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Thermochronologic constraints on Jurassic rift flank denudation in the Thiel Mountains, Antarctica

Open-File Report 2007-1047-SRP-044

By:
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DOI: 10.3133/ofr20071047SRP044

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Abstract

The Thiel Mountains are part of the Transantarctic Mountains (TAM) and occupy a strategic position close to the East-West Antarctic boundary. They occur in a region of relatively subdued topography distal from high topography and high relief of most of the TAM adjacent to the West Antarctic rift system. Low-temperature thermochronology on samples collected from the Reed Ridge granite on the north flank of the Thiel Mountains constrain the thermal and hence tectonic history. Apatite fission track data plus thermal models indicate cooling from ca. 165-150 Ma. In conjunction with 40Ar/39Ar K-feldspar data, the results indicate cooling was due to relatively slow erosional denudation, and not thermal relaxation following Jurassic tholeiitic magmatism. Denudation was most likely associated with the formation of the Jurassic rift system across Antarctica that marked the initial breakup of Gondwana. This is the oldest episode of denudation associated with formation of the present day TAM

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Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Thermochronologic constraints on Jurassic rift flank denudation in the Thiel Mountains, Antarctica
Series title:
Open-File Report
Series number:
2007-1047-SRP-044
DOI:
10.3133/ofr20071047SRP044
Year Published:
2007
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Description:
4 p.
Larger Work Type:
Report
Larger Work Subtype:
USGS Numbered Series
Other Geospatial:
Antarctica
Additional Online Files(Y/N):
N