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POSPÍŠIL, L. LOULE, J-P.
Original Title
Geophysical Evidence of Cretaceous Volcanics in Logone Birni Basin (Northern Cameroon), Central Africa and consequences for the Central African rift system
Type
journal article in Web of Science
Language
English
Original Abstract
Detailed analyses and interpretation realized by combining existing 2D reflection seismic and Gravity/Magnetic data of the Logone Birni Basin (LBB) in the West and Central African Rift System (WCAS) have revealed the distribution of the main buried volcanic bodies as well as their relationships with the structural and tectonic evolution of this basin. The volcanic activity in the LBB is restricted to the Cretaceous period. Three main volcanic episodes are identified and are associated to the Neocomian, Late Albian and Cenomanian-Turonian rifting phases respectively. The volcanic bodies within the Lower Cretaceous are either lying directly on basement or are mainly interbedded with the contemporaneous sediments whereas the Upper Cretaceous bodies are morphologically expressed in the forms of dykes and sills. The volcanic activity was more intense in the western region of the central LBB (Zina sub-basin) along the Cameroon-Nigeria border whereas it was scanty and scattered in the other parts of the basin. The main volcanic dykes are found on the flanks of the major faults bounding basement horsts or in crestal positions in association with syndepositional faults. Although WCAS is associated with large amount of crustal extension and minor volcanism, the intense volcanic activity observed in LBB during the Cretaceous suggests that the intrusive zone during this period was confined to the basement beneath this triple junction area. Tensional stresses generated by this localized domal uplift accounts for most of the observed tectonic structures in the LBB where major faults transected the entire lithosphere, thus providing conduits for magma migration.
Keywords
Logone Birni basin, rifting, volcanics, seismic and Grav/Mag data
Authors
POSPÍŠIL, L.; LOULE, J-P.
RIV year
2013
Released
1. 1. 2013
Publisher
Elsevier
Location
The Netherland
ISBN
0040-1951
Periodical
TECTONOPHYSICS
Year of study
583
Number
1
State
Kingdom of the Netherlands
Pages from
88
Pages to
100
Pages count
13
BibTex
@article{BUT97687, author="POSPÍŠIL, L. and LOULE, J-P.", title="Geophysical Evidence of Cretaceous Volcanics in Logone Birni Basin (Northern Cameroon), Central Africa and consequences for the Central African rift system", journal="TECTONOPHYSICS", year="2013", volume="583", number="1", pages="88--100", issn="0040-1951" }