Monday, 27 August 2007 - 2:10 PM
1.P1.A-3
Comprehensive Downhole and Core Physical-Property Measurements at the AND-1B Drillsite, ANDRILL McMurdo Ice Shelf Project
Frank Niessen1, Roger Morin2, Trevor Williams3, Stuart A. Henrys4, Travis Crosby5, Dhiresh Hansaraj6, Diana Magens1, and A. Catalina Gebhardt1. (1) Alfred Wegener Institute for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven, 27568, Germany, (2) U.S. Geological Survey, Mail Stop 403, Denver Federal Center, Denver, CO 80225, (3) Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades, NY 10964, (4) GNS Science, 1 Fairway Drive, Avalon, Lower Hutt, New Zealand, (5) Department of Geology & Geophysics, University of Utah, Salt Lake City, UT 84112-1183, (6) Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington, New Zealand
As part of the ANDRILL McMurdo Ice Shelf (MIS) Project two comprehensive sets of geophysical data were collected on ice at the AND-1B drillsite. Whole-core physical properties were determined with high vertical resolution to a depth of 1285 mbsf. A multi-sensor-core-logger was used to determine bulk density, sonic velocity, magnetic susceptibility and electrical resistivity. After drilling, a set of downhole measurements was collected, which consisted of caliper, temperature, fluid conductivity, induction resistivity, magnetic susceptibility, natural gamma activity, acoustic televiewer, borehole deviation, and dipmeter. In addition, three vertical seismic profiles (VSP) were obtained. Physical properties were used for initial core characterization and on-site correlation with seismic modeling. Lithology and stratigraphic units are in good agreement with changes in the pattern of the physical properties. The resulting data are amenable to studies of cyclicity and climate, cementation and compaction history, heat flux and fluid flow, and structure and stress.