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- W2186747383 abstract "Summary K-feldspar megacrysts are common in granitoids, but rare in chemically equivalent volcanic rocks, of which the Taapaca dacites are the best known. Sanidine megacrysts up to 10 cm long occur in some of the lavas, and contain abundant chadocrysts of plagioclase, sanidine, amphibole and oxides, as well as glassy magmatic inclusion and voids. Chadocrysts are generally isolated from the host by a thin film of glass. The matrix contains abundant plagioclase crystals, as well as amphiboles and oxides. Both megacrysts and host lavas were imaged using cold-cathode cathodoluminescence. Growth of the megacrysts engulfed plagioclase, sanidine and amphibole crystals. Crystal size distributions (CSD) of sanidine megacrysts are humpshaped. Large crystals are euhedral and small crystals are rounded. These data show that megacrysts developed from the host magma by coarsening: this was enabled by cycling of the temperature of the magma around the sanidine liquidus temperature in response to injections of more mafic magmas and subsequent magmatic overturns. Chemical zonation of the megacrysts reflects heterogeneity of the host magma and not transfer of crystals from other magmas. Plagioclase crystals enclosed in the megacrysts are small and have straight CSDs, which contrasts with the hump-shaped CSDs of plagioclase in the matrix. This shows that plagioclase was also coarsened, starting at the same time as the growth of the sanidine crystals and continuing afterwards." @default.
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- W2186747383 date "2010-01-01" @default.
- W2186747383 modified "2023-09-27" @default.
- W2186747383 title "Origin of K-feldspar Megacrysts in Dacites from Taapaca Volcano, Chile: Cathodoluminescence Imaging and Quantitative Petrological Evidence" @default.
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