Seismic Record of Glacial Events Affecting the Pacific Margin of the Northwestern Antarctic Peninsula

2013 ◽  
pp. 75-95 ◽  
Author(s):  
Philip J. Bart ◽  
John B. Anderson
Keyword(s):  
Antarctic Peninsula ◽  
Seismic Record ◽  
The Pacific ◽  
Pacific Margin

scholarly journals Internal structure and seismic facies of the deep-water sediment drifts off northern Graham Land, Antarctic Peninsula: results from a very high-resolution survey

1998 ◽  
Vol 27 ◽  
pp. 265-267 ◽  
Author(s):  
M. Canals ◽  
R. Urgeles ◽  
F. Estrada
Keyword(s):  
High Resolution ◽  
Antarctic Peninsula ◽  
Seismic Facies ◽  
Sediment Drifts ◽  
The Pacific ◽  
Pacific Margin ◽  
Dominant Process ◽  
Acoustic Facies ◽  
Very High ◽  
Parametric Source

High-resolution Bottom Parametric Source profiles have revealed details of the sedimentary structure of the upper 150 ms of the sediment drifts off the Pacific margin of Graham Land, Antarctic Peninsula. These profiles show that the dominant process is hemipelagic sedimentation, although instability processes are also important, as shown by the widespread presence of transparent, chaotic and semi-transparent acoustic facies. These new data are relevant to the evaluation of the palaeoenvironmental potential of the sediment drifts and show that the amount of remobilised sediment is significant in some of the drifts.

Ten-month observation of the bottom current regime across a sediment drift of the Pacific margin of the Antarctic Peninsula

1997 ◽  
Vol 9 (4) ◽  
pp. 426-433 ◽  
Author(s):  
Angelo Camerlenghi ◽  
A. Crise ◽  
C.J. Pudsey ◽  
E. Accerboni ◽  
R. Laterza ◽  
...  
Keyword(s):  
Water Flow ◽  
Antarctic Peninsula ◽  
Bottom Water ◽  
Bottom Current ◽  
Sediment Drift ◽  
The Pacific ◽  
Maintenance Stage ◽  
Pacific Margin ◽  
The Mean ◽  
The Antarctic

We present two time series of bottom current and temperature collected 8 m above the seabed on either side of a large sediment drift located on the continental rise of the Pacific margin of the Antarctic Peninsula. The mean current speed is comparable (6.2 cm s−1 and 6.1 cm s−1 respectively), but the mean direction differs by about 121°. The direction of mean flow follows the bathymetric contour, and the maximum speed never exceeds 20 cm s−1 (below the typical benthic storm threshold). The potential temperature is remarkably stable (0.11 ± 0.01°C and 0.13 ± 0.02°C at the two sites). The cross-covariance indicates a significant peak at 20.2 days lag, slightly longer than the travel time of 18.7 days calculated between the two stations following the isobaths (98.4 km) and thus providing evidence for the topographic control on bottom water flow. The observed bottom water flow is consistent with deposition of Holocene hemipelagic sediments of the ‘drift maintenance’ stage. Indicators for palaeoceanographic conditions during glacial periods of the ‘drift maintenance’ stage and the older ‘drift growth’ stage are at present too scarce to understand fully how the past oceanographic conditions influenced the evolution of the drifts.

Effects of biogenic silica on sediment compaction and slope stability on the Pacific margin of the Antarctic Peninsula

2003 ◽  
Vol 15 (3) ◽  
pp. 339-363 ◽  
Author(s):  
V. Volpi ◽  
A. Camerlenghi ◽  
C.-D. Hillenbrand ◽  
M. Rebesco ◽  
R. Ivaldi
Keyword(s):  
Slope Stability ◽  
Antarctic Peninsula ◽  
Biogenic Silica ◽  
Sediment Compaction ◽  
The Pacific ◽  
Pacific Margin ◽  
The Antarctic
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