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Showing 1 to 2 of 2 for “"high-alumina basalt"”.
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The thermal evolution of subduction zone lithosphere: Evidence from the chemical development of Mt. Ruapehu and surrounding vents, New Zealand.
… in the southern TVZ with compositions resembling high-Mg andesite. This contrasts with the central-northern TVZ where the most primitive lavas are high-alumina basalt. The spatial distribution of these two magma series has developed as a result of the evolution of TVZ lithosphere. High-Mg …
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Mineral-Scale Sr Isotopic Study of Plagioclase in the Mafic Dikes of the North American Wall and the Diorite of the Rockslides, Yosemite Valley, California.
… 6.6 to 7.5 per mille (6 samples, average 7.03), higher than the 5.5 + 0.3 range for the mantle, indicating the presence of a crustal component in the system. Plagioclase phenocrysts within each unit display bimodal compositional populations. Subhedral to euhedral partially resorbed calcic cores …