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- W2083221339 abstract "Abstract Pyroclastic eruptions provide a mechanism for the disruption of a compositionally zoned magma body and can result in the formation of homogeneous mixed magmas. The large volume (> 1200 km3) Topopah Spring ash-flow sheet, represents an eruption from a magma body that contained an abrupt compositional interface between a high-silica rhyolite and a quartz latite. The smaller volume ( km 3 ) Pah Canyon ash-flow sheet overlies the Topopah Spring Member, and represents an eruption of a relatively homogeneous magma that is intermediate in composition to the contrasting magmas of the Topopah Spring Member. We propose a model in which the Pah Canyon magma formed by mixing of the high-silica rhyolite and the quartz latite magma that remained in the magma chamber after the eruption of the Topopah Spring ash-flow sheet. Evaluation of this model, using variation diagrams of the major and trace elements, ratio-ratio plots, and least-squares multiple linear regression indicates that the Pah Canyon magma can be derived by mixing of approximately equal volumes of the high-silica rhyolite and the quartz latite end members. Phenocrysts in the mixed magma have reequilibrated and reflect the new composition, temperature and oxygen fugacity conditions." @default.
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- W2083221339 date "1989-02-01" @default.
- W2083221339 modified "2023-09-26" @default.
- W2083221339 title "Magma mixing due to disruption of a layered magma body" @default.
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- W2083221339 doi "https://doi.org/10.1016/0377-0273(89)90072-3" @default.
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