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

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ID: 308261
1979
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Abstract
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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openalex_W2324497504 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors S. Maaloee, Peter J. Wyllie
Journal american journal of science
Year 1979
DOI
10.2475/ajs.279.3.288
URL
https://ajs.scholasticahq.com/article/60045.pdf
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