Other ID: EAST93
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Principal Investigator(s): Uri Ten Brink
Affiliate Investigator(s): Stephen Bannister - IGNS
Data Type(s): Seismics: Multichannel, Electro-Magnetic: Gravity, Electro-Magnetic: Magnetics, Location-Elevation: Navigation
Scientific Purpose/Goals: By imaging the bedrock under the East Antarctic ice sheet between the Transantarctic Mountains and the Wilkes subglacial Basin, the experiment provided: 1) quantitative constraints for modeling the uplift of the Transantarctic Mountains and the subsidence of the Wilkes Basin as a flexed lithospheric plate with a free-edge at the boundary with West Antarctica; 2) mapping of the extent of the Ferrar dolerite sills and basalts inland from the mountains to discern whether they originated from an active mantle plume or from rifting and passive upwelling; and 3) analysis of the seismic stratigraphy of the Wilkes Basin sediments to resolve climatic conditions and size of the ice sheet in the Cenozoic, when parts of East Antarctica were deglaciated during much of the Late Cenozoic.
Start Date: 1993-12-01
Start Port/Location: McMurdo, Antarctica
End Date: 1994-01-29
End Port/Location: McMurdo, Antarctica
Equipment Used: Multichannel seismics, LaCoste-Romberg gravimeter G-179, Geometrics G-856 magnetometer, GPS (wh)
Information to be Derived: Morphology;
Summary of Activity and Data Gathered: Multichannel seismic reflection: 236 km; Gravity: 312.6 km; Magnetics: 312.6 km; Ground penetrating radar: 205 km
Staff: Uri Ten Brink
Taylor Dome, Lashly Mountain, Transantarctic Mountains, Wilkes Basin, East Antarctic Polar Plateau, Antarctica;
ten Brink, U., and Bannister, Stephen, 1995, EAST93 - geophysical traverse from the Transantarctic Mountains to the Wilkes Basin, East Antarctica; a joint United States-New Zealand science project: 30 URL: http://pubs.er.usgs.gov/usgspubs/ofr/ofr95225, download PDF.