High Ni and low Mn/Fe in olivine phenocrysts of the Karoo meimechites do not reflect pyroxenitic mantle sources
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DOI: 10.1016/j.chemgeo.2017.08.002
Abstract: Abstract Nickel contents and Mn/Fe in olivine phenocrysts have been suggested to reflect the mineral composition of the mantle source of the host magma. This hypothesis is tested here against a well-characterized suite of meimechitic… read more here.
Keywords: mantle; low olivine; high low; phenocrysts karoo ... See more keywords
Silica-enriched mantle sources of subalkaline picrite-boninite-andesite island arc magmas
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DOI: 10.1016/j.gca.2016.09.030
Abstract: Primary arc melts may form through fluxed or adiabatic decompression melting in the mantle wedge, or via a combination of both processes. Major limitations to our understanding of the formation of primary arc melts stem… read more here.
Keywords: magmas; arc; primary arc; silica ... See more keywords