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Diverse contributing sources to chromitite petrogenesis in the Shebenik Ophiolitic Complex, Albania: evidence from new PGE- and Os-isotope data

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Summary

Chromitites sampled from four different pseudostratigraphic levels of the Mesozoic Shebenik Ophiolite Complex, Albania, have low PGE totals <1 µg/g but show different types of PGE enrichment (Burgath et al., 2003) as well as differing mineral chemistry, PGM mineralogy and Os isotopic signatures. To circumvent analytical problems with low PGE abundances, representative samples were analyzed using HPA-digestion followed by isotope dilution ICP-MS. Osmium isotopes were determined by ICP-QMS and N-TIMS techniques. Podiform chromitites exposed in the mantle (Group I) and tabular chromitites exposed in the upper mantle (Group II) are Os-Ir-Ru-Rh enriched. In the upper mantle to mantle-crust transition zone, schlieren type chromitites (Group III) are enriched in Ru-Rh with low Os-Ir and low Pt-Pd. Within the mantle-crust transition zone disseminated chromitites in dunite are variably enriched in Ru-Rh-Pt, however, Os, Ir and Pd are low. IPGE rich chromites contain abundant small laurite inclusions whilst Rh and Pt are located in sulfarsenides marginally attached to transition zone chromites (see also Burgath et al., 2003). High Cr/Al ratios (>0.75) and low titanium contents of chromites throughout the sample suite are consistent with chromitite petrogenesis in a SSZ environment. Shebenik mantle chromitites with low 187Re/188Os ratios have an average, slightly suprachondritic initial osmium isotopic composition of 0.1285 ± 0.0022 (2s). Towards higher pseudostratigraphic levels, 187Re/188Os ratios increase and initial Os isotopies are very heterogeneous. Distinctly suprachondritic Os signatures require input of radiogenic source components, whereas subchondritic samples require assimilation of long term Re-depleted PGM.

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Kocks, H., Melcher, F., Meisel, T. et al. Diverse contributing sources to chromitite petrogenesis in the Shebenik Ophiolitic Complex, Albania: evidence from new PGE- and Os-isotope data. Mineralogy and Petrology 91, 139–170 (2007). https://doi.org/10.1007/s00710-007-0194-4

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