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The transition from pyroxene granulite facies to garnet clinopyroxene granulite facies. Experiments in the system CaO-MgO-Al2O3-SiO2

✍ Scribed by Birger Hansen

Publisher: Springer
Year: 1981
Tongue: English
Weight: 903 KB
Volume: 76
Category: Article
ISSN: 0010-7999
DOI: 10.1007/bf00371963

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✦ Synopsis

The pressure-temperature curve for the equilibrium anorthite + 2 enstatite = pyrope + diopside + quartz has been determined in the system CaO-MgO-A120 2 -SiO 2 to be between 13.4 and 14.0kbars at 900~

The slope up to 1,240~ is 8.5bar/K. The entropy change at 1,200K is 20kJ. These data, combined with data from the literature, lead to a geobarometer equation which, when applied to rocks from the Agto area (West Greenland), gives pressure estimates of 6-10kbars at 800~

The results are consistent for rocks of differing Fe/Mg ratios and are consistent with independent pressure estimates.

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