Geophysical investigations of the Pensacola Mountains and adjacent glacierized areas of Antarctica

Behrendt, John C.; Henderson, John R.; Meister, Laurent; Rambo, William L.

doi:10.3133/pp844

Cited by 21 publications

(30 citation statements)

References 7 publications

(6 reference statements)

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“…Before the present study, the minimum area of the intrusion was estimated at 34,000 km2 based on gravity and magnetic surveys (3). It is of Jurassic age, horizontally stratified, probably 8 to 9 km thick (3), and dips to the east at a low angle. About 1.7 km of the upper part of the section crops out in the Forrestal Range, and 1.8 km of the lower section is exposed in the Dufek Massif.…”

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confidence: 92%

“…The Dufek intrusion has been under study since 1957 by U.S. geologists (2) and geophysicists (3)(4)(5), and a geological-geophysical team from the Soviet Union investigated the area in 1978 (6). The intrusion extends across the transition from West to East Antarctica along the Transantarctic Mountains, of which the Dufek Massif and Forrestal Range are a part (Fig.…”

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confidence: 99%

“…About 1.7 km of the upper part of the section crops out in the Forrestal Range, and 1.8 km of the lower section is exposed in the Dufek Massif. About 2 to 3 km of unexposed section is inferred (2,3) to lie beneath the ice between the ranges, with a second section of 2 to 3 km (3) probably lying hidden beneath the lowest exposed rock layer of the Dufek Massif. The stratigraphy of the Dufek intrusion shows a differentiation trend similar to that of other major layered intrusions.…”

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confidence: 99%

“…Behrendt et al (3) suggested that the Dufek intrusion was related to the rifting of Africa and Antarctica. Ford and Kistler (9) interpreted the Ferrar Group and the Dufek intrusion as evidence of a failed rift along the Transantarctic Mountains at the time of the initial rifting of Africa and Antarctica.…”

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confidence: 99%

“…Aeromagnetic measurements were used extensively in Antarctica in the late 1950's and 1960's (3,5), and long-range radio echo ice-soundings have been made since 1967 under a cooperative program between the U.S. Antarctica Research Program and the Scott Polar Research Institute (ll). However, results of studies in which the two methods were used in combination have not been reported.…”

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Aeromagnetic and Radio Echo Ice-Sounding Measurements Show Much Greater Area of the Dufek Intrusion, Antarctica

Behrendt

Drewry

Jankowski

et al. 1980

Science

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A combined aeromagnetic and radio echo ice-sounding survey made in 1978 in Antarctica over the Dufek layered mafic intrusion suggests a minimum area of the intrusion of about 50,000 square kilometers, making it comparable in size with the Bushveld Complex of Africa. Comparisons of the magnetic and subglacial topographic profiles illustrate the usefulness of this combination of methods in studying bedrock geology beneath ice-covered areas. Magnetic anomalies range in peak-to-through amplitude from about 50 nanoteslas over the lowermost exposed portion of the section in the Dufek Massif to about 3600 nanoteslas over the uppermost part of the section in the Forrestal Range. Theoretical magnetic anomalies, computed from a model based on the subice topography fitted to the highest amplitude observed magnetic anomalies, required normal and reversed magnetizations ranging from 10(-3) to 10(-2) electromagnetic units per cubic centimeter. This result is interpreted as indicating that the Dufek intrusion cooled through the Curie isotherm during one or more reversals of the earth's magnetic field.

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confidence: 92%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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