Superimposed tectonic events at 2450 Ma, 2100 Ma, 900 Ma and 500 Ma in the North Mawson Escarpment, Antarctic Prince Charles Mountains
Adrian F Corvino, Steven D Boger, Friedhelm Henjes-Kunst, Christopher JL Wilson, Ian CW Fitzsimons
PRECAMBRIAN RESEARCH | ELSEVIER | Published : 2008
The North Mawson Escarpment, in Antarctica's Prince Charles Mountains, forms part of a Palaeoproterozoic crustal complex which separates Archaean cratonic material to the south from Early Neoproterozoic and Early Palaeozoic metamorphic belts to the north. It consists of nappe-like masses of grey gneiss and metasupracrustal rocks that were subjected to repeated ductile deformation under upper amphibolite to lower granulite facies metamorphic conditions. In this paper, we report zircon U-Pb dating results that constrain the principal tectonothermal events to the periods 2490-2420 Ma, 2180-2080 Ma, 940-880 Ma and 530-490 Ma. The magmatic precursors of volumetrically important grey gneiss were p..View full abstract
Fieldwork for this study was part of the 2002-2003 Prince Charles Mountains Expedition of Germany and Australia funded by the Australian Antarctic Division and Bundesanstalt fur Geowissenschaften und Rohstoffe. We thank members of the Australian National Antarctic Research Expeditions for their friendship and logistic support, in particular Bill Baxter and Gary Kuehn for their field guidance. Eugene Mikhalsky and Nigel Kelly are thanked for their thorough and helpful reviews. Peter Cawood is thanked for his editorial handling.