Use of Statistical Parameters in the Sedimentological Study of Conglomerate Deposits in Northeastern Part of Akwa Ibom State, Niger Delta Basin, Nigeria

I. Udo
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Abstract

Conglomerates and pebbly sandstone abound along a belt of about 50km long and 11km wide in northeastern part of Akwa Ibom State. Granulometric analysis of 29 samples show the deposits to be poorly to moderately sorted, having sorting coefficient values ranging between 0.63ф to 1.41ф. Pebble morphometric analysis of the conglomerates showed that the mean values of the various morphometric parameters range as follows: flatness ratio (S/L = 0.39-0.58), elongation ratio (I/L =0.64-0.78), maximum projection sphericity (Ψ P = 0.60-0.77), Oblate Prolate index (Ō P = -1.98 to 4.13), coefficient of flatness (39.25-57.86). Roundness index determined for the pebbles through simple comparism with Power’s (1953) roundness chart averaged 0.232. Interpretation of pebble morphometric and granulometric results indicate a fluvial environment of deposition for the deposits.
统计参数在尼日利亚尼日尔三角洲盆地阿夸伊博姆州东北部砾岩沉积学研究中的应用
阿夸伊博姆州东北部一条长约50公里、宽约11公里的带状地带盛产砾岩和含砾砂岩。29个样品的粒度分析表明,分选系数在0.63 ~ 1.41之间,分选差至中等。砾岩卵石形态测量结果表明,各形态测量参数的平均值分别为:平坦度比(S/L = 0.39 ~ 0.58)、延伸率比(I/L =0.64 ~ 0.78)、最大投影球度(Ψ P = 0.60 ~ 0.77)、扁长指数(Ō P = -1.98 ~ 4.13)、平坦度系数(39.25 ~ 57.86)。通过与Power(1953)圆度图的简单比较,确定的鹅卵石圆度指数平均为0.232。砾石形态和粒度分析结果表明该矿床为河流沉积环境。
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