Fluid flow and stable isotopic alteration in rocks at elevated temperatures with applications to metamorphism

Details Fluid flow and stable isotopic alteration in rocks at elevated temperatures with applications to metamorphism Fluid flow and stable isotopic alteration in rocks at elevated temperatures with applications to metamorphism

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.3539d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 9, pp.3539-3550

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Scientific paper

A simple model quantitatively predicts the shifts in stable isotope composition that result from fluid flow through rocks along a temperature gradient in flow systems where local fluid-rock isotope exchange equilibrium is attained. Equilibrium fluid flow along a temperature gradient is a potent mechanism for stable isotopic alteration in rocks: for example, a time-integrated fluid flux of 1 · 10 5 mol H 2 O/ cm 2 flowing through a carbonate or quartzo-feldspathic rock at 600° C along a temperature gradient of +25°C/km will cause 18 O to decrease by 5 . Using the model, measured isotopic shifts in rocks can be quantitatively interpreted as records of time-integrated fluid flux and of flow direction relative to fossil temperature gradients in metamorphic terranes and other high-temperature, deep-crustal fluid flow systems. Inferred whole-rock 18 O-depletions of 5-8 in contact and regional metamorphic terranes can be explained by flow of 2-50 · 10 4 mol/cm 2 aqueous fluids through rocks in the direction of increasing temperature if local mineral-fluid equilibrium is maintained. Stable isotope alteration in metamorphic rocks does not require infiltration of chemically exotic, non-equilibrium fluids, and therefore does not necessarily provide information about the source of infiltrating fluids.

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