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Contributions to Antarctic Research IV

Contributions to Antarctic Research IV

David H. Elliot (Editor), George L. Blaisdell (Editor)

ISBN: 978-1-118-66820-7

Mar 2013, American Geophysical Union

216 pages

Select type: O-Book

Description

Published by the American Geophysical Union as part of the Antarctic Research Series, Volume 67.

A high amplitude magnetic anomaly occurs over the Butcher Ridge igneous complex in the Transantarctic Mountains. This sill-like body is approximately 10 km long where exposed. It ranges from basalt to rhyolite in composition and has been suggested as evidence of a large mafic intrusion at depth. A single NW-SE aeromagnetic profile flown across Butcher Ridge gave an 8-km-wide positive anomaly with maxima of about 700 and 1000 nT which are associated with topographic peaks that the aircraft cleared at about 300 and 600 m respectively. The observed amplitude of the Butcher Ridge anomaly is too great to be caused by a typical sill of Ferrar Dolerite, examples of which are widely exposed along the Transantarctic Mountains. Models that fit the observed data indicate magnetizations comparable to the Jurassic Dufek layered mafic intrusion in the Transantarctic Mountains near the Weddell Sea. Model calculations show that the upper, and most magnetic part of the inferred intrusion must be greater than about 2 km thick and that the entire intrusion is probably substantially thicker. We interpret the source of the Butcher Ridge magnetic anomaly to be a layered mafic intrusion, syntectonic with the Jurassic Transantarctic (failed) rift, marked by the Ferrar Dolerite. The magnetic evidence for a buried mafic body beneath the Butcher Ridge igneous complex is the first evidence of possible Jurassic cumulate rocks in the Transantarctic Mountains bordering the Ross Embayment-Byrd Subglacial Basin.

The Antarctic Research Series: Statement of Objectives
Board of Associate Editors  VIII

High Amplitude Aeromagnetic Anomaly Over the Butcher Ridge Igneous Complex' Evidence of Possible Jurassic Cumulate Rocks in the Transantarctic Mountains Bordering the Ross Embayment
John C. Behrendt, Anne E. McCafferty, Detlef Damaske, and Philip R. Kyle  1

Geomagnetic Activity and Its Implications for the 1991-1992 CASERTZ Aeromagnetic Survey in Antarctica
R. W. Saltus and R. P. Kucks  9

Geological Exploration of East Antarctica: Iron, Manganese, and Titanium in the Heavy-Mineral Fractions of Till in the Transantarctic Mountains
Gunter Faure, Erik H. Hagen, Kenneth S. Johnson, Michael L. Strobel, and Kent S. Whiting 19

An Ice-Core-Based, Late Holocene History for the Transantarctic Mountains, Antarctica
P. A. Mayewski, W. B. Lyons, G. Zielinski, M. Twickler, S. Whitlow, J. Dibb, P. Grootes, K. Taylor, P.-Y. Whung, L. Fosberry, C. Wake, and K. Welch 33

A Thermal, Isotopic, and Chemical Study of Lake Vanda and Don Juan Pond, Antarctica
Irving Friedman, Athol Rafter, and George I. Smith 47

Intrusive Igneous Rocks of Eastern Ellsworth Land, West Antarctica: The Southwestward Extension of the Lassitter Coast Intrusive Suite
W. R. Vennum, P. D. Rowley, and T. S. Laudon 75

Petrology and Mineralogy of the Kirkpatrick Basalt and Ferrar Dolerite, Mesa Range Region, North Victoria Land, Antarctica
D. H. Elliot, T. H. Fleming, M. A. Haban, and M. A. Siders 103

Antarctic Airfields
Malcolm Mellor 143

Compacted Snow Runway Technology on the Ross Ice Shelf Near McMurdo, Antarctica
George L. Blaisdell, Valeri Klokov, and Deborah Diemand 153

Glaciology of the McMurdo Ice Shelf in the Area of Air Operations
Valeri Klokov and Deborah Diemand 175

Delivery of Fuel and Construction Materials to Amundsen-Scott South Pole Station
Stephen L. DenHartog and George L. Blaisdell  197