Deep generation of magmatic gas on the Moon and implications for pyroclastic eruptions

Details Deep generation of magmatic gas on the Moon and implications for pyroclastic eruptions Deep generation of magmatic gas on the Moon and implications for pyroclastic eruptions

Publishing date

Jun 2003

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30l...7w&link_type=abstract

Journals

Geophysical Research Letters, Volume 30, Issue 12, pp. 7-1, CiteID 1605, DOI 10.1029/2002GL016082

Science

Physics

Additional info 2

11

Additional info 3

Planetary Sciences: Volcanism (8450), Planetology: Solar System Objects: Moon (1221), Volcanology: Eruption Mechanisms

Type

Scientific paper

Abstract

Lunar pyroclastic beads are interpreted to represent primitive magmas derived from great depths and rapidly erupted to the surface in explosive events. However, a detailed mechanism for gas generation at great depth and rapid magma transport to the surface has not yet been described. Furthermore, the pyroclastic beads are not petrogenetically related to basalts erupted near the sampling sites. We propose a model in which these conundrums are resolved through gas build-up in a low-pressure micro-environment near the tip of a magma-filled crack (dike) propagating rapidly from the magma source depth to the surface. The gas rich region consists of a free gas cavity overlying a foam extending vertically for ~20 km. Eruption of the foam results in the widespread emplacement of unfractionated pyroclastic beads. Subsequent ascent of the underlying gas-free picritic magma is unlikely to occur, perhaps accounting for the lack of sampled eruptive equivalents.

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