Petrological and Geochemical Characteristics of Pyroclastics Outcropping in Abakaliki Area Lower Benue Trough, Nigeria

Igwe E. O.

Petrological and Geochemical Characteristics of Pyroclastics Outcropping in Abakaliki Area Lower Benue Trough, Nigeria

Igwe E. O. * §

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§ Ebonyi State University, Abakaliki, Nigeria

Petrological and Geochemical Characteristics of Pyroclastics Outcropping in Abakaliki Area Lower Benue Trough, Nigeria

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Abstract

Bakaliki pyroclastics are part of the volcanoclastics of the Lower Benue Trough Nigeria. The petrological and geochemical study of the pyroclastics was carried out; to evaluate and re-appraise their petrology, stratigraphic position and origin which have remained subjects of controversy in the Benue Trough Geology. The pyroclastics outcrop as enlongate and domical bodies that are large and massive. Field relationships indicate that the volcanoclastics occur within the Abakaliki Shale of the Asu River Group and in some places they interbed with the shales. They occur mostly as agglomerates and welded tuffs cut by several quartz filled veins and segregations. The agglomerates are porphyritic with angular fragments of shales embedded in them. The tuffs are very fine grained and aphanitic in texture. Petrographic data obtained from this study show plagioclase and augite as the major mineral constituents with quartz, olivine, calcite and iron oxide as the accessories. Devitrified glass shards are common in the rocks. They are of basaltic composition. Geochemical analysis shows that the pyroclastics are subakaline, tholeiitic rocks of thin continental crust origin. They are classified as basalts, basaltic andesites, dacites and rhyolites.

References

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Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

How to Cite This Article

Igwe E. O.. 2013. "Petrological and Geochemical Characteristics of Pyroclastics Outcropping in Abakaliki Area Lower Benue Trough, Nigeria". Global Journal of Science Frontier Research - H: Environment & Environmental geology GJSFR-H Volume 13 (GJSFR Volume 13 Issue H3).

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GJSFR Volume 13 Issue H3

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Journal Specifications

Crossref Journal DOI 10.17406/GJSFR

Print ISSN 0975-5896

e-ISSN 2249-4626

Keywords

abakaliki pyroclastics benue trough geochemistry petrography

Classification

GJSFR-H Classification FOR Code: 969999

040299

Submission ReceivedJuly 11, 2013
Peer Review Double Blind
Handling Editor
Accepted August 7, 2013
Published August 21, 2013

Version of record

v1.2

Issue date

September 18, 2013

Language

English

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Total Score: 147

Country: Nigeria

Subject: Global Journal of Science Frontier Research

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

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