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- W2085188166 abstract "The Ongatiti ignimbrite (> ~ 500 km3 DRE) was erupted at 1.21 ± 0.04 Ma from the Mangakino volcanic centre (Taupo Volcanic Zone, New Zealand). The ignimbrite is crystal rich (20–30%), of rhyodacite to low-silica rhyolite composition and lacks any consistent compositional zonation. Pumice whole-rock and glass compositions and crystal rim chemistries imply that the final erupted magma body was, to a first order, homogeneous, with the only variations reflecting crystal:glass proportions in analysed clasts. Crystals from pumices can be divided into two populations based on textural and chemical signatures: those that are inferred to have grown within the final erupted magma body (82% of plagioclase, 88% of orthopyroxene, 17% of amphibole), and those that originated in a chemically heterogeneous mush zone (18% of plagioclase, 12% of orthopyroxene, 83% of amphibole). Crystal-rich microcrystalline clasts, and clots within pumices, provide direct samples of parts of this heterogeneous source region. Amphibole model temperatures and pressures, coupled with in-situ trace element concentrations suggest that the mush region extended to ~ 15 km depth, near the base of the quartzofeldspathic crust and was rich in amphibole. Amphibole plus subordinate plagioclase and orthopyroxene, as well as antecrystic zircon were extracted from the crystal mush and ascended to a final storage region. Model temperatures and pressures from amphibole rims and Fe–Ti oxide model temperatures imply that the final erupted magma body was stored between 770 and 840 °C at 4–6 km depths. Homogenisation of the magma body occurred through convective stirring accompanying gradually rising temperatures induced by less-evolved magma(s) emplaced at deeper levels. Plagioclase records a steady core-to-rim increase in An content, implying that a gradual heating and/or increase in H2O in the final erupted magma body occurred over some significant period prior to the eruption. No signals of a rapid defrosting or rejuvenation event that could be considered as an eruption trigger are recorded by the crystal phases. The Ongatiti ignimbrite has features both common to, and distinct from crystal rich ‘monotonous intermediates’ and crystal-poor compositionally zoned rhyolites. As such, the Ongatiti ignimbrite demonstrates that ‘monotonous rhyolites’ can also be developed on a large scale." @default.
- W2085188166 created "2016-06-24" @default.
- W2085188166 creator A5001131895 @default.
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- W2085188166 date "2014-06-01" @default.
- W2085188166 modified "2023-09-25" @default.
- W2085188166 title "Development, mobilisation and eruption of a large crystal-rich rhyolite: The Ongatiti ignimbrite, New Zealand" @default.
- W2085188166 cites W1864360925 @default.
- W2085188166 cites W1965325568 @default.
- W2085188166 cites W1965817950 @default.
- W2085188166 cites W1967277465 @default.
- W2085188166 cites W1970046654 @default.
- W2085188166 cites W1977039791 @default.
- W2085188166 cites W1977392315 @default.
- W2085188166 cites W1978262868 @default.
- W2085188166 cites W1978432636 @default.
- W2085188166 cites W1980000874 @default.
- W2085188166 cites W1988172937 @default.
- W2085188166 cites W1988339658 @default.
- W2085188166 cites W1989397170 @default.
- W2085188166 cites W1991589759 @default.
- W2085188166 cites W1993169858 @default.
- W2085188166 cites W1993916058 @default.
- W2085188166 cites W1995809323 @default.
- W2085188166 cites W2000574213 @default.
- W2085188166 cites W2003564352 @default.
- W2085188166 cites W2005000918 @default.
- W2085188166 cites W2006207921 @default.
- W2085188166 cites W2012845152 @default.
- W2085188166 cites W2014333968 @default.
- W2085188166 cites W2017853565 @default.
- W2085188166 cites W2026700549 @default.
- W2085188166 cites W2028664107 @default.
- W2085188166 cites W2030306569 @default.
- W2085188166 cites W2033752503 @default.
- W2085188166 cites W2035544006 @default.
- W2085188166 cites W2036011410 @default.
- W2085188166 cites W2037376841 @default.
- W2085188166 cites W2040092205 @default.
- W2085188166 cites W2040659190 @default.
- W2085188166 cites W2046345979 @default.
- W2085188166 cites W2049386485 @default.
- W2085188166 cites W2050019121 @default.
- W2085188166 cites W2052389778 @default.
- W2085188166 cites W2055595543 @default.
- W2085188166 cites W2058002015 @default.
- W2085188166 cites W2059811363 @default.
- W2085188166 cites W2062890233 @default.
- W2085188166 cites W2065830271 @default.
- W2085188166 cites W2067209141 @default.
- W2085188166 cites W2068015389 @default.
- W2085188166 cites W2069342962 @default.
- W2085188166 cites W2075013266 @default.
- W2085188166 cites W2076793534 @default.
- W2085188166 cites W2077932190 @default.
- W2085188166 cites W2078838424 @default.
- W2085188166 cites W2089641758 @default.
- W2085188166 cites W2089759123 @default.
- W2085188166 cites W2090578063 @default.
- W2085188166 cites W2093687160 @default.
- W2085188166 cites W2093710394 @default.
- W2085188166 cites W2094159286 @default.
- W2085188166 cites W2094373534 @default.
- W2085188166 cites W2094582783 @default.
- W2085188166 cites W2095893599 @default.
- W2085188166 cites W2106129266 @default.
- W2085188166 cites W2106625794 @default.
- W2085188166 cites W2107590758 @default.
- W2085188166 cites W2108701335 @default.
- W2085188166 cites W2111659222 @default.
- W2085188166 cites W2116080110 @default.
- W2085188166 cites W2118699879 @default.
- W2085188166 cites W2124448994 @default.
- W2085188166 cites W2128398599 @default.
- W2085188166 cites W2130612399 @default.
- W2085188166 cites W2136990385 @default.
- W2085188166 cites W2139194905 @default.
- W2085188166 cites W2140798780 @default.
- W2085188166 cites W2147136271 @default.
- W2085188166 cites W2147866177 @default.
- W2085188166 cites W2150373067 @default.
- W2085188166 cites W2150990164 @default.
- W2085188166 cites W2153770328 @default.
- W2085188166 cites W2157508130 @default.
- W2085188166 cites W2164870492 @default.
- W2085188166 cites W2167893737 @default.
- W2085188166 cites W2324896590 @default.
- W2085188166 cites W2340888552 @default.
- W2085188166 doi "https://doi.org/10.1016/j.lithos.2014.03.014" @default.
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