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American Mineralogist; April 1983; v. 68; no. 3-4; p. 307-314
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The stability of amphibole in andesite and basalt at high pressures

J. C. Allen, and A. L. Boettcher

Bucknell Univ., Dep. Geol. and Geogr., Lewisburg, PA, United States
Univ. Calif. at Los Angeles, United States

Reinvestigation of earlier work on Mt. Hood andesite and Kilauea olivine tholeiite under N-NO conditions and with silver capsules. The revised curve for the appearance of garnet is significantly lower in pressure; no orthopyroxene appeared in the run products, in contrast to the results of the earlier work. The high-temperature segment of the amphibole-out curve for the tholeiite is at least as high as 1040 degrees C at 13 kbar and 1050 degrees C at 16 kbar, and the high-pressure part of this curve is at about 27 kbars, about 6 kbar higher than in the earlier work. Amphibole is the sole silicate phase on the vapor-saturated liquidus in the andesite at pressures below the garnet-in curve (>15.5 kbar). Revised phase relationships are consistent with the derivation of andesite by amphibole-liquid equilibria in basaltic magma, and reveal stability to depths of nearly 100 km. The great depths to which amphiboles are stable make it probable that they are a source of H 2 O for martial melting in deeply subducted oceanic crust.--Modified journal abstract.

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