Provenance and paleoenvironmental studies of Bima and Dukul Formations in the Yola Basin, Northern Benue Trough, Nigeria.

Scientia Africana Pub Date : 2024-05-14 DOI:10.4314/sa.v23i2.14

G. Ochu, H.E. Ibrahim, D.A. Adesina, F. Abubakar, O.T. Ijaleye, J.A. Usman, A.O. Danga, S.O. Ibrahim

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Abstract

Sedimentological studies of some areas located within latitudes 11035’E & 12000’E, and longitudes 9014’N & 9025’N were undertaken to delineate the surface lithologies of the Yola sub-basin, in the Northern Benue Trough. Field observations of the surficial deposits at Mayolope, Taana, Kpasam and Bille revealed that they are Bima Formation while the ones in Abare are Dukul Formation. Paleoenvironmental studies based on the characteristics of lithofacies of these exposed sections and laboratory assessments of some selected samples showed that the Bima Formation was deposited in a continental setting while the Dukul Formation was deposited in a low-energy marine setting. Petrographic studies of framework components showed that the samples of the Bima Formation were predominated by quartz minerals, leading to their identifications as sandstones and classifications as quartzarenites while the samples of the Dukul Formation were limestones and were classified as bioclastic packstones. Heavy mineral compositions of the sandstones revealed their provenance; Zircon and Tourmaline with a combined amount of 60.1% suggested igneous and low-grade metamorphic rocks while rutile and staurolite with a total amount of 27.7% indicated contributions from high-grade metamorphic rocks.

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尼日利亚贝努埃海槽北部约拉盆地 Bima 和 Dukul 地层的成因和古环境研究。

对位于东经 11035 英尺和 12000 英尺、北纬 9014 英尺和 9025 英尺的一些地区进行了沉积学研究，以确定北贝努埃海槽约拉次盆地的地表岩性。对 Mayolope、Taana、Kpasam 和 Bille 的地表沉积物进行的实地观察显示，这些沉积物属于 Bima Formation（比马地层），而 Abare 的沉积物属于 Dukul Formation（杜库尔地层）。根据这些出露地段的岩相特征进行的古环境研究以及对一些选定样本进行的实验室评估表明，比马地层是在大陆环境中沉积的，而杜库尔地层是在低能量海洋环境中沉积的。框架成分的岩相学研究表明，比马地层的样本以石英矿物为主，因此被确定为砂岩，并被归类为石英岩，而杜库尔地层的样本则为灰岩，被归类为生物碎屑岩。砂岩的重矿物成分显示了它们的产地；锆石和电气石的总含量为 60.1%，表明是火成岩和低级变质岩，而金红石和白云石的总含量为 27.7%，表明是高级变质岩。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Scientia Africana

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