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Melt inclusions in eclogite garnet: experimental study of natural processes |
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| Authors: | AL Perchuk VO Yapaskurt VV Davydova |
| Institution: | aInstitute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, 35 Staromonetnyi per., Moscow, 119017, Russia bInstitute of Experimental Mineralogy, Chernogolovka, 142432, Russia cLomonosov Moscow State University, Geological Department, Vorob’evy Gory, Moscow, 119899, Russia |
| Abstract: | Experiment with poikilitic garnet at 3 GPa and 800 °C showed dehydration melting of its mineral inclusions, which is accompanied by the growth of (sub)euhedral garnet crystals inside the inclusion and/or xenomorphic garnets replacing the host mineral. The newly formed and host garnets differ drastically in composition. The inclusion surface is complicated by specific wedge-like protrusions or thin branches composed of melt or its crystallization products. The above features have been discovered in polymineral inclusions in garnet from low-temperature ( 650 °C) eclogite from the Yukon-Tanana terrane, Canada. The inclusions are interpreted as the crystallization products of in situ formed melt. |
| Keywords: | Eclogite melting garnet inclusions |
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