Early East Antarctic Ice Sheet growth recorded in the landscape of the Gamburtsev Subglacial Mountains

Rose, Kathryn C.; Ferraccioli, Fausto; Jamieson, Stewart S. R.; Bell, Robin E.; Corr, Hugh; Creyts, T. T.; Braaten, D.; Jordan, Tom A.; Fretwell, Peter T.; Damaske, Detlef

doi:10.1016/j.epsl.2013.03.053

Cited by 92 publications

(115 citation statements)

References 89 publications

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“…As shown in Fig. 2, the glacially eroded igneous clasts discussed here may also sample the Gamburtsev Subglacial Mountains, which is thought to have nucleated growth of the East Antarctic Ice Sheet (DeConto and Pollard, 2003;Bo et al, 2009;Rose et al, 2013).…”

Section: Glacial Igneous Clastsmentioning

confidence: 85%

“…Although much of the area underlying the Rauer Islands and Vestfold Hills has low heat flow (< 50 mW m −2 ) typical of Proterozoic and Archean crust, Carson et al (2014) emphasized that some early Paleozoic granites with anomalously high heat production can cause local elevation of heat flow (> 80 mW m −2 ), as observed in the Central Australian Heat Flow Province (CAHFP; McLaren et al, 2003). Thus, spatially coarse models of heat flow based on geophysical data across East Antarctica indicate relatively typical continental values ranging from about 35 to 60 mW m −2 , yet there are (Fretwell et al, 2013). Principal features are ice-sheet catchment areas (marked by thin blue drainage divides), ice flow directions in the broad Byrd Glacier drainage (arrows; Rignot et al, 2011), and areas of Precambrian basement exposure (pink).…”

Section: Introductionmentioning

confidence: 99%

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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

Goodge¹

2018

The Cryosphere

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Section: Glacial Igneous Clastsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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

Goodge¹

2018

The Cryosphere

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“…For simplicity we assume the ice load is the same in both scenarios. Bed and ice surface topography after Fretwell et al, 2013). …”

Section: Resultsmentioning

confidence: 99%

“…2). The bounding Slessor Glacier to the north is 50 km wide and in places the bed is 2000 m below sea level (Fretwell et al 2013). Recovery Glacier to the south is 70 km in width and in the vicinity of the western Shackleton Range, the trough is ~ 2000 m below sea level.…”

Section: The Shackleton Rangementioning

confidence: 98%

“…All these features are typical of the erosion of a passive continental margin with mountain blocks eroded by fluvial processes and escarpments invigorated by a new base level as a result of rifting (Beaumont et al, 2000;Jamieson and Sugden, 2008). There are likely to have been river valleys originating in interior mountains and flowing to the coast between mountain blocks (Bo et al, 2000;Rose et al, 2013;Webb, 1994). In the Shackleton block the pattern of escarpments parallel to or linked to tributaries some tens of km inland suggests slope retreat from a river system which is graded to sea level, at least in its lower reaches.…”

Section: The Shackleton Rangementioning

confidence: 99%

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Emergence of the Shackleton Range from beneath the Antarctic Ice Sheet due to glacial erosion

Sugden¹,

Fogwill

Hein³

et al. 2014

Geomorphology

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This paper explores the long-term evolution of a subglacial fjord landscape in the Shackleton Range, Antarctica. We propose that prolonged ice-sheet erosion across a passive continental margin caused troughs to deepen and lower the surrounding icesheet surface, leaving adjacent mountains exposed. Geomorphological evidence suggests a change in the direction of regional ice flow accompanied emergence. Simple calculations suggest that isostatic compensation caused by the deepening of bounding ice-stream troughs lowered the ice-sheet surface relative to the mountains by ~ 800 m. Use of multiple cosmogenic isotopes on bedrock and erratics ( 26 Al, 10 Be, 21 Ne) provides evidence that overriding of the massif and the deepening of the adjacent troughs occurred earlier than the Quaternary. Perhaps this occurred in the mid-Miocene, as elsewhere in East Antarctica in the McMurdo Dry Valleys and the Lambert basin. The implication is that glacial erosion instigates feedback which can change ice-sheet thickness, extent and direction of flow. Indeed, as the sub-glacial troughs evolve over millions of years, they increase topographic relief and this changes the dynamics of the ice sheet.

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Freezing of ridges and water networks preserves the Gamburtsev Subglacial Mountains for millions of years

Creyts

Ferraccioli

Bell

et al. 2014

Geophysical Research Letters

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Once an ice sheet grows beyond a critical thickness, the basal thermal regime favors melting and development of subglacial water networks. Subglacial water is necessary for bedrock erosion, but the exact mechanisms that lead to preservation of subglacial topography are unclear. Here we resolve the freezing mechanisms that lead to long‐term, high‐altitude preservation across the Gamburtsev Subglacial Mountains in East Antarctica. Analyses of a comprehensive geophysical data set reveal a large‐scale water network along valley floors. The ice sheet often drives subglacial water up steep topography where it freezes along high ridges beneath thinner ice. Statistical tests of hypsometry show the Gamburtsevs resemble younger midlatitude mountains, indicating exceptional preservation. We conclude that the Gamburtsevs have been shielded from erosion since the latest Eocene (∼34 Ma). These freezing mechanisms likely account for the spatial and temporal patterns of erosion and preservation seen in other glaciated mountain ranges.

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Early East Antarctic Ice Sheet growth recorded in the landscape of the Gamburtsev Subglacial Mountains

Cited by 92 publications

References 89 publications

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

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

Emergence of the Shackleton Range from beneath the Antarctic Ice Sheet due to glacial erosion

Freezing of ridges and water networks preserves the Gamburtsev Subglacial Mountains for millions of years

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