TH DHANAKUMAR SINGH
Articles written in Journal of Earth System Science
Volume 130 All articles Published: 16 August 2021 Article ID 0168 Research article
Understanding the role of chalcophile-siderophile elements in the petrogenesis of metabasalts of Kudremukh greenstone belt, western Dharwar Craton, India: A Platinum group elements geochemical perspective
The Meso-Neoarchean Kudremukh greenstone belt (KGB) of Western Dharwar craton comprises predominant metabasalts associated with banded iron formations (BIFs). The metabasalts are characterized by moderate MgO (7.23–8.97 wt.%), Ni (48–374 ppm), Cr (33–188 ppm) with a wide variation in $\Sigma$PGE (21.8–215.7 ppb) contents with 15.8–115.9 ppb Pd, 3.7–105.2 ppb Pt and 0.7–8.5 ppb Rh. Among IPGE group, Iridium, Osmium and Ruthenium range from 0.2–5.9, 1.4–7 and 1.8–7.8 ppb, respectively. These metabasalts are relatively enriched in $\Sigma$PPGE (21.8–215.7 ppb) than $\Sigma$IPGE contents (3.6–18.6 ppb). Their Pd/Ir (7.6–100.7) and Pd/Pt (0.8–5.5) ratios correspond to moderate to lower degree of melting. The abundance of PGEs in Kudremukh metabasalts is dominantly controlled by sulphide and chromite fractionation trend of the parent magma. Sulphur undersaturated nature of the parent magma is evidenced through the relationship of Pd
$\bullet$ PGE systematics on the metabasalts from Kudremukh greenstone belt, western Dharwar Craton, India.
$\bullet$ The KGB metabasalts are characterised by low- moderate degrees of partial melting and high degrees of sulphide fractionation.
$\bullet$ PGE geochemistry of the KGB metabasalts infers the early sulphur undersaturated nature of magmas.
Volume 130, 2021
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