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Open-File Report 2006-1255

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### In cooperation with National Science Foundation, Bundesanstalt für Geowissenschaften und Rohstoffe, and University of Minnesota, Duluth

## Aeromagnetic and Gravity Data Over the Central Transantarctic Mountains (CTAM), Antarctica: A Website for the Distribution of Data and Maps

#### By E. D. Anderson, C. A. Finn, D. Damaske, J. D. Abraham, F. Goldmann, J. W. Goodge, P. Braddock

| *Open-File Report*PDF (913 KB)                    Right-Click to 'Save As' or 'Download'*Open-File Report*PDF (913 KB)                  Right-Click to 'Save As' or 'Download'**Abstract**
Near complete coverage of the East Antarctic Shield by ice hampers geological study of crustal architecture important for understanding global tectonic and climate history. Limited exposures in the central Transantarctic Mountains (CTAM), however, show that Archean and Proterozoic rocks of the shield as well as Neoproterozoic-lower Paleozoic sedimentary successions were involved in oblique convergence associated with Gondwana amalgamation. Subsequently, the area was overprinted by Jurassic magmatism and Cenozoic uplift. To extend the known geology of the region to ice-covered areas, we conducted an aeromagnetic survey flown in draped mode by helicopters over the Central Transantarctic Mountains and by fixed-wing aircraft over the adjacent polar plateau. We flew more than 32,000 line km covering an area of nearly 60,000 km2 at an average altitude of 600 m, with average line spacing 2.5 km over most areas and 1.25 km over basement rocks exposed in the Miller and Geologists ranges. Additional lines flown to the north, south, and west extended preliminary coverage and tied with existing surveys. Gravity data was collected on the ground along a central transect of the helicopter survey area. | Version 1.0

Posted September 2006
-  **Report** PDF (913 KB)  (This report meets accessibility standards defined by Section 508.) 
-  **Magnetic Data** Directory  Refer to the Magnetic README file for more information about the dataset in this directory. 
-  **Gravity Data** Directory  Refer to the Gravity README file for more information about the dataset in this directory. |
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| U.S. Department of the Interior | U.S. Geological Survey      URL: https://pubsdata.usgs.gov/pubs/of/2006/1255/Questions or Assistance: USGS Web ContactPage Last Modified: Sat Jan 12 22:04 EDT 2013 |  |

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