Exploring intrusive processes through the crystal cargo of volcanic rocks: The case of lava flows from Taranaki volcano, New Zealand

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dc.citation.volume667
dc.contributor.authorD'Mello NG
dc.contributor.authorZellmer GF
dc.contributor.authorUbide T
dc.contributor.authorCaulfield J
dc.contributor.authorUsuki M
dc.contributor.authorIizuka Y
dc.contributor.authorKereszturi G
dc.contributor.authorProcter JN
dc.contributor.authorStewart RB
dc.contributor.editorRomano C
dc.date.accessioned2024-10-21T22:16:56Z
dc.date.available2024-10-21T22:16:56Z
dc.date.issued2024-11
dc.description.abstractThe present-day edifice of Taranaki volcano, New Zealand, is largely made up of lava flows extruded over approximately the last 8 kyr. The crystal cargo of plagioclase, pyroxene and amphibole in these lavas displays varied major, minor, and trace element zoning patterns, pointing to long and complex crystal growth histories. Crystal zoning patterns do not vary systematically between stratigraphic units, and multiple patterns are seen within the same sample over very short length scales. Intracrystalline elemental variations reveal mineral-melt interactions, which result in repeated resorption and recrystallisation in varied environments. Variable degrees of undercooling are evidenced by clinopyroxenes, with most crystals displaying sector zoning (ΔT < 50 K), while others only show concentric zoning, which suggests very low ΔT. The common occurrence of resorbed cores within the crystals and the prevalence of glomerocrysts indicate antecrystic and/or xenocrystic origins and crystal aggregation processes. We hypothesise that the repeated intrusion of melts into the crustal basement of Taranaki volcano has resulted in the formation of a heterogeneous subsolidus plutonic to supersolidus mushy (∼15–55 vol% crystals) system that interacts with intruding melts from the mantle. These interactions result in disaggregation of crystal clots from the plutonic intrusives and remobilization of the crystals through various sub-environments of small ephemeral mush pockets. Eruption-triggering injections of melt then pick up these crystals with varied growth histories to be extruded
dc.description.confidentialfalse
dc.edition.editionNovember 2024
dc.identifier.citationD'Mello NG, Zellmer GF, Ubide T, Caulfield J, Usuki M, Iizuka Y, Kereszturi G, Procter JN, Stewart RB. (2024). Exploring intrusive processes through the crystal cargo of volcanic rocks: The case of lava flows from Taranaki volcano, New Zealand. Chemical Geology. 667.
dc.identifier.doi10.1016/j.chemgeo.2024.122333
dc.identifier.eissn1872-6836
dc.identifier.elements-typejournal-article
dc.identifier.issn0009-2541
dc.identifier.number122333
dc.identifier.piiS0009254124004133
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/71789
dc.languageEnglish
dc.publisherElsevier B V
dc.publisher.urihttps://www.sciencedirect.com/science/article/pii/S0009254124004133
dc.relation.isPartOfChemical Geology
dc.rights(c) The author/sen
dc.rights.licenseCC BYen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectPlutonic basement Mush pockets Antecrysts Xenocrysts Remobilisation
dc.subjectPlutonic basement
dc.subjectMush pockets
dc.subjectAntecrysts
dc.subjectXenocrysts
dc.subjectRemobilisation
dc.titleExploring intrusive processes through the crystal cargo of volcanic rocks: The case of lava flows from Taranaki volcano, New Zealand
dc.typeJournal article
pubs.elements-id491190
pubs.organisational-groupOther
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