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Geology of the Kottas terrane, Heimefrontfjella (East Antarctica)

By Wilfried Bauer, Joachim Jacobs, Robert J. Thomas, Gerhard Spaeth and Klaus Weber

Abstract

The Kottas Terrane is the northernmost crustal block in the Heimefrontfjella.\ud It is composed of juvenile Mesoproterozoic igneous rocks of calcalkaline\ud composition and minor sedimentary rocks, which underwent\ud amphibolite-facies metamorphism in late Mesoproterozoic times (Grenvillianage\ud orogeny). Whereas central Heimefrontfjella was strongly affected by the\ud East-African – Antarctic Orogeny in Late Neoproterzoic to Cambrian times,\ud the Kottas Terrane shows only a weak overprint at brittle/ductile transition\ud conditions, mostly manifested as northward-directed thrusts. The boundary\ud between the Kottas and Sivorg terranes of central Heimefrontfjella is marked\ud by the prominent Heimefront Shear Zone, which is exposed in two small\ud nunataks immediately south of the main massif of Kottasberge

Topics: Earth Sciences
Publisher: Deutschen Gesellschaft für Polarforschung
Year: 2009
OAI identifier: oai:nora.nerc.ac.uk:8955

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