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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Magma-driven antiform structures in the Afar rift: The Ali Sabieh range, Djibouti
Journal of Structural Geology, Volume 32, No. 6, Year 2010
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Description
The Ali Sabieh Range, SE Afar, is an antiform involving Mesozoic sedimentary rocks and synrift volcanics. Previous studies have postulated a tectonic origin for this structure, in either a contractional or extensional regime. New stratigraphic, mapping and structural data demonstrate that large-scale doming took place at an early stage of rifting, in response to a mafic laccolithic intrusion dated between 28 and 20 Ma from new K-Ar age determinations. Our 'laccolith' model is chiefly supported by: (i) the geometry of the intrusion roof, (ii) the recognition of roof pendants in its axial part, and (iii) the mapping relationships between the intrusion, the associated dyke-sill network, and the upper volcanic/volcaniclastic sequences. The laccolith is assumed to have inflated with time, and to have upwardly bent its sedimentary roof rocks. From the architecture of the ~1 km-thick Mesozoic overburden sequences, ca. 2 km of roof lifting are assumed to have occurred, probably in association with reactivated transverse discontinuities. Computed paleostress tensors indicate that the minimum principal stress axis is consistently horizontal and oriented E-W, with a dominance of extensional versus strike-slip regimes. The Ali Sabieh laccolith is the first regional-scale magma-driven antiform structure reported so far in the Afro-Arabian rift system. © 2010 Elsevier Ltd.
Authors & Co-Authors
Le Gall, Bernard
France, Rennes
Université Européenne de Bretagne
Daoud, Mohamed Ahmed
Djibouti, Djibouti
Centre D'etudes et de Recherche de Djibouti
Maury, René C.
France, Rennes
Université Européenne de Bretagne
Rolet, Joël
France, Rennes
Université Européenne de Bretagne
Guillou, Hervè
France, Gif-sur-yvette
Laboratoire Des Sciences du Climat et de L'environnement
Sue, Christian
France, Rennes
Université Européenne de Bretagne
Statistics
Citations: 20
Authors: 6
Affiliations: 3
Identifiers
Doi:
10.1016/j.jsg.2010.06.007
ISSN:
01918141
Study Locations
Djibouti