Using pyrite composition to track the multi-stage fluids superimposed on a porphyry Cu system
文献类型：期刊论文
| 作者 | Wu, Chao2,3,4,6; Cooke, David R.3,4; Baker, Michael J.3,4; Zhang, Lejun3,4; Liang, Pei1; Fang, Jing6; Olin, Paul4; Danyushevsky, Leonid V.; Chen, Huayong2,5,6
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| 刊名 | AMERICAN MINERALOGIST
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| 出版日期 | 2024-05-27 |
| 卷号 | 109期号:5页码:827-845 |
| 关键词 | Central Asian Orogenic Belt Yulekenhalasu porphyry Cu-Mo deposit pyrite composition superimposed alteration and mineralization |
| ISSN号 | 0003-004X |
| DOI | 10.2138/am-2022-8727 |
| 英文摘要 | The Yulekenhalasu porphyry Cu-Mo deposit (0.2 Mt Cu at 1.04 wt% and 0.012 Mt Mo at 0.06 wt%) is located in the Devonian Halasu copper belt, East Junggar block, northwest China. At Yulekenhalasu, Cu and Mo mineralization commonly occurs as disseminated sulfides or veinlets in porphyry-related alteration zones. Five alteration stages have been identified, including porphyry-type alteration, i.e., sodic-calcic (stage I), potassic (stage IIa), propylitic (stage IIb), and phyllic (stage III) alteration, and widespread late Cu sulfide-bearing veins (stage IV) cross-cutting porphyry-type alteration, plus a post-ore fault-controlled argillic alteration (stage V). Stages IV and V have overprinted porphyry-type alteration (stages I-III). Anomalous concentrations of trace elements in stage IIb pyrite (e.g., Ti, Zr, Gd, and Hf) are due to the presence of micro-inclusions (e.g., zircon and rutile) in the low-temperature (similar to 200 degrees C) propylitic zone. Cu, Ag, Co, and Mn, occurring as stoichiometric substitutions or as tetrahedrite inclusions in overprinting stage IV pyrite, were sourced directly from the primary hydrothermal fluid. The enrichment of distal pathfinder elements (e.g., Cr, Au, and Tl) in overprinting stage V pyrite was caused by a low-temperature (similar to 160 degrees C) hydrothermal event related to regional orogenic Au mineralization. The spatial variation of Se/S in pyrite among various paragenetic stages were influenced by changes in the hydrothermal fluid composition and temperature, with the latter having the effect of decreasing pyrite Se/S. Lower Se concentrations in pyrite of stages IIb and III close to the orebody are explained by relatively higher temperatures in the locus of mineralization. This may provide a potential vectoring tool to mineralization using pyrite geochemistry in porphyry deposits. Systematic thermodynamic calibrations were applied to pyrite compositions to fingerprint the corresponding Se/S and Co/Ni ratios of fluids and further to develop a complete metallogenic model for Yulekenhalasu. The Devonian diorite porphyry generated fluids that produced the early porphyry-type alteration. High Co/Fe (average similar to 1 x 10(-4)) and Ni/Fe (average similar to 3 x 10(-6)) ratios of fluid for late Cu sulfide-bearing veins, combined with higher Se/S (average similar to 6 x 10(-7)) than orogenic Au deposits (average similar to 3 x 10(-8)), indicate that the fluids possibly derived from a Late Devonian-Carboniferous mafic intrusion. Argillic alteration assemblages forming at ca. 280 Ma host pyrite relatively enriched in Au (average 0.1 ppm, with native gold inclusions). Therefore it is likely related to a regional orogenic gold mineralizing event in the Early Permian that overprinted Devonian mineralization. Although spatially contiguous, hydrothermal alteration and hypogene mineralizing stages identified herein represent discrete episodes of hydrothermal activities at Yulekenhalasu. The multi-stage alteration features observed at Yulekenhalasu may provide insights into the complete evolutionary history of Paleozoic porphyry Cu deposit systems in the Central Asian orogenic belt. This study contributes to a better understanding of the metallogenic and exploration models of porphyry Cu deposits overprinted by multi-stage hydrothermal events, which is economically important in Phanerozoic orogenic belts. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001245532900002 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78396]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Chen, Huayong |
| 作者单位 | 1.Univ Sci & Technol Beijing, Civil & Resource Engn Sch, Beijing 100083, Peoples R China 2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Univ Tasmania, TMVC, ARC Res Hub Transforming Min Value Chain, Private Bag 79, Hobart, Tas 7001, Australia 4.Univ Tasmania, Ctr Ore Deposit & Earth Sci, CODES, Hobart, Tas 7001, Australia 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Guangzhou Inst Geochem, Chinese Acad Sci, Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Chao,Cooke, David R.,Baker, Michael J.,et al. Using pyrite composition to track the multi-stage fluids superimposed on a porphyry Cu system[J]. AMERICAN MINERALOGIST,2024,109(5):827-845. |
| APA | Wu, Chao.,Cooke, David R..,Baker, Michael J..,Zhang, Lejun.,Liang, Pei.,...&Chen, Huayong.(2024).Using pyrite composition to track the multi-stage fluids superimposed on a porphyry Cu system.AMERICAN MINERALOGIST,109(5),827-845. |
| MLA | Wu, Chao,et al."Using pyrite composition to track the multi-stage fluids superimposed on a porphyry Cu system".AMERICAN MINERALOGIST 109.5(2024):827-845. |
入库方式： OAI收割
来源：广州地球化学研究所
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