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dc.contributor.authorSchwindinger, Martin
dc.contributor.authorWeinberg, Roberto
dc.contributor.authorWhite, Richard William
dc.identifier.citationSchwindinger , M , Weinberg , R & White , R W 2020 , ' The fate of accessory minerals and key trace elements during anatexis and magma extraction ' , Journal of Petrology , vol. 61 , no. 2 , egaa031 .
dc.identifier.otherPURE: 267128332
dc.identifier.otherPURE UUID: ff660402-49cd-49d3-89d6-df3b8c4089c3
dc.identifier.otherORCID: /0000-0002-5270-3985/work/71560041
dc.identifier.otherScopus: 85090031763
dc.identifier.otherWOS: 000593094800006
dc.descriptionThis work was financially supported by ARC grant DP110102543.en
dc.description.abstractGranite genesis and crustal evolution are closely associated with partial melting in the lower or middle crust and extraction of granite magmas to upper levels. This is generally thought to be the leading mechanism by which the upper continental crust became enriched in incompatible components such as the heat-producing elements U and Th through time. However, field evidence from anatectic terrains, the source rocks of granite magmas, raises doubt about the efficiency of this process. Leucosomes and associated leucogranites, representative of melts in such terrains, are often depleted in U, Th and REE compared to their source and therefore unable to enrich the upper crust in these elements. This paper demonstrates using anatectic turbidites exposed on Kangaroo Island that accessory minerals, the main host of U, Th and REE, become preferentially concentrated in the melanosomes, effectively removing these elements from the melt. Whole rock geochemistry and detailed petrography suggests that (a) peraluminous melts dissolve only small fractions of monazite and xenotime, because efficient apatite dissolution saturates melt early in phosphorous; and (b) local melt–host reaction emerging from melt migration may cause substantial melt to crystallize in the magma extraction channelways in or close to the magma source region. Crystallization causes oversaturation of the magma triggering the crystallization and capture of accessory minerals in the growing biotite-rich selvedge rather than in the melt channel itself. Crystallization of accessory minerals away from the leucosomes explains the apparent under-saturation of elements hosted by these accessory minerals in the leucosome. While intense reworking of thick piles of turbidites, common in accretionary orogens, reflect important processes of crustal formation, the fate of accessory phases and the key elements they control, such as the heat producing elements U and Th, is strongly dependent on the interaction between melt and surrounding solids during segregation and extraction.
dc.relation.ispartofJournal of Petrologyen
dc.rightsCopyright The Author(s) 2020. Published by Oxford University Press. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectAccessory mineralsen
dc.subjectGE Environmental Sciencesen
dc.titleThe fate of accessory minerals and key trace elements during anatexis and magma extractionen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Earth & Environmental Sciencesen
dc.description.statusPeer revieweden

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