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- W2078922406 abstract "Buchitic sedimentary xenoliths, a few centimetres to several decimetres diameter, occur in Recent andesite from Mount Ngauruhoe, Tongariro Volcanic Center, Taupo Volcanic Zone, New Zealand. Bulk chemistry and Sr isotope compositions of the xenoliths indicate that they are greywacke and argillite derived from Mesozoic Torlesse terrane basement that partly underlies the Taupo Volcanic Zone. The xenoliths contain up to 80% glass with quartz, apatite and zircon remaining as unmelted phases. Glasses within the xenoliths are peraluminous (A/CNK = 1.0 − 1.4), have high normative corundum (2–7%), appreciable FeO (2–4 wt.%), MgO (0.2–1.5 wt.%), TiO2 (0.17–0.84 wt.%), relatively high normative An (1.0–5.3%), and do not represent S-type granitic melts. In the argillite the glass has higher amounts of AI2O3, FeO, MgO, CaO and K2O, and has less SiO2 and Na2O than glass in the greywacke. Silica-rich glass (up to 80 wt.% SiO2) surrounds partially melted quartz. Variable glass chemistry reflects the heterogeneous (layered) nature of the xenoliths. Cordierite (Mg/(Mg + Fe + Mn) = 0.78-0.58), orthopyroxene (En43–56), Mg-rich ilmenite, rutile, pleonaste, V-Cr-Ti spinel, and pyrrhotite occur in the glass of the xenoliths. The dominant cordierite, orthopyroxene, spinel assemblage can be accounted for by disequilibrium breakdown reactions under low oxidation conditions < QFM) involving phengite and chlorite which are abundant in Torlesse greywacke and argillite cropping out along the eastern side of the Taupo Volcanic Zone. Comparison with glass compositions and phase relations of disequilibrium melting experiments on Torlesse greywacke and argillite indicates a minimum temperature of 775°C and a maximum pressure of 1.5 kbar for fusion of the xenoliths that underwent a rapid rate of heating at a depth of less than 5 km and a cooling period constrained by the time of quenching when they were erupted." @default.
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- W2078922406 date "1988-11-01" @default.
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- W2078922406 title "Buchitic metagreywacke xenoliths from Mount Ngauruhoe, Taupo Volcanic Zone, New Zealand" @default.
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- W2078922406 doi "https://doi.org/10.1016/0377-0273(88)90017-0" @default.
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