Sediment provenances and environmental changes in the southeastern Scotia Sea, Antarctica, since the Last Glaciation

Feng Zongbao; Chen Zhihua; Yang Chunli; Huang Yuanhui; Cui Yingchun; Tang Zheng; Liu Yanguang

doi:10.12284/hyxb2023105

Volume 45 Issue 7

Jul. 2023

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Feng Zongbao，Chen Zhihua，Yang Chunli, et al. Sediment provenances and environmental changes in the southeastern Scotia Sea, Antarctica, since the Last Glaciation[J]. Haiyang Xuebao，2023, 45(7)：56–68 doi: 10.12284/hyxb2023105

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Sediment provenances and environmental changes in the southeastern Scotia Sea, Antarctica, since the Last Glaciation

doi: 10.12284/hyxb2023105

Feng Zongbao^{1, 2
,},
Chen Zhihua^{1, 2
,
,},
Yang Chunli³,
Huang Yuanhui¹,
Cui Yingchun⁴,
Tang Zheng^{1, 2},
Liu Yanguang^{1, 2}

1.
Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Marine Geology, Pilot National Laboratory of Marine Science and Technology (Qingdao), Qingdao 266061, China
3.
First Exploration Team of Shandong Coalfield Geology Bureau, Qingdao 266500, China
4.
China Polar Research Center, Shanghai 200136, China

Received Date: 2022-12-17
Rev Recd Date: 2023-01-15

Available Online: 2023-08-02

Publish Date: 2023-07-01

Abstract

Abstract

Rare earth elements (REE) and their relationships with biogenic silica (BSiO₂), magnetic susceptibility, Al₂O₃ and Fe₂O₃ in Core DC-11 were analyzed to reveal sediment provenances and transport history by iceberg-current-atmosphere since 34 ka BP in the southeastern Scotia Sea, Antarctica. Temporal variation of REE is similar to that of Al₂O₃, indicating they mainly occur in terrigenous detritus and BSiO₂ has obvious dilution effect on them. Sediments with high REE concentration, flat shale-normalized pattern, weak positive Eu anomaly, and high La_N/Yb_N ratio during the last glacial period indicated they are transferred from the Weddell Sea and eroded from the bordering lands with relatively old crust. The increases in magnetic susceptibility, ΔAl₂O₃, TFe₂O₃/Eu ratio indicated an enhanced input of dust from South America during this period. In early Deglaciation (19.6−14.1 ka BP), increasing Eu positive anomaly and lower La_N/Yb_N ratio indicated the southern branch of Antarctic Circumpolar Current (ACC) strengthened and contributed more sediments from the South Shetland Islands and Antarctic Peninsula due to the southward shifts of oceanic fronts, while decreasing magnetic susceptibility, ΔAl₂O₃, TFe₂O₃/Eu ratios showed rapid decrease in dust supply from South America. During the Antarctic Cold Reversal period (ACR, 14.1−12.9 ka BP), sediments from the South Shetland Islands and Antarctic Peninsula decreased sharply due to cold condition and weakened ACC branch, the weakest Eu positive anomaly and highest La_N/Yb_N ratio indicated that the sediments from the Weddell Sea dominated in the core again, and the peak of ice raft debris indicated ice rafting is vital or dominant agent. In the late Deglaciation (12.9−11.7 ka BP), the return of ACC branch to the South Shetland Islands and Antarctic Peninsula contributed more to the sediments in Core DC-11; in Holocene (11.7−0 ka BP), the ACC branch in the area between the South Shetland Islands and Antarctic Peninsula was generally enhanced, and its contribution to core sediments increased to be roughly equivalent to the amount of sediments from the Weddell Sea.
- Antarctic,
- Scotia Sea,
- rare earth elements,
- sediment provenances,
- environmental changes

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References(63)

References

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