By quantifying the deposition of Asia-derived dust in the Western Pacific Ocean it is possible to constrain the consequences of climate change in East Asia. However, the rates of eolian dust deposition and its transport mechanism in the low-latitude Pacific remain uncertain. Core CP19 recovered sediment dating from ∼1 Ma to the present in the Parece Vela Basin (PVB). In this study we present bulk-rock major and trace element geochemistry, and Sr and Nd isotopic compositions from this sediment. The results reveal that these clastic sediments are a mixture of volcanic materials derived from the adjacent island arcs and eolian dust material originating from the arid regions of East Asia. Within the PVB, the proportion of Asian dust in the detrital sediment ranges from 30% to 50%, with an average of 44%. The majority of the dust originated from Eastern Asian deserts. Sr and Nd isotopes indicate that there is a significant increase in the overall proportion of eolian dust in the PVB starting at ∼0.64 Ma, influenced by an enhanced East Asian winter monsoon. In contrast, strengthening of the East Asian summer monsoon led to a decrease in the proportion of the eolian dust from the Ordos deserts. The notable alteration in eolian dust flux to the PVB corresponds to an abrupt intensification of aridity and monsoon climate in the East Asian continent at ∼0.64 Ma, caused by the Middle Pleistocene Climate Transition.

中文翻译：

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过去 1 Ma 亚洲沙尘对帕雷塞维拉盆地沉积物收支的贡献：对东亚气候变化的影响

通过量化西太平洋亚洲尘埃的沉积量，可以限制东亚气候变化的后果。然而，低纬度太平洋风尘沉积速率及其输送机制仍不确定。岩心 CP19 回收了 Parece Vela 盆地 (PVB) 距今 1 Ma 至今的沉积物。在这项研究中，我们介绍了来自该沉积物的块岩主量和微量元素地球化学以及 Sr 和 Nd 同位素组成。结果表明，这些碎屑沉积物是来自邻近岛弧的火山物质和来自东亚干旱地区的风成尘物质的混合物。在PVB内，碎屑沉积物中亚洲沙尘的比例为30%至50%，平均为44%。大部分灰尘来自东亚沙漠。 Sr和Nd同位素表明，受东亚冬季风增强的影响，从~0.64 Ma开始，PVB中风尘的总体比例显着增加。相比之下，东亚夏季风的加强导致鄂尔多斯沙漠的风尘比例减少。 PVB 风尘通量的显着变化对应于东亚大陆 0.64 Ma 的干旱和季风气候的突然加剧，这是由中更新世气候转变引起的。