The Abakaliki pyroclastics – Eastern Nigeria: new age and tectonic implications
- 1 January 1974
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 111 (1) , 65-69
- https://doi.org/10.1017/s0016756800000467
Abstract
Summary: Basic to intermediate pyroclastic rocks of pre-Albian age are overlain by the Abakaliki shale of Asu River Group in Eastern Nigeria. The shale has been assigned Albian age on the basis of abundant (middle Albian?) ammonites found in it. It was folded (together with the pyroclastics) about a NE–SW trending anticlinal axis during the Santonian time. This new evidence of an early Cretaceous volcanism supports a pre-Albian rifting of the African shield prior to the opening of the Southern Atlantic. The latter event took place (probably in stages) during Albian time (i.e. less than 110 Ma ago), with a widespread marine transgression in West Africa and South America.Keywords
This publication has 7 references indexed in Scilit:
- Comments on “timing of break-up of the continents round the Atlantic as determined by palaeomagnetism” by E.E. Larson and L. La Fontain, Earth and planetary science Letters 8 (1970) 341 – 344Earth and Planetary Science Letters, 1971
- Timing of the breakup of the continents around the atlantic as determined by paleomagnetismEarth and Planetary Science Letters, 1970
- The geology and petrography of the pyroxene-microdiorite of Eziator Hill, Eastern Nigeria
- Ammonite Biostratigraphy, Continental Drift and Oscillatory TransgressionsNature, 1969
- South Atlantic continental drift and the Benue TroughTectonophysics, 1968
- The Niger Delta Region in the Light of the Theory of Continental DriftGeological Magazine, 1966
- Outline of Geology of Niger Delta: ABSTRACTAAPG Bulletin, 1966