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Geology; October 1992; v. 20; no. 10; p. 911-914; DOI: 10.1130/0091-7613(1992)020<0911:FABRIT>2.3.CO;2
© 1992 Geological Society of America
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Faulting and block rotation in the Afar triangle, East Africa: The Danakil "crank-arm" model

T. Souriot1 and J.-P. Brun1

1 Geosciences Rennes, Campus de Beaulieu, 35042 Rennes, France

Several domains of contrasted extensional deformation have been identified in the southern Afar triangle (East Africa) from fault patterns analyzed with panchromatic stereoscopic SPOT (Système Probatoire d'Observation de la Terre) images. Stretching directions and statistical orientation and offset variations of faults fit with the Danakii "crank-arm" model of Sichler: A 10° sinistral rotation of the Danakil block explains the fault geometry and dextral block rotation in the southern part of the Afar triangle, as well as the oblique extension in the Tadjoura Gulf. Analogue modeling supports this interpretation.




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