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Title: Volatile compositions of melt inclusions in Coso Range Rhyolite

Dissolved water and carbon dioxide concentrations were measured in melt inclusions in quartz phenocrysts from rhyolite domes and lava flows in the Coso volcanic field to determine pre-eruptive volatile content of the magma. Inclusions roughly 50--100 microns in diameter were analyzed for dissolved water and carbon dioxide using Fourier transform infrared spectroscopy (FTIR). The glasses have a total water concentration ranging from four to six weight percent and no detectable carbon dioxide. Vapor bubbles in the inclusions about 10--40 microns in diameter were also analyzed for their volatile composition. The spectra show no evidence for carbon dioxide, although significant water is observed. If the melt inclusions were saturated at the time of entrapment, then crystallization occurred between 1,200 and 2,100 bars pressure or greater than 4 kilometers depth.
Authors:
 [1]
  1. (Caltech, Pasadena, CA (United States))
Publication Date:
OSTI Identifier:
5342970
Report Number(s):
CONF-9305259--
Journal ID: ISSN 0016-7592; CODEN: GAAPBC
Resource Type:
Conference
Resource Relation:
Journal Name: Geological Society of America, Abstracts with Programs; (United States); Journal Volume: 25:5; Conference: 89. annual meeting of the Cordilleran Section and the 46th annual meeting of the Rocky Mountain Section of the Geological Society of America (GSA), Reno, NV (United States), 19-21 May 1993
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; CALIFORNIA; GEOLOGIC FORMATIONS; INCLUSIONS; CHEMICAL COMPOSITION; RHYOLITES; CARBON DIOXIDE; EMISSION SPECTROSCOPY; GEOBAROMETRY; GEOCHEMISTRY; INFRARED SPECTRA; WATER CHEMISTRY; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMISTRY; DEVELOPED COUNTRIES; IGNEOUS ROCKS; NORTH AMERICA; OXIDES; OXYGEN COMPOUNDS; ROCKS; SPECTRA; SPECTROSCOPY; USA; VOLCANIC ROCKS 580000* -- Geosciences