Metamorphic origin of large nuggets of platinum-group metals: evidence from multiphase inclusions in Os-Ir-Ru alloys from the Adamsfield placer, Tasmania
文献类型：期刊论文
| 作者 | Kutyrev, Anton11; Kamenetsky, Vadim S.9,10; Chayka, Ivan F.8; Nekrylov, Nikolai A.7; Kryuchkova, Lyudmila6; Shilovskikh, Vladimir V.5; Kontonikas-Charos, Alkiviadis4; Krasheninnikov, Stepan P.3; Sapegina, Anna1,2,8; Perchuk, Alexei L.1,2,8 |
| 刊名 | JOURNAL OF PETROLOGY
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| 出版日期 | 2024-08-21 |
| 卷号 | 65期号:8页码:12 |
| 关键词 | ophiolite osmium chromitite melt inclusions platinum-group elements |
| ISSN号 | 0022-3530 |
| DOI | 10.1093/petrology/egae086 |
| 通讯作者 | Kutyrev, Anton(KutyrevA@cardiff.ac.uk) |
| 英文摘要 | Platinum-group elements (PGE) are most effectively concentrated via sulfide-silicate melt immiscibility; however, under sulfide-undersaturated conditions, PGE may exhibit highly siderophile behavior and occur as native metals and alloys. In this case, they can form micrometer-size inclusions within Cr-spinel, but also large nuggets (up to several kilograms), found in chromitites and related placer deposits. The exact formation mechanism of such large nuggets and accumulations of PGE unrelated to sulfide melts remains controversial due to mass balance issues. In this study of multiphase inclusions in Os-Ir-Ru nuggets from the Adamsfield placer district (Tasmania, Australia), we constrain their crystallization environment. Multiphase inclusions comprise variable proportions of hornblende, enstatite, quartz, anthophyllite, anorthite, chlorite and native iridium and coexist with single-phase olivine and Cr-spinel inclusions. The heterogeneity in phase and chemical composition of the inclusions indicates a complex origin from an inhomogeneous source media. This is corroborated by grain scale disequilibrium mineral assemblages, where forsterite and quartz are both included within a single osmium grain. Our proposed multi-stage origin of Adamsfield Os-Ir-Ru nuggets involved magmatic olivine-Cr-spinel-Os-Ir-Ru cumulates in peridotite bodies that were subsequently overprinted by various hydrothermal and metamorphic processes, including serpentinization or growth of Os-Ir-Ru from supercritical fluids. The final metamorphic stage resulted in the obliteration of Os-Ir-Ru zonation, culminating in the current assemblage of inclusions. |
| WOS关键词 | HIGHLY-SIDEROPHILE ELEMENTS ; GROUP MINERALS ; OMAN OPHIOLITE ; SULFIDE LIQUID ; NIZHNY-TAGIL ; CR-SPINEL ; CHROMITITES ; SILICATE ; FRACTIONATION ; COMPLEX |
| 资助项目 | Visiting Scientist Award by the Chinese Academy of Sciences ; D.S. Korzhinskii Institute of Experimental Mineralogy RAS (I.F.C.)[FMUF-2022-0004] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001295031900001 |
| 出版者 | OXFORD UNIV PRESS |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/198074]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Kutyrev, Anton |
| 作者单位 | 1.RAS, Korzhinskii Inst Expt Mineral, Lab Lithosphere Metamorphism Magmatism & Geodynam, 4 Academician Ossipyanstr, Chernogolovka 142432, Russia 2.Moscow MV Lomonosov State Univ, Fac Geol, Dept Petrol & Volcanol, Leninskie Gori 1, Moscow 119991, Russia 3.RAS, Vernadsky Inst Geochem & Analyt Chem, Lab Geochem Igneous & Metamorph Rocks, 19 Kosygina str, Moscow 119991, Russia 4.Queensland Univ Technol, Sch Earth & Atmospher Sci, P Block,Level 6,Gardens Point Rd, Brisbane, Qld 4001, Australia 5.St Petersburg State Univ, Geomodel Ctr, Ulyanovskaya str 1, St Petersburg 198504, Russia 6.St Petersburg State Univ, Ctr X Ray Diffract Studies, Res Pk, Decabristov lane 16, St Petersburg 199155, Russia 7.Inst Geol Sci NAS RA, Lab Volcanol, Marshal Baghramyan Ave 24, Yerevan, Armenia 8.Korzhinskii Inst Expt Mineral RAS, Lab Physiochem Problems Magmatism, 4 Academician Ossipyan Str, Chernogolovka 142432, Russia 9.Inst Volcanol & Seismol FEB RAS, Lab Mineral, Piipa 9, Petropavlovsk Kamchatski 683006, Russia 10.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, 7 Nanhai Rd, Qingdao 266071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Kutyrev, Anton,Kamenetsky, Vadim S.,Chayka, Ivan F.,et al. Metamorphic origin of large nuggets of platinum-group metals: evidence from multiphase inclusions in Os-Ir-Ru alloys from the Adamsfield placer, Tasmania[J]. JOURNAL OF PETROLOGY,2024,65(8):12. |
| APA | Kutyrev, Anton.,Kamenetsky, Vadim S..,Chayka, Ivan F..,Nekrylov, Nikolai A..,Kryuchkova, Lyudmila.,...&Perchuk, Alexei L..(2024).Metamorphic origin of large nuggets of platinum-group metals: evidence from multiphase inclusions in Os-Ir-Ru alloys from the Adamsfield placer, Tasmania.JOURNAL OF PETROLOGY,65(8),12. |
| MLA | Kutyrev, Anton,et al."Metamorphic origin of large nuggets of platinum-group metals: evidence from multiphase inclusions in Os-Ir-Ru alloys from the Adamsfield placer, Tasmania".JOURNAL OF PETROLOGY 65.8(2024):12. |
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来源：海洋研究所
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