The Uluguru Mountains of eastern Tanzania represent a key area to unravel the tectonic history of Gondwana assembly along the Neoproterozoic East African Orogen. On the basis of combined structural and 40Ar/39Ar geochronological investigations, we have re-interpreted the structural architecture of the region. Texturally-late, ductile to cataclastic low-angle tectonic contacts are recognised, which delimit the contacts between the main lithological units that form a post-metamorphic, NW-verging nappe stack. 40Ar/39Ar geochronology places this nappe-forming event at about 550 Ma, post-dating tonalitic dyke emplacement at about 580 Ma. Results from this study (i) demonstrate that a distinct and later episode of convergence occurred in the region at about 550 Ma, when previous structural elements of the East African Orogen were finally juxtaposed; and (ii) allow to extend models involving the polyphase assembly of Gondwana to East Africa

Rossetti, F., Cozzupoli, D., & Phillips, D. (2008). Compressional reworking of the East African Orogen in the Uluguru Mountains of eastern Tanzania at ~550 Ma: implications for the final assembly of Gondwana. TERRA NOVA, 20, 59-67.

Compressional reworking of the East African Orogen in the Uluguru Mountains of eastern Tanzania at ~550 Ma: implications for the final assembly of Gondwana

ROSSETTI, FEDERICO;COZZUPOLI D;
2008

Abstract

The Uluguru Mountains of eastern Tanzania represent a key area to unravel the tectonic history of Gondwana assembly along the Neoproterozoic East African Orogen. On the basis of combined structural and 40Ar/39Ar geochronological investigations, we have re-interpreted the structural architecture of the region. Texturally-late, ductile to cataclastic low-angle tectonic contacts are recognised, which delimit the contacts between the main lithological units that form a post-metamorphic, NW-verging nappe stack. 40Ar/39Ar geochronology places this nappe-forming event at about 550 Ma, post-dating tonalitic dyke emplacement at about 580 Ma. Results from this study (i) demonstrate that a distinct and later episode of convergence occurred in the region at about 550 Ma, when previous structural elements of the East African Orogen were finally juxtaposed; and (ii) allow to extend models involving the polyphase assembly of Gondwana to East Africa
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11590/141595
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