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In-situ U-Pb geochronology and Hf isotope analyses of the Rayner Complex, east Antarctica
Citation
Halpin, JA and Gerakiteys, CL and Clarke, GL and Belousova, EA and Griffin, WL, In-situ U-Pb geochronology and Hf isotope analyses of the Rayner Complex, east Antarctica, Contributions to Mineralogy and Petrology, 148, (6) pp. 689-706. ISSN 0010-7999 (2005) [Refereed Article]
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Copyright Statement
Copyright 2004 Springer-Verlag
DOI: doi:10.1007/s00410-004-0627-6
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 Details
Item Type: | Refereed Article |
---|---|
Keywords: | U-Pb zircon, Lu-Hf isotopes, Pb-loss, Rayner Complex, east Antarctica |
Research Division: | Earth Sciences |
Research Group: | Geology |
Research Field: | Geochronology |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Halpin, JA (Dr Jacqueline Halpin) |
ID Code: | 75906 |
Year Published: | 2005 |
Web of Science® Times Cited: | 88 |
Deposited By: | Centre for Ore Deposit Research - CODES CoE |
Deposited On: | 2012-02-20 |
Last Modified: | 2012-12-03 |
Downloads: | 3 View Download Statistics |
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