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Experimental determination of the solubility of carbon dioxide in molten basalt at low pressure

Stolper, Edward and Holloway, John R. (1988) Experimental determination of the solubility of carbon dioxide in molten basalt at low pressure. Earth and Planetary Science Letters, 87 (4). pp. 397-408. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20120821-075251478

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Abstract

We report the first measurements of CO_2 solubility in molten basalt at pressures comparable to those at which submarine basalts erupt. A basalt from the Juan de Fuca ridge was equilibrated with CO_2-rich vapor at 1200°C, 100–1500 bar for up to four hours. After quenching, the glass was analyzed for dissolved carbonate ions by infrared spectroscopy. No forms of dissolved CO_2 other than carbonate were detected. CO_2 solubility is roughly a linear function of pressure at these low pressures. The experimentally determined solubility differs from previous estimates based on CO_2 concentrations of submarine glasses, on CO_2 solubilities in basaltic liquids at significantly higher pressures, and on CO_2 concentrations of glasses equilibrated with H_2O-CO_2 vapor. Our results are compatible with those obtained previously at higher pressures on a molten Kilauea tholeiite only if there is a significant positive dependence of carbonate solubility on temperature. CO_2 contents of mid-ocean ridge glasses measured by infrared spectroscopy are generally higher than would be expected based on solubilities at the hydrostatic pressures for the water depths from which the glasses were recovered, but the lowest dissolved CO_2 contents agree with the experimentally determined solubilities. We propose that submarine glasses with low CO_2 contents were quenched from magmas that were able to degas because they rose slowly from depth. The common occurrence of glasses with dissolved CO_2 contents in excess of the experimentally determined solubility suggests they were quenched from magmas that ascended too rapidly to degas fully. In conjunction with our solubility data, the highest CO_2 contents allow minimum estimates of depths to magma chambers. Depths of ⩾ 2.3 km beneath the ridge are indicated for the East Pacific Rise at 21°N, in agreement with geophysical constraints.


Item Type:Article
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URLURL TypeDescription
http://dx.doi.org/10.1016/0012-821X(88)90004-0DOIUNSPECIFIED
http://www.sciencedirect.com/science/article/pii/0012821X88900040PublisherUNSPECIFIED
Additional Information:© 1988 Elsevier Science Publishers B.V. Received 22 July 1987. Revised 30 November 1987. Available online 24 October 2002. We thank P. Rosener and S. Newman for assistance with the infrared spectroscopic analyses and J. Clark for the electron microprobe analyses. We also thank T. Plank and Professor C. Langmuir of Columbia University for calculating liquidus temperatures of the natural basaltic glasses studied by Fine and Stolper [14] and D.J. Des Marais for a helpful review. The starting material was generously provided by Dr. John Delaney. This work was supported by NSF grants EAR-861728 (J.R.H.), EAR-8417434 (E.M.S.), and EAR- 8618229 (E.M.S.). Caltech Division of Geological and Planetary Sciences Contribution 4493.
Funders:
Funding AgencyGrant Number
NSFEAR-861728
NSFEAR-8417434
NSFEAR-8618229
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Caltech Division of Geological and Planetary Sciences4493
Record Number:CaltechAUTHORS:20120821-075251478
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120821-075251478
Official Citation:Edward Stolper, John R. Holloway, Experimental determination of the solubility of carbon dioxide in molten basalt at low pressure, Earth and Planetary Science Letters, Volume 87, Issue 4, March 1988, Pages 397-408, ISSN 0012-821X, 10.1016/0012-821X(88)90004-0. (http://www.sciencedirect.com/science/article/pii/0012821X88900040)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33387
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:21 Aug 2012 15:17
Last Modified:21 Aug 2012 15:17

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