Geochemical records of hydrothermal fluids in corals: Evidence of rare earth elements from coral reefs in the Yongxing Island, Xisha, South China Sea

WEI Haotian; LIU Gang; HAN Xiaohui; ZHAO Yanyan; WU Jiaqing; YANG Jun

doi:10.16562/j.cnki.0256-1492.2019121601

2020 Vol. 40, No. 4

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Article navigation > Marine Geology & Quaternary Geology > 2020 > 40(4): 78-95

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WEI Haotian, LIU Gang, HAN Xiaohui, ZHAO Yanyan, WU Jiaqing, YANG Jun. Geochemical records of hydrothermal fluids in corals: Evidence of rare earth elements from coral reefs in the Yongxing Island, Xisha, South China Sea[J]. Marine Geology & Quaternary Geology, 2020, 40(4): 78-95. doi: 10.16562/j.cnki.0256-1492.2019121601

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WEI Haotian, LIU Gang, HAN Xiaohui, ZHAO Yanyan, WU Jiaqing, YANG Jun. Geochemical records of hydrothermal fluids in corals: Evidence of rare earth elements from coral reefs in the Yongxing Island, Xisha, South China Sea[J]. Marine Geology & Quaternary Geology, 2020, 40(4): 78-95. doi: 10.16562/j.cnki.0256-1492.2019121601

Geochemical records of hydrothermal fluids in corals: Evidence of rare earth elements from coral reefs in the Yongxing Island, Xisha, South China Sea

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2.
Key Laboratory of Submarine Geosciences and Prospecting Technique, Ministry of Education; Institute for Advanced Ocean Study, Ocean University of China, Qingdao 266100, China
3.
Marine Geological Survey Institute of Hainan Province, Key Laboratory of Marine Geological Resources and Environment of Hainan Province, Haikou 570206, China
4.
Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China

More Information

Corresponding author: ZHAO Yanyan, zhaoyanyan@ouc.edu.cn

Received Date: 16 December 2019

Revised Date: 12 February 2020

Publish Date: 25 August 2020

Abstract

Abstract

The contents, distribution pattern and elemental anomalies of rare earth elements in carbonates are the records of surrounding water. Corals are characterized by high resolution and high stability of rare earth elements and may faithfully record the geochemical characteristics of the surrounding seawater. In this paper, we analyzed the coral reefs from 142 to 84 ka collected from the Yongxing Island of the Xuande Atoll of Xisha Islands, South China Sea. Trace element contents, especially the rare earth element contents and their distribution patterns are used in this paper to determine the characteristics of the sea water, in which the coral reefs grew. Results show that, since 142 ka, most of the coral reefs in the Yongxing Island has a normal rare earth element distribution pattern of marine carbonates, characterized by LREE depletion, negative Ce anomalies and high Y/Ho ratios, indicating an environment of open shallow sea. In contrast, the coral skeletons in depth of 23 m 114 ka have similar LREE depletion, negative Ce anomalies and high Y/Ho ratios, but positive Eu anomalies. This suggests that certain amount of hydrothermal fluid has been input during the growth of corals. Based on the model calculations, it is inferred that at least 0.1% of hydrothermal fluid has been added to the open seawater during that time. The hydrothermal fluids may be related to the volcanic activities observed at Gaojianshi island or Hainan island.
- coral /
- rare earth element /
- Eu anomaly /
- hydrothermal solution /
- South China Sea

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References

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