Analysis on sediment provenance and environmental changes in the middle Okinawa Trough

Zhang Dandan; Zeng Zhigang; Yin Xuebo

doi:10.3969/j.issn.0253-4193.2017.07.009

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Zhang Dandan, Zeng Zhigang, Yin Xuebo. Analysis on sediment provenance and environmental changes in the middle Okinawa Trough[J]. Haiyang Xuebao, 2017, 39(7): 92-101. doi: 10.3969/j.issn.0253-4193.2017.07.009

Citation:

Zhang Dandan, Zeng Zhigang, Yin Xuebo. Analysis on sediment provenance and environmental changes in the middle Okinawa Trough[J]. Haiyang Xuebao, 2017, 39(7): 92-101. doi: 10.3969/j.issn.0253-4193.2017.07.009

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Analysis on sediment provenance and environmental changes in the middle Okinawa Trough

doi: 10.3969/j.issn.0253-4193.2017.07.009

1.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China;University of Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2016-10-08
Rev Recd Date: 2016-12-15

Abstract

Abstract

Based on the data of grain size and trace elements coupled with high-precise AMS¹⁴C dating, this paper dealed with the provenance and sediment environment evolution of the middle Okinawa Trough for the last 5 300 a with the sample from the Core HOBAB2-S2. The analysis on REE and trace elements showed their affinities to the terrigenous sediments in the study area. In combination with REE parameters of potential sediment sources, the sediments were mainly originated from Taiwan. The grain size was used to be the indicators of sediment environment, especially the vigor of local current(the current was mainly referred to Kuroshio Current in this paper). The conclusions were summarized as follows. Four periods were divided. During the first period(5.30-3.81 ka BP), grain size was getting finer, which indicated the Kuroshio Current weakened gradually. In the period of 3.18-2.70 ka BP, the garin size showed distinct change and we can deduce that the sediments suffered a relative volatility period. During the third period, from 2.70 ka BP to 0.97 ka BP, the environment was stable inferred from the grain size with little changes. Since 0.97 ka BP, the sediments grain size was larger than before and indicated the enhance of the strength of Kuroshio Current.
- Okinawa Trough,
- provenance,
- trace elements,
- grain size,
- sediment environment

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