Age, correlation, and provenance of the neoproterozoic skelton group, Antarctica: grenville age detritus on the margin of east Antarctica

Wysoczanski, R.J., and Allibone, A.H. (2004) Age, correlation, and provenance of the neoproterozoic skelton group, Antarctica: grenville age detritus on the margin of east Antarctica. Journal of Geology, 112 (4). pp. 401-416.

PDF (Published Version) - Published Version
Download (905Kb)
View at Publisher Website:


Detrital zircon U‐Pb ages constrain the age and provenance of the Skelton Group in southern Victoria Land, one of several Proterozoic‐Cambrian metasedimentary units that form basement to the Ross Orogen in East Antarctica. The age of the youngest detrital zircons combined with previous dating of crosscutting intrusive rocks indicates deposition of the northern and southern parts of the Skelton Group between ca. 1050–535 and ca. 950–551 Ma, respectively. Many zircons in the northern part of the Skelton Group crystallized after partial melting during upper amphibolite facies metamorphism at ca. 505–480 Ma, although older ca. 550‐Ma metamorphic zircon rims indicate an earlier episode of high‐grade metamorphism. Detrital zircon ages from the Skelton Group are dominated by ca. 1300–950‐Ma ages similar to those in the Beardmore Group in East Antarctica and the Adelaidean succession of South Australia, suggesting that these rocks are generally correlative. Zircons that crystallized at ca. 1050 Ma form the major age population of the northern Skelton Group, while a broader range of Neoproterozoic zircons form significant components in other sediments deposited on the margin of East Antarctica–Australia at this time, indicating a close proximity to exposed Grenville age crust. Inferred basement rocks of Grenville age beneath the Ross Orogen in East Antarctica (represented by a potential 1049 ± 11‐Ma orthogneiss), Paleozoic cover in eastern Australia, and ice in Marie Byrd Land in West Antarctica are potential sources for the Grenville age component in these Neoproterozoic sedimentary rocks.

Item ID: 13898
Item Type: Article (Refereed Research - C1)
Additional Information:

Reproduced with permission from Journal of Geology. © 2004 by The University of Chicago. All rights reserved.

ISSN: 1537-5269
Date Deposited: 11 Nov 2010 02:03
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040314 Volcanology @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
Citation Count from Web of Science Web of Science 20
Downloads: Total: 116
Last 12 Months: 5
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page