Rare earth element and Sr-Nd isotopic characteristics of the sediments in Antarctic Cosmonaut Sea and their provenance significances since the late Middle-Holocene

Zhang Yongcong; Hu Liangming; Sun Xi; Han Xibin; Long Feijiang; Wu Wendong; Xiang Bo; Wang Yizhuo; Ge Qian; Bian Yeping

doi:10.12284/hyxb2023076

Volume 45 Issue 5

May 2023

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Zhang Yongcong，Hu Liangming，Sun Xi, et al. Rare earth element and Sr-Nd isotopic characteristics of the sediments in Antarctic Cosmonaut Sea and their provenance significances since the late Middle-Holocene[J]. Haiyang Xuebao，2023, 45(5)：14–26 doi: 10.12284/hyxb2023076

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Rare earth element and Sr-Nd isotopic characteristics of the sediments in Antarctic Cosmonaut Sea and their provenance significances since the late Middle-Holocene

doi: 10.12284/hyxb2023076

Zhang Yongcong^{1, 2
,},
Hu Liangming^{1, 2},
Sun Xi^{1, 2},
Han Xibin^{1, 2
,
,},
Long Feijiang³,
Wu Wendong⁴,
Xiang Bo³,
Wang Yizhuo³,
Ge Qian^{1, 2},
Bian Yeping^{1, 2}

1.
Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China
2.
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
3.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
4.
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received Date: 2022-09-22
Rev Recd Date: 2022-10-17

Available Online: 2023-06-13

Publish Date: 2023-05-01

Abstract

Abstract

Carrying out researches on marine sediments’ source can help to better understand the mechanism of material transport and the process of regional and global material circulation. A sediment provenance study has been conducted by analyzing the rare earth element and Sr-Nd isotopes of the ANT36-C4-05 core sediment in the Cosmonaut Sea, Antarctic. The results show that the average content of rare earth element (REE) in the sediment is relatively high, with an obvious fractionation between light REE (LREE) and heavy REE (HREE); and the average ⁸⁷Sr/⁸⁶Sr value of the sediment is relatively high, while the average εNd(0) value is significantly negative. The REE and Sr-Nd isotopic characteristics indicate that since the late Middle-Holocene, the sediment is mainly originated from high-grade metamorphic rocks in the vicinity of the Prydz Bay and Enderby Land, East Antarctic. These detrital materials are partly introduced into the Cosmonaut Sea under the ice-sea interaction, with the Antarctic Coastal Current and Antarctic Slope Current playing important roles in the transportation; simultaneously, it may also rely on katabatic winds originating from the Antarctic interior plateau to complete the transport process from source areas to the study area. The results of the provenance end member mixing model show that the sediment is mainly originated from metamorphic rocks in the Prydz Bay area (>70%), while the contribution from Enderby Land is relatively small. The significant difference in the contribution of two source areas is related to the differences in glaciers, ocean currents, and wind forces between two areas: compared to Enderby Land, the glacier in the Prydz Bay area is larger in scale and moves at a faster speed, with a stronger erosive and transport capacity for the bedrock; in the meanwhile, the Antarctic Bottom Water originating from the bottom of the Prydz Bay area may play an important role during the westward transportation; and the Prydz Bay area is one of the stronger wind force regions of katabatic winds, which can contribute more bedrock debris to downwind areas, for example the Cosmonaut Sea. These factors result in the characteristic of the ANT36-C4-05 core sediment in the Cosmonaut Sea which is mainly from the Prydz Bay area.
- REE,
- Sr-Nd isotopes,
- Cosmonaut Sea,
- dust,
- provenance end member

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References(80)

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