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Volatile Contents of Izu-Bonin Forearc Volcanic Glasses

Newman, Sally and van der Laan, Sieger R. (1992) Volatile Contents of Izu-Bonin Forearc Volcanic Glasses. Proceedings of the Ocean Drilling Program. Scientific results, 125 . pp. 131-139. ISSN 0884-5891. doi:10.2973/

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Eleven glasses recovered from Holes 786A and 786B were fresh enough for volatile analysis by infrared spectroscopy. The compositions of these glasses range from boninitic to rhyolitic. The glasses from the boninites contain 1.4 to 1.7 wt% H_2O, while the rhyolitic glasses contain 2 to 6 wt% H_2O, and all glasses have less than 30 to 40 ppm CO_2. The highest H_2O contents are probably the result of seawater alteration. The unaltered dacitic to rhyolitic glasses were probably quenched at low pressures corresponding to depths of 0-700 m below the seafloor, also corresponding to the depths of collection of these samples, although the water depths may have been different between the Eocene and the present. The lower boninitic H_2O contents in vesicular glasses suggest shallow quenching on the seafloor.

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Newman, Sally0000-0003-0710-995X
Additional Information:© 1992 Ocean Drilling Program. Date of initial receipt: 1 October 1990; Date of acceptance: 16 July 1991. Support for this work included some funds from NSF grant EAR-8811406.
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Record Number:CaltechAUTHORS:20181026-131820618
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90437
Deposited By: Tony Diaz
Deposited On:26 Oct 2018 20:59
Last Modified:23 Nov 2022 22:11

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