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• W2074158306 abstract "Metatholeiite series from Early-Middle Proterozoic basement and cover sequences in the Harts Range, central Australia, display marked differences in trace element abundances and ratios that reflect the chemical heterogeneity of their mantle sources. The trace element data reveal a multistage geochemical evolution for the attendant Proterozoic sub-continental mantle. Early formed (supracrustal) tholeiites from the Oonagalabi and Entia basement gneiss complexes display slight to moderate light rare earth element (LREE) enrichment ((Ce/Yb)N = 1.8–3.9), unfractionated heavy-REE distributions, and chondritic Zr/Nb and Zr/Y ratios. They were generated by variable degrees (15–30%) of partial melting of a relatively undepleted mantle source in an extensional (ensialic rift) environment. Later formed metabasites comprise numerous sills that intrude the supracrustal sequence within the Entia gneiss complex. Primary basaltic liquids for these rocks possessed more strongly fractionated REE levels ((Ce/Yb)N = 3.0–12.3), large ion lithophile (LIL-) element enrichment, and pronounced depletions in high field strength elements. Their high La/Nb, Ba/Zr and Cr/Y ratios resemble those of convergent plate margin basaltic magmas derived from mantle sources that have been metasomatised as a result of subduction-related processes. Metatholeiites from the Harts Range meta-igneous complex in the cover sequence display high Zr/Nb ratios, reflecting a mantle source that was strongly depleted in incompatible elements during a previous melting event. Tholeiites from the lower part of the cover sequence show distinct LIL-element and LREE depletion ((Ce/Yb)N = 0.8–1.0), features resembling depleted (N-type) mid-ocean ridge basalts and some continental tholeiites. Tholeiites from the upper part of the cover sequence show enrichment of highly incompatible LIL-elements, especially Ba and K, relative to REE, and pronounced decoupling between high field strength elements and REE, resulting in high La/Nb ratios. They represent melts derived from a mantle source which has been depleted in a basaltic component and subsequently re-enriched in incompatible elements, e.g., via introduction of a subduction-related component. The inferred mantle evolution is compatible with a tectonic model that involves successive extensional and compressional episodes during repeated ensialic orogenesis, as proposed for the Harts Range basement and cover sequences." @default.
• W2074158306 created "2016-06-24" @default.
• W2074158306 creator A5024414736 @default.
• W2074158306 date "1988-10-01" @default.
• W2074158306 modified "2023-09-26" @default.
• W2074158306 title "Geochemistry of metatholeiites from the Harts Range, central Australia: implications for mantle source heterogeneity in a Proterozoic mobile belt" @default.
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• W2074158306 doi "https://doi.org/10.1016/0301-9268(88)90071-x" @default.
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