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A multi-domain lithospheric model of East Antarctica


Staal, T and Reading, AM and Halpin, J and Whittaker, J, A multi-domain lithospheric model of East Antarctica, POLAR2018 Open Science Conference Abstract Proceedings, 19-23 June 2018, Davos, Switzerland, pp. 1938. (2018) [Conference Extract]

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The geology of East Antarctica is poorly constrained and covered by ice which can be several kilometers thick, however, these hidden and inaccessible rocks are of major interest in interdisciplinary studies linking the solid Earth and cryosphere. Subglacial geothermal heat flux is an important parameter for ice sheet models and depends on heat production within the crust, but also the deep geothermal gradient that is defined by the lithospheric structure.

Seismic tomography studies derive lithosphere thickness and structure, but the resolution is relatively low, and the smoothed models don't reflect the amalgamation of lithospheric terranes that formed the continent. We combine geophysical constraints from seismic properties and potential field data, with geological knowledge from the sparse Antarctic outcrops and from Gondwanan neighbours in a plate reconstruction framework. We use Bayesian inference to suggest the most probable boundaries by using a multivariate prior. The boundaries form a segmentation of the Antarctic lithosphere and can be weighted with probabilistic significance and location.

The result is presented as a first draft of a multi-domain tessellated terrane map of the East Antarctic lithosphere. We believe that this approach will be useful in estimating both basal lithosphere and crustal contributions to heat flux, and is a robust stepping stone towards more refined models.

Item Details

Item Type:Conference Extract
Keywords:Antarctica, lithosphere, Bayesian, heat flux
Research Division:Mathematical Sciences
Research Group:Statistics
Research Field:Probability theory
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Staal, T (Mr Tobias Staal)
UTAS Author:Reading, AM (Professor Anya Reading)
UTAS Author:Halpin, J (Dr Jacqueline Halpin)
UTAS Author:Whittaker, J (Associate Professor Jo Whittaker)
ID Code:131207
Year Published:2018
Deposited By:Oceans and Cryosphere
Deposited On:2019-03-06
Last Modified:2019-03-06

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