Open System Re-Os Isotope Behavior in Platinum-Group Minerals during Laterization?
In this short communication, we present preliminary data on the Re-Os isotopic systematics of platinum-group minerals (PGM) recovered from different horizons in the Falcondo Ni-laterite in the Dominican Republic. The results show differences in the Os-isotope composition in different populations of...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-10-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/11/10/1083 |
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| author | Thomas Aiglsperger José M. González-Jiménez Joaquín A. Proenza Salvador Galí Francisco Longo William L. Griffin Suzanne Y. O’Reilly |
| author_facet | Thomas Aiglsperger José M. González-Jiménez Joaquín A. Proenza Salvador Galí Francisco Longo William L. Griffin Suzanne Y. O’Reilly |
| author_sort | Thomas Aiglsperger |
| collection | DOAJ |
| description | In this short communication, we present preliminary data on the Re-Os isotopic systematics of platinum-group minerals (PGM) recovered from different horizons in the Falcondo Ni-laterite in the Dominican Republic. The results show differences in the Os-isotope composition in different populations of PGM: (i) pre-lateritic PGM yield <sup>187</sup>Os/<sup>188</sup>Os varying from 0.11973 ± 0.00134 to 0.12215 ± 0.00005 (2σ uncertainty) whereas (ii) lateritic PGM are more radiogenic in terms of <sup>187</sup>Os/<sup>188</sup>Os (from 0.12390 ± 0.00001 to 0.12645 ± 0.00005; 2σ uncertainty). We suggest that these differences reflect the opening of the Re-Os system in individual grains of PGM during lateritic weathering. The implications of these results are twofold as they will help to (1) elucidate the small-scale mobility of noble metals in the supergene setting and therefore the possible formation of PGM at these very low temperatures, (2) better refine the Os-isotopic datasets of PGM that are currently being used for defining dynamic models of core–mantle separation, crustal generation, and fundamental plate-tectonic processes such as the opening of oceans. |
| first_indexed | 2024-03-10T06:21:35Z |
| format | Article |
| id | doaj.art-ec9e416edbb84f98a1e3fc86dcfbb681 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T06:21:35Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-ec9e416edbb84f98a1e3fc86dcfbb6812023-11-22T19:16:34ZengMDPI AGMinerals2075-163X2021-10-011110108310.3390/min11101083Open System Re-Os Isotope Behavior in Platinum-Group Minerals during Laterization?Thomas Aiglsperger0José M. González-Jiménez1Joaquín A. Proenza2Salvador Galí3Francisco Longo4William L. Griffin5Suzanne Y. O’Reilly6Division of Geosciences and Environmental Engineering, Department of Civil Engineering and Natural Resources, Luleå University of Technology, SE 97187 Luleå, SwedenDepartamento de Mineralogía y Petrología, Facultad de Ciencias, Universidad de Granada, Avda. Fuentenueva s/n, 18002 Granada, SpainDepartament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona (UB), Martí i Franquès s/n, 08028 Barcelona, SpainDepartament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona (UB), Martí i Franquès s/n, 08028 Barcelona, SpainFaculty of Engineering, Universidad Catolica Tecnologica del Cibao (UCATECI), Ave. Universitaria, esq. Ave. Pedro Rivera, La Vega P.O. Box 401, Dominican RepublicARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC National Key Centre, Macquarie University, Sydney, NSW 2109, AustraliaARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC National Key Centre, Macquarie University, Sydney, NSW 2109, AustraliaIn this short communication, we present preliminary data on the Re-Os isotopic systematics of platinum-group minerals (PGM) recovered from different horizons in the Falcondo Ni-laterite in the Dominican Republic. The results show differences in the Os-isotope composition in different populations of PGM: (i) pre-lateritic PGM yield <sup>187</sup>Os/<sup>188</sup>Os varying from 0.11973 ± 0.00134 to 0.12215 ± 0.00005 (2σ uncertainty) whereas (ii) lateritic PGM are more radiogenic in terms of <sup>187</sup>Os/<sup>188</sup>Os (from 0.12390 ± 0.00001 to 0.12645 ± 0.00005; 2σ uncertainty). We suggest that these differences reflect the opening of the Re-Os system in individual grains of PGM during lateritic weathering. The implications of these results are twofold as they will help to (1) elucidate the small-scale mobility of noble metals in the supergene setting and therefore the possible formation of PGM at these very low temperatures, (2) better refine the Os-isotopic datasets of PGM that are currently being used for defining dynamic models of core–mantle separation, crustal generation, and fundamental plate-tectonic processes such as the opening of oceans.https://www.mdpi.com/2075-163X/11/10/1083Re-Os isotopesplatinum-group mineralsNi lateriteDominican Republic |
| spellingShingle | Thomas Aiglsperger José M. González-Jiménez Joaquín A. Proenza Salvador Galí Francisco Longo William L. Griffin Suzanne Y. O’Reilly Open System Re-Os Isotope Behavior in Platinum-Group Minerals during Laterization? Minerals Re-Os isotopes platinum-group minerals Ni laterite Dominican Republic |
| title | Open System Re-Os Isotope Behavior in Platinum-Group Minerals during Laterization? |
| title_full | Open System Re-Os Isotope Behavior in Platinum-Group Minerals during Laterization? |
| title_fullStr | Open System Re-Os Isotope Behavior in Platinum-Group Minerals during Laterization? |
| title_full_unstemmed | Open System Re-Os Isotope Behavior in Platinum-Group Minerals during Laterization? |
| title_short | Open System Re-Os Isotope Behavior in Platinum-Group Minerals during Laterization? |
| title_sort | open system re os isotope behavior in platinum group minerals during laterization |
| topic | Re-Os isotopes platinum-group minerals Ni laterite Dominican Republic |
| url | https://www.mdpi.com/2075-163X/11/10/1083 |
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