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Volcanic volatiles

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Science  06 Sep 1996:
Vol. 273, Issue 5280, pp. 1313
DOI: 10.1126/science.273.5280.1313d

Detecting the distribution of magmatic volatiles in regions of active volcanism has been difficult because in most systems the magmatic fluids are swamped by the large amount of meteoric water in vigorous hydrothermal systems. Rose and Davidson (p. 1367) present an investigation of hydrothermal springs in the southern Cascades using carbon isotopes; because magmatic waters are old, they contain essentially no carbon-14. Analyses near Mount Lassen show a broad region where magmatic carbon dioxide was present in the hydrothermal system.

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