Halpin, J and Burton-Johnson, A and Watson, S and Whittaker, J and Staal, T and Reading, A and Maritati, A, Warm, warmer, hot! Antarctic crustal radiogenic heat production, TACtical Workshop Abstracts, 21-23 March 2018, Hobart, Tasmania (2018) [Conference Extract]
Official URL: https://www.conferences.com.au/2018-taking-the-tem...
Current GHF models of the Antarctic continent based on geophysical properties use idealised crustal parameters that do not reflect the inherent geological heterogeneity. For example, recent studies have shown that radiogenic heat production values for Antarctic granites and gneisses can be significantly enriched (>10-15, and up to 65 micro watts per metre cubed) compared to average crustal values that are used across the entire continent in existing Antarctic GHF models (∼1-2 micro watts per metre cubed). Regional ice sheet models have shown that localised regions of such high HPE-enriched crust can impact the organisation of ice flow, particularly in slow-flowing regions, underscoring the need for improved knowledge of both the magnitude and spatial variability of radiogenic heat production in Antarctic crust.
Here we assess the range in heat production values from diverse lithologies across outcrops and moraines in Antarctica using a compilation of previously published and new geochemical analyses. We explore variations with lithology, age and between geological terranes. Our analysis demonstrates significant spatial variability in heat production that will need to be integrated with deeper lithospheric structure and heat flow constraints to improve GHF models of the Antarctic continent.
|Item Type:||Conference Extract|
|Keywords:||Antarctica, crustal radiogenic heat production|
|Research Division:||Earth Sciences|
|Research Field:||Inorganic Geochemistry|
|Objective Division:||Expanding Knowledge|
|Objective Group:||Expanding Knowledge|
|Objective Field:||Expanding Knowledge in the Earth Sciences|
|UTAS Author:||Halpin, J (Dr Jacqueline Halpin)|
|UTAS Author:||Watson, S (Ms Sally Watson)|
|UTAS Author:||Whittaker, J (Associate Professor Jo Whittaker)|
|UTAS Author:||Staal, T (Mr Tobias Staal)|
|UTAS Author:||Reading, A (Professor Anya Reading)|
|UTAS Author:||Maritati, A (Mr Alessandro Maritati)|
|Deposited By:||Oceans and Cryosphere|
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