Synthesis of pyrope–grossular garnets: an experimental study at P = 2.5 GPa |
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Authors: | A Orlando D Borrini |
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Institution: | (1) C.N.R., Istituto di Geoscienze e Georisorse, Sezione di Firenze, Firenze, Italy, IT;(2) Dipartimento di Scienze della Terra, Università di Firenze, Firenze, Italy, IT |
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Abstract: | Summary ?In order to evaluate the stability of Mg–Ca garnets at P = 2.5 GPa/T = 800–1500 °C, some experiments were performed using
both natural and synthetic starting materials. Particular attention was paid to the investigation of the Ca rich side of the
pyrope–grossular join and the maximum pyrope content in grossular was found to be about 10 mol.%. The addition of Cr to the
system only slightly increases the observed pyrope solubility in grossular whereas Na stabilises melilite and merwinite. Clinopyroxene
with a composition lying on the diopside – Ca Tschermak join appears to be the only stable crystalline phase in the middle
part of the pyrope–grossular join.
Received August 28, 2001; revised version accepted July 23, 2002
Published online February 24, 2003 |
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