A Barometer for Garnet Amphibolites and Garnet Granulites |
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Authors: | BOHLEN STEVEN R; LIOTTA JUDITH J |
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Institution: | Department of Earth and Space Sciences, The State University of New York Stony Brook, New York 11794 |
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Abstract: | new barometer based on the equilibrium:
has been calibrated with experiments conducted in the piston-cylinderapparatus. Reversed equilibria have been obtained using well-calibrated2-54 cm NaCl furnace assemblies, Ag80Pd20capsules withfO2 bufferedat or near iron-wustite. The equilibrium is located between10.610.8,12.012.2, 13.213.4 and 14.214.4kb, at 800, 900, 1000, and 1100?C, respectively. The barometer is applicable in both garnet-bearing amphibolitesand granulites. Its greatest potential is in garnet amphiboliteswherein multi-variant amphibole-bearing mineral assemblagesdo not define pressure and few, if any, well-calibrated barometersare available. Application of the garnet-rutile-ilmenite-plagioclase-quartzbarometer in amphibolite and granulite terranes yields geologicallyreasonable pressures that are in agreement with other well-calibratedbarometers in those terranes where comparisons can be made. |
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