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Clay mineral and grain size studies of sediment provenances and paleoenvironment evolution in the middle Okinawa Trough since 17 ka
Wang, Jiaze1,2,3; Li, Anchun1; Xu, Kehui3,4; Zheng, Xufeng1; Huang, Jie1
2015-08-01
发表期刊MARINE GEOLOGY
卷号366页码:49-61
文章类型Article
摘要Okinawa Trough receives a large amount of fluvial sediment transported by complex oceanographic circulations, and is an ideal location for the study of paleoceanography and paleoenvironment changes. However, our knowledge of the sediment provenance and paleoenvironment evolution in the Trough during the past 17 ka is still limited. Based on high-resolution grain size, clay minerals and AMS C-14 data of the Core OKI04, we present new evidences of the provenances and paleoenvironment evolution in the middle Okinawa Trough during the last 17 ka. Our results indicate that clay-sized terrigenous sediment deposited in the middle Okinawa Trough is mainly from those rivers flowing into East China Sea and Yellow Sea (e.g., Yangtze and Yellow Rivers) and Taiwanese Rivers. Their contributions varied greatly in space and time during the past 17 ka. From 16.5 to 13.8 ka, sediment was mainly derived from the Yangtze and Yellow Rivers, with little contribution from Taiwan. From 13.8 to 5.4 ka, the contributions from the Yangtze and Yellow Rivers oscillated multiple times: low in 13.8-11.6 ka, high in 11.6-7.6 ka, and back to low in 7.6-5.4 ka, whereas the pattern of Taiwanese contribution was opposite. After 5.4 ka when the sea level was high and shoreline was far away from the Okinawa Trough, the Yangtze River and eastern Taiwanese Rivers became the main provenances. The contribution from the Yellow River decreased, which is probably because Yellow River mouth was far away from the middle Trough. Sediment grain size data show that two environmentally sensitive populations are 71-7 mu m and 7-0.5 mu m. The variation of the populations' mean grain size and content shows that the strength of Kuroshio Current was weak during 16.5-11.6 ka, and became strong in 11.6-5.4 ka, in which Tsushima Warm Current and Yellow Sea Warm Current formed around 8.5 and 6.5 ka, respectively. The strength of Kuroshio Current decreased in 5.4 ka and increased since 3.2 ka. Based on clay mineralogical analysis, we find that the kaolinite/chlorite could be used as a new effective indicator for the East Asian Winter Monsoon's evolution in the Trough since 17 ka. (C) 2015 Elsevier B.V. All rights reserved.
关键词Grain Size Clay Minerals Sediment Provenance Kuroshio Current East Asian Winter Monsoon Okinawa Trough
DOI10.1016/j.margeo.2015.04.007
收录类别SCI
语种英语
WOS记录号WOS:000356546100004
引用统计
被引频次:18[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/33083
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Louisiana State Univ, Dept Oceanog & Coastal Sci, Baton Rouge, LA 70803 USA
4.Louisiana State Univ, Inst Coastal Studies, Baton Rouge, LA 70803 USA
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Wang, Jiaze,Li, Anchun,Xu, Kehui,et al. Clay mineral and grain size studies of sediment provenances and paleoenvironment evolution in the middle Okinawa Trough since 17 ka[J]. MARINE GEOLOGY,2015,366:49-61.
APA Wang, Jiaze,Li, Anchun,Xu, Kehui,Zheng, Xufeng,&Huang, Jie.(2015).Clay mineral and grain size studies of sediment provenances and paleoenvironment evolution in the middle Okinawa Trough since 17 ka.MARINE GEOLOGY,366,49-61.
MLA Wang, Jiaze,et al."Clay mineral and grain size studies of sediment provenances and paleoenvironment evolution in the middle Okinawa Trough since 17 ka".MARINE GEOLOGY 366(2015):49-61.
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