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Adjoint inversion of the thermal structure of Southeastern Australia

Mather, B.; Moresi, Louis; Rayner, P.

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The variation of temperature in the crust is difficult to quantify due to the sparsity of surface heat flow observations and lack of measurements on the thermal properties of rocks at depth. We examine the degree to which the thermal structure of the crust can be constrained from the Curie depth and surface heat flow data in Southeastern Australia. We cast the inverse problem of heat conduction within a Bayesian framework and derive its adjoint so that we can efficiently find the optimal model...[Show more]

dc.contributor.authorMather, B.
dc.contributor.authorMoresi, Louis
dc.contributor.authorRayner, P.
dc.date.accessioned2020-03-25T04:49:18Z
dc.date.available2020-03-25T04:49:18Z
dc.identifier.issn0956-540X
dc.identifier.urihttp://hdl.handle.net/1885/202462
dc.description.abstractThe variation of temperature in the crust is difficult to quantify due to the sparsity of surface heat flow observations and lack of measurements on the thermal properties of rocks at depth. We examine the degree to which the thermal structure of the crust can be constrained from the Curie depth and surface heat flow data in Southeastern Australia. We cast the inverse problem of heat conduction within a Bayesian framework and derive its adjoint so that we can efficiently find the optimal model that best reproduces the data and prior information on the thermal properties of the crust. Efficiency gains obtained from the adjoint method facilitate a detailed exploration of thermal structure in SE Australia, where we predict high temperatures within Precambrian rocks of 650 °C due to relatively high rates of heat production (0.9–1.4 μW m−3). In contrast, temperatures within dominantly Phanerozoic crust reach only 520 °C at the Moho due to the low rates of heat production in Cambrian mafic volcanics. A combination of the Curie depth and heat flow data is required to constrain the uncertainty of lower crustal temperatures to ±73 °C. We also show that parts of the crust are unconstrained if either data set is omitted from the inversion.
dc.description.sponsorshipThis work was supported by resources provided by the Pawsey Supercomputing Centre with funding from the Australian Government and the Government of Western Australia.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherOxford University Press
dc.rights© The Author(s) 2019. Published by Oxford University Press on behalf of The Royal Astronomical Society.
dc.sourceGeophysical Journal International
dc.titleAdjoint inversion of the thermal structure of Southeastern Australia
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume219
dc.date.issued2019
local.identifier.absfor040402 - Geodynamics
local.identifier.absfor040404 - Geothermics and Radiometrics
local.identifier.ariespublicationu3102795xPUB5228
local.publisher.urlhttps://academic.oup.com/journals/
local.type.statusPublished Version
local.contributor.affiliationMather, B., The University of Sydney
local.contributor.affiliationMoresi, Louis, College of Science, ANU
local.contributor.affiliationRayner, P., The University of Melbourne
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage1648
local.bibliographicCitation.lastpage1659
local.identifier.doi10.1093/gji/ggz368
local.identifier.absseo850502 - Geothermal Energy
dc.date.updated2019-11-25T07:44:36Z
local.identifier.scopusID2-s2.0-85072771055
dcterms.accessRightsOpen Access
dc.provenancehttp://sherpa.ac.uk/romeo/issn/0956-540X/..."author can archive publisher's version/PDF" from Sherpa/Romeo (as at 25 March 2020)
CollectionsANU Research Publications

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