alluvial fan sedimentation which took place as the basin began to subside. The middle sedimentary cyclicities (often including Early to Middle Pleistocene) con-sist of basal gravelly sands and clayey silt at the middle and upper sediment sections. Sorting becomes relatively better, and foraminifer appears sporadically. C-M plot reveals the mixture of sediment transport media via bedload, saltation and suspension, representing sedimentation of braided river system at the early stage and subsequently, the sedimentation of meandering river pattern. The upper sedimentary cyclic-ities (including Late Pleistocene to Holocene) comprise basal gravelly sands (exclusive of the Holocene sediment) and thick fine sand and silty clay on the upper section. Sorting becomes fine and foraminifer appears throughout the sediment sec-tion. C-M plot shows that saltation and suspension serve as the main sediment transport media in the sediment section and bedload transport weakens. These evidence the sedi-mentation of meandering river pattern near coast during Late Pleistocene and Holocene time, when marine transgres-sion invaded into the paleoriver valleys, which often forms drowned-valley facies and shallo

关键词： Quaternary sediments grain size neotectonic subsidence paleoclimate/sea-level fluctuations Yangtze delta.

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Coupling controls of neotec-tonism and paleoclimate on the Quaternary sediments of the Yangtze (Changjiang) coast

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Chinese Science Bulletin 2005年第16期50卷 1775-1784页

作者： wang {1. chen zhongyuan wei zixin wang zhanghua wei taoyuan department of {1. East China Normal University Shanghai200062 China State Key laboratory for Estuarine and Coastal Research East ChinaNormal University Shanghai 200062 China shanghai Institute of Geological Survey Shanghai 200072 China

关键词：扬子江流域地质气候沉积物谷物生理特性

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