Matches in SemOpenAlex for { <https://semopenalex.org/work/W1489332146> ?p ?o ?g. }
Showing items 1 to 77 of
77
with 100 items per page.
- W1489332146 abstract "The petrogenesis of silicic arc magmas is controversial with end-member models of fractional crystallisation and crustal anatexis having been invoked. A prime example of this is the archetypical continental Taupo Volcanic Zone and the adjacent oceanic Kermadec Arc. Insights into the genesis and timescales of magmatic processes of four continental rhyolitic magmas (Whakamaru, Oruanui, Taupo and Rotorua eruptives) and an oceanic (Healy seamount) rhyodacitic magma are documented through micro-analytical chemical studies of melt inclusions and crystal zonation of plagioclase and quartz. Electron probe microanalysis, laser ablation inductively coupled plasma mass spectrometry andFourier transform infrared spectroscopy have been used to measure major, trace and volatile element concentrations, respectively, of melt inclusions and crystals. Melt inclusions are high silica (e.g. 74 - 79 wt%) irrespective of arc setting and display a wide range of trace element compositions (e.g. Sr = 17 - 180 ppm). Taupo Volcanic Zone melt inclusions exhibit higher K2O and Ce/Yb relative to Healy melt inclusions reflecting the assimilation of continental lithosphere. Quantitative trace element modelling of melt inclusion compositions: (a) demonstrates that magma genesis occurred through 62 - 76% fractional crystallisation at Healy whereas assimilation of continental lithosphere (greywacke) in addition to 60 - 80% fractional crystallisation is required for the Taupo Volcanic Zone magmas; and (b) suggests the presence of crystal mush bodies beneath silicic magma chambers in both continental and oceanic arcenvironments. Water concentrations of melt inclusions ranged between 1.4 - 5.1 wt% for the Whakamaru, Taupo and Healy samples. However, the inconsistency in the measured molecular water to hydroxyl concentrations of melt inclusions relative to those determined experimentally for groundmass rhyolitic glasses provide evidence for the degassing of inclusions prior to quenching, by diffusion of hydroxyl groups through the crystal host. Thus, partial pressures of water estimated from the inclusions and inferred depths of the crystallising magma bodies are underestimated. Chemical profiles of mineral zonation, however, indicate a more complex originof silicic melts than simple fractionation and assimilation. For example, trace element modelling of Whakamaru plagioclase suggests that the three distinct textural plagioclase populations present in Whakamaru samples crystallised from four physiochemically discrete silicic melts. This modelling indicates a strongpetrogenetic link between andesitic and silicic magmas from the chemical variation of selected Whakamaru plagioclase crystals possessing high anorthite (45-60 mol %) cores and low anorthite (~ 30 mol %) rim compositions and the interaction of greywacke partial melts. Furthermore, Sr diffusion modelling of core-rim interfaces of the same plagioclase crystals indicate the amalgamation of the magma chamber occurred continuously over the 15,000 years preceding theclimactic eruption. Conversely,…" @default.
- W1489332146 created "2016-06-24" @default.
- W1489332146 creator A5063871996 @default.
- W1489332146 date "2009-01-01" @default.
- W1489332146 modified "2023-09-24" @default.
- W1489332146 title "Micro-Analytical Studies of the Petrogenesis ofSilicic Arc Magmas in the Taupo Volcanic Zoneand Southern Kermadec Arc, New Zealand" @default.
- W1489332146 hasPublicationYear "2009" @default.
- W1489332146 type Work @default.
- W1489332146 sameAs 1489332146 @default.
- W1489332146 citedByCount "0" @default.
- W1489332146 crossrefType "journal-article" @default.
- W1489332146 hasAuthorship W1489332146A5063871996 @default.
- W1489332146 hasConcept C104962623 @default.
- W1489332146 hasConcept C11872896 @default.
- W1489332146 hasConcept C120806208 @default.
- W1489332146 hasConcept C127313418 @default.
- W1489332146 hasConcept C141646446 @default.
- W1489332146 hasConcept C151730666 @default.
- W1489332146 hasConcept C161509811 @default.
- W1489332146 hasConcept C17409809 @default.
- W1489332146 hasConcept C180492444 @default.
- W1489332146 hasConcept C192241223 @default.
- W1489332146 hasConcept C2776698055 @default.
- W1489332146 hasConcept C2778965357 @default.
- W1489332146 hasConcept C2779430719 @default.
- W1489332146 hasConcept C34682378 @default.
- W1489332146 hasConcept C36723533 @default.
- W1489332146 hasConcept C44938399 @default.
- W1489332146 hasConcept C58097730 @default.
- W1489332146 hasConcept C63379926 @default.
- W1489332146 hasConcept C77928131 @default.
- W1489332146 hasConceptScore W1489332146C104962623 @default.
- W1489332146 hasConceptScore W1489332146C11872896 @default.
- W1489332146 hasConceptScore W1489332146C120806208 @default.
- W1489332146 hasConceptScore W1489332146C127313418 @default.
- W1489332146 hasConceptScore W1489332146C141646446 @default.
- W1489332146 hasConceptScore W1489332146C151730666 @default.
- W1489332146 hasConceptScore W1489332146C161509811 @default.
- W1489332146 hasConceptScore W1489332146C17409809 @default.
- W1489332146 hasConceptScore W1489332146C180492444 @default.
- W1489332146 hasConceptScore W1489332146C192241223 @default.
- W1489332146 hasConceptScore W1489332146C2776698055 @default.
- W1489332146 hasConceptScore W1489332146C2778965357 @default.
- W1489332146 hasConceptScore W1489332146C2779430719 @default.
- W1489332146 hasConceptScore W1489332146C34682378 @default.
- W1489332146 hasConceptScore W1489332146C36723533 @default.
- W1489332146 hasConceptScore W1489332146C44938399 @default.
- W1489332146 hasConceptScore W1489332146C58097730 @default.
- W1489332146 hasConceptScore W1489332146C63379926 @default.
- W1489332146 hasConceptScore W1489332146C77928131 @default.
- W1489332146 hasLocation W14893321461 @default.
- W1489332146 hasOpenAccess W1489332146 @default.
- W1489332146 hasPrimaryLocation W14893321461 @default.
- W1489332146 hasRelatedWork W1539153538 @default.
- W1489332146 hasRelatedWork W1904892633 @default.
- W1489332146 hasRelatedWork W1964536500 @default.
- W1489332146 hasRelatedWork W1973104805 @default.
- W1489332146 hasRelatedWork W1982241774 @default.
- W1489332146 hasRelatedWork W1992525388 @default.
- W1489332146 hasRelatedWork W2006095814 @default.
- W1489332146 hasRelatedWork W2058910542 @default.
- W1489332146 hasRelatedWork W2092647301 @default.
- W1489332146 hasRelatedWork W2109325675 @default.
- W1489332146 hasRelatedWork W2111798811 @default.
- W1489332146 hasRelatedWork W2128122984 @default.
- W1489332146 hasRelatedWork W2133914508 @default.
- W1489332146 hasRelatedWork W2137114851 @default.
- W1489332146 hasRelatedWork W2161205090 @default.
- W1489332146 hasRelatedWork W2607173620 @default.
- W1489332146 hasRelatedWork W2751155600 @default.
- W1489332146 hasRelatedWork W2892095746 @default.
- W1489332146 hasRelatedWork W3170635271 @default.
- W1489332146 hasRelatedWork W3150138275 @default.
- W1489332146 isParatext "false" @default.
- W1489332146 isRetracted "false" @default.
- W1489332146 magId "1489332146" @default.
- W1489332146 workType "article" @default.