Platinum-group minerals in the Limoeiro Ni–Cu-PGE) sulfide deposit, Brazil: the effect of magmatic and upper amphibolite to granulite metamorphic processes on PGM formation

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• 作者：J. Mota-e-Silva ; H. M. Prichard ; C. F. Ferreira Filho ; P. C. Fisher…
• 关键词：Platinum ; group ; minerals ; Merenskyite ; Upper amphibolite to granulite facies metamorphism ; Sperrylite ; Ni–Cu–PGE sulfide deposit ; Platinum ; group elements
• 刊名：Mineralium Deposita
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：50
• 期：8
• 页码：1007-1029
• 全文大小：8,799 KB
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  Godel B, González-álvar
• 作者单位：J. Mota-e-Silva (1) (2)
  H. M. Prichard (3)
  C. F. Ferreira Filho (2)
  P. C. Fisher (3)
  I. McDonald (3)
  
  1. Votorantim Metals, Rua Luiz Benezato, 500, Jundiaí, SP, 13212-161, Brazil
  2. Instituto de Geociências, Universidade de Brasilia, Brasília, DF, 70900-970, Brazil
  3. School of Earth and Ocean Science, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Mineral Resources
  Mineralogy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1866

文摘

The Limoeiro Ni–Cu-platinum-group elements (PGE)) deposit is a recent discovery associated with an igneous tubular conduit system in northeastern Brazil. Representative ores from the deposit have been used for platinum-group minerals (PGM) identification and for PGE in base metal sulfides (BMS) quantification. Ninety-eighty percent of the PGM in the massive sulfide ores is homogeneous Pt–Ni–Bi-bearing merenskyite (PdTe₂) enclosed primarily by pyrrhotite, suggesting that it is formed by exsolution from monosulfide solid solution (MSS). Merenskyite gradually but systematically becomes poorer in Pt and Ni with increasing fractionation, which is interpreted to reflect a transition to a more evolved sulfide liquid that segregated in the eastern parts of the intrusion. In massive sulfide ores, merenskyite forms unusually large (up to 5000 μm2) euhedral grains, commonly in contact with spherical silicate inclusions. BMS hosts 12-6 % of the Pd, with the remainder hosted by PGM, which is interpreted to indicate that merenskyite recrystallized from a PGE-bearing bismuthotelluride metamorphic melt formed during high-grade metamorphism. Sperrylite (PtAs₂) is the second most abundant PGM (18 % of PGM in disseminated ore) and in contrast to merenskyite occurs mainly as very small (median of 25 μm2) inclusions in high-temperature silicates and oxides, interpreted to have crystallized at high temperatures directly from sulfide blebs that formed and were transported within the Limoeiro magma conduit. Keywords Platinum-group-minerals Merenskyite Upper amphibolite to granulite facies metamorphism Sperrylite Ni–Cu–PGE sulfide deposit Platinum-group elements