WebDec 1, 2008 · The compositional zoning of plagioclase-mantled K-feldspar, defining the rapakivi texture, and of the associated quartz phenocrysts from the Paleozoic Land’s End (U.K.) and Altenberg–Frauenstein (Germany) granites, and the Proterozoic Hammarudda (Finland) granite porphyry, has been investigated by laser-ablation – inductively coupled … WebOct 1, 2001 · Within Zone 2, Ni reaches a maximum of 0.5 apfu before decreasing in the outer 20–40 μm. Zone-2 overgrowths also exhibit compositional polarity such that, at …
(PDF) Compositional zoning in zincian spinel - ResearchGate
WebMay 1, 1994 · Surface structural controls on compositional zoning of SO 2 ... within 1014 sectors document a twofold to threefold difference in SO 2− 4 and SeO 2− 4 contents … WebMay 7, 2024 · Compositional zoning is observed rarely in chrome-spinel grains from slowly-cooled layered intrusions because diffusion of cations continues within the spinel to low temperatures. However, in certain circumstances, such gradational zoning of both … they\u0027re wz
Frontiers Editorial: Crystal Archives of Magmatic Processes
WebJun 1, 2008 · The compositional zoning of plagioclase-mantled K-feldspar, defining the rapakivi texture, and of the associated quartz phenocrysts from the Paleozoic Land’s End (U.K.) and Altenberg ... WebAn electron microprobe study of sector-zoning in clinopyroxenes from the Narce area, Italy shows that the relative order of enrichment of the pyroxene components with trivalent or quadrivalent cations in the M1 sites in the four crystallographically distinct sectors, (100), (110), (010), (1 11), is (100)>(110)>(010)>(1 11). For the crystal showing the largest … Webrapid compositional zoning associated with several minor dissolution phases. Temperatures of formation of siderite cements indicate that the formation of S1 and S3 … they\u0027re x