Assemblage characteristics of clay minerals and its implications to evolution of eolian dust input to the Parece Vela Basin since 1.95 Ma |
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Authors: | Jie Ming Anchun Li Jie Huang Shiming Wan Qingyong Meng Fuqing Jiang Wenwen Yan |
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Institution: | 1. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China 2. University of Chinese Academy of Sciences, Beijing, 100049, China 3. First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China
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Abstract: | To understand the provenance and evolution of eolian input in the last 1.95 Ma in the Parece Vela Basin in the eastern Philippine Sea, the clay mineral assemblage of a gravity core PV090510 from the basin was investigated using paleogeomagnetic dating and X-ray diffraction. The assemblage of the core mainly consisted of smectite (~46%) and illite (~40%), with some chlorite (~10%) and kaolinite (~4%). Analysis of the provenance of these minerals suggested that smectite was mainly derived from volcanic rocks of the Mariana Arc, while illite, chlorite, and kaolinite were mainly transported as eolian dust by the East Asian monsoon from central Asia. We used the ratio of (illite+chlorite+kaolinite)/smectite as a proxy for Asian eolian input to the Parece Vela Basin since 1.95 Ma. This ratio followed glacial and interglacial cycles and was consistent with the intensity of the East Asian monsoon and aridity of central Asia since 1.95 Ma. The changes of the ratio reflected three different stages of the East Asian monsoon and provenance climate. |
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Keywords: | eolian dust East Asian winter monsoon clay mineral provenance Parece Vela Basin |
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