Rift Mechanisms and Thermal Regime of the Lithosphere across Beardmore Glacier Region, Central Transantarctic Mountains, from Magnetotelluric Measurements
Entry ID: NSF-ANT08-38914

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Summary
Abstract: The investigators will examine competing hypotheses for the mechanism of extension and creation of the Transantarctic Mountains, and evolution of the thermal regimes of rifted West Antarctica and stable East Antarctica using magnetotelluric (MT) profiles. Surrounded almost entirely by ocean ridges, Antarctica is a special tectonic situation because of the need to make accommodation space for rifting in the Transantarctic region. In the MT method, temporal variations in the Earth's natural electromagnetic field are used as source fields to probe the electrical resistivity structure in the depth range of 1 to 200 km, or more. Geophysical methods, such as MT, are appropriate in Antarctica because of the predominance of thick ice cover over most of the Continent and the difficult operating environment. The proposed effort will consist of approximately 50 sites over a distance approaching 500 km with a 10 km average spacing, oriented normal to the Transantarctic Mountains (TAM), in the Beardmore glacier area. High quality MT soundings will be collected over thick ice sheets using a custom electrode preamp design, updated from previous Antarctic projects. Data acquisition will take place over two field seasons. The primary goals are three-fold: to establish the location of the deeper tectonic transition between East and West Antarctica that may be offset from the physiographic transition at the surface, using deep resistivity structure distinguish between modes of extensional upwelling and magmatism that may be vertically non-uniform, depth and magnitude of quasi-layered deep crustal low resistivity, particularly below West Antarctica, will be used to estimate crustal heat flux into the ice sheet base.

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Description: Original data submitted.


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Description: NSF Award Abstract #0838722


Geographic Coverage
 N: -82.13 S: -84.34835  E: 179.94691  W: 141.01732

Temporal Coverage
Start Date: 2009-09-01
Stop Date: 2012-08-31


Location Keywords
CONTINENT > ANTARCTICA
SOLID EARTH > CRUST
SOLID EARTH > MANTLE
GEOGRAPHIC REGION > POLAR


Science Keywords
SOLID EARTH >GEOMAGNETISM >MAGNETIC FIELD >GEOMAGNETIC INDUCTION    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION


Project
NSF/OPP >Office of Polar Programs, National Science Foundation    [Information]


Data Set Progress
COMPLETE


Data Center
Data Coordination Center, United States Antarctic Program    [Information]
Data Center URL: http://www.usap-data.org/
Dataset ID: NSF-ANT08-38914

Data Center Personnel
Name: ROBERT A. ARKO
Email: info at usap-data.org
Contact Address:
Lamont-Doherty Earth Observatory
61 Route 9W
City: Palisades
Province or State: NY
Postal Code: 10964
Country: USA


Personnel
PHILIP WANNAMAKER
Role: INVESTIGATOR
Email: pewanna at egi.utah.edu
Contact Address:
University of Utah
City: Salt Lake City
Province or State: UT
Postal Code: 84108
Country: US



Creation and Review Dates
DIF Creation Date: 2012-11-12
Last DIF Revision Date: 2012-11-13

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