Mega-Scale Glacial Lineations and Grounding-Zone Wedges in Prydz Channel, East Antarctica

• Published in: Geological Society, London, Memoirs
• Main Authors: Guitard, Michelle E., Shevenell, Amelia E., Lavoie, Caroline, Domack, Eugene W.
• Format: Book Part
• Language: unknown
• Published: Digital Commons @ University of South Florida 2016
• Subjects: Life Sciences; Antarctic; East Antarctica; Prydz Bay; East Antarctic Ice Sheet; Amery; Amery Ice Shelf; Lambert Glacier; Prydz Channel; Antarc*; Antarctica; Ice Sheet; Ice Shelf
• Online Access: https://digitalcommons.usf.edu/msc_facpub/594; https://doi.org/10.1144/M46.110

The Prydz Bay continental shelf was sculpted by the Lambert Glacier–Amery Ice Shelf system, a large outlet glacier that drains 16% of the East Antarctic Ice Sheet (Allison 1979; Fig. 1a). Prydz Channel (71–73° E; Fig. 1b) is a NW-trending cross-shelf trough (500–700 m deep) in western Prydz Bay that formed in the Pliocene, when the Lambert-Amery system first developed a fast-flowing ice stream (Fig. 1b; Cooper & O'Brien 2004). In Prydz Channel mega-scale glacial lineations (MSGLs) delineate the direction and orientation of past ice flow, and large grounding-zone wedges (GZWs; Batchelor & Dowdeswell 2015) in the inner channel mark the limit of the Last Glacial Maximum (LGM) ice advance about 250 km from the shelf edge (Fig. 1c, d, e).