Post-Rift Continental Slope and Rise Sediments from 38° E to 164° E, East Antarctica

O’Brien, Philip E; Stanley, Shawn; Parums, R.

doi:10.1007/3-540-32934-x_42

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…In the Western Wilkes Land margin, approximatively off the Totten Glacier terminus, the maximum sediment thickness (about 850 m) of deposits attributed to Unit 3 has been recorded (O'Brien et al, 2006;Donda et al, in press). High sedimentation rates could be possibly related to the progressive growth and evolution of the East Antarctic Ice Sheet.…”

Section: Discussionmentioning

confidence: 99%

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Mega debris flow deposits on the western Wilkes Land margin, East Antarctica

Donda¹,

O'Brien²,

Santis³

et al. 2007

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Multichannel seismic data collected off Western Wilkes Land (East Antarctica) reveal the occurrence of mega debris flow deposits on the lower slope and rise that were formed throughout the Miocene. Commonly, debris flow units are separated by thin deposits of well-stratified facies, interpreted as predominantly glaciomarine mixed contouritic and distal turbidite deposits. These units could act as weak layers and could have played a major role in the slope instability. High sedimentation rates, due to large amounts of sediment delivered from a temperate, wet-based ice sheet, constituted a key factor in the sediment failures. The main trigger mechanism would probably have been earthquakes enhanced by isostatic rebound following major ice sheet retreats.

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Section: Discussionmentioning

confidence: 99%

“…Thicknesses range from 90 to 250 m, with maximum values of 400 m in areas more proximal to the margin. This is the thickest debris flow in the whole area, buried below a 450-m-thick, wellstratified facies, interpreted as representing contour current-related deposits (O'Brien et al, 2006).…”

Section: Main Characteristics Of the Mega Debris Flow Deposits Of Wesmentioning

confidence: 94%

Mega debris flow deposits on the western Wilkes Land margin, East Antarctica

Donda¹,

O'Brien²,

Santis³

et al. 2007

Open-File Report

View full text Add to dashboard Cite

show abstract

“…Ice carries material plucked from Antarctic bedrock and unconsolidated material to the coast and offshore to be deposited as till, and funnelled through canyons in the slope to turbidite fans on the continental rise (e.g., O'Brien et al, 2005). Unlike contourites, which are prone to be displaced laterally by bottom currents, or ice-rafted debris (IRD), the sediment in turbidites is carried directly from bedrock in the source drainage basin via the continental slope to the abyssal plain.…”

Section: Provenance Studies Of Detrital Zircons In Neogene Turbiditesmentioning

confidence: 99%

“…Ice carries material plucked from bedrock and unconsolidated material in the Antarctic interior to the coast and offshore where it is deposited as till, and funnelled through canyons in the slope to turbidite fans on the continental rise (O'Brien et al, 2005). Two ice drainages were examined.…”

Section: Introductionmentioning

confidence: 99%