Sedimentary responses to the Indian Summer Monsoon variations recorded in the southeastern Andaman Sea slope since 26ka

作者: Peng Cao , Xuefa Shi , Weiran Li , Shengfa Liu , Zhengquan Yao

DOI: 10.1016/J.JSEAES.2015.06.028

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摘要: Abstract Paleoenvironment and paleoclimate change in the Andaman Sea during last 26 ka were reconstructed from high-resolution records of grain-size, major elements Sr–Nd isotopes core ADM-9. The values eNd(0) 87Sr/86Sr good agreement with those Irrawaddy River sediments, indicating a common source origin. Two sensitive grain-size intervals (3.4–7.5 16.8–21.2 μm) identified; former was controlled primarily by sea-level change, whereas latter related to discharge South-west Current transport driven Indian Summer Monsoon (ISM). Proxies chemical weathering (K/Al) terrigenous input (Ti/Ca) coupled interval (16.8–21.2 μm population) revealed that ISM weak ∼15–26 ka BP then strengthened gradually maximum ∼7–9 ka BP; subsequently, exhibited generally declining trend ∼2 ka BP. variation recorded this work is consistent variations observed an open area northern Ocean adjacent continents, implying evolution Asia since 26 ka.

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