Paleoclimate Reconstruction during Mamu Formations (Cretaceous) Based on Clay Mineral Distribution in Northern Anambra Basin, Nigeria

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Author(s) Sunday Ojochogwu Idakwo | Gideon Yomi Barnabas | Shade Tope Alege | Korede Emmanuel Alege
Pages 879-885
Volume 2
Issue 12
Date December, 2013
Keywords Palaeoclimate, XRD, Northern Anambra Basin, Clay minerals.
Abstract

Paleoclimate was reconstructed by the clay mineral assemblage of clay units in Mamu formation of Northern Anambra Basin. Collected samples were prepared using standard clay mineral methodology. Their identification was made on X-ray diffractographs, the results show that the clay mineral is predominantly kaolinitic with a percentage abundance of about 28.75%, its variation style in different locations could be a marker of climate change from wet to dry which is supported by lithological changes. The high dominance of quartz with percentage abundance of 67% confirms the grittiness of the clay. Microcline constituents about 5- 10% confirming the clay as a product of weathering from granitic rock possible from the Precambrian basement rock units of Adamawa- Oban massif areas to the east of the Anambra Basin and the adjacent Abakaliki Anticlinorium. With the absence of illite, Smectite, montmorillonite which are characteristics of dry and arid climate confirms a wet/tropical climate for the clay deposit in the Northern Anambra Basin and thus, the present results can be indicated as a possible procedure for ancient climate changes evaluation.

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