Field Measurement of Slow Metamorphic Reaction Rates at Temperatures of 500° to 600°C

Details Field Measurement of Slow Metamorphic Reaction Rates at Temperatures of 500° to 600°C Field Measurement of Slow Metamorphic Reaction Rates at Temperatures of 500° to 600°C

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000sci...288.1411b&link_type=abstract

Science, Volume 288, Issue 5470, pp. 1411-1414 (2000).

Physics

10

Scientific paper

High-temperature metamorphic reaction rates were measured using strontium isotopic ratios of garnet and whole rock from a field site near Simplon Pass, Switzerland. For metamorphic conditions of cooling from 612° +/- 17°C to 505° +/- 15°C at pressures up to 9.1 kilobars, the inferred bulk fluid-rock exchange rate is 1.3-0.4+1.1 × 10-7 grams of solid reacted per gram of solid per year, several orders of magnitude lower than laboratory-based estimates. The inferred reaction rate suggests that mineral chemistry may lag the evolving conditions in Earth's crust during mountain building.

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