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Extremely low long‐term erosion rates around the Gamburtsev Mountains in interior East Antarctica

Cox, S. E. and Thomson, S. N. and Reiners, P. W. and Hemming, S. R. and van de Flierdt, T. (2010) Extremely low long‐term erosion rates around the Gamburtsev Mountains in interior East Antarctica. Geophysical Research Letters, 37 . Art. No. L22307 . ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20101220-100635447

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Abstract

The high elevation and rugged relief (>3 km) of the Gamburtsev Subglacial Mountains (GSM) have long been considered enigmatic. Orogenesis normally occurs near plate boundaries, not cratonic interiors, and large‐scale tectonic activity last occurred in East Antarctica during the Pan‐African (480–600 Ma). We sampled detrital apatite from Eocene sands in Prydz Bay at the terminus of the Lambert Graben, which drained a large pre‐glacial basin including the northern Gamburtsev Mountains. Apatite fission‐track and (U‐Th)/He cooling ages constrain bedrock erosion rates throughout the catchment. We double‐dated apatites to resolve individual cooling histories. Erosion was very slow, averaging 0.01–0.02 km/Myr for >250 Myr, supporting the preservation of high elevation in interior East Antarctica since at least the cessation of Permian rifting. Long‐term topographic preservation lends credence to postulated high‐elevation mountain ice caps in East Antarctica since at least the Cretaceous and to the idea that cold‐based glaciation can preserve tectonically inactive topography.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2010GL045106DOIUNSPECIFIED
http://www.agu.org/journals/gl/gl1022/2010GL045106/PublisherUNSPECIFIED
Additional Information:© 2010 American Geophysical Union. Received 12 August 2010; revised 30 September 2010; accepted 4 October 2010; published 20 November 2010. This work was supported by NSF-ANT0538580 and -ANT0817163. This work also benefited from discussions with the Earth System Evolution Program of the Canadian Institute for Advanced Research. Analytical assistance from Stefan Nicolescu is appreciated. We thank Stefanic Brachfeld, George Gehrels, Steve Goldstein, and Tom Wagner for samples and discussion. We acknowledge the FSU Antarctic Research Facility and the IODP for core samples. We thank John J. Veevers for extensive review comments.
Funders:
Funding AgencyGrant Number
NSFANT0538580
NSFANT0817163
Subject Keywords:thermochronology; East Antarctica; Gamburtsev Mountains; erosion rates; Prydz Bay; Lambert Graben ; 1140 Geochronology: Thermochronology; 9310 Geographic Location: Antarctica (4207); 1051 Geochemistry: Sedimentary geochemistry; 1040 Geochemistry: Radiogenic isotope geochemistry.
Record Number:CaltechAUTHORS:20101220-100635447
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101220-100635447
Official Citation:Cox, S. E., S. N. Thomson, P. W. Reiners, S. R. Hemming, and T. van de Flierdt (2010), Extremely low long‐term erosion rates around the Gamburtsev Mountains in interior East Antarctica, Geophys. Res. Lett., 37, L22307, doi:10.1029/2010GL045106
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21429
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Dec 2010 19:23
Last Modified:26 Dec 2012 12:46

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