Short-lived oxygen diffusion during hot, deep-seated meteoric alteration of anorthosite.

Details Short-lived oxygen diffusion during hot, deep-seated meteoric alteration of anorthosite. Short-lived oxygen diffusion during hot, deep-seated meteoric alteration of anorthosite.

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sci...286.2323m&link_type=abstract

Science, Vol. 286, No. 5448, p. 2323 - 2325

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Meteorites: Isotopic Abundances

Scientific paper

Heterogeneous oxygen isotope compositions of plagioclase from the Boehls Butte anorthosite include some of the most oxygen-18-depleted values reported for plagioclase in meta-igneous rocks and indicate high-temperature isotopic exchange between plagioclase and nearly pristine meteoric fluid. Retrograde reaction-enhanced permeability assisted influx of meteoric-hydrothermal fluids into the deep-seated anorthosite. Isotopic gradients of about 14 per mil over 600 μm in single crystals require short-lived (about 104years) diffusional exchange of oxygen and locally large effective water:rock ratios, followed by rapid loss of water and cessation of oxygen diffusion in the anorthosite.

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