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Degassing-induced crystallization of basaltic magma and effects on lava rheology

Nature volume 317, pages 604–607 (1985)Cite this article

Abstract

During the north-east rift eruption of Mauna Loa volcano, Hawaii, on 25 March–14 April 1984 (Fig. 1), microphenocryst contents of erupted lava increased from 0.5 to 30% without concurrent change in either bulk magma composition or eruption temperature (1,140 ± 3 °C). The crystallization of the microphenocrysts is interpreted here as being due to undercooling of the magma 20–30 °C below its liquidas; the undercooling probably resulted from separation and release of volatiles as the magma migrated 12 km from the primary summit reservoir to the eruption site on the north-east rift zone. Such crystallization of magma during an eruption has not been documented previously. The undercooling and crystallization increased the effective viscosity of the magma, leading to decreased eruption rates and stagnation of the lava flow.

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Authors and Affiliations

  1. US Geological Survey, MS913 DFC, Denver, Colorado, 80225, USA

    Peter W. Lipman

  2. US Geological Survey, Hawaiian Volcano Observatory, Hawaii, 96718, USA

    Norman G. Banks

  3. University of Massachusetts, Amherst, Massachusetts, 01003, USA

    J. Michael Rhodes

Authors
  1. Peter W. Lipman
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  2. Norman G. Banks
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  3. J. Michael Rhodes
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Lipman, P., Banks, N. & Rhodes, J. Degassing-induced crystallization of basaltic magma and effects on lava rheology. Nature 317, 604–607 (1985). https://doi.org/10.1038/317604a0

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