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Hydrothermal Origin Of Smectite In Volcanic Ash
Abstract Smectite and fine-grained quartz were sepa
Smectite and fine-grained quartz were separated from 6 volcanic ash samples collected in Japan from Shinmoe-dake Volcano, southern Kyushu, and Mt. Usu Volcano, southern Hokkaido. Oxygen isotope ratios of smectite in the volcanic ash range from +6.9 to +12.9 per mill (parts per thousand), which are comparable to the values of smectite (delta(18)O = +6.5 and +9.4 parts per thousand) from currently active geothermal fields. Evaluation of the oxygen isotope data from smectite (delta(18)O = +6.9 and +8.4 parts per thousand) and quartz (delta(18)O = +6.6 to +11.2 parts per thousand) in volcanic ash erupted from Shinmoe-dake in 1959 indicates a hydrothermal origin at elevated temperatures (150 to 270 degrees C) from waters that have calculated delta(18)O values (delta(18)O = -3 to +5 parts per thousand) that are enriched relative to local meteoric water (delta(18)O = -7 to +8 parts per thousand). This precludes an authigenic formation of the smectites under ambient temperatures in crater lakes and/or somma-atrios which had been previously proposed as a plausible mechanism. A peculiar clay flow was extruded on the somma-atrio of Mt. Usu Volcano. The isotopic composition of the clay (<0.5 mu m, delta(18)O = + 12.2 parts per thousand) and evidence from geophysical exploration over volcanic vents of Shinmoe-dake support the concept that extensive hydrothermal alteration is taking place within volcanic vents.
ion is taking place within volcanic vents.  +
Author C. Mizota  + , K. Faure  +
Citation C. Mizota,K. Faure. 1998. [[Hydrothermal Origin Of Smectite In Volcanic Ash]]. Clays and Clay Minerals. <span title="Missing required info" style="font-weight:bold;color:red;">(!)[[Category:Missing Required Information]]</span> .  +
Document type Journal Article  +
Name Hydrothermal Origin Of Smectite In Volcanic Ash  +
PublicationDate 1998  +
Publisher Clays and Clay Minerals  +
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Hydrothermal Origin Of Smectite In Volcanic Ash + , Hydrothermal Origin Of Smectite In Volcanic Ash +
Categories References , Missing Required Information
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03:23:08, 19 September 2014  +
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