11:15 AM - 11:30 AM
[SMP26-09] Review and update of the Archean crustal evolution of the Napier Complex, East Antarctica
Keywords:Antarctica, Archaean, Napier Complex
The Archaean Napier Complex in East Antarctica is a 400 x 200 km large ancient craton that is characterized by a long crustal history with ages ranging from 3850 to 2450 Ma, and UHT~granulite-facies regional metamorphism at about 2550-2450 Ma. The dominant lithology is orthopyroxene-bearing felsic orthogneisses of tonalitic-trondhjemitic-granodioritic composition known as “Archean TTG”. Two-pyroxene granulite, garnet-bearing granitic gneiss, and other quartzo-feldspathic gneisses are major constituents. Various metasedimentary gneisses such as garnet gneiss, garnet-sillimanite gneiss, quartzite/siliceous gneiss, magnetite-quartz gneiss (meta-ironstone), and aluminous and magnesian gneisses occur.
The crustal history of the Napier Complex has been reviewed and discussed by Sheraton et al. (1987), Kelly and Harley (2005), Harley and Kelly (2007), and Hokada et al. (2008). Since then, a number of new data have been published, and this review summarizes the update of the crustal evolution of the Napier Complex.
The crustal history of the Napier Complex has been reviewed and discussed by Sheraton et al. (1987), Kelly and Harley (2005), Harley and Kelly (2007), and Hokada et al. (2008). Since then, a number of new data have been published, and this review summarizes the update of the crustal evolution of the Napier Complex.