Field measurement of slow metamorphic reaction rates at temperatures of 500° to 600°C

被引:59
作者
Baxter, EF [1 ]
DePaolo, DJ [1 ]
机构
[1] Univ Calif Berkeley, Dept Geol & Geophys, Berkeley, CA 94720 USA
关键词
D O I
10.1126/science.288.5470.1411
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 degrees +/- 17 degrees C to 505 degrees +/- 15 degrees C at pressures up to 9.1 kilobars, the inferred bulk fluid-rock exchange rate is 1.3(-0.4)(+1.1) x 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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页码:1411 / 1414
页数:4
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