Veevers, J. J. and Saeed, A. (2011): Age and composition of Antarctic bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Prydz Bay-Wilkes Land-Ross Sea-Marie Byrd Land sector; 70 degrees -240 degrees E
Leg/Site/Hole:
Related Expeditions:
DSDP 28 DSDP 28 268 DSDP 28 274
Identifier:
ID:
2012-017828
Type:
georefid
ID:
10.1016/j.gr.2011.03.007
Type:
doi
Creator:
Name:
Veevers, J. J.
Affiliation:
Macquarie University, Department of Earth and Planetary Sciences, GEMOC ARC National Key Centre, Sydney, N.S.W., Australia
Role:
author
Name:
Saeed, A.
Affiliation:
Role:
author
Identification:
Title:
Age and composition of Antarctic bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Prydz Bay-Wilkes Land-Ross Sea-Marie Byrd Land sector; 70 degrees -240 degrees E
Year:
2011
Source:
Gondwana Research
Publisher:
Elsevier on behalf of International Association for Gondwana Research, Amsterdam and Kochi, International
Volume:
20
Issue:
4
Pages:
710-738
Abstract:
The age and composition of the 14 X 10 (super 6) km (super 2) of Antarctica's surface obscured by ice is unknown except for some dates on detrital minerals. In remedy, we bring together proxies of Antarctic bedrock in the form of (1) detrital zircons analysed for U-Pb age, T (sub DM) (super C) , epsilon Hf, and rock type, including five new analyses of Neogene turbidites, (2) erratics that reflect age, composition, and metamorphism, and (3) recycled microfossils that reflect age, facies, and metamorphism. Each sample is located in its ice-drainage basin for backtracking to the potential provenance. Gaps in age between sample and upslope exposure are specifically attributable to the provenance. This work indicates that the central Antarctic provenance about a core of the Gamburtsev Subglacial Mountains (GSM) and Vostok Subglacial Highlands (VSH) contains a basement that includes igneous (mafic granitoids) and metamorphic rocks with peak U-Pb ages of 0.5-0.7, 0.9-1.3, 1.4-1.7, 1.9-2.1, 2.2-2.3, 2.6-2.8, and 3.15-3.35Ga, T (sub DM) (super C) 1.3-3.6Ga, and epsilon Hf +12 to -40. Other modeled cratons with similar ages are set in a matrix of foldbelts of 0.5-0.7Ga age. The basement in the core is surmounted by Permian red beds, at the periphery by Permian and Triassic sedimentary rocks unaffected by igneous heating or load metamorphism, and west of the Transantarctic Mountains (TAM) in the Wilkes Basin arguably by Late Cretaceous through Pliocene marine sediments. Erratics of undated red sandstone along the coast of Wilkes Land and George V Land indicate a red-bed provenance in the interior. The Prince Charles Mountains (PCM) provide an exposed example of a crust of Precambrian igneous and metamorphic rocks and Permian and Triassic sedimentary rocks. Abstract Copyright (2011) Elsevier, B.V.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:-63.5659 West:105.0920 East:
173.2538 South:-68.5949
Keywords: Geochronology; Igneous and metamorphic petrology; absolute age; age; Antarctica; bedrock; Cenozoic; clastic sediments; dates; Deep Sea Drilling Project; detrital sedimentation; DSDP Site 268; DSDP Site 274; erratics; Gamburtsev Mountains; granites; igneous rocks; Leg 28; Mac Robertson Land; mafic composition; Marie Byrd Land; Mesozoic; Neogene; Paleozoic; Permian; plutonic rocks; Precambrian; Prince Charles Mountains; Prydz Bay; Ross Sea; sedimentation; sediments; Southern Ocean; Tertiary; Transantarctic Mountains; Triassic; U/Pb; Victoria Land; Vostok Highlands; Wilkes Land;
.