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• W3213759044 endingPage "125839" @default.
• W3213759044 startingPage "125839" @default.
• W3213759044 abstract "The presence of recycled crust in the lithospheric mantle of the Dharwar craton has been investigated using trace element geochemistry of olivine grains from an ENE-trending Paleoproterozoic picrite dyke (associated with the ca. 1.89–1.88 Ga Hampi dyke swarm) emplaced in the western Dharwar craton. Olivine grains are purely magmatic, formed as early phenocrysts in a fractionated basaltic melt. They exhibit enrichment in NiO contents (0.32–0.43 wt%) and depletion in Ca (1366–2105 ppm), Mn (1578–2663 ppm) and 100 ∗ Mn/Fe (1.28–1.48). Further, the compiled whole-rock geochemical data of the picrite dyke and associated dyke swarm illustrates relatively low CaO/MgO (0.55–1.78), intermediate FeO/MnO (47–54), negative to positive PX# (−0.34 to +1.86), and high values of FC3MS (0.24–0.90) and FCKANTMS (0.19–1.11). These chemical markers are not consistent with the derivation of the primary melt from a pure peridotite or a pyroxenite source; therefore, contribution from a mixed type of source having both peridotite and pyroxenite end members (pyroxene rich and olivine poor lithology) is suggested. The amount of pyroxenite and recycled crust varies from 46% to 86% and 14% to 44%, respectively. The Al-in-olivine based thermometer estimates the maximum crystallization temperature as 1407 °C, which is 137 °C higher than the average temperature of MORB and accordant with several well-established plume-induced large igneous provinces (LIPs) worldwide. Therefore, it is suggested that the studied picrite dyke is derived from a primary melt generated by plume-induced melting of a peridotite-pyroxenite mixed source. The ca. 1.89–1.88 Ga Hampi dyke swarm, being genetically linked with the studied dyke, could also be derived from this same source. Further, the recycled crust in the subcontinental lithospheric mantle of the western Dharwar craton may have generated the pyroxene rich mafic source during the Neoarchean convergence between eastern and western Dharwar craton. • Olivine compositions of a picrite dyke from western Dharwar craton is presented. • Olivine grains are magmatic and derived from a fractionated melt. • The source is pyroxenite and peridotite (olivine poor, pyroxene rich) mixed type. • The Neoarchean convergence may be the cause of this pyroxene-rich source. • The Al-in-olivine thermometry suggests a mantle plume induced melting." @default.
• W3213759044 created "2021-11-22" @default.
• W3213759044 creator A5029425780 @default.
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• W3213759044 creator A5084668308 @default.
• W3213759044 creator A5087389638 @default.
• W3213759044 creator A5089076094 @default.
• W3213759044 date "2022-04-01" @default.
• W3213759044 modified "2023-09-26" @default.
• W3213759044 title "Major and trace element geochemistry of olivine from an ENE-trending picrite dyke, genetically linked to the ca. 1.89–1.88 Ga Hampi swarm, western Dharwar craton: Implications for plume induced melting of a mixed peridotite-pyroxenite source" @default.
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• W3213759044 doi "https://doi.org/10.1016/j.chemer.2021.125839" @default.
• W3213759044 hasPublicationYear "2022" @default.
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