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- W1969772016 abstract "Two most controversial aspects of Nigerian geology are the petrology and stratigraphic position of the Abakaliki pyroclastics and the origin and evolution of the Benue trough. The pyroclastics are considered by some workers as lower Benue's oldest volcanic rocks, formed during the rifting of the Afro-Brazilian plate in early Cretaceous time that led to the origin of the Benue trough. The rocks were described variously as andesitic tuffs, degraded alkali basalts, or spilites. This study shows that the deposits are discrete, elongate or oval shaped bodies, emplaced as valley fills. They show several types of primary structures, such as parallel lamination, cross-lamination, and graded bedding and have abundant mudrock xenoliths derived from older rocks of the Asu River group. The rocks are mostly lithic or scoriaceous lapillistone whose composition has undergone extensive alterations. The geochemical study indicates that the pyroclastics were derived from a silica-undersaturated alkaline magma. The rocks overlie unconformably folded Santonian and pre-Santonian formations. These and other findings lead to the conclusion that the pyroclastics are much younger (late Santonia) than the Benue trough (early Cretaceous) and are therefore unrelated to the event that led to the origin of the trough." @default.
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- W1969772016 date "1984-01-01" @default.
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- W1969772016 title "Pyroclastics from the lower Benue trough of Nigeria and their tectonic implications" @default.
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- W1969772016 doi "https://doi.org/10.1016/0899-5362(84)90008-3" @default.
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