Preview

PDF Restricted - Request a copy 834Kb

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, T^Hf 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:	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
Author:	Halpin, JA (Dr Jacqueline Halpin)
ID Code:	75906
Year Published:	2005
Web of Science® Times Cited:	62
Deposited By:	Centre for Ore Deposit Research - CODES CoE
Deposited On:	2012-02-20
Last Modified:	2012-12-03
Downloads:	3 View Download Statistics