Physical properties of sediment core AND-2A

Whole-core measurements of Wet Bulk Density (WBD), compressional (P)-wave velocity (Vp), and Magnetic Susceptibility were measured at a sampling interval of 1 or 2 centimetres (cm) throughout the AND-2A drill core for initial core characterisation and on-site correlation with seismic modeling to pre...

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Bibliographic Details
Main Authors: Dunbar, Gavin B, Atkins, Cliff, Magens, Diana, Niessen, Frank, SMS Science Team
Format: Dataset
Language:English
Published: PANGAEA 2009
Subjects:
AND-2A
ANDRILL
Antarctic Geological Drilling
Density
wet bulk
DEPTH
sediment/rock
DRILL
Drilling/drill rig
Magnetic susceptibility
volume
McMurdo Sound
McMurdo Station
Multi-Sensor Core Logger
GEOTEK
Porosity
fractional
SMS
Southern McMurdo Sound
Velocity
compressional wave
Antarctic
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.744014
https://doi.org/10.1594/PANGAEA.744014
Description
Summary:Whole-core measurements of Wet Bulk Density (WBD), compressional (P)-wave velocity (Vp), and Magnetic Susceptibility were measured at a sampling interval of 1 or 2 centimetres (cm) throughout the AND-2A drill core for initial core characterisation and on-site correlation with seismic modeling to predict target-reflector depth. Measurements were made using a GEOTEK (Multi-Sensor-Core-Logger MSCL). Density and velocity standards were measured together with core runs of 3-6 metres (m) (and occasionally up to 18 m) throughout the entire depth range to monitor data quality. Drift of the magnetic susceptibility sensor was also monitored and corrected where necessary. These physical properties show a large range of values, reflecting the different nature of the various lithologies including extremely high velocity and density values in individual clasts, and the effects of cementation on porosity. A downcore increase in WBD and Vp occurs in the upper 200 m, however, no systematic trend exists at greater depths although large fluctuations on a m-decimetre- (dm) scale occur. Magnetic susceptibility is generally low (<100 x 10-5 SI), however, four intervals of high (>600 x 10-5 SI) susceptibility occur at 560, 800, 980 and 1 080 mbsf, indicating a relatively greater contribution of volcanic-derived material to the core site in the lower half of the AND-2A core.

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