Crustal heat production and estimate of terrestrial heat flow in central East Antarctica, with implications for thermal input to the East Antarctic ice sheet

Goodge, John W.

doi:10.5194/tc-12-491-2018

Cited by 27 publications

(40 citation statements)

References 54 publications

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“…These suggestions are consistent with more detailed regional studies, where those exist (e.g., Aitken et al, 2014;Jacobs et al, 2015;Ruppel et al, 2018). A complex interior also agrees with recent geological studies that find large age variations in marine cores (Cook et al, 2017), glacial deposits in the Transantarctic Mountains (Goodge, 2018), and what might be expected from other Gondwana continents (e.g., Begg et al, 2009;Korsch & Doublier, 2016;Kennett et al, 2018).…”

Section: New Insights Into the Lithosphere Of Antarcticasupporting

confidence: 89%

A Multivariate Approach for Mapping Lithospheric Domain Boundaries in East Antarctica

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Halpin

et al. 2019

Geophysical Research Letters

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Beneath the ice of East Antarctica lies a continent that is likely to be as geologically complex as its neighbors in Gondwana. An improved model of the heterogeneous lithosphere is required to progress research on Antarctica's tectonic evolution and support interdisciplinary studies of cryosphere and solid Earth interaction. We make use of multiple data sets, which were updated following the field campaigns and compilations of the International Polar Year of 2007/2008. Seismic tomography results, gravity anomalies, and surface elevation are used in a novel method, which combines spatial multivariate data to map possible boundaries as projected likelihood functions. Six multivariate combinations are tested and compared with sparse geological observations in East Antarctica. The resulting lithospheric domain boundaries contribute to our understanding of the deep continental structure. New boundaries are suggested in the interior, and models agree with likely surface expressions of crustal tectonic boundaries exposed along the coast.

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Section: New Insights Into the Lithosphere Of Antarcticasupporting

confidence: 89%

A Multivariate Approach for Mapping Lithospheric Domain Boundaries in East Antarctica

Stål

Reading

Halpin

et al. 2019

Geophysical Research Letters

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“…The averaged shear wave velocity within the NELVZ (from ~10‐ to 25‐km depth) is consistent with shear wave velocities for granite‐gneiss to granite‐granodiorite rock types in this depth range (Christensen, ; Table ). This hypothesis provides a common source for the gravity low observed in both NE Greenland and NN and could explain regional measurements of elevated heat flow if we consider the relative thickness of this granitic layer (Pascal et al, ) and the presence of high heat‐producing granitoid rocks in NE Greenland as found in other Proterozoic terranes (Carson et al, ; Goodge, ; McLaren et al, ).…”

Section: Resultsmentioning

confidence: 92%

Lithospheric Structure of Greenland From Ambient Noise and Earthquake Surface Wave Tomography

Pourpoint¹,

Anandakrishnan

Ammon

et al. 2018

JGR Solid Earth

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We present a high‐resolution shear wave velocity model of Greenland's lithosphere from regional and teleseismic Rayleigh waves recorded by the Greenland Ice Sheet Monitoring Network supplemented with observations from several temporary seismic deployments. To construct Rayleigh wave group velocity maps, we integrated signals from regional and teleseismic earthquakes with several years of ambient seismic noise and used the dispersion to constrain crustal and upper‐mantle seismic shear wave velocity structure. Specifically, we used a Markov Chain Monte Carlo technique to estimate 3‐D shear wave velocities beneath Greenland to a depth of 200 km. Our model reveals four prominent anomalies: a deep high‐velocity feature extending from southwestern to northwestern Greenland that may be the signature of a thick cratonic keel, a corridor of relatively low upper‐mantle velocity across central Greenland that could be associated with lithospheric modification from the passage of the Iceland plume beneath Greenland or interpreted as a tectonic boundary between cratonic blocks, an upper‐crustal southwest‐northeast trending boundary separating Greenland into two regions of contrasting tectonic and crustal properties, and a midcrustal low‐velocity anomaly beneath northeastern Greenland. The nature of this midcrustal anomaly is of particular interest given that it underlies the onset of the Northeast Greenland Ice Stream and raises interesting questions regarding how deeper processes may impact the ice stream dynamics and the evolution of the Greenland Ice Sheet.

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“…It is also difficult to determine where the thermal regime is conductive versus advective, which may be of critical importance to local conditions at the base of the ice sheet. The most significant improvement for future models of Antarctic heat flow derived from geophysical data is a more representative model of the three‐dimensional crustal architecture and resultant variations of heat production within the crust (Goodge, ).…”

Section: Discussionmentioning

confidence: 99%

“…The conventional measurement of heat flow requires access to drill holes that have recovered core samples of bedrock and direct measurement of the thermal gradient downhole (Beardsmore & Cull, ). While a small number of drill holes exist in Antarctica, they are extremely sparse in their distribution (Martos et al, ) and all measure thermal parameters only within ice or subglacial sediment; none yet have intersected the bedrock beneath (Goodge, ). Some measurements exist from offshore localities that sample sediment derived from the continental margin (Decker & Bucher, ; Dziadek et al, ; Morin et al, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

Heat Flow in Southern Australia and Connections With East Antarctica

Pollett

Hasterok

Raimondo

et al. 2019

Geochem Geophys Geosyst

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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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Crustal heat production and estimate of terrestrial heat flow in central East Antarctica, with implications for thermal input to the East Antarctic ice sheet

Abstract: Abstract. Terrestrial heat flow is a critical first-order factor governing the thermal condition and,

Cited by 27 publications

References 54 publications

A Multivariate Approach for Mapping Lithospheric Domain Boundaries in East Antarctica

A Multivariate Approach for Mapping Lithospheric Domain Boundaries in East Antarctica

Lithospheric Structure of Greenland From Ambient Noise and Earthquake Surface Wave Tomography

Heat Flow in Southern Australia and Connections With East Antarctica

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