FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2006207921> ?p ?o ?g. }

• W2006207921 endingPage "203" @default.
• W2006207921 startingPage "175" @default.
• W2006207921 abstract "The Mangakino volcanic centre is a rhyolitic caldera complex situated in the western part of Taupo Volcanic Zone. Eruptive units ascribed to Mangakino volcanic centre have produced a sequence of voluminous (> 1,100 km3), widespread welded and non-welded ignimbrites, phreatomagmatic fall deposits, and minor lava domes, mostly erupted in two concentrated periods of caldera-forming eruptions from 1.62 to 1.51 Ma, and 1.23 to 0.91 Ma. Geochemical, mineralogical, and Sr and Nd isotopic data are presented for the five main welded ignimbrites (Ngaroma, Ongatiti, Ahuroa. Rocky Hill, and Marshall), with particular emphasis on the Ongatiti, Ahuroa and Marshall ignimbrites. Most previous studies of the rhyolitic eruptives from the Taupo Volcanic Zone have concluded there is little, if any, compositional variation in individual units. The chemistry of the pumice clasts in the welded Mangakino ignimbrites indicate that they show significant compositional variations from low- to high-silica rhyolite (69–77% SiO2), and from dacite to high-silica rhyolite (65–76% SiO2) in the Ahuroa. The pumices have widely variable major- and trace-element compositions at any given stratigraphic level and there is no systematic variation in the composition of pumice with stratigraphic height. This implies that the Mangakino magma chambers were originally compositionally zoned, but the zonation was disrupted by pre- and syn-eruptive mixing processes. The ignimbrites cannot represent simple inverted magma chambers. The original compositional variation is considered to have been produced in part by crystal-liquid fractionation involving all the phenocryst (plagioclase, ferrohypersthene, hornblende, Fe-Ti oxides) and accessory (zircon, apatite) phases, although other magmatic processes such as magma mixing also probably occurred. Evidence from REE abundances and isotopic data suggest that the Mangakino magmas were derived from multiple sources, which included: (1) partial melting of a crustal source similar in composition to a western basement greywacke or its metamorphic equivalent; (2) a plagioclase-rich plutonic or metamorphic source similar to an anorthosite or trondhjemite: and (3) a minor upper mantle mafic source. The Ahuroa Ignimbrite contains discrete rhyolitic and dacitic pumices that have contrasting REE abundances, incompatible-element ratios, and Sr isotopic compositions indicating that they were derived from different sources, but these pumice clasts occur adjacent to each other within the same flow unit, implying that there has also been mixing of discrete bodies of magma prior to or during eruption. The existence of compositional zoning in Mangakino magmas, as opposed to the generally homogeneous rhyolite magmas in the eastern centres within the Taupo Volcanic Zone, could be explained by lower heat flows. Mangakino predated or lay west of the main region of triggering and convection-inducing effects of rising mantle-derived magmas, and also the dominant zone of faulting and crustal extension within the Taupo Volcanic Zone. This lower level of magmatic and tectonic activity may have permitted compositional zoning and more stable stratified conditions to develop in Mangakino magma chambers." @default.
• W2006207921 created "2016-06-24" @default.
• W2006207921 creator A5001131895 @default.
• W2006207921 creator A5004172350 @default.
• W2006207921 creator A5006614172 @default.
• W2006207921 creator A5018303932 @default.
• W2006207921 creator A5050263740 @default.
• W2006207921 creator A5070365231 @default.
• W2006207921 creator A5087655690 @default.
• W2006207921 date "1993-06-01" @default.
• W2006207921 modified "2023-09-26" @default.
• W2006207921 title "Geochemical zoning and eruptive mixing in ignimbrites from Mangakino volcano, Taupo Volcanic Zone, New Zealand" @default.
• W2006207921 cites W1519739705 @default.
• W2006207921 cites W1964097615 @default.
• W2006207921 cites W1971662275 @default.
• W2006207921 cites W1982308317 @default.
• W2006207921 cites W1985014088 @default.
• W2006207921 cites W1988021274 @default.
• W2006207921 cites W1988747937 @default.
• W2006207921 cites W1992563126 @default.
• W2006207921 cites W1998099430 @default.
• W2006207921 cites W2001823729 @default.
• W2006207921 cites W2002647826 @default.
• W2006207921 cites W2007069500 @default.
• W2006207921 cites W2011746009 @default.
• W2006207921 cites W2018743105 @default.
• W2006207921 cites W2019682842 @default.
• W2006207921 cites W2020191076 @default.
• W2006207921 cites W2020425839 @default.
• W2006207921 cites W2021781213 @default.
• W2006207921 cites W2022514599 @default.
• W2006207921 cites W2022696550 @default.
• W2006207921 cites W2023493420 @default.
• W2006207921 cites W2028126209 @default.
• W2006207921 cites W2030248034 @default.
• W2006207921 cites W2031950474 @default.
• W2006207921 cites W2032760515 @default.
• W2006207921 cites W2038356750 @default.
• W2006207921 cites W2040715870 @default.
• W2006207921 cites W2051785803 @default.
• W2006207921 cites W2060688546 @default.
• W2006207921 cites W2067209141 @default.
• W2006207921 cites W2069077297 @default.
• W2006207921 cites W2069653303 @default.
• W2006207921 cites W2071840032 @default.
• W2006207921 cites W2074319620 @default.
• W2006207921 cites W2081337474 @default.
• W2006207921 cites W2081914553 @default.
• W2006207921 cites W2094159286 @default.
• W2006207921 cites W2154585316 @default.
• W2006207921 cites W2159082531 @default.
• W2006207921 cites W2160932031 @default.
• W2006207921 cites W2167893737 @default.
• W2006207921 cites W2312418040 @default.
• W2006207921 cites W2328421945 @default.
• W2006207921 cites W2333858299 @default.
• W2006207921 doi "https://doi.org/10.1016/0377-0273(93)90016-k" @default.
• W2006207921 hasPublicationYear "1993" @default.
• W2006207921 type Work @default.
• W2006207921 sameAs 2006207921 @default.
• W2006207921 citedByCount "74" @default.
• W2006207921 countsByYear W20062079212012 @default.
• W2006207921 countsByYear W20062079212013 @default.
• W2006207921 countsByYear W20062079212014 @default.
• W2006207921 countsByYear W20062079212015 @default.
• W2006207921 countsByYear W20062079212016 @default.
• W2006207921 countsByYear W20062079212017 @default.
• W2006207921 countsByYear W20062079212018 @default.
• W2006207921 countsByYear W20062079212019 @default.
• W2006207921 countsByYear W20062079212020 @default.
• W2006207921 countsByYear W20062079212021 @default.
• W2006207921 countsByYear W20062079212022 @default.
• W2006207921 countsByYear W20062079212023 @default.
• W2006207921 crossrefType "journal-article" @default.
• W2006207921 hasAuthorship W2006207921A5001131895 @default.
• W2006207921 hasAuthorship W2006207921A5004172350 @default.
• W2006207921 hasAuthorship W2006207921A5006614172 @default.
• W2006207921 hasAuthorship W2006207921A5018303932 @default.
• W2006207921 hasAuthorship W2006207921A5050263740 @default.
• W2006207921 hasAuthorship W2006207921A5070365231 @default.
• W2006207921 hasAuthorship W2006207921A5087655690 @default.
• W2006207921 hasConcept C104962623 @default.
• W2006207921 hasConcept C107504934 @default.
• W2006207921 hasConcept C113754120 @default.
• W2006207921 hasConcept C12015391 @default.
• W2006207921 hasConcept C120806208 @default.
• W2006207921 hasConcept C127313418 @default.
• W2006207921 hasConcept C138170599 @default.
• W2006207921 hasConcept C146348940 @default.
• W2006207921 hasConcept C17409809 @default.
• W2006207921 hasConcept C182402614 @default.
• W2006207921 hasConcept C183222429 @default.
• W2006207921 hasConcept C192241223 @default.
• W2006207921 hasConcept C25822816 @default.
• W2006207921 hasConcept C49708893 @default.
• W2006207921 hasConcept C55953714 @default.
• W2006207921 hasConcept C56709687 @default.
• W2006207921 hasConcept C6494504 @default.

• next