Deep mantle cycle of chalcophile metals and sulfur in subducted oceanic crust
文献类型：期刊论文
| 作者 | Zou, Zongqi2,3; Wang, Zaicong2; Xu, Yi-Gang1,3; Foley, Stephen6; Cheng, Huai4; Ma, Liang3 ; Wang, Xiang2; Chen, Kang2; Hu, Zhaochu2; Liu, Yongsheng2
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| 刊名 | GEOCHIMICA ET COSMOCHIMICA ACTA
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| 出版日期 | 2024-04-01 |
| 卷号 | 370页码:15-28 |
| 关键词 | Chalcophile elements Cu/Ag Platinum group elements Altered oceanic crust Mantle metasomatism Sulfide |
| ISSN号 | 0016-7037 |
| DOI | 10.1016/j.gca.2024.02.007 |
| 英文摘要 | Understanding the subduction-driven recycling of economically important chalcophile metals (e.g., Cu, Au, Ag, and platinum -group elements, PGEs) and volatiles (e.g., sulfur) is critical for assessing models of ore formation. However, whether the sulfide remains stable in recycled altered oceanic crust (AOC) in the mantle is unclear, and the influence of AOC-derived metasomatic agents on the extraction efficiency of chalcophile elements from the deep mantle remains poorly understood. Here we report whole -rock Cu-Ag-Au-Re-PGEs of Cenozoic alkaline basalts at Hannuoba, eastern China, which were derived from the interaction of carbonated eclogite (recycled AOC)-derived melts with lithospheric peridotites. Volatile -rich primitive melts from carbonated eclogite are poor in strongly chalcophile metals (e.g., n-ary sumation PGE < 1 ng/g, Au < 1 ng/g, Cu < 30 mu g/g). Remarkably, primitive melts show significant fractionation of elements with variable chalcophile affinities, such as lower Cu/Ag ratios than those in primitive mantle and MORBs. These features reflect the sequestration of these metals in residual monosulfide solid solution (MSS) during low -degree melting of the AOC in the deep mantle. Given the retention of sulfides in the AOC, partial melts derived from it are rich in sulfur but poor in strongly chalcophile metals. The Hannuoba alkaline melts scavenged some strongly chalcophile metals from peridotites (especially PGEs) during their ascent. However, this did not necessarily lead to the formation of chalcophile metal -enriched melts (e.g., Au < 1 ng/g and Cu < 60 mu g/g). These processes appear to be common in eastern China, as evidenced by the low abundances of Cu and Au found in many primitive intraplate alkaline basalts. We propose that strongly chalcophile elements in subducted AOC are efficiently transported into, and stored in, the deep mantle, with a small proportion returning to the exosphere through volcanism. Moreover, the chalcophile metal -poor and volatile -rich melts of subducted AOC could also explain the addition of abundant sulfur (secondary sulfides), but limited chalcophile metals to the metasomatized mantle. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001194091300001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77230]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Wang, Zaicong |
| 作者单位 | 1.Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou 511458, Peoples R China 2.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 3.Chinese Acad Sci, CAS Ctr Excellence Deep Earth Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 4.China Geol Survey, Sanya Inst South China Sea Geol, Guangzhou Marine Geol Survey, Sanya 572024, Peoples R China 5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 6.Macquarie Univ, Sch Nat Sci, N Ryde, NSW 2109, Australia |
| 推荐引用方式 GB/T 7714 | Zou, Zongqi,Wang, Zaicong,Xu, Yi-Gang,et al. Deep mantle cycle of chalcophile metals and sulfur in subducted oceanic crust[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2024,370:15-28. |
| APA | Zou, Zongqi.,Wang, Zaicong.,Xu, Yi-Gang.,Foley, Stephen.,Cheng, Huai.,...&Liu, Yanhong.(2024).Deep mantle cycle of chalcophile metals and sulfur in subducted oceanic crust.GEOCHIMICA ET COSMOCHIMICA ACTA,370,15-28. |
| MLA | Zou, Zongqi,et al."Deep mantle cycle of chalcophile metals and sulfur in subducted oceanic crust".GEOCHIMICA ET COSMOCHIMICA ACTA 370(2024):15-28. |
入库方式： OAI收割
来源：广州地球化学研究所
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