Detail publikace

Geophysical Evidence of Cretaceous Volcanics in Logone Birni Basin (Northern Cameroon), Central Africa and consequences for the Central African rift system

POSPÍŠIL, L. LOULE, J-P.

Originální název

Geophysical Evidence of Cretaceous Volcanics in Logone Birni Basin (Northern Cameroon), Central Africa and consequences for the Central African rift system

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

Logone Birni basin, rifting, volcanics, seismic and Grav/Mag data

Autoři

POSPÍŠIL, L.; LOULE, J-P.

Rok RIV

2013

Vydáno

1. 1. 2013

Nakladatel

Elsevier

Místo

The Netherland

ISSN

0040-1951

Periodikum

TECTONOPHYSICS

Ročník

583

Číslo

1

Stát

Nizozemsko

Strany od

88

Strany do

100

Strany počet

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"
}