S, Pb, and Fe isotope compositions of sulfides in middle and southern Okinawa Trough: Implying the complicated hydrothermal systems in back-arc spreading centers

doi:10.1016/j.dsr.2023.104006

	S, Pb, and Fe isotope compositions of sulfides in middle and southern Okinawa Trough: Implying the complicated hydrothermal systems in back-arc spreading centers
	Wang, Shujie 1,2; Sun, Weidong1,2,3,4,5 ; Huang, Jing 1,2,3,4; Zhai, Shikui 6
	2023-05-01
发表期刊	DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
ISSN	0967-0637
卷号	195 页码:12
通讯作者	Huang, Jing([email protected])
摘要	Sulfur, lead, and iron isotopic systematics of sulfides from the Iheya North hydrothermal field in middle Okinawa Trough and the Yonaguni Knoll IV hydrothermal field in southern Okinawa Trough were investigated to understand the origin of ore-forming material and isotope fractionation during sulfide precipitation in back-arc spreading centers. The & delta;34S values (from 8.60%o to 9.68%o) of sulfide minerals in Iheya North field suggest sulfur was derived from the leaching of basement rocks and the reduction of seawater sulfate. But an additional light sulfur source from the dissolution of biogenic sulfides in sediments is indispensable for the observed low & delta;34S values (between 4.78%o and 4.97%o) of Yonaguni Knoll IV sulfides. Lead isotope compositions of all sulfides vary in a relatively wide range (206Pb/204Pb = 18.432 to 18.563, 207Pb/204Pb = 15.579 to 15.671, and 208Pb/204Pb = 38.539 to 38.979, respectively) which involves the mixing of mantle-derived and sedimentderived lead in varying proportions. Unusually high radiogenic lead isotope ratios of Yonaguni Knoll IV sulfides (207Pb/204Pb = 15.628 to 15.671, and 208Pb/204Pb = 38.854 to 38.979) imply the presence of old crustal fragments beneath southern OT. The hydrothermal fluids in OT are characterized by extremely low calculated & delta;56Fe values (-1.00%o to -1.32%o) which is attributed to reducing sediments. The paired Fe-isotope compositions of pyrite and chalcopyrite revealed significantly different iron isotope compositions of hydrothermal fluids in study areas and extremely complicated ore-forming processes. Rapid precipitation of pyrite from FeS precursors accompanying iron isotopic disequilibrium moves from FeS-fluid equilibrium to pyrite-fluid equilibrium during pyrite recrystallization. The combination of sulfur, lead, and iron isotopic data suggests that hydrothermal systems in back-arc spreading centers related to plate subduction are generally affected by mantle, overlying sediments as well as potential old continental crust fragments, which results in various hydrothermal fluids and complicated mineralization processes.
关键词	Hydrothermal mineralization Sulfur isotope Lead isotope Iron isotope Okinawa Trough
DOI	10.1016/j.dsr.2023.104006
收录类别	SCI
语种	英语
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050103]; Pilot National Laboratory for Marine Science and Technology (QNLM)[JCZX202008]; Pilot National Laboratory for Marine Science and Technology (QNLM)[2022QNLM050201]; National Natural Science Foundation of China[92258303]; National Natural Science Foundation of China[41806061]; Taishan Scholar Program of Shandong[ts201712075]
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:001026106700001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS关键词	EAST PACIFIC RISE ; DE-FUCA RIDGE ; IN-SITU SULFUR ; STABLE-ISOTOPE ; VOLCANIC-ROCKS ; IRON ISOTOPES ; IHEYA NORTH ; MINERAL DEPOSITION ; CHIMNEY MINERALS ; PYRITE FORMATION
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/182449
专题	深海极端环境与生命过程研究中心
通讯作者	Huang, Jing
作者单位	1.Deep Sea Multidisciplinary Res Ctr, Qingdao 266237, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Ocean Univ China, Key Lab Submarine Geosci & Prospecting Tech, Minist Educ, Qingdao 266100, Peoples R China
通讯作者单位	深海极端环境与生命过程研究中心
推荐引用方式 GB/T 7714	Wang, Shujie,Sun, Weidong,Huang, Jing,et al. S, Pb, and Fe isotope compositions of sulfides in middle and southern Okinawa Trough: Implying the complicated hydrothermal systems in back-arc spreading centers[J]. DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,2023,195:12.
APA	Wang, Shujie,Sun, Weidong,Huang, Jing,&Zhai, Shikui.(2023).S, Pb, and Fe isotope compositions of sulfides in middle and southern Okinawa Trough: Implying the complicated hydrothermal systems in back-arc spreading centers.DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,195,12.
MLA	Wang, Shujie,et al."S, Pb, and Fe isotope compositions of sulfides in middle and southern Okinawa Trough: Implying the complicated hydrothermal systems in back-arc spreading centers".DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 195(2023):12.