Depositional environments for strata cored in CRP-3 (Cape Roberts Project), Victoria Land Basin, Antarctica: palaeoglaciological and palaeoclimatological inferences

Powell, R. D., Laird, M. G., Naish, T. R., Fielding, C. R., Krissek, L. A. and van der Meer, J. J. M. (2001) Depositional environments for strata cored in CRP-3 (Cape Roberts Project), Victoria Land Basin, Antarctica: palaeoglaciological and palaeoclimatological inferences. Terra Antartica, 8 3: 207-216.


Author Powell, R. D.
Laird, M. G.
Naish, T. R.
Fielding, C. R.
Krissek, L. A.
van der Meer, J. J. M.
Title Depositional environments for strata cored in CRP-3 (Cape Roberts Project), Victoria Land Basin, Antarctica: palaeoglaciological and palaeoclimatological inferences
Journal name Terra Antartica   Check publisher's open access policy
Publication date 2001
Sub-type Article
Volume number 8
Issue number 3
ISSN 1122-8628
Start page 207
End page 216
Total pages 10
Editor Peter J. Barrett
Carlo Alberto Ricci
Place of publication Siena
Publisher Terra Antartica Publication
Collection year 2001
Language eng
Subject C1
260104 Sedimentology
780104 Earth sciences
0499 Other Earth Sciences
Abstract Cape Roberts Project drill core 3 (CRP-3) was obtained from Roberts ridge, a sea-floor high located at 77°S, 12 km offshore from Cape Roberts in western McMurdo Sound, Antarctica. The recovered core is about 939 m long and comprises strata dated as being early Oligocene (possibly latest Eocene) in age, resting unconformably on ∼ 116 m of basement rocks consisting of Palaeozoic Beacon Supergroup sediments. The core includes ten facies commonly occuring in five major associations that are repeated in particular sequences throughout the core and which are interpreted as representing different depositional environments through time. Depositional systems inferred to be represented in the succession include: outer shelf, inner shelf, nearshore to shoreface each under iceberg influence, deltaic and/or grounding-line fan, and ice proximal-ice marginal-subglacial (mass flow/rainout diamictite/subglacial till) singly or in combination. The record is taken to represent the initial talus/alluvial fan setting of a glaciated rift margin adjacent to the block-uplifted Transantarctic Mountains. Development of a deltaic succession upcore was probably associated with the formation of palaeo-Mackay valley with temperate glaciers in its headwaters. At that stage glaciation was intense enough to support glaciers ending in the sea elsewhere along the coast, but a local glacier was fluctuating down to the sea by the time the youngest part of CRP-3 was being deposited. Changes in palaeoenvironmental interpretations in this youngest part of the core are used to estimate relative glacial proximity to the drillsite through time. These inferred glacial fluctuations are compared with the global δ18O and Mg/Ca curves to evaluate the potential of glacial fluctuations on Antarctica for influencing these records of global change. Although the comparisons are tentative at present, the records do have similarities, but there are also some differences that require further evaluation.
Keyword Cenozoic
depositional environment
glaciation
paleoclimate
paleoenvironment
Q-Index Code C1

Document type: Journal Article
Sub-type: Article
Collection: Earth Systems Science Computational Centre Publications
 
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Created: Tue, 14 Aug 2007, 15:26:56 EST