Key Points First heat flow measurements from the Coompana Province, southern Australia, indicate values of 40–70 mW/m2 (57 ± 3 mW/m2 average) A tectonically reconstructed heat flow map constrains the thermal regime of geological provinces formerly contiguous with East Antarctica Geophysical models of Antarctic heat flow are likely underestimating crustal sources of radiogenic heat that influence subglacial melting

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