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Os-isotope study of platinum-group minerals in chromitites in Alpine-type ultramafic intrusions and the associated placers in Borneo

Published online by Cambridge University Press:  05 July 2018

Keiko Hattori ,
Klaus-Peter Burgath  and
Stanley R. Hart
Keiko Hattori
Affiliation:
Ottawa-Carleton Geoscience Centre and Dept. of Earth Sciences, University of Ottawa, Ottawa K1N 6N5, Canada
Klaus-Peter Burgath
Affiliation:
Bundesanstalt für Geowissenschaften und Rohstoffe, Postfach 510153, D-3000 Hannover 51, Germany
Stanley R. Hart
Affiliation:
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, U.S.A.
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Abstract

187Os/186Os ratios were determined for in-situ laurite grains in Alpine-type chromitites and platinumgroup minerals (PGM) in the associated alluvial placers in Borneo, Indonesia/Malaysia. The Osisotope ratios of laurite grains in chromite defne an 187Os/186Os ratio for the 100 Ma mantle source of c. 1.04. Thelow 187Os/186Os ratios in all grains confirm the essential derivation of these platinum-group elements (PGE) from the mantle. A minor variation in 187Os/186Os ratios was detected among PGM from placers, but no variation was found within individual grains, including a grain with chemical inhomogeneity. The values are similar to those for PGM in the associated chromitites. The data are consistent with a detrital origin of PGM in placers: the placer PGM originated in the ultramafic section of ophiolities and the release of these grains from igneous rocks and their deposition in placers was almost entirely by mechanical processes.

Keywords

osmium isotopesplatinum-group mineralslauritechromititesBorneoIndonesiaMalaysia
Type
Petrology and Geochemistry
Information
Mineralogical Magazine , Volume 56 , Issue 383 , June 1992 , pp. 157 - 164
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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