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FOLDING OF THE MESOZOIC COVER IN SW SOMALIA: A COMPRESSIONAL EPISODE RELATED TO TEH EARLY STAGES OF INDIAN OCEAN EVOLUTION
Author(s) -
Boccaletti M.,
Dainelli P.,
Angelucci A.,
Arush M. A.,
Cabdulqaadir M.M.,
Nafissi P.,
Nafissi P.,
Piccoli G.,
Robba E.
Publication year - 1988
Publication title -
journal of petroleum geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 42
eISSN - 1747-5457
pISSN - 0141-6421
DOI - 10.1111/j.1747-5457.1988.tb00810.x
Subject(s) - geology , cretaceous , paleontology , mesozoic , sinistral and dextral , unconformity , structural basin , sedimentary depositional environment , tectonics , sedimentary rock , subsidence
The tectonic‐sedimentary evolution of SW and central Somalia is characterized by two main depositional cycles. The first cycle (Triassic to Early Cretaceous) is characterized by subsiding basins related to a process of crustal thinning, and is associated with the separation of Madagascar from Africa, between 165 and 121 Ma*. The second cycle, starting in the Late Cretaceous with a regional unconformity, is related to the separation and NEward drift of India, at approximately 80 Ma. The folds that affect the Jurassic and Early Cretaceous formations of the Lugh‐Mandera basin in SW Somalia are the result of a compressive phase connected with dextral transcurrent movements along NE‐S W trending fracture zones. These zones are developed parallel to the oceanic system of transform faults, in connection with the change in the stress regime intervening at the shift of the direction of spreading between the first and the second stages of evolution of the Indian Ocean.