Sulfur isotopic systematics of hydrothermal precipitates in the Okinawa Trough: Implication for the effect of sediments and magmatic volatiles

doi:10.1016/j.chemgeo.2023.121864

IOCAS-IR > 海洋地质与环境重点实验室

	Sulfur isotopic systematics of hydrothermal precipitates in the Okinawa Trough: Implication for the effect of sediments and magmatic volatiles
	Wang, Hao 1; Li, Zhenggang 1; Fu, Bin 2,3; Li, Jie1 ; Chu, Fengyou 1; Dong, Yanhui 1; Zhu, Jihao 1; Zhu, Zhimin 1; Chen, Ling 1; Li, Xiaohu 1
	2024-01-20
发表期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
卷号	644 页码:18
通讯作者	Wang, Hao([email protected]) ; Li, Xiaohu([email protected])
摘要	The Okinawa Trough is a sediment-covered intra-continental back-arc basin with active hydrothermal activities. The sulfur isotopic systematics of the hydrothermal systems in the Okinawa Trough remain unclear owing to the complex sulfur reservoirs. To address these uncertainties, we conducted in situ S isotopic combined with whole-rock geochemical, Pb isotopic, and barite Sr isotopic analyses of typical hydrothermal precipitates from three hydrothermal fields with varying sediments thickness (Iheya North Knoll (INK) < Yonaguni Knoll IV (YK) < Noho) in the Okinawa Trough. The delta S-34 values of barite from INK (+16.4 parts per thousand to +19.6 parts per thousand, median + 18.5 parts per thousand) and YK (+16.2 parts per thousand to +22.2 parts per thousand, median + 19.5 parts per thousand) mostly indicate lower values than those obtained for seawater (- +21 parts per thousand), combined with the observation of high S and O fugacity (fO(2)-fS(2)) mineral assemblages (e.g., low-Fe sphalerite +/- enargite +/- tennantite +/- chalcopyrite), and high Cu and Au contents of hydrothermal precipitates, consistent with the addition of magmatic volatile to these two fields. In contrast, the in situ delta S-34 values of sulfide minerals from INK (+5.6 parts per thousand to +10.4 parts per thousand, median + 9.0 parts per thousand) and YK (+3.5 parts per thousand to +5.5 parts per thousand, median + 4.7 parts per thousand) fields were all positive, inconsistent with the S isotopic characteristics of H2S formed from SO2 disproportionation. We conclude that a large proportion of thermochemical SO42- reduction-derived heavy sulfur likely obscure the characteristics of H2S sourced from disproportionation. This was likely resulting from (1) sediment controlled long-scale lateral hydrothermal circulation, (2) the existence of early precipitated anhydrite, and (3) high concentrations of H-2 in the high-temperature reaction zone. The Noho field have low delta S-34 values (-0.2 parts per thousand to +5.3 parts per thousand, median + 0.9 parts per thousand) of sulfide minerals, combined with high sediment contributions reflected by high Pb isotopic ratios and low-fS(2)-fO(2) mineral assemblages (e.g., high-Fe sphalerite +/- pyrrhotite +/- isocubanite), which indicates that the low delta S-34 value sulfur was derived from leaching of biogenic pyrite in thick sedimentary strata by hydrothermal fluid. Near surface, the high-temperature discharging hydrothermal fluids interacted with different thicknesses of sedimentary strata and leached different proportions of biogenetic pyrite, resulting in a negative correlation of sedimentary strata thickness and sulfide delta S-34 values of the Okinawa Trough hydrothermal fields.
关键词	Hydrothermal field In situ sulfur isotope Magmatic volatiles Okinawa Trough
DOI	10.1016/j.chemgeo.2023.121864
收录类别	SCI
语种	英语
资助项目	Chinese Natural Science Foundation[41903046]; Chinese Natural Science Foundation[U2244222]; Chinese Natural Science Foundation[41830540]; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2019KG09]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001137484000001
出版者	ELSEVIER
WOS关键词	BACK-ARC BASIN ; MASSIVE SULFIDE DEPOSITS ; EASTERN MANUS BASIN ; MID-ATLANTIC RIDGE ; IHEYA NORTH ; GUAYMAS BASIN ; GOLD MINERALIZATION ; FLUID GEOCHEMISTRY ; SULFATE REDUCTION ; ELEMENTAL SULFUR
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/184345
专题	海洋地质与环境重点实验室
通讯作者	Wang, Hao; Li, Xiaohu
作者单位	1.Minist Nat Resources, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou 310012, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 3.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200A2, Australia
推荐引用方式 GB/T 7714	Wang, Hao,Li, Zhenggang,Fu, Bin,et al. Sulfur isotopic systematics of hydrothermal precipitates in the Okinawa Trough: Implication for the effect of sediments and magmatic volatiles[J]. CHEMICAL GEOLOGY,2024,644:18.
APA	Wang, Hao.,Li, Zhenggang.,Fu, Bin.,Li, Jie.,Chu, Fengyou.,...&Li, Xiaohu.(2024).Sulfur isotopic systematics of hydrothermal precipitates in the Okinawa Trough: Implication for the effect of sediments and magmatic volatiles.CHEMICAL GEOLOGY,644,18.
MLA	Wang, Hao,et al."Sulfur isotopic systematics of hydrothermal precipitates in the Okinawa Trough: Implication for the effect of sediments and magmatic volatiles".CHEMICAL GEOLOGY 644(2024):18.