Rifted(?) crust at the East Antarctic Craton margin: gravity and magnetic interpretation along a traverse across the Wilkes Subglacial Basin region

Ferraccioli, Fausto; Coren, F.; Bozzo, E.; Zanolla, C.; Gandolfi, Stefano; Tabacco, Ignazio; Frezzotti, Màssimo

doi:10.1016/s0012-821x(01)00459-9

Cited by 75 publications

(65 citation statements)

References 18 publications

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“…[35] The Adventure Trench is distinguished by both a deep bedrock trough of likely tectonic origin [Ferraccioli et al, 2001;Studinger et al, 2004b] and a minor ice divide immediately to the east. The few surveys in this area before the UTIG campaign were generally flown perpendicular to the long axis of this feature and most likely missed the full extent of the lake beneath (Figure 9b).…”

Section: Adventure Trench and Surrounding Highlandsmentioning

confidence: 99%

Radar‐based subglacial lake classification in Antarctica

Carter

Blankenship

Peters

et al. 2007

Geochem Geophys Geosyst

139

237

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[1] Subglacial lakes in East Antarctica can be separated into four categories specified by radar reflection properties. Definite lakes are brighter than their surroundings by at least 2 dB (relatively bright) and both are consistently reflective (specular) and have a reflection coefficient greater than À10 dB (absolutely bright). Dim lakes are relatively bright and specular but not absolutely bright, indicating nonsteady ice dynamics. Fuzzy lakes are both relatively and absolutely bright, but not specular, and may indicate saturated sediments or ''swamps.'' Indistinct lakes are absolutely bright and specular but no brighter than their surroundings. Lakes themselves and the different classes of lakes are not arranged randomly throughout Antarctica but are clustered around ice divides, ice stream onsets, and prominent bedrock troughs, with each cluster demonstrating a different characteristic lake classification distribution. The lake classification algorithm expands on previous studies and demonstrates a novel way to characterize icewater interactions in East Antarctica.

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Section: Adventure Trench and Surrounding Highlandsmentioning

confidence: 99%

Radar‐based subglacial lake classification in Antarctica

Carter

Blankenship

Peters

et al. 2007

Geochem Geophys Geosyst

139

237

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“…F5, F6) (Drewry, 1983;Ferraccioli et al, 2001Ferraccioli et al, , 2007. The base of the portion of the EAIS draining through the Wilkes subglacial basin is largely below sea level, suggesting that this portion of the EAIS is potentially less stable than the rest of the EAIS.…”

Section: Introductionmentioning

confidence: 99%

Cenozoic East Antarctic Ice Sheet Evolution from Wilkes Land Margin Sediments

Escutia¹,

Brinkhuis²,

Klaus³

2008

IODP Scientific Prospectus

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“…For crustal rocks, samples or seismic studies show a mean density of 2400 kg/m 3 for sediments and 2900 kg/m 3 for basalts, gneiss, etc. (see [6,11,23]). Since the Antarctic crust is mainly composed of basement rocks, our choice of 2800 kg/m 3 is realistic and in agreement with the seismology [24].…”

Section: E¡ect Of Density Variationsmentioning

confidence: 99%

Crustal thickness in Antarctica from CHAMP gravimetry

Llubes

Florsch²,

Legrésy

et al. 2003

Earth and Planetary Science Letters

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CHAMP, flying at an altitude of about 400 km, is the first of a new generation of satellites dedicated to Earth gravity field observation. The high-quality data have generated new gravity field models: EIGEN-1S in 2001, and EIGEN-2S more recently. The gravitational potential is decomposed into spherical harmonic coefficients and in this study we use the free air gravity anomalies reconstituted up to degree 60, at zero altitude. The anomalies for the Antarctic continent range from 357 to 65 mGal. We have modeled the gravity effect from the ice, the ocean and the bedrock, using a 666 km cut-off filter to simulate the resolution obtained by CHAMP. Computing the differences between this terrain effect and the CHAMP map provides a map of the Bouguer anomalies. Because of the dominant influence of the crust, we first used a crustal thickness model from seismology. This gives a map of the mantle Bouguer anomalies, the range of which is still large (between 3255 and 216 mGal) indicating imperfections in the crust model. By appealing to isostasy we then imposed the condition that this mantle Bouguer anomaly should vanish and therefore solve for a new resulting crustal thickness. This gravity-based crust model gives thicknesses from 8.5 to 42.6 km in the zone of interest. There is a good general agreement with seismological models, but our models shows more detail, particularly in the western part of the continent. These details are in agreement with geological studies. ß

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Rifted(?) crust at the East Antarctic Craton margin: gravity and magnetic interpretation along a traverse across the Wilkes Subglacial Basin region

Cited by 75 publications

References 18 publications

Radar‐based subglacial lake classification in Antarctica

Radar‐based subglacial lake classification in Antarctica

Cenozoic East Antarctic Ice Sheet Evolution from Wilkes Land Margin Sediments

Crustal thickness in Antarctica from CHAMP gravimetry

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