Platinum-group minerals in chromitites from the Eastern Rhodope ultramafic complex, Bulgaria
Identifieur interne : 001408 ( Main/Exploration ); précédent : 001407; suivant : 001409Platinum-group minerals in chromitites from the Eastern Rhodope ultramafic complex, Bulgaria
Auteurs : M. Tarkian [Allemagne] ; E. Naidenova [Bulgarie] ; M. Zhelyaskova-Panayotova [Bulgarie]Source :
- Mineralogy and Petrology [ 0930-0708 ] ; 1991-03-01.
Abstract
Summary: The podiform chromitites investigated in the course of this study occur in intensely serpentinized dunites and peridotites of unknown age (paleozoic or older) within a metamorphic complex consisting of gneisses, amphibolites and marbles. Concentrations of platinum group elements (PGE) and the distribution of platinum group minerals (PGM) have been investigated in the chromitite occurrences of Dobromirci and Pletene. PGE concentrations in chromitites vary from 787 to 891 ppb (Dobromirci). The highest value was recorded in chromite ore from Pletene (1274 ppb). The enrichment is due to high contents of Os, Ir and Ru, whereas the contents of Rh, Pt and Pd are relatively low. The Ru-contents (480-600 ppb) are remarkable and correspond to the average content in chondrite Cl. Chondrite-normalized PGE distribution patterns of chromitites of both localities reveal a distinctly negative trend from Ru to Pd, which is typical for chromites from ophiolites. Irrespective of their chemical composition, most chromites carry numerous PGM inclusions which have formed during the magmatic stage at high sulphur fugacity (fs2). In addition to laurite, the main mineral, there are sulpharsenides of Ru-Ir-Os (ruarsite, irarsite, osarsite). Textural aspects and the results of chemical analyses show that the concentration of PGE is not caused by substitution in the lattice of chromite, but by magmatic formation of discrete PGM before or contemporaneously with chromite. All PGM apparently remained unaltered. No evidence for remobilization or redistribution of PGE by serpentinization has been found.
Url:
DOI: 10.1007/BF01167101
Affiliations:
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Tarkian</name><affiliation wicri:level="1"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institute of Mineralogy and Petrology, University of Hamburg, Grindelallee 48, DW-2000, Hamburg 13</wicri:regionArea><placeName><settlement type="city">Hambourg</settlement><region type="land" nuts="2">Hambourg</region></placeName></affiliation></author><author><name sortKey="Naidenova, E" sort="Naidenova, E" uniqKey="Naidenova E" first="E." last="Naidenova">E. Naidenova</name><affiliation wicri:level="3"><country xml:lang="fr">Bulgarie</country><wicri:regionArea>Department of Ore Deposits and Geochemistry, Sofia University, 15 Ruski Blvd., 1000, Sofia</wicri:regionArea><placeName><settlement type="city">Sofia</settlement><region nuts="2">Sofia-ville (oblast)</region></placeName></affiliation></author><author><name sortKey="Zhelyaskova Panayotova, M" sort="Zhelyaskova Panayotova, M" uniqKey="Zhelyaskova Panayotova M" first="M." last="Zhelyaskova-Panayotova">M. 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Concentrations of platinum group elements (PGE) and the distribution of platinum group minerals (PGM) have been investigated in the chromitite occurrences of Dobromirci and Pletene. PGE concentrations in chromitites vary from 787 to 891 ppb (Dobromirci). The highest value was recorded in chromite ore from Pletene (1274 ppb). The enrichment is due to high contents of Os, Ir and Ru, whereas the contents of Rh, Pt and Pd are relatively low. The Ru-contents (480-600 ppb) are remarkable and correspond to the average content in chondrite Cl. Chondrite-normalized PGE distribution patterns of chromitites of both localities reveal a distinctly negative trend from Ru to Pd, which is typical for chromites from ophiolites. Irrespective of their chemical composition, most chromites carry numerous PGM inclusions which have formed during the magmatic stage at high sulphur fugacity (fs2). In addition to laurite, the main mineral, there are sulpharsenides of Ru-Ir-Os (ruarsite, irarsite, osarsite). Textural aspects and the results of chemical analyses show that the concentration of PGE is not caused by substitution in the lattice of chromite, but by magmatic formation of discrete PGM before or contemporaneously with chromite. All PGM apparently remained unaltered. No evidence for remobilization or redistribution of PGE by serpentinization has been found.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Bulgarie</li></country><region><li>Hambourg</li><li>Sofia-ville (oblast)</li></region><settlement><li>Hambourg</li><li>Sofia</li></settlement></list><tree><country name="Allemagne"><region name="Hambourg"><name sortKey="Tarkian, M" sort="Tarkian, M" uniqKey="Tarkian M" first="M." last="Tarkian">M. Tarkian</name></region></country><country name="Bulgarie"><region name="Sofia-ville (oblast)"><name sortKey="Naidenova, E" sort="Naidenova, E" uniqKey="Naidenova E" first="E." last="Naidenova">E. Naidenova</name></region><name sortKey="Zhelyaskova Panayotova, M" sort="Zhelyaskova Panayotova, M" uniqKey="Zhelyaskova Panayotova M" first="M." last="Zhelyaskova-Panayotova">M. Zhelyaskova-Panayotova</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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