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Insight into monogenetic eruption processes at Pelagatos volcano, Sierra Chichinautzin, Mexico: a combined melt inclusion and physical volcanology study

By
Julie Roberge
Julie Roberge
1
ESIA-Ticoman, Instituto Politecnico Nacional, Del. Gustavo A. Madero, 07340 Mexico, D.F, Mexico
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Marie-Noëlle Guilbaud
Marie-Noëlle Guilbaud
2
Instituto de Geofísica, Universidad Nacional Autónoma de México, Coyoacán, 04510 Mexico, D.F., Mexico
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Celestine N. Mercer
Celestine N. Mercer
3
Central Mineral & Environmental Resources Science Center, US Geological Survey, Denver, CO 80225, USA
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Paola C. Reyes-Luna
Paola C. Reyes-Luna
4
Facultad de Ingeniería, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico, D.F., Mexico
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Published:
January 01, 2015

Abstract

Eruptions and magma evolution of monogenetic volcanoes are thought to be controlled by rapid ascent of magmas over a short period of time. Volatiles degassing from magmas control the ascent velocity and therefore eruption intensity. Complex feedbacks exist between the rate and extent of volatile exsolution at shallow levels and groundmass crystallization, affecting the magma rheology, extent of fragmentation, resulting eruptive style and related hazards. Melt inclusions record the volatile contents and compositions of melts at various stages during their evolution, providing insights into degassing–crystallization processes at shallow crustal levels. Here we present new volatile and major element data from olivine-hosted melt inclusions from Pelagatos scoria cone, Mexico. These new data, combined with recent geochemical and textural data on Pelagatos eruptive products, allow us to propose a model for shallow magmatic processes at this volcano. Discharge of volatile-poor, low-viscosity magma drives early effusive activity along the fissure. Decreasing magma fluxes lead to the clogging of the fissure and the formation of a shallow magma reservoir where degassing and fractional crystallization take place. Subsequent explosive cone-forming activity is triggered by influx of deeper (c. 5 km), less evolved, more volatile-rich magma into this shallow (c. 1 km) reservoir.

Supplementary material:

new whole rock and matrix glass date are available at www.geolsoc.org.uk/SUP18782.

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Contents

Geological Society, London, Special Publications

The Role of Volatiles in the Genesis, Evolution and Eruption of Arc Magmas

G. F. Zellmer
G. F. Zellmer
Massey University, New Zealand
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M. Edmonds
M. Edmonds
University of Cambridge, UK
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S. M. Straub
S. M. Straub
Columbia University, USA
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Geological Society of London
Volume
410
ISBN electronic:
9781862396982
Publication date:
January 01, 2015

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