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Incorporation mechanism of structurally bound gold in pyrite: Insights from an integrated chemical and atomic-scale microstructural study
Meng, Lei1,2; Zhu, Sanyuan3; Li, Xiaochun4; Chen, Wei Terry5; Xian, Haiyang1; Gao, Xinyu6; Zhao, Taiping1,2
2022-04-26
Source PublicationAMERICAN MINERALOGIST
ISSN0003-004X
Volume107Issue:4Pages:603-613
AbstractPyrite is one of the most important carriers for Au in hydrothermal deposits, but the incorporation mechanism of structurally boundAu has long been a matter of debate. This is due to a poor understanding of the chemical state and coordination environments of Au in the pyrite structure. Arsenian pyrite is the dominant Au-hosting mineral from the Shanggong Au deposit (130 t Au) in the southern margin of the North China Craton. Our EPMA and LA-ICP-MS results show that the arsenian pyrite has remarkably high Au (0.05-0.78 wt%) and As (0.39-4.60 wt%) contents. Au is negatively correlated with Fe but positively correlated with As. Z-contrast HAADF-STEM imaging reveals that Au atoms sit at the Fe atom sites in the arsenian pyrite structure. Our mu-XANES results and previously reported data suggest that Au and As in arsenian pyrite are predominant of chemically bound Au+ and As- , respectively. We thus propose that Au+ and As- are both structurally bound and sit at the Fe and S atom sites of pyrite, respectively. As may not be necessary but favorable for the incorporation of structurally bound Au in pyrite. These results have significant implications for understanding the enrichment mechanism of Au from ore-forming fluids with low-Au and low-As concentrations into arsenian pyrite and for revealing the role of As in Au mineralization of hydrothermal deposits.
KeywordArsenian pyrite mu-XANES spectroscopy Z-contrast HAADF-STEM image Au incorporation mechanism
DOI10.2138/am-2021-7812
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China
WOS KeywordBEARING ARSENIAN PYRITE ; LA-ICP-MS ; INVISIBLE GOLD ; DEPOSIT ; GEOCHEMISTRY ; SPECIATION ; AU ; MINERALIZATION ; NANOSTRUCTURE ; MARCASITE
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFC0600106] ; National Key Research and Development Program of China[2016YFC0600408] ; [2018-SSRF-PT-005554]
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000773853500005
PublisherMINERALOGICAL SOC AMER
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105058
Collection矿产资源研究院重点实验室
Corresponding AuthorZhao, Taiping
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Met, Guangzhou 510640, Peoples R China
2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
5.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China
6.Guangdong Polytech Water Resources & Elect Engn, Guangzhou 510635, Peoples R China
Recommended Citation
GB/T 7714
Meng, Lei,Zhu, Sanyuan,Li, Xiaochun,et al. Incorporation mechanism of structurally bound gold in pyrite: Insights from an integrated chemical and atomic-scale microstructural study[J]. AMERICAN MINERALOGIST,2022,107(4):603-613.
APA Meng, Lei.,Zhu, Sanyuan.,Li, Xiaochun.,Chen, Wei Terry.,Xian, Haiyang.,...&Zhao, Taiping.(2022).Incorporation mechanism of structurally bound gold in pyrite: Insights from an integrated chemical and atomic-scale microstructural study.AMERICAN MINERALOGIST,107(4),603-613.
MLA Meng, Lei,et al."Incorporation mechanism of structurally bound gold in pyrite: Insights from an integrated chemical and atomic-scale microstructural study".AMERICAN MINERALOGIST 107.4(2022):603-613.
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