USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1993-028-FA

Other ID: EAST93

Status: Completed

Organization(s): USGS, Woods Hole Coastal and Marine Science Center

Funding Program(s):

Principal Investigator(s): Uri Ten Brink

Affiliate Investigator(s): Stephen Bannister - IGNS

Information Specialist(s):

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.

Vehicle(s):

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

Affiliate Staff:
Stephen Bannister - NZ Inst. Geological and Nuclear Sciences - co-Ch. Sci./Shooter; David King - NZ Inst. Geological and Nuclear Sciences - Elect tech.; Mike Collins - NZ Antarctic Program - Mechanic; Bill King - NZ Antarctic Program - Search and rescue; Jan de Vries - NZ Antarctic Program - Search and rescue; Ron Hackney - Victoria Univ.
Wellington
NZ - student; Rafael Katzman - WHOI - student; Yizhaq Makovsky - Stanford - student

Notes:
Project = EAST93, EAST93

Location:

Taylor Dome, Lashly Mountain, Transantarctic Mountains, Wilkes Basin, East Antarctic Polar Plateau, Antarctica;

Boundaries
North: -77.5 South: -78.5 West: 158 East: 142

Platform(s):

photo of Tracked Vehicle
Tracked Vehicle

Publications

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.

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Multichannel seismics --- Multichannel
LaCoste-Romberg gravimeter G-179 --- Gravity
Geometrics G-856 magnetometer --- Magnetics
GPS (wh) --- Navigation