Conservation of deep crustal heat production

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dc.contributor.authorAlessio, K.
dc.contributor.authorHand, M.
dc.contributor.authorKelsey, D.
dc.contributor.authorWilliams, M.
dc.contributor.authorMorrissey, L.
dc.contributor.authorBarovich, K.
dc.date.issued2018
dc.description.abstractPartial melting of continental crust is generally considered to produce granitic rocks that have high radiogenic heat production rates when compared to their inferred sources and average continental crust. If this idea is correct, then granulite-facies rocks, which are the sources for crustally derived melt, and comprise the residual material left behind after melt loss, should have depleted heat production rates with respect to crustally derived granites. However, K–U–Th measurements from metapelitic compositions in five metamorphic terranes show that crustal heat production rates do not change significantly between subsolidus and formerly suprasolidus domains that have undergone fluid-absent partial melting and experienced significant (>20 vol%) melt loss. In some cases, crustal heat production rates increase in the residual granulite-facies rocks. This suggests fluid-absent partial melting does not deplete concentrations of heat-producing elements in residual metapelitic-derived granulite-facies rocks. Consequently, basement terranes may retain elevated concentrations of heat-producing elements and therefore be more susceptible to thermo-mechanical reactivation than typically expected.
dc.description.statementofresponsibilityKiara L. Alessio, Martin Hand, David E. Kelsey, Megan A. Williams, Laura J. Morrissey, and Karin Barovich
dc.identifier.citationGeology (Boulder), 2018; 46(4):335-338
dc.identifier.doi10.1130/G39970.1
dc.identifier.issn0091-7613
dc.identifier.issn1943-2682
dc.identifier.orcidHand, M. [0000-0003-3743-9706]
dc.identifier.orcidMorrissey, L. [0000-0001-7506-6117]
dc.identifier.urihttp://hdl.handle.net/2440/111732
dc.language.isoen
dc.publisherGeological Society of America
dc.relation.granthttp://purl.org/au-research/grants/arc/DP160101006
dc.relation.granthttp://purl.org/au-research/grants/arc/LP160100578
dc.relation.granthttp://purl.org/au-research/grants/arc/DP160104637
dc.rights© 2018 Geological Society of America. For permission to copy, contact editing@geosociety.org.
dc.source.urihttps://doi.org/10.1130/g39970.1
dc.titleConservation of deep crustal heat production
dc.typeJournal article
pubs.publication-statusPublished

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