Indentor-escape, delamination and orogenic collapse of the ca. 600-500 Ma East African/Antarctic Orogen in Mozambique and Dronning Maud Land (East Antarctica)

Jacobs, Joachim; Thomas, Robert J.; Ueda, Kosuke; Kleinhanns, Ilka; Bingen, Bernard; Engvik, Ane

NORA

Indentor-escape, delamination and orogenic collapse of the ca. 600-500 Ma East African/Antarctic Orogen in Mozambique and Dronning Maud Land (East Antarctica)

Jacobs, Joachim; Thomas, Robert J.; Ueda, Kosuke; Kleinhanns, Ilka; Bingen, Bernard; Engvik, Ane. 2010 Indentor-escape, delamination and orogenic collapse of the ca. 600-500 Ma East African/Antarctic Orogen in Mozambique and Dronning Maud Land (East Antarctica). In: GSA, Denver Annual Meeting, Denver, USA, Nov 2010. Denver, USA, Geological Society of America.

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Abstract

The East African/Antarctic Orogen (EAAO) is one of the largest orogenic belts on the planet, resulting from the collision of various parts of East and West- Protogondwana between ca. 600 and 550 Ma. The central and southern parts of the orogen are typified by high-grade rocks, representing the overprinted margins of the various colliding continental blocks. New fieldwork and geochronology in northern Mozambique reveals a protracted polyphase Ediacaran/Cambrian deformation history. New age constraints reveal high-grade metamorphism at 600-550 Ma, overprinting and older basement.

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