HR: 0800h
AN: T11A-1233    [Abstracts]
TI: Seismic Stratigraphy of the Terror Rift, Southern McMurdo Sound, Antarctica
AU: * Whittaker, J
EM: whittajoan@student.vuw.ac.nz
AF: Victoria University of Wellington, P.O. Box 600, Wellington, 1000 New Zealand
AU: Henrys, S
EM: s.henrys@gns.cri.nz
AF: Geological and Nuclear Sciences, PO Box 30368, Lower Hutt, 1000 New Zealand
AU: Wilson, T
EM: twilson@mps.ohio-state.edu
AF: Ohio State University, 130 Orton Hall, Columbus, OH 43210-1522 United States
AU: Lawver, L
EM: lawver@utig.ig.utexas.edu
AF: University of Texas at Austin, Institute for Geophysics, 4412 Spicewood Springs Rd. #600, Austin, TX 78759-8500 United States
AU: Barrett, P
EM: Peter.Barrett@vuw.ac.nz
AF: Victoria University of Wellington, P.O. Box 600, Wellington, 1000 New Zealand
AU: Naish, T
EM: tim.naish@gns.cri.nz
AF: Geological and Nuclear Sciences, PO Box 30368, Lower Hutt, 1000 New Zealand
AB: During the austral summer of 2004 the RVIB Nathanial B Palmer (NBP0401) collected 2000 km of multi-channel and 500 km of single-channel seismic data over the Terror Rift and western Victoria Land Basin, Antarctica (VLB). Here we summarize the results of integrating the data from the VLB margin with other reflection data and with lithological information from Cape Roberts (CRP) and CIROS drillholes, which sampled in CRP-1 to 3 a 1500-m-thick sequence of near-shore glaciomarine strata deposited over 70 cycles between 34 and 17 Ma ago. The stratigraphic framework is based on distinct, regionally traceable horizons that correspond to significant and recognizable changes in glaciomarine sequence geometry and can be interpreted as recording a basin-wide climate and tectonic events. These horizons can be traced from the cores for many kilometres in both coast-parallel and coast-normal directions. The seismic data also reveal a sedimentary succession in the Terror Rift (Late Miocene and younger in age) that reaches up to 2.5 s (at least 3500 m in thickness), which overlies the succession sampled by CRP drillholes.
DE: 8109 Continental tectonics--extensional (0905)
DE: 3025 Marine seismics (0935)
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting