Preview

PDF 9Mb

Wilkes Land is a key region for studying the configuration of Gondwana and for appreciating the role of tectonic boundary conditions on East Antarctic Ice Sheet (EAIS) behavior. Despite this importance, it remains one of the largest regions on Earth where we lack a basic knowledge of geology. New magnetic, gravity, and subglacial topography data allow the region's first comprehensive geological interpretation. We map lithospheric domains and their bounding faults, including the suture between Indo-Antarctica and Australo-Antarctica. Furthermore, we image subglacial sedimentary basins, including the Aurora and Knox Subglacial Basins and the previously unknown Sabrina Subglacial Basin. Commonality of structure in magnetic, gravity, and topography data suggest that pre-EAIS tectonic features are a primary control on subglacial topography the preservation of this relationship after glaciation suggests that these tectonic features provide topographic and basal boundary conditions that have strongly influenced the structure and evolution of the EAIS. Key Points Wilkes Land geology is comprehensively characterized for the first time New and known continent-scale faults and sedimentary basins are defined These major tectonic features define current subglacial topography © 2014. American Geophysical Union. All Rights Reserved.

Item Type:	Refereed Article
Keywords:	East Antarctica, Gondwana, Columbia, Rodinia, East Antarctic Ice Sheet
Research Division:	Earth Sciences
Research Group:	Physical Geography and Environmental Geoscience
Research Field:	Glaciology
Objective Division:	Expanding Knowledge
Objective Group:	Expanding Knowledge
Objective Field:	Expanding Knowledge in the Environmental Sciences
UTAS Author:	Roberts, JL (Dr Jason Roberts)
ID Code:	92301
Year Published:	2014
Web of Science® Times Cited:	71
Deposited By:	CRC-Antarctic Climate & Ecosystems
Deposited On:	2014-06-13
Last Modified:	2017-11-30
Downloads:	129 View Download Statistics