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In-situ U–Pb geochronology and Hf isotope analyses of the Rayner Complex, east Antarctica

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Halpin, JA and Gerakiteys, CL and Clarke, GL and Belousova, EA and Griffin, WL (2005) In-situ U–Pb geochronology and Hf isotope analyses of the Rayner Complex, east Antarctica. Contributions to Mineralology and Petrology, 148 (6). pp. 689-706. ISSN 0010-7999 (Print), 1432-0967 (Online)

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Abstract

In-situ zircon U–Pb and Hf isotopic analysis via laser ablation microprobe-inductively coupled plasma mass spectrometer (LAM-ICPMS) of samples from Kemp and MacRobertson Lands, east Antarctica suggests that the Kemp Land terrane evolved separately from the rest of the Rayner Complex prior to the ca. 940 Ma Rayner Structural Episode. Several Archaean metamorphic events in rocks from western Kemp Land can be correlated with events previously reported for the adjacent Napier Complex. Recently reported ca. 1,600 Ma isotopic disturbance in rocks from the Oygarden Group may be correlated with a charnockitic intrusion in the Stillwell Hills before ca. 1,550 Ma. Despite being separated by some 200 km, THf DM ages indicate felsic orthogneiss from Rippon Point, the Oygarden Group, Havstein Island and the Stillwell Hills share a ca. 3,660–3,560 Ma source that is indistinguishable from that previously reported for parts of the Napier Complex. More recent additions to this crust include Proterozoic charnockite in the Stillwell Hills and the vicinity of Mawson Station. These plutons have distinct 176Hf/177Hf ratios and formed via the melting of crust generated at ca. 2,150–2,550 Ma and ca. 1,790–1,870 Ma respectively.

Item Type: Article
Keywords: geochronology; Rayner Complex, east Antarctica; LAM-ICPMS; zircon; hafnium
Journal or Publication Title: Contributions to Mineralology and Petrology
Page Range: pp. 689-706
ISSN: 0010-7999 (Print), 1432-0967 (Online)
Identification Number - DOI: 10.1007/s00410-004-0627-6
Additional Information: The original publication is available at www.springerlink.com
Date Deposited: 04 Jun 2008 02:46
Last Modified: 18 Nov 2014 03:41
URI: http://eprints.utas.edu.au/id/eprint/6554
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