Genesis and evolution of framboidal pyrite and its implications for the ore-forming process of Carlin-style gold deposits, southwestern China

doi:10.1016/j.oregeorev.2018.09.022

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院地球与行星物理重点实验室

	Genesis and evolution of framboidal pyrite and its implications for the ore-forming process of Carlin-style gold deposits, southwestern China
	Zhao, Jing 1; Liang, Jinlong 2; Long, Xiaoping 1; Li, Jun 2; Xiang, Qirong 2; Zhang, Jianchao 3; Hao, Jialong 3
刊名	ORE GEOLOGY REVIEWS
	2018-11-01
卷号	102 页码:426-436
关键词	Framboidal pyrite Carlin-style deposit Nano-SIMS Elemental mapping Genesis and evolution
ISSN号	0169-1368
DOI	10.1016/j.oregeorev.2018.09.022
英文摘要	Southwestern Guizhou, an indispensable component of the "golden triangle" area of southwestern China, is famous for its numerous Carlin-style gold deposits. Unlike other sulfides in the deposits that have been well studied, the genesis of framboidal pyrite is still controversial because of its tiny size. Here, we first determined the chemical and in situ sulfur isotopic compositions of framboidal pyrites from three typical Carlin-style gold deposits (namely Shuiyindong, Taipingdong and Nibao) using secondary electron image (SEI), back scattered electron (BSE), electron probe micro analysis (EPMA), and nanometer-scale secondary ion mass spectroscopy (Nano-SIMS) methods. Our EPMA data show that the framboidal pyrites contain a minor amount of trace elements (Ni < 0.344 wt%, Co = 0.017-0.295 wt%, Cr = 0.009-0.292 wt% and As < 1.479 wt%). Incorporation of the trace elements into the framboidal pyrites resulted in a slight decrease in S and Fe concentrations compared to the theoretical values. The in situ delta S-34 values of the framboidal pyrites, ranging from -53.2 parts per thousand to -30.9 parts per thousand, are in good agreement with the sulfur isotopic fractionation triggered by the bacterial sulfate reduction (BSR) process in an open-SO42- ocean condition. Combined with SEI, BSE, and Nano-SIMS high-resolution multiple elemental mapping, four consecutive processes responsible for their genesis and evolution are summarized as follows: (1) initial microcrystal nucleation via the BSR process, (2) abundant microcrystal aggregation to form individual framboid and multiple-framboids during sedimentation or diagenesis, (3) partial replacement and recrystallization of preexisting framboids by As-rich ore fluids, and (4) eventual framboidal pyrite transformation to larger euhedral grains via continuous recrystallization. These processes not only present compelling mechanisms responsible for the variations in morphology and chemical composition of the framboidal pyrites, from the initial framboid with a low (AsS)-As-75-S-32 signal (Py1) to the framboid with a recrystallization origin (Py3), but also indicate that their genesis and evolution may have an intimate correlation with the formation of Carlin-style gold deposits.
资助项目	National Geological Survey Foundation of China[12120113095500] ; National Key Research and Development Program of China[2016YFC0601003] ; National Natural Science Foundation of China[41421002] ; National Natural Science Foundation of China[41273031] ; MOST Special Fund from the State Key Laboratory of Continental Dynamics
WOS关键词	SULFUR ISOTOPES ; ARSENIAN PYRITE ; TRACE-ELEMENTS ; NEVADA ; ORIGIN ; GUIZHOU ; TREND ; GEOCHEMISTRY ; SEDIMENTARY ; MECHANISMS
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000453493100021
资助机构	National Geological Survey Foundation of China ; National Geological Survey Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; National Geological Survey Foundation of China ; National Geological Survey Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; National Geological Survey Foundation of China ; National Geological Survey Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; National Geological Survey Foundation of China ; National Geological Survey Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; MOST Special Fund from the State Key Laboratory of Continental Dynamics
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/90272]
专题	地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者	Liang, Jinlong; Long, Xiaoping
作者单位	1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China 2.Chengdu Univ Technol, Dept Geochem, Chengdu 610059, Sichuan, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Jing,Liang, Jinlong,Long, Xiaoping,et al. Genesis and evolution of framboidal pyrite and its implications for the ore-forming process of Carlin-style gold deposits, southwestern China[J]. ORE GEOLOGY REVIEWS,2018,102:426-436.
APA	Zhao, Jing.,Liang, Jinlong.,Long, Xiaoping.,Li, Jun.,Xiang, Qirong.,...&Hao, Jialong.(2018).Genesis and evolution of framboidal pyrite and its implications for the ore-forming process of Carlin-style gold deposits, southwestern China.ORE GEOLOGY REVIEWS,102,426-436.
MLA	Zhao, Jing,et al."Genesis and evolution of framboidal pyrite and its implications for the ore-forming process of Carlin-style gold deposits, southwestern China".ORE GEOLOGY REVIEWS 102(2018):426-436.