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Kinematic and sedimentological evolution of the Manyara Rift in northern Tanzania, East Africa

Published online by Cambridge University Press:  18 July 2005

UWE RING
Affiliation:
Institut für Geowissenschaften, Johannes Gutenberg-Universität, 55099 Mainz, Germany
HILDE L. SCHWARTZ
Affiliation:
Department of Earth Sciences, University of California, Santa Cruz, CA 95064, USA
TIMOTHY G. BROMAGE
Affiliation:
Department of Biomaterials, New York University College of Dentistry, New York, NY 10010, USA
CHARLES SANAANE
Affiliation:
P.O. Muhimbili University, Box 65453, Dar-es-Salaam, Tanzania

Abstract

We describe the stratigraphical/sedimentological and structural evolution of the Manyara Rift in the Tanzania Divergence Zone, East Africa. The rift-related Manyara Beds on the shoaling side of the Manyara Rift were deposited between <1.7 and 0.4 Ma and can be separated into a lacustrine lower member and a fluvial upper member. The transition from lacustrine to fluvial sedimentation at ∼ 0.7 Ma appears to be related to a southward shift of major rift faulting. Fault geometry and the kinematics of the faults are consistent with major faulting during NE/E-directed extension. There is also evidence for other extensional directions including radial extension, which might be caused by magmatic activity and/or might reflect oblate strain symmetry where the East African Rift propagated into the Archaean Tanzania Craton and associated termination of rifting caused an increase in the strained area.

Type
Original Article
Copyright
© 2005 Cambridge University Press

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