GEOCHEMICAL ANALYSIS AND PETROGRAPHIC STUDIES OF MAJOR AND TRACE ELEMENTS ANALYSIS OF LIMESTONE IN OGU AND OBOTME COMMUNITIES IN INI LOCAL GOVERNMENT AREA, AKWA IBOM STATE
Abstract
ABSTRACT
The comprehensive laboratory analysis of the limestone sample in Obotme community has revealed a diverse array of compositional parameters, each shedding light on the intricate nature of some major elements in the limestone sample. The analysis has also unveiled trace elements like Strontium (Sr) at 231.016 mg/l, barium (Ba) at 26.182 mg/l, boron (B) at less than 0.001 mg/l, vanadium (V) at 516.103 mg/l, nickel (Ni) at 362.216 mg/l, and rubidium (Rb) at 6.529 mg/l which contributes to the overall tapestry of the limestone's composition. It has revealed its environment of deposition, paleoclimate, paleosalinity. In humid climate, cointents of Fe, Mn, V, Cr, Co, Ni, and other elements in sedimentary rock is relatively high. Whereas contents of ca, Sr, Ba etc are high in dry climatic conditions. The smaller the value of these elements, the more humid the climate. V and Ni values of 516.103mg/l and 362.216mg/l indicate a high inferring humid climate. The relatively lower value of Sr (231.016mg/l and Ba (26.182mg/l) also indicate humid climate. In paleoclimate- Al2O3/MgO = 4.83/0.75 = 6.44% represent a warm humid climate. In paleoweathering, the concentration of Fe2O3/FeO 3.16/0.52=6. The RR ratio of the analyzed sample corresponds to a medium level of chemical weathering. Microfacies analysis was also carried out on limestone deposits within Obotme in Ini Local Government Area, South-eastern Nigeria to identify the different microfacies of limestone in the study area. Field work and laboratory techniques employed in the preparation of the limestone thin sections are standard methods as used in limestone petrography
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