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- W2337567029 abstract "The Benue Trough is a continental rift related to the opening of the equatorial domain of South Atlantic, and was initiated in the late Jurassic and early Cretaceous times. The megastructure is filled with continental and marine sediments of up to 6,500 m in thickness. Mesozoic to Cenozoic magmatism scattered throughout the Benue Trough accompanied the tectonic evolution of this rift. On the basis of trace element, major element and rare earth analysis was performed on selected samples, and also on the basis of interpretation of field, petrographic and geochemical patterns, two groups of rocks were identified: (1) a group with tholeiitic affinity; and (2) a group of alkaline affinity. Syenodiorite and pyroclastics formed structurally controlled topographic features in Ishiagu. Intermediate intrusive of syenodiorite composition and pyroclastics of picrite basalt composition formed structurally controlled topographic features in Ishiagu area of Afikpo basin, southeastern Benue Trough of Nigeria. Fragments of host Asu River Group shale are embedded in the basalt matrix, consisting mainly lapilli brecia and lapilli tuff of the pyroclastics. The syenodiorites are transitional and quartz-, pyroxene- and plagioclase-normative, while the pyroclastics with modest iron concentrations are mainly tholeiitic, with some samples quartz- and pyroxenenormative. The REE characteristics indicate strong fractionation and slight negative Eu anomalies in some of the syenodiorites to weak fractionation and no Eu anomaly in most of the pyroclastics. The rocks probably evolved by fractional crystallization of ferromagnesian minerals from irregular partial melting process generated beneath E-type mid-oceanic ridge due to hot spot activities." @default.
- W2337567029 created "2016-06-24" @default.
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- W2337567029 date "2010-12-03" @default.
- W2337567029 modified "2023-09-23" @default.
- W2337567029 title "Alkaline Magmatism in the Lower Benue Trough, Southeastern Nigeria: A Geochemical Evaluation" @default.
- W2337567029 hasPublicationYear "2010" @default.
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