Abstract：Eolian records in marine sediments were suggested to reveal the drying process in dust sources area and the variations of the intensity of monsoon. Here we present the eolian records since~80ka deduced from grain size and rock magnetic analysis of a sediments core(Core MABC19)near the Caiwei Seamounts,Western Pacific. The chronostratigraphy of the core was constructed by the relative palaeointensity(RPI)of the earth’s magnetic field. According to the variations of the high coercivity magnetic mineral parameters,the eolian input into the study area increase gradually since~80ka,and reach relatively high level during the MIS3/MIS2 transition,indicating the variations in palaeoclimate and palaeoenvironment conditions in the dust source area. The average grain size of eolian component derived from grain size-standard deviation method is used as an indicator of the intensity of East Asian winter monsoon(EAWM). The average grain size data reveals a significant increase of EAWM during the MIS3/MIS2 transition,which is highly consistent with the variation of EAWM intensity indicated by loess during MIS3 stage. However,differentiation is apparent in the rest periods. The maritime-continental contrast of the dust transportation mechanism at high altitude is likely to contribute to this difference.
Xie Yi-Xuan,Yang Xiao-Qiang,Zhang Huo-Dai et al. Eolian input and East Asian winter monsoon records in deep-sea sediment from Western Pacific since ~80ka[J]. JOPC, 2019, 21(5): 855-868.
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