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PRODID:-//University of Otago//Events Calendar//EN
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UID:https://www.otago.ac.nz/geology/news/events/olivine-cao-as-proxy-to-mantle-wedge-depletion-in-the-trans-mexican-volcanic-belt
URL:https://www.otago.ac.nz/geology/news/events/olivine-cao-as-proxy-to-mantle-wedge-depletion-in-the-trans-mexican-volcanic-belt
DTSTART;TZID=Pacific/Auckland:20230301T130000
DTEND;TZID=Pacific/Auckland:20230301T140000
SUMMARY:Olivine CaO as proxy to mantle wedge depletion in the trans-Mexican volcanic belt
DESCRIPTION:
A seminar by presented by Susanne Straub (Lamont-Doherty Earth Observatory, Columbia University). 
Abstract
Cr-spinel bearing olivines are usually the first phases to crystallize in mafic arc magmas. We studied olivine+Cr-spinel in the high-Mg# basalts to andesites from a series of monogenetic and composite arc front volcanoes in the continental Trans-Mexican Volcanic Belt. In this talk, I will outline how isotope and major and trace element data of the olivine+Cr-spinels converge to suggest that the olivine+Cr-spinels capture compositional characteristics of the primary mantle melts, that in turn record a progressive depletion of in the background mantle (=mantle without slab component) caused by the subduction fluxing. 
Zoom
Zoom link for Susanne Straub's geology seminar 


LOCATION:Benson Common Room (Gn9, Geology Building), Dunedin campus and online via Zoom
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