Geophysical studies in the Ross Sea region

Davey, F. J.

doi:10.1080/03036758.1981.10423336

Cited by 46 publications

(24 citation statements)

References 15 publications

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“…The Transantarctic Mountains (TAM) ( The eastern side of the TAM, termed the Transantarctic Mountain Front, borders the Ross Embayment, a vast submerged region of extended continental crust [Davey, 1981].…”

Section: Introductionmentioning

confidence: 99%

Shear‐wave velocities under the Transantarctic Mountains and terror rift from surface wave inversion

Bannister

Snieder

Passier

2000

Geophysical Research Letters

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Section: Introductionmentioning

confidence: 99%

Shear‐wave velocities under the Transantarctic Mountains and terror rift from surface wave inversion

Bannister

Snieder

Passier

2000

Geophysical Research Letters

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“…The Eastern Basin underlies most of the Ross Sea to the east of 180 0 and extends from the continental slope southwards under the Ross Ice Shelf (Davey 1981). The sedimentary layers dip gently towards the centre of the basin and towards the shelf edge where the dip steepens sharply.…”

Section: The Sedimentary Basins the Eastern Basinmentioning

confidence: 99%

“…The sediments in the deeper part of the trough are thus probably much older than Miocene in age. Davey (1981) postulates an early l'ertiw:y age, suggesting that the graben formed as a failed arm of the spreading centre which abutted the continental margin of western Ross Sea about 55 Ma (Weissel et al 1977). …”

Section: The Central Troughmentioning

confidence: 99%

“…6 together with data on the Ross Ice Shelf and on land summarised by Davey (1981). The depth from sealevel to the maximum seismic velocity measured together with that velocity are given at each observation point.…”

Section: '"mentioning

confidence: 99%

“…The sequences are known from drilling results to c~mtain s~diments of Neogene age, but early TertIary sediments are only found as erratics. How.ever, Houtz & Davey (1973) and Davey (1981) conSider that the deeper sediments in the Ross Sea basins would probably be at least early Tertiary in age .and possibly as old as Late Cretaceous. Wong & Chnstoffel (1981) also suggest an early Tertiary age for the oldest sediments underlying McMurdo Sound.…”

Section: Introductionmentioning

confidence: 99%

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Sedimentary basins of the Ross Sea, Antarctica

Davey¹,

Bennett²,

Houtz

1982

New Zealand Journal of Geology and Geophysics

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Seismic refraction and variable angle reflection measurements made using sonobuoys at 48 sites in the Ross Sea have been interpreted to define seismic velocity-depth structure of the deep sedimerttary basins underlying the Ross Sea. Three major basins exist in the region and the data show distinctly different seismic velocity-depth functions for each. In the east the continental shelf is underlain by a basin containing up to 4 km of sediments which show a simple linear increase in velocity with depth. This basin is considered to have formed partially in response to loading by glacial sediments since the Oligocene. A major trough of sediments, also up to 4 km deep, underlies the western part of central Ross Sea. The velocity-depth functions consist of several (usually 3) segments with linear velocity increase with depth, with the gradient of the segments increasing with depth. The trough is aligned approximately north-south and is considered to have been: formed by a failed crustal rift in the Late Cretaceous or early Tertiary. The third sediment basin is a trough running along the eastern side of the Transantarctic Mountains from McMurdo Sound to Coulman Island. About 3 km of sediments occur in this trough and show a distinct layered velocity structure. The trough has formed in association with the uplift of the Transantarctic Mountains, possibly as a result of compressive lithospheric -motion.

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Controls on circum-Antarctic grounding-line sinuosity

Simkins

Stearns

Riverman³

2021

Preprint

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Mapping modern and paleo-grounding lines around the Antarctic Ice Sheet elucidates processes occurring at the grounded ice-ocean interface. Positional differences across individual grounding lines manifest as longitudinal (plan-view) grounding line sinuosity. We explore the causes and significance of such sinuosity by coupling observations of contemporary Antarctic grounding lines and paleo-grounding lines expressed as ice-marginal landforms, specifically focusing on the role that bed topography may play in influencing grounding-line sinuosity. For equal-length grounding-line segments, modern and paleo-grounding lines have remarkably similar sinuosity distributions, with the vast majority of grounding lines being near linear. Surprisingly, grounding line sinuosity is highest on low sloping beds and lower on rougher beds, even for grounding lines that are clearly pinned on topographic highs. For contemporary grounding lines, sinuosity is higher and more variable for grounding lines near floatation with shallow height-above-buoyancy gradients. We argue that grounding line sinuosity is a product of the combined influence of height-above-buoyancy gradient, bed slope, and bed roughness and, perhaps counterintuitively, that this relationship does not appear to be sensitive to the presence of pinning points, ice-flow speed, or the presence/absence of an ice shelf.

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Geophysical studies in the Ross Sea region

Cited by 46 publications

References 15 publications

Shear‐wave velocities under the Transantarctic Mountains and terror rift from surface wave inversion

Shear‐wave velocities under the Transantarctic Mountains and terror rift from surface wave inversion

Sedimentary basins of the Ross Sea, Antarctica

Controls on circum-Antarctic grounding-line sinuosity

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