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- W2352168276 abstract "The chemical weathering of silicate rocks in continents as an important sink of atmospheric CO2 is of great signicance for global environmental change.The chemical index of alteration( CIA) has been widely used as a proxy for chemical weathering in sediment source area. This study presents combined clay minerals and major elements analyses on bulk sediments from a 71-m-long core with high sedimentation rate from northern South Yellow Sea and containing a Late Pleistocene record. After examining the variations of clay minerals and major elements compositions of the core sediment,we develop clay minerals and geochemical proxies to identify the origins of the DLC70-3 Core sediments,especially to discriminate the Yangze River-derived and Yellow River-derived sediment provenances. Furthermore,CIA indices are also applied to decipher the chemical weathering record in sediment source area.Results show that combination of clay minerals is given priority to illite,followed by smectite,with low chlorite and kaolinite. In the vast majority of samples the ratios of illite to smectite is less than 6,indicating that the sediments are mainly transported by the Yellow River.The research suggests that the chemical weathering index( CIA) of the sediment in DLC70-3Core is controlled together by the sea level change and the climate change of the source area,of which the latter one is the major controlling factor. However,the mechanical sedimentary differentiation caused by the sea level change might have affects CIA values at the depth of 27.80 ~ 38.00 m corresponding to MIS 4 of coarse grained sediments greatly. CIA values reveal that during MIS 5 and MIS 3 the continental chemical weathering is relatively strong,which is consistent with the trend of summer monsoon and chemical weathering index of the inland Loess Plateau area,especially in the early stage of the MIS 3( 40 ~ 60 ka),the record of chemical weathering is very strong,which reflects a strong summer monsoon rainfall process in the Yellow River basin. Although the high resolution paleoenvironmental changes can not be easily reconstructed due to ubiquitous unconformity in the sedimentary strata and weak age controls compared to the deep sea sedimentation,the present study sheds new lights on the understanding of the East Asian palaeomonsoon activity in the Yellow River Basin." @default.
- W2352168276 created "2016-06-24" @default.
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- W2352168276 date "2014-01-01" @default.
- W2352168276 modified "2023-09-23" @default.
- W2352168276 title "Chemical Weathering Recorded by Major Element of Northern South Yellow Sea since Late Pleistocene" @default.
- W2352168276 hasPublicationYear "2014" @default.
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