s: The study areas, Lower Benue Trough is divided into Asu River Group (ARG) and Cross River Grou... more s: The study areas, Lower Benue Trough is divided into Asu River Group (ARG) and Cross River Group (CRG) and it is delimited by longitudes 7°00'E and 8°30'E and latitudes 5°00'N and 6°30'N. ARG covers Awi, Abakaliki and Mfamosing Formations while Ekenkpon, Eze-Aku, New Netim, Awgu and Agbani Formations fall within CRG. Sampling was done to cover both the Abakaliki Anticlinorium and Calabar Flank. The study aimed at using geochemical approach through rare earth elements (REE) to deduce provenance and depositional environment in a holistic manner which hitherto has not been used by any worker. A total of 56 fresh outcrop samples were obtained from the study area. The samples were subjected to detailed lithologic description by visual examination. Geochemical analysis was done using Inductively Coupled Plasma Mass Spectroscopy (ICP-MS) to determine trace and rare-earth elements using lithium metaborate/tetraborate fusion method. The chondrite normalized REE plots shows enrichment in the LREE over the HREE with negative Eu anomaly for both ARG and CRG. While the (Eu/Eu*) average for ARG and CRG are 0.74 and 0.73 respectively indicating Quartzose sedimentary, Intermediate igneous and Felsic igneous provenances for the sediments. The Cerium anomaly (Ce/Ce*) values average 1.20 and1.68 in ARG and CRG respectively indicating oxidizing and shallow marine environment. The REE pattern is consistent with that of the Upper Continental Crust (UCC). [Olubunmi C. Adeigbe and Ayoola Y. Jimoh : Rare Earth Elements Fingerprints: Implication For Provenance, Tectonic And Depostional Settings Of Clastic Sediments Of Lower Benue Trough, Southeastern Nigeria. N Y Sci J 2014;7(2):11-26]. (ISSN: 1554-0200). http://www.sciencepub.net/newyork. 3
s: The study areas, Lower Benue Trough is divided into Asu River Group (ARG) and Cross River Grou... more s: The study areas, Lower Benue Trough is divided into Asu River Group (ARG) and Cross River Group (CRG) and it is delimited by longitudes 7°00'E and 8°30'E and latitudes 5°00'N and 6°30'N. ARG covers Awi, Abakaliki and Mfamosing Formations while Ekenkpon, Eze-Aku, New Netim, Awgu and Agbani Formations fall within CRG. Sampling was done to cover both the Abakaliki Anticlinorium and Calabar Flank. The study aimed at using geochemical approach through rare earth elements (REE) to deduce provenance and depositional environment in a holistic manner which hitherto has not been used by any worker. A total of 56 fresh outcrop samples were obtained from the study area. The samples were subjected to detailed lithologic description by visual examination. Geochemical analysis was done using Inductively Coupled Plasma Mass Spectroscopy (ICP-MS) to determine trace and rare-earth elements using lithium metaborate/tetraborate fusion method. The chondrite normalized REE plots shows enrichment in the LREE over the HREE with negative Eu anomaly for both ARG and CRG. While the (Eu/Eu*) average for ARG and CRG are 0.74 and 0.73 respectively indicating Quartzose sedimentary, Intermediate igneous and Felsic igneous provenances for the sediments. The Cerium anomaly (Ce/Ce*) values average 1.20 and1.68 in ARG and CRG respectively indicating oxidizing and shallow marine environment. The REE pattern is consistent with that of the Upper Continental Crust (UCC). [Olubunmi C. Adeigbe and Ayoola Y. Jimoh : Rare Earth Elements Fingerprints: Implication For Provenance, Tectonic And Depostional Settings Of Clastic Sediments Of Lower Benue Trough, Southeastern Nigeria. N Y Sci J 2014;7(2):11-26]. (ISSN: 1554-0200). http://www.sciencepub.net/newyork. 3
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