Mineralogy, geochemistry, and sulfur isotope characteristics of sediment-hosted hydrothermal sulfide minerals from the southern Okinawa Trough

Yamin Yang; Zhigang Zeng; Xuebo Yin; Xiaoyuan Wang; Shuai Chen; Haiyan Qi; Zuxing Chen; Bowen Zhu

doi:10.1007/s13131-021-1836-9

Volume 40 Issue 10

Oct. 2021

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Yamin Yang, Zhigang Zeng, Xuebo Yin, Xiaoyuan Wang, Shuai Chen, Haiyan Qi, Zuxing Chen, Bowen Zhu. Mineralogy, geochemistry, and sulfur isotope characteristics of sediment-hosted hydrothermal sulfide minerals from the southern Okinawa Trough[J]. Acta Oceanologica Sinica, 2021, 40(10): 129-143. doi: 10.1007/s13131-021-1836-9

Citation:

Yamin Yang, Zhigang Zeng, Xuebo Yin, Xiaoyuan Wang, Shuai Chen, Haiyan Qi, Zuxing Chen, Bowen Zhu. Mineralogy, geochemistry, and sulfur isotope characteristics of sediment-hosted hydrothermal sulfide minerals from the southern Okinawa Trough[J]. Acta Oceanologica Sinica, 2021, 40(10): 129-143. doi: 10.1007/s13131-021-1836-9

Citation:

Yamin Yang, Zhigang Zeng, Xuebo Yin, Xiaoyuan Wang, Shuai Chen, Haiyan Qi, Zuxing Chen, Bowen Zhu. Mineralogy, geochemistry, and sulfur isotope characteristics of sediment-hosted hydrothermal sulfide minerals from the southern Okinawa Trough[J]. Acta Oceanologica Sinica, 2021, 40(10): 129-143. doi: 10.1007/s13131-021-1836-9

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Mineralogy, geochemistry, and sulfur isotope characteristics of sediment-hosted hydrothermal sulfide minerals from the southern Okinawa Trough

doi: 10.1007/s13131-021-1836-9

Yamin Yang^{1, 3},
Zhigang Zeng^{1, 2, 3, 4
,
,},
Xuebo Yin¹,
Xiaoyuan Wang¹,
Shuai Chen¹,
Haiyan Qi¹,
Zuxing Chen¹,
Bowen Zhu^{1, 3}

1.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China
4.
Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China

Funds: The National Natural Science Foundation of China under contract No. 91958213; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDB42020402; the National Programma on Global Change and Air-Sea Interaction under contract No. GASI-GEOGE-02; the International Partnership Program of the Chinese Academy of Sciences under contract No. 133137KYSB20170003; the Special Fund for the Taishan Scholar Program of Shandong Province under contract No. ts201511061; the National Key Basic Research Program of China under contract No. 2013CB429700.

More Information

Corresponding author: E-mail: zgzeng@ms.qdio.ac.cn
Received Date: 2020-10-25
Accepted Date: 2021-03-26

Available Online: 2021-09-18

Publish Date: 2021-10-30

Abstract

Abstract

Studies of the mineralogy and sulfur isotope composition of sediment-hosted hydrothermal sulfide minerals in cores are important for understanding the seafloor mineralization environment and material source and reconstructing the hydrothermal history. However, the source of ore-forming materials and the history of hydrothermal activity in the southern Okinawa Trough (SOT) remain unclear. Here, the mineralogy and sulfur isotope characteristics of sulfides from gravity core HOBAB4-S2, collected between the Yonaguni Knoll IV hydrothermal field (HF) and the Tangyin HF, was investigated. Enrichments in Zn (up to 321×10⁻⁶), Cu (up to 73.7×10⁻⁶), and Pb (up to 160×10⁻⁶) and the presence of pyrite, galena, pyrrhotite and minor sphalerite and chalcopyrite provide evidence for the input of hydrothermal materials into the sediments. The pyrite morphologies include disseminated cubic, pentagonal dodecahedron, and framboidal forms. Except for minor framboidal pyrite, euhedral pyrite from core HOBAB4-S2 is mainly of hydrothermal origin with Co/Ni ratios >1 and S/Fe atomic ratios <2 in the Cu-Zn-Pb-rich layers. The occurrences of hexagonal pyrrhotite, high-Co (up to 0.17%) pyrite and high-Fe sphalerite indicate that the hydrothermal precipitates formed at medium-high temperatures and low-sulfur fugacity (fS₂) environments. The δ³⁴S values of sulfides (0.21‰–3.45‰) with low- fS₂ mineral assemblages (e.g., pyrrhotite ± high-Fe sphalerite) in the core are significantly lower than those of magmatic rocks and seawater, indicating possible incorporation of previously formed biogenic sulfur in the sediment. Combined with the age model of the core, it is suggested that hydrothermal activity likely began in the Tangyin HF before AD 1445–1483 and that at least three active episodes may have occurred since then.
- mineralogy,
- sulfur isotopes,
- sediment-hosted hydrothermal sulfides,
- southern Okinawa Trough

Yang Yamin, Zeng Zhigang, Liu Xiting, et al. Fine-grained turbidites in the southern Okinawa Trough and its implication for earthquakes activity in the past 700 years. Geological Journal (Major revision).

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References(102)

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