词汇 | kyanite |
释义 | BETA Examples of kyanitekyanite isn’t in the Cambridge Dictionary yet. You can help! Furthermore, the presence of kyanite relics would have been expected. The lower part of the metamorphic sole is composed of kyanite and garnet-bearing mica schist, mica schist, quartzite and marble. The presence of previously unreported kyanite provides important constraints on the pressure estimation. Some garnet, staurolite and kyanite porphyroblasts are fractured, stretched and show asymmetric strain fringes, made of quartz, biotite and chlorite. The lowest temperature reactions observed in the shallower samples produced muscovite with low phengite contents, chlorite, andalusite and kyanite (reactions 15 and 16). Schenk (1984), however, reports the occurrence of retrograde andalusite and kyanite also in the univariant zone. Nearly isobaric cooling led to rehydration and retrogression across the stability field of andalusite up to the stability field of kyanite. Gnos (1998) found kyanite in a garnet amphibolite boulder (unfortunately not in situ). Kyanite was found in melanosomes and mesosomes and, very rarely, also in leucosomes. Rutile and kyanite found as inclusions in garnet are also indicative of higher pressures. |
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