Provenance and Tectonic Setting of Amasiri Sandstone (Turonian) in Ugep Area, Southern Benue Trough, Nigeria: Evidences from Petrography and Geochemistry

Provenance and Tectonic Setting of Amasiri Sandstone (Turonian) in Ugep Area, Southern Benue Trough, Nigeria: Evidences from Petrography and Geochemistry

Igwe E. O.

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Amoke G. U.

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Ngwu C. N.

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α Ebonyi State University

Provenance and Tectonic Setting of Amasiri Sandstone (Turonian) in Ugep Area, Southern Benue Trough, Nigeria: Evidences from Petrography and Geochemistry

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Abstract

The petrographic and geochemical study of sandstones of Eze-Aku Formation (Turonian) outcropping in Ugep area southern Benue Trough Nigeria was carried out to ascertain the sandstone provenance and tectonic setting. Field studies show that the sandones occur in linear, parallel northeastsouthwest trending ridges alternating with shale sequence. The sandstone facies show coarsening upward sequence, slightly bioturbated, cross-stratified, rippled bedded which infer foreshore to shallow marine below wave base. Petrographic studies show the occurrence of quartz, feldspar, rock fragments and muscovite. The calculated framework grains suggest feldsparthic (subarkosic) sandstone. The geochemical analysis of the major elements of the sandstones show that they are enriched in SiO2, TiO2, Al2O3 and Fe2O3 and depleted in K2O, Na2O, MgO and CaO. Tectonic setting discrimination plot diagrams based on major elements suggest the provenance for the sandstones to be of metamorphic and igneous rocks of Passive Continental Margin Basin. The results of petrographic and geochemical study suggest Oban Massif and Cameroon Basement as the source regions for the sandstone which are characterized by humid climate and low-relief during the Turonian.

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No external funding was declared for this work.

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The authors declare no conflict of interest.

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How to Cite This Article

Igwe E. O.. 2013. \u201cProvenance and Tectonic Setting of Amasiri Sandstone (Turonian) in Ugep Area, Southern Benue Trough, Nigeria: Evidences from Petrography and Geochemistry\u201d. Global Journal of Science Frontier Research - H: Environment & Environmental geology GJSFR-H Volume 13 (GJSFR Volume 13 Issue H2): .

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GJSFR Volume 13 Issue H2
Pg. 33- 40

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Journal Specifications

Crossref Journal DOI 10.17406/GJSFR

Print ISSN 0975-5896

e-ISSN 2249-4626

Keywords

eze-aku formation geochemistry petrography provenance sandstones

Submission ReceivedJune 26, 2013
Peer Review Double Blind
Handling Editor
Accepted July 17, 2013
Published July 29, 2013

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August 3, 2013

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Article Matrices

Total Score: 103

Country: Nigeria

Subject: Global Journal of Science Frontier Research - H: Environment & Environmental geology

Authors: Igwe E. O., Amoke G. U., Ngwu C. N. (PhD/Dr. count: 0)

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