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The join grossularite-pyrope at 30 kb and its petrological significance

Maaløe, Sven and Wyllie, Peter J. (1979) The join grossularite-pyrope at 30 kb and its petrological significance. American Journal of Science, 279 (3). pp. 288-301. ISSN 0002-9599. doi:10.2475/ajs.279.3.288.

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The pseudobinary join grossularite-pyrope was investigated at 30 kb nominal pressure at temperatures between 1300° and 1725°C, using piston-cylinder apparatus. Grossularite melts incongruently to gehlenite + liquid at 1545°C, and pyrope melts incongruently to spinel+ liquid at 1705°C. Aluminous diopside forms a congruent compound within the join and melts at 1595°C. The join has two binary eutectics, where diopside is in equilibrium with either grossularite-rich garnet or pyrope-rich garnet. All eutectic compositions are on the join, and the join is a thermal barrier at 30 kb within the system CaSiO_3-MgSiO_3-Al_2O_3. The phase relations suggest that nephelinites might have formed at pressures near or above 30 kb, and that nephelinites fractionate toward a thermal minimum on the garnet + diopside liquid surface, with eclogitic mineralogy.

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Additional Information:© 1979 American Journal of Science. The authors gratefully acknowledge the National Science Foundation for grant EAR 76-20410 and the general support of the Materials Research Laboratory. The senior author being a research visitor at P. J. Wyllie's laboratory gratefully acknowledges grant 511-2919 from the Danish Natural Science Research Council.
Funding AgencyGrant Number
NSFEAR 76-20410
Danish Natural Science Research Council511-2919
Issue or Number:3
Record Number:CaltechAUTHORS:20160203-074923418
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Official Citation:S. Maaloee and P. J. Wyllie The join grossularite-pyrope at 30 kb and its petrological significance Am J Sci March 1, 1979 279:288-301; doi:10.2475/ajs.279.3.288
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64179
Deposited By: Tony Diaz
Deposited On:03 Feb 2016 23:24
Last Modified:10 Nov 2021 23:27

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