Platinum group element (PGE) geochemistry to understand the chemical evolution of the Earth’s mantle |
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| Authors: | Sisir K Mondal |
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| Institution: | 1.Department of Geological Sciences,Jadavpur University,Kolkata,India;2.Department of Earth and Planetary Sciences,American Museum of Natural History,New York City,USA |
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| Abstract: | Platinum group elements (PGE: Os, Ir, Ru, Rh, Pt, Pd) are important geochemical and cosmochemical tracers. Depending on physical
and chemical behaviour the PGEs are divided into two subgroups: IPGE (Ir, Os, Ru) and PPGE (Pd, Pt, Rh). Platinum group elements
show strong siderophile and chalcophile affinity. Base metal sulfides control the PGE budget of the Earth’s mantle. Mantle
xenoliths contain two types of sulfide populations: (1) enclosed within silicate minerals, and (2) interstitial to the silicate
minerals. In terms of PGE characters the included variety shows IPGE enriched patterns — similar to the melt-depleted mantle
harzburgite, whereas the interstitial variety shows PPGE enriched patterns — resembling the fractionated PGE patterns of the
basalt. These PGE characters of the mantle sulfides have been interpreted to be representative of multi-stages melting process
of the mantle that helped to shape the chemical evolution of the Earth. |
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