Open system Re-Os isotope behavior in platinum-group minerals during laterization?

Thomas Aiglsperger; José M. González-Jiménez; Joaquín A. Proenza; Salvador Galí; Francisco Longo; William L. Griffin; Suzanne Y. O’Reilly

doi:10.3390/min11101083

Open system Re-Os isotope behavior in platinum-group minerals during laterization?

Thomas Aiglsperger^*, José M. González-Jiménez, Joaquín A. Proenza, Salvador Galí, Francisco Longo, William L. Griffin, Suzanne Y. O’Reilly

^*Corresponding author for this work

ARC Centre of Excellence for Core to Crust Fluid Systems (incorporation ARC National Key Centre for Geochemical evolution and Metallogeny of Continents (GEMOC))

Research output: Contribution to journal › Article › peer-review

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Abstract

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 yield¹⁸⁷ Os/¹⁸⁸ Os varying from 0.11973 ± 0.00134 to 0.12215 ± 0.00005 (2σ uncertainty) whereas (ii) lateritic PGM are more radiogenic in terms of¹⁸⁷ Os/¹⁸⁸ 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.

Original language	English
Article number	1083
Pages (from-to)	1-8
Number of pages	8
Journal	Minerals
Volume	11
Issue number	10
DOIs	https://doi.org/10.3390/min11101083
Publication status	Published - Oct 2021

Bibliographical note

Copyright the Author(s) 2021. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

Re-Os isotopes
platinum-group minerals
Ni laterite
Dominican Republic

Access to Document

10.3390/min11101083Licence: CC BY

Publisher version (open access)Final published version, 2.41 MBLicence: CC BY

Cite this

@article{bdb6dd875cbb45bd9658fcd604e23648,

title = "Open system Re-Os isotope behavior in platinum-group minerals during laterization?",

abstract = "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 yield187 Os/188 Os varying from 0.11973 ± 0.00134 to 0.12215 ± 0.00005 (2σ uncertainty) whereas (ii) lateritic PGM are more radiogenic in terms of187 Os/188 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.",

keywords = "Re-Os isotopes, platinum-group minerals, Ni laterite, Dominican Republic",

author = "Thomas Aiglsperger and Gonz{\'a}lez-Jim{\'e}nez, {Jos{\'e} M.} and Proenza, {Joaqu{\'i}n A.} and Salvador Gal{\'i} and Francisco Longo and Griffin, {William L.} and O{\textquoteright}Reilly, {Suzanne Y.}",

note = "Copyright the Author(s) 2021. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

year = "2021",

month = oct,

doi = "10.3390/min11101083",

language = "English",

volume = "11",

pages = "1--8",

journal = "Minerals",

issn = "2075-163X",