MushPEC: Correcting Post-entrapment Processes Affecting Melt Inclusions Hosted in Olivine Antecrysts

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dc.citation.issue2020
dc.citation.volume8
dc.contributor.authorBrahm R
dc.contributor.authorZellmer GF
dc.contributor.authorKuritani T
dc.contributor.authorCoulthard Jr. D
dc.contributor.authorNakagawa M
dc.contributor.authorSakamoto N
dc.contributor.authorYurimoto H
dc.contributor.authorSato E
dc.contributor.editorPetrone CM
dc.date.accessioned2024-08-14T02:05:26Z
dc.date.available2024-08-14T02:05:26Z
dc.date.issued2021-01-29
dc.description.abstractOlivine-hosted melt inclusions (MIs) are widely used as a tool to study the early stages of magmatic evolution. There are a series of processes that affect MI compositions after trapping, including post-entrapment crystallization (PEC) of the host mineral at the MI boundaries, exsolution of volatile phases into a “shrinkage bubble” and diffusive exchange between a MI and its host. Classical correction schemes applied to olivine-hosted MIs include PEC correction through addition of olivine back to the melt until it reaches equilibrium with the host composition and “Fe-loss” correction due to Fe-Mg diffusive exchange. These corrections rely on the assumption that the original host composition is preserved. However, for many volcanic samples the crystal cargo is thought to be antecrystic, and the olivine composition may thus have been completely re-equilibrated during long crystal storage times. Here, we develop a novel MI correction scheme that is applicable when the original host crystal composition has not been preserved and the initial MI composition variability can be represented by simple fractional crystallization (FC). The new scheme allows correction of MI compositions in antecrystic hosts with long and varied temperature histories. The correction fits a set of MI compositions to modelled liquid lines of descent generated by FC. A MATLAB® script (called MushPEC) iterates FC simulations using the rhyolite-MELTS algorithm. In addition to obtaining the corrected MI compositions, the application of this methodology provides estimations of magmatic conditions during MI entrapment. A set of MIs hosted in olivine crystals of homogeneous composition (Fo77–78) from a basaltic tephra of Akita-Komagatake volcano was used to test the methodology. The tephra sample shows evidence of re-equilibration of the MIs to a narrow Mg# range equivalent to the carrier melt composition. The correction shows that olivine hosts were stored in the upper crust (c. 125 – 150 MPa) at undersaturated H2O contents of c. 1 – 2 wt% H2O)
dc.description.confidentialfalse
dc.identifier.author-urlhttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000617053400001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=c5bb3b2499afac691c2e3c1a83ef6fef
dc.identifier.citationBrahm R, Zellmer GF, Kuritani T, Coulthard D, Nakagawa M, Sakamoto N, Yurimoto H, Sato E. (2021). MushPEC: Correcting Post-entrapment Processes Affecting Melt Inclusions Hosted in Olivine Antecrysts. Frontiers in Earth Science. 8. 2020.
dc.identifier.doi10.3389/feart.2020.599726
dc.identifier.eissn2296-6463
dc.identifier.elements-typejournal-article
dc.identifier.numberARTN 599726
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/71287
dc.languageEnglish
dc.publisherFrontiers Media S A, Switzerland
dc.publisher.urihttps://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2020.599726/full
dc.relation.isPartOfFrontiers in Earth Science
dc.rights(c) 2021 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectpost-entrapment crystallization
dc.subjectFe-Mg diffusion
dc.subjectmelt inclusion correction
dc.subjectantecryst equilibration
dc.subjectMELTS modelling
dc.subjectcompositional data analysis
dc.subjectaitchison distance minimization
dc.subjectakita-komagatake
dc.titleMushPEC: Correcting Post-entrapment Processes Affecting Melt Inclusions Hosted in Olivine Antecrysts
dc.typeJournal article
pubs.elements-id438859
pubs.organisational-groupOther
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