Trace element abundances of high-MgO glasses from Kilauea, Mauna Loa and Haleakala volcanoes, Hawaii
Article Abstract:
High MgO tholeiite glasses from the Kilauea, Mauna Loa and Haleakala volcanoes in Hawaii exhibit trace element abundance characteristics similar to the typical Hawaiian shield tholeiite. Using ion microprobe, 11 high-MgO tholeiite glasses from the three volcanoes were examined for their rare earth, high field strength and other trace element abundances. Trace and major element characteristics that cross geochemical distinctions between Kilauea and Mauna Loa shield lavas were observed in the glasses from the two volcanoes. These hybrid magmas were produced by a complex zoned source, instead of two separate sources.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
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Melt/harzburgite reaction in the petrogenesis of tholeiitic magma from Kilauea volcano, Hawaii
Article Abstract:
Melt/rock reaction has an important part in the formation of tholeiite magma at Kilauea volcano in Hawaii. Such formation involves a two-stage process. First, decompression melting of garnet lherzolite in a mantle plume produces melts, which are of poorer normative silica compared to tholeiite primary magmas. Next, the melts ascend and assimilate orthopyroxene and crystallizing olivine to commence melt/rock reaction with harzburgite. The reaction's end product is a typical tholeiite primary magma.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
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Evidence of hydrous differentiation and crystal accumulation in the low-MgO, high-AI2O3 Lake Basalt from Medicine Lake volcano, California
Article Abstract:
A study shows that variable porphyritic basalt and basaltic andesite flows and scoria are present in the late Pleistocene Lake Basalt of Medicine Lake volcano, California. Composition and phenocryst abundance of low-MgO, high-Al2O3 mafic magmas, found in convergent margin settings, are similar to these products of the volcano. Hydrous differentiation and plagioclase accumulation are dominant features of these formations.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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