Basalt-inherited microlites in silicic magmas: evidence from Mt. Pelée (Martinique, F.W.I.). - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Geology Year : 2006

Basalt-inherited microlites in silicic magmas: evidence from Mt. Pelée (Martinique, F.W.I.).

Abstract

During magma ascent in the volcanic conduit, the decompression of a silicic melt may result in the crystallization of morphologically and compositionally specific crystals, designated as microlites. Hence, microlites have been considered as probes of mechanisms and timescales of magma ascent. Some microlites, however, appear to be in strong thermodynamic disequilibrium with their surrounding melt. We present here an experimental data set revealing that these microlites actually grew prior to ascent during mafic recharge of the magma chamber. These microlites have therefore no genetic relation with decompression-induced crystallization processes. Their presence may affect the rheological properties of the melt, as well as crystal growth mechanisms and kinetics during magma ascent.

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Volcanology
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Dates and versions

hal-00081453 , version 1 (23-06-2006)

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Caroline Martel, Ahmed Radadi Ali, Stéphane Poussineau, Alain Gourgaud, Michel Pichavant. Basalt-inherited microlites in silicic magmas: evidence from Mt. Pelée (Martinique, F.W.I.).. Geology, 2006, 34, pp.905-008. ⟨10.1130/G22672A.1⟩. ⟨hal-00081453⟩
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