Paleoenvironment changes in the northern Okinawa Trough since 88 ka: evidences from element geochemistry

Zhu Aimei; Shi Xuefa; Zou Jianjun; Zhang Hui; Wu Yonghua; Liu Yanguang

doi:10.3969/j.issn.0253-4193.2015.06.006

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Zhu Aimei, Shi Xuefa, Zou Jianjun, Zhang Hui, Wu Yonghua, Liu Yanguang. Paleoenvironment changes in the northern Okinawa Trough since 88 ka: evidences from element geochemistry[J]. Haiyang Xuebao, 2015, 37(6): 58-69. doi: 10.3969/j.issn.0253-4193.2015.06.006

Citation:

Zhu Aimei, Shi Xuefa, Zou Jianjun, Zhang Hui, Wu Yonghua, Liu Yanguang. Paleoenvironment changes in the northern Okinawa Trough since 88 ka: evidences from element geochemistry[J]. Haiyang Xuebao, 2015, 37(6): 58-69. doi: 10.3969/j.issn.0253-4193.2015.06.006

Citation:

Zhu Aimei, Shi Xuefa, Zou Jianjun, Zhang Hui, Wu Yonghua, Liu Yanguang. Paleoenvironment changes in the northern Okinawa Trough since 88 ka: evidences from element geochemistry[J]. Haiyang Xuebao, 2015, 37(6): 58-69. doi: 10.3969/j.issn.0253-4193.2015.06.006

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Paleoenvironment changes in the northern Okinawa Trough since 88 ka: evidences from element geochemistry

doi: 10.3969/j.issn.0253-4193.2015.06.006

1.
Key Laboratory of State Oceanic Administration for Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
2.
Key Laboratory of State Oceanic Administration for Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Qingdao National Laboratory for Marine Science and Technology, Function Laboratory for Marine Geology and Environment, Qingdao 266071, China

Received Date: 2014-06-17

Abstract

Abstract

Based on the analysis of major and minor elements in bulk sediments of core CSH1, we reconstructed the changes of sediment components, hydrodynamic conditions and weathering history in the provenance of terrigenous materials over the last 88 ka in the northern Okinawa Trough. The results show that the lithology of parent rock of the terrigenous detritus is felsic, and the volcanic detritus contributes significantly to the sediment components during MIS 1. Over the last 88 ka, the weathering in the provenance of terrigenous detribus is weak (WIP<60%) but gradually increases since the last deglacial period. The Zr/Nb ratio indicates the hydrodynamic condition was much stronger during MIS 1 and MIS 5.1 in the northern Okinawa trough, a potential indicator of the strength of the Kuroshio, which occurs synchronically with the intensified Kuroshio. The terrigenous contributions significantly increased during lower sea level, while the biogenic contributions showed high values during MIS 1 and MIS 5.1. The sediment components are regulated by the Kuroshio and the runoff in the northern Okinawa Trough, which in fact are controlled by sea level and the East Asian Monsoon.
- elemental geochemistry,
- Kuroshio Current,
- sea level,
- East Asian monsoon,
- northern Okinawa Trough

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