尼日利亚西南部Egbetua水系沉积物地球化学特征:对物源和沉积条件的启示

S. Obaje, A. O. Pirisola
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摘要

研究区水系沉积物的物源、蚀变化学指标、元素空间分布、水流能及沉积条件。研究区位于尼日利亚西南部江户州阿科科江户地方政府区的Egbetua地区。它位于北纬07º21 ' 30 "和北纬07º22 "经度06º15 ' 30 "和东经06º17 ',平均海拔182米。本研究采用了标准的现场和实验室程序。用x射线荧光法进行地球化学分析。平均SiO2 (78.24 wt. %)、Al2O3 (12.15 wt. %)和蚀变化学指数(CIA)值为68.90%,表明烃源岩为长英质花岗质。利用Ce/Ce*、Eu/Eu*和(La/Yb)n比值推断沉积物的主要还原-氧化沉积环境。Ce/Ce*(0.80)和Eu/Eu*(0.07)分别证实了沉积环境为低流能氧化环境和长英质烃源岩氧化环境。(La/Yb)n(5.95)为低能量流的氧化环境,泥沙输入为粗粒级和粘土级。
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Geochemical characterization of Egbetua stream sediments, southwestern Nigeria: implication for provenance and depositional conditions
The aim of this work is to determine the provenance, chemical index of alteration, elemental spatial distribution in the stream sediments, stream flow energy and the depositional conditions in the study area. The study area is located in Egbetua area in Akoko Edo Local Government Area of Edo State, Southwestern Nigeria. It is located on latitudes 07º 21’30’’N and 07º 22’N longitudes 06º 15’ 30” E and 06º 17’E and average elevation of 182 metres. Standard field and laboratory procedures were used in the study. Geochemical analysis was carried out using x-ray fluorescence method. Average concentrations of SiO2 (78.24 wt. %), Al2O3 (ca. 12.15 wt. %) and the chemical index of alteration (CIA) values of 68.90% indicate felsic granitic source rocks. Ce/Ce*, Eu/Eu* and (La/Yb)n ratios were used to deduce the prevailing reducing-oxidizing depositional environment of the sediments. Ce/Ce* (0.80) confirmed an oxidizing environment of deposition with low stream flow energy, while Eu/Eu* (0.07) corroborated an oxidizing environment with felsic source rock. (La/Yb)n (5.95) indicated an oxidizing environment in a low stream energy flow with coarse-grained and clay size sediment input.
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