| Reference Type | Journal (article/letter/editorial) |
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| Title | Os-isotope study of platinum-group minerals in chromitites in Alpine-type ultramafic intrusions and the associated placers in Borneo |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Hattori, Keiko | Author |
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| Burgath, Klaus-Peter | Author |
| Hart, Stanley R. | Author |
| Year | 1992 (June) | Volume | 56 |
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| Issue | 383 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_56/56-383-157.pdf+ |
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| DOI | doi:10.1180/minmag.1992.056.383.02Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1808 | Long-form Identifier | mindat:1:5:1808:5 |
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| GUID | 0 |
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| Full Reference | Hattori, Keiko, Burgath, Klaus-Peter, Hart, Stanley R. (1992) Os-isotope study of platinum-group minerals in chromitites in Alpine-type ultramafic intrusions and the associated placers in Borneo. Mineralogical Magazine, 56 (383) 157-164 doi:10.1180/minmag.1992.056.383.02 |
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| Plain Text | Hattori, Keiko, Burgath, Klaus-Peter, Hart, Stanley R. (1992) Os-isotope study of platinum-group minerals in chromitites in Alpine-type ultramafic intrusions and the associated placers in Borneo. Mineralogical Magazine, 56 (383) 157-164 doi:10.1180/minmag.1992.056.383.02 |
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| In | (1992, June) Mineralogical Magazine Vol. 56 (383) Mineralogical Society |
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| Abstract/Notes | Abstract187Os/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. |
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