Distribution of platinum group elements in the Great Serpentinite Belt of New South Wales, Eastern Australia
Identifieur interne : 000F49 ( Main/Exploration ); précédent : 000F48; suivant : 000F50Distribution of platinum group elements in the Great Serpentinite Belt of New South Wales, Eastern Australia
Auteurs : K. Yangs [Australie] ; O. A. R. Thalhammer [Autriche] ; P. K. Seccombe [Australie]Source :
- Mineralogy and Petrology [ 0930-0708 ] ; 1995-09-01.
Abstract
Summary: The distribution of platinum group elements (PGE) within individual lithological units of the dismembered ophiolite of the Great Serpentinite Belt in New South Wales displays distinctive patterns. Within the ophiolite the PGE are mainly magmatic in origin, although the whole sequence has been extensively metamorphosed and deformed. The PGE in this ophiolite demonstrate fractionation resulting from magmatic processes. Harzburgite is characterised by a flat normalised PGE pattern, with only a slight depletion in PPGE. The minor PGE differentiation in the residual mantle rocks is probably due to the control on the PGE distribution by residual alloys and sulfides. This implies that the primary magma, generated from partial melting, was S-saturated. Cumulates of the overlying magmatic sequence show a positively sloped PGE pattern, favouring PPGE enrichment. PGE distribution in the cumulate sequence was controlled by immiscible sulfides, resulting in a similar PGE pattern for individual members of the cumulates. The highest PGE content in the magmatic section is recorded in the banded chromitite where the PGE enrichment probably results from upward-migrating magmatic fluids. Podiform chromitite is the earliest fractionated product from ascending partial melts within narrow magma conduits that channeled melts from the mantle source up to the overlying magma chamber. Such a process operated at high temperatures, hence the high melting-point IPGE was preferentially crystallised along with the chromites so that podiform chromitite displays a negatively sloped PGE pattern. Normally, sulfide saturation in the ascending melt does not take place until the melt enters the crustal magma chamber. However, immiscible sulfide liquids might have been present temporarily in some high-level podiform chromitite to generate a Pt- and Pd-enriched pod. Chromite in this pod is less in both Cr/(Al + Cr) and Mg/(Mg + F2+) than in those of other podiform chromitites that are dominated by IPGE and, therefore, the composition of chromite is of significance in identifying the potential Pt- and Pd-rich chromitites in this ophiolite belt.
Url:
DOI: 10.1007/BF01162861
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Yangs</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Department of Geology, University of Newcastle, 2308, NSW</wicri:regionArea><wicri:noRegion>NSW</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Division of Exploration and Mining, CSIRO, PO Box 136, 2113, North Ryde</wicri:regionArea><wicri:noRegion>North Ryde</wicri:noRegion></affiliation></author><author><name sortKey="Thalhammer, O A R" sort="Thalhammer, O A R" uniqKey="Thalhammer O" first="O. A. R." last="Thalhammer">O. A. R. Thalhammer</name><affiliation wicri:level="1"><country xml:lang="fr">Autriche</country><wicri:regionArea>Institute of Geological Sciences, Mining University, A-8700, Leoben</wicri:regionArea><wicri:noRegion>Leoben</wicri:noRegion></affiliation></author><author><name sortKey="Seccombe, P K" sort="Seccombe, P K" uniqKey="Seccombe P" first="P. K." last="Seccombe">P. K. Seccombe</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Department of Geology, University of Newcastle, 2308, NSW</wicri:regionArea><wicri:noRegion>NSW</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="1995-09-01">1995-09-01</date><biblScope unit="volume">54</biblScope><biblScope unit="issue">3-4</biblScope><biblScope unit="page" from="191">191</biblScope><biblScope unit="page" to="211">211</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: The distribution of platinum group elements (PGE) within individual lithological units of the dismembered ophiolite of the Great Serpentinite Belt in New South Wales displays distinctive patterns. Within the ophiolite the PGE are mainly magmatic in origin, although the whole sequence has been extensively metamorphosed and deformed. The PGE in this ophiolite demonstrate fractionation resulting from magmatic processes. Harzburgite is characterised by a flat normalised PGE pattern, with only a slight depletion in PPGE. The minor PGE differentiation in the residual mantle rocks is probably due to the control on the PGE distribution by residual alloys and sulfides. This implies that the primary magma, generated from partial melting, was S-saturated. Cumulates of the overlying magmatic sequence show a positively sloped PGE pattern, favouring PPGE enrichment. PGE distribution in the cumulate sequence was controlled by immiscible sulfides, resulting in a similar PGE pattern for individual members of the cumulates. The highest PGE content in the magmatic section is recorded in the banded chromitite where the PGE enrichment probably results from upward-migrating magmatic fluids. Podiform chromitite is the earliest fractionated product from ascending partial melts within narrow magma conduits that channeled melts from the mantle source up to the overlying magma chamber. Such a process operated at high temperatures, hence the high melting-point IPGE was preferentially crystallised along with the chromites so that podiform chromitite displays a negatively sloped PGE pattern. Normally, sulfide saturation in the ascending melt does not take place until the melt enters the crustal magma chamber. However, immiscible sulfide liquids might have been present temporarily in some high-level podiform chromitite to generate a Pt- and Pd-enriched pod. Chromite in this pod is less in both Cr/(Al + Cr) and Mg/(Mg + F2+) than in those of other podiform chromitites that are dominated by IPGE and, therefore, the composition of chromite is of significance in identifying the potential Pt- and Pd-rich chromitites in this ophiolite belt.</div></front></TEI><affiliations><list><country><li>Australie</li><li>Autriche</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Yangs, K" sort="Yangs, K" uniqKey="Yangs K" first="K." last="Yangs">K. Yangs</name></noRegion><name sortKey="Seccombe, P K" sort="Seccombe, P K" uniqKey="Seccombe P" first="P. K." last="Seccombe">P. K. Seccombe</name><name sortKey="Yangs, K" sort="Yangs, K" uniqKey="Yangs K" first="K." last="Yangs">K. Yangs</name></country><country name="Autriche"><noRegion><name sortKey="Thalhammer, O A R" sort="Thalhammer, O A R" uniqKey="Thalhammer O" first="O. A. R." last="Thalhammer">O. A. R. Thalhammer</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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