NDLI: H2O–CO2–S fluid triggering the 1991 Mount Pinatubo climactic eruption (Philippines)

Content Provider	Springer Nature Link
Author	Borisova, Anastassia Y. Toutain, Jean Paul Dubessy, Jean Pallister, John Zwick, Antoine Salvi, Stefa
Copyright Year	2014
Abstract	The factors that trigger explosive eruptions often remain elusive because of the lack of direct data from representative samples. Here, we report the first micro-Raman spectroscopy measurements of fluid and multiphase inclusions trapped in quartz xenocrysts and microlites from andesitic lavas and basaltic enclaves of the 1991 Mount Pinatubo eruption. Our analyses reveal two-phase H2O–CO2–S inclusions containing a CO2-dominated phase and an aqueous sulfate-bearing liquid phase and, less commonly, anhydrite (CaSO4(solid)). The two fluid phases are low-temperature products of a supercritical H2O–CO2–S fluid which was associated with a hydrous silicate melt prior to eruption. The average density of the CO2 phase is 0.4 ± 0.2 g/cm3 at room temperature, corresponding to a supercritical fluid density of 0.6 ± 0.1 g/cm3 at the conditions of entrapment at 760–1000 °C and up to ∼260 MPa. For the first time, a dense CO2-bearing fluid is reported in Mount Pinatubo volcanic samples. We suggest that this hybrid H2O–CO2–S fluid originated from mixing between sulfur-rich basaltic and hydrous dacitic magmas, as the former was intruded into and interacted with the pre-eruptive Mount Pinatubo dacite magma reservoir, at depths of at least 10 km. Thermodynamic modeling demonstrates that part of the SO2 liberated from the intruded basaltic magma was consumed via interaction with the aqueous fluid-saturated dacitic magma according to the reaction 4SO2 basalt + 4H2Odacite = 3HSO4 - + H2S + 3H+, yielding early Cu-rich sulfides, late abundant anhydrite, and SO4-rich apatites, which are commonly found in the Mount Pinatubo dacites. We suggest that this hybrid H2O–CO2–S fluid played an important role in triggering the 1991 climactic eruption.
Starting Page	1
Ending Page	9
Page Count	9
File Format	PDF
ISSN	02588900
Journal	Bulletin of Volcanology
Volume Number	76
Issue Number	2
e-ISSN	14320819
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-01-31
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mount Pinatubo 1991 Climactic eruption Magmatic chamber Hybrid H2O–CO2–S fluid Fluid inclusion Quartz xenocryst Basaltic enclave Basalt–dacite mixing Geology Geophysics/Geodesy Mineralogy Sedimentology
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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