Platinum-group minerals in the chromitites from the Great Serpentinite Belt, NSW, Australia
Identifieur interne : 001050 ( Main/Exploration ); précédent : 001049; suivant : 001051Platinum-group minerals in the chromitites from the Great Serpentinite Belt, NSW, Australia
Auteurs : Kai Yang [Australie] ; Philip K. Seccombe [Australie]Source :
- Mineralogy and Petrology [ 0930-0708 ] ; 1993-06-01.
Abstract
Summary: Occurrences of platinum-group minerals (PGM) from chromitites of the Great Serpentinite Belt of New South Wales are reported for the first time in this study. On the basis of their major components, these minerals are classified into various groups, including sulphides, sulpharsenides, arsenides, antimonides, amalgams, and alloys of Os-Ir-Ru-(Fe Ni), Pd Cu Sn, Ni-Fe-Pt-Pd, Pd-Pb-Cu, and Rh-Sn-Cu. They are present: (i) as inclusions within chromite, (ii) in interstitial silicates, (iii) in ferritchromite and (iv) along fractures in chromite. Ir-subgroup (Ir, Os, Ru) minerals (IPGM) dominate podiform chromitites hosted by upper mantle serpentinised harzburgite, whereas Pdsubgroup (Pd, Pt, Rh) minerals (PPGM) characterise banded chromitites in cumulates of the overlying magmatic series. A highly brecciated podiform chromitite, however, is distinguished by abundant disseminated PPGM containing Sb ± Cu. Primary magmatic PGM in podiform chromitite comprise IPGM sulphides, sulpharsenides, and alloys, whereas hydrothermal PGM are characterised by PPGM alloys with Hg, Sb, and Cu. Dominantly hydrothermal PGM in the banded chromitites formed by remobilisation of primary magmatic PGM during serpentinisation. The contrast in PGM association is related to the crystallisation of the host chromitites; IPGM crystallised early from the parental magma along with podiform chromitite, but PPGM formed later at lower temperatures during crystallisation of banded chromitite.[▭
Url:
DOI: 10.1007/BF01161571
Affiliations:
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Seccombe</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Department of Geology, The University of Newcastle, 2308, Callaghan, New South Wales</wicri:regionArea><wicri:noRegion>New South Wales</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Mineralogy and Petrology</title><title level="j" type="abbrev">Mineralogy and Petrology</title><idno type="ISSN">0930-0708</idno><idno type="eISSN">1438-1168</idno><imprint><publisher>Springer-Verlag</publisher><pubPlace>Vienna</pubPlace><date type="published" when="1993-06-01">1993-06-01</date><biblScope unit="volume">47</biblScope><biblScope unit="issue">2-4</biblScope><biblScope unit="page" from="263">263</biblScope><biblScope unit="page" to="286">286</biblScope></imprint><idno type="ISSN">0930-0708</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0930-0708</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Summary: Occurrences of platinum-group minerals (PGM) from chromitites of the Great Serpentinite Belt of New South Wales are reported for the first time in this study. On the basis of their major components, these minerals are classified into various groups, including sulphides, sulpharsenides, arsenides, antimonides, amalgams, and alloys of Os-Ir-Ru-(Fe Ni), Pd Cu Sn, Ni-Fe-Pt-Pd, Pd-Pb-Cu, and Rh-Sn-Cu. They are present: (i) as inclusions within chromite, (ii) in interstitial silicates, (iii) in ferritchromite and (iv) along fractures in chromite. Ir-subgroup (Ir, Os, Ru) minerals (IPGM) dominate podiform chromitites hosted by upper mantle serpentinised harzburgite, whereas Pdsubgroup (Pd, Pt, Rh) minerals (PPGM) characterise banded chromitites in cumulates of the overlying magmatic series. A highly brecciated podiform chromitite, however, is distinguished by abundant disseminated PPGM containing Sb ± Cu. Primary magmatic PGM in podiform chromitite comprise IPGM sulphides, sulpharsenides, and alloys, whereas hydrothermal PGM are characterised by PPGM alloys with Hg, Sb, and Cu. Dominantly hydrothermal PGM in the banded chromitites formed by remobilisation of primary magmatic PGM during serpentinisation. The contrast in PGM association is related to the crystallisation of the host chromitites; IPGM crystallised early from the parental magma along with podiform chromitite, but PPGM formed later at lower temperatures during crystallisation of banded chromitite.[▭</div></front></TEI><affiliations><list><country><li>Australie</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Yang, Kai" sort="Yang, Kai" uniqKey="Yang K" first="Kai" last="Yang">Kai Yang</name></noRegion><name sortKey="Seccombe, Philip K" sort="Seccombe, Philip K" uniqKey="Seccombe P" first="Philip K." last="Seccombe">Philip K. Seccombe</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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