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New insights into the control of visible gold fineness and deposition: A case study of the Sanshandao gold deposit, Jiaodong, China

文献类型：期刊论文

作者Peng, Hong-Wei2,4; Fan, Hong-Rui2,3,4; Liu, Xuan1; Wen, Bo-Jie5; Zhang, Yong-Wen2,4; Feng, Kai2,4
刊名AMERICAN MINERALOGIST
出版日期2021
卷号106期号:1页码:135-149
关键词Visible gold grain fineness in situ pyrite trace elements in situ sulfide sulfur isotope Sanshandao gold deposit Jiaodong
ISSN号0003-004X
DOI10.2138/am-2020-7475
英文摘要Mineralogical distribution, textures, electron probe microanalysis of visible gold, laser ablationinductively coupled plasma-mass spectrometry (LA-ICP-MS) trace element analysis of pyrite, and LA-multicollector (MC-)ICP-MS sulfur isotope analysis of sulfide minerals are examined in an ore zone extending obliquely to -4 km depth in the Sanshandao gold deposit Jiaodong, China. We relate these results to the temporal and spatial ore-forming processes in the deposit to further elucidate the controls on the deposition of visible Au and fineness variation. Two generations of Au mineralization are identified. The early generation is represented by beresitization and quartz-pyrite veins in which visible Au grains are associated with pyrite (Py1 and Py2) and are characterized by high fineness [729-961; fineness = 1000xAu/(Au+Ag)]. Py1 and Py2 are both enriched in Co, Ni, and Bi and depleted in As and Au. Texturally, gold and pyrite are pristine crystals, homogeneous in composition. These features are attributed to the sulfidation of the granitic wallrock (fluid/rock interaction) that effectively destabilizes Au in the ore-forming fluids during pyrite deposition. Fineness decreases continuously from 870 at -2650 m depth to 752 at -420 m depth. The Co and Ni contents of Py1 and Py2 decrease significantly from -4000 m to -420 m depth, whereas the As contents increase. The mean delta S-34 values of Py1 increase from 10.5 to 11.8%. The spatial variations are interpreted to be related to gradual cooling, decompression, and an enhanced degree of fluid/rock interaction with decreasing depth, which facilitated the initiation of visible gold mineralization at ca. -2700 m depth. The late generation of Au mineralization is represented by quartz-polysulfide veins in which visible Au grains are associated with multiple sulfide minerals (Py3, galena, chalcopyrite, arsenopyrite, and sphalerite). It is characterized by low fineness (549-719), and heterogeneous textures with Ag-rich parts (218-421). Py3, occurring as the rim of pyrite grain, is interpreted to form by replacement via a dissolution-reprecipitation reaction. Py3 is distinctly enriched in As (median of 10 000 ppm) and Au (2.2 ppm), but depleted in Co, Ni, and Bi. The delta S-34 values of the polysulfide minerals decrease sharply by 4 to 5% at depths from -1909 to -1450 m. These features are interpreted to be generated by significant decompression and phase separation of fluid, where most ore elements (e.g., Au, Ag, As, and base metal elements) are destabilized. Our study suggests that remobilization did not affect the generation of visible Au mineralization at Sanshandao.
WOS关键词TRACE-ELEMENT ; HYDROTHERMAL SOLUTIONS ; CHLORIDE COMPLEXES ; GEOTHERMAL SYSTEM ; FLUID INCLUSIONS ; SULFUR ISOTOPES ; ORE GENESIS ; ICP-MS ; PYRITE ; MINERALIZATION
资助项目National Key Research and Development Program[2016YFC0600105] ; National Natural Science Foundation of China[41672094]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000604401600014
出版者MINERALOGICAL SOC AMER
资助机构National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/99962]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Fan, Hong-Rui
作者单位1.Univ Lorraine, GeoRessources Lab, CREGU, CNRS, F-54500 Vandoeuvre Les Nancy, France
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
5.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China
推荐引用方式
GB/T 7714		 Peng, Hong-Wei,Fan, Hong-Rui,Liu, Xuan,et al. New insights into the control of visible gold fineness and deposition: A case study of the Sanshandao gold deposit, Jiaodong, China[J]. AMERICAN MINERALOGIST,2021,106(1):135-149.
APA Peng, Hong-Wei,Fan, Hong-Rui,Liu, Xuan,Wen, Bo-Jie,Zhang, Yong-Wen,&Feng, Kai.(2021).New insights into the control of visible gold fineness and deposition: A case study of the Sanshandao gold deposit, Jiaodong, China.AMERICAN MINERALOGIST,106(1),135-149.
MLA Peng, Hong-Wei,et al."New insights into the control of visible gold fineness and deposition: A case study of the Sanshandao gold deposit, Jiaodong, China".AMERICAN MINERALOGIST 106.1(2021):135-149.

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来源：地质与地球物理研究所

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