Geochemistry of pyrite and chalcopyrite from an active black smoker in 49.6A degrees E Southwest Indian Ridge

doi:10.1007/s11001-017-9324-5

	Geochemistry of pyrite and chalcopyrite from an active black smoker in 49.6A degrees E Southwest Indian Ridge
	Yuan, Bo 1; Yang, Yaomin 1,2; Yu, Hongjun 1; Zhao, Yuexia 1; Ding, Qingfeng 3; Yang, Jichao 1; Tang, Xin 1
刊名	MARINE GEOPHYSICAL RESEARCH
	2018-09
卷号	39 期号:3 页码:441-461
关键词	Pyrite Chalcopyrite LA-ICP-MS trace element analysis Mineral chemistry Volcano-hosted massive sulfide 49.6 degrees E Southwest Indian Ridge district
ISSN号	0025-3235
DOI	10.1007/s11001-017-9324-5
英文摘要	Active hydrothermal chimneys, as the product of submarine hydrothermal activity, can be used to determine the fluid evolution and formation process of potential volcanic-hosted massive sulfide deposits. A hard-won specimen from an active hydrothermal chimney was collected in the 49.6A degrees E ultraslow-spreading Southwest Indian Ridge (SWIR) field through a television-guided grab. A geochemical study of prominent sulfide (e.g., pyrite and chalcopyrite) included in this sample was performed using laser ablation inductively coupled plasma mass spectroscopy. The early sulfides produced at low temperature are of disseminated fine-grained anhedral morphology, whereas the late ones with massive, coarse euhedral features precipitated in a high-temperature setting. The systematic variations in the contents of minor and trace elements are apparently related to the crystallization sequence, as well as to texture. Micro-disseminated anhedral sulfides rich in Pb, As, Ni, Ba, Mn, Mo, U, and V were formed during the initial chimney wall growth, whereas those rich in Sn, Se, and Co with massive, coarse euhedral morphology were formed within the late metallogenic stage. The hydrothermal fluid composition has experienced a great change during the chimney growth. Such a conclusion is consistent with that indicated by using principal component analysis, which is a powerful statistical analysis method widely used to project multidimensional datasets (e.g., element contents in different mineral phases) into a few directions. This distribution pattern points to crystallographic controls on minor and trace element uptake during chimney growth, occurring with concomitant variations in the fluid composition evolutionary history. In this pyrite-chalcopyrite-bearing active hydrothermal chimney at the SWIR, the metal concentration and precipitation of sulfides largely occurred at the seafloor as a result of mixing between the upwelling hot hydrothermal fluid and cold seawater. Over the course of mixing, significant variations in metal solubility were caused by changes in temperature, pH, and redox conditions in the parental fluid phase.
资助项目	National Basic Research Program of China[2015CB755901]
WOS关键词	LA-ICP-MS ; MID-ATLANTIC RIDGE ; HYDROTHERMAL SYSTEMS ; TRACE-ELEMENT ; SULFIDE MINERALS ; GOLD DEPOSIT ; CHINA IMPLICATION ; MINOR ELEMENTS ; GROWTH HISTORY ; ORE GENESIS
WOS研究方向	Geochemistry & Geophysics ; Oceanography
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000442454800006
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/25245]
专题	自然资源部第一海洋研究所
通讯作者	Yang, Yaomin
作者单位	1.State Ocean Adm, Natl Deep Sea Ctr, Qingdao 266237, Peoples R China 2.Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 3.Jilin Univ, Coll Earth Sci, Changchun 130061, Jilin, Peoples R China
推荐引用方式 GB/T 7714	Yuan, Bo,Yang, Yaomin,Yu, Hongjun,et al. Geochemistry of pyrite and chalcopyrite from an active black smoker in 49.6A degrees E Southwest Indian Ridge[J]. MARINE GEOPHYSICAL RESEARCH,2018,39(3):441-461.
APA	Yuan, Bo.,Yang, Yaomin.,Yu, Hongjun.,Zhao, Yuexia.,Ding, Qingfeng.,...&Tang, Xin.(2018).Geochemistry of pyrite and chalcopyrite from an active black smoker in 49.6A degrees E Southwest Indian Ridge.MARINE GEOPHYSICAL RESEARCH,39(3),441-461.
MLA	Yuan, Bo,et al."Geochemistry of pyrite and chalcopyrite from an active black smoker in 49.6A degrees E Southwest Indian Ridge".MARINE GEOPHYSICAL RESEARCH 39.3(2018):441-461.