Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.120..511b&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 120, no. 3-4, p. 511-518
Other
1
Andesite, Geothermal Resources, Isotope Effect, Volcanoes, Water, Fractionation, Isotopic Labeling, Rocks, Silicates
Scientific paper
On account of the low porosity of the lithosphere, intracrustal fluids behave very differently from surface fluids, in that they are changing their geochemical and isotopic labels according to the geological environment. Given a heat source, meteoric waters can be supplied plentifully and their rates of throughput in geothermal systems are sufficiently high to exhaust the compositional signals of a given rock buffer. In contrast, fluids exsolved from magma, and subducted fluids, would be supplied at less than about one tenth of the meteoric rate over the life time of a system. Based on up-to-date flow models, the isotopic evolution of meteoric water interacting with crustal rock follows a curved to L-shaped track in the delta D versus delta O-18 plot. Instantaneous (present-day) tie-lines between recharge and discharge are secants of such tracks and can have a range of slopes. At the start of an interaction, waters have delta D and delta O-18 values approaching equilibrium with the original rock composition (water 'W1'). Using known hydrogen isotope fractionation factors, W1 values generally plot in the region of 'andesite' or 'andesitic' waters of various authors. Since the W1 waters have delta D values that are on average more positive, and also less variable than those of the meteoritic recharges, most tracks and tie-lines have positive slopes, and the plotting of a large number of tie-lines will produce a focus on the field of W1 waters, regardless of the original water source.
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