Mahmoud A. Galmed, Hisham A. Gahlan, Habes A. Ghrefat, Essam A. Mohamed, Khaled M. Al Kahtany
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Mineralogical investigations indicate that the primary mineral composition of the bauxite includes gibbsite, boehmite, diaspore (kaolinite), hematite, quartz, and calcite. XRF showed that the dominant chemical components of the bauxite samples are Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, and Fe<sub>2</sub>O<sub>3</sub>. When considering the collective data from the rare earth elements (REEs) analysis (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) and chemical weathering indices such as the Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), and Weathering Index of Parker (WIP), it becomes evident that the Az Zabirah South Zone bauxite laterite profile at Al Ba’itha mine was formed under the influence of significant and persistent weathering conditions. 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引用次数: 0
摘要
对沙特阿拉伯中北部 Az Zabirah 地区白垩纪铝土剖面矿床的露头样本进行了全面评估,旨在利用 X 射线衍射分析 (XRD)、扫描电子显微镜 (SEM) 结合能量色散 (EDS) 分析以及 X 射线荧光光谱仪 (XRF) 分析,研究其岩石学和地球化学特征。Az Zabirah 地区的这些铝土矿藏包括三个主要区域:南区、中区和北区。从岩石学角度来看,铝土矿样本主要由鲕粒到鲕粒组成,这些鲕粒被由铝土矿材料、氧化铁、方解石和/或高岭石组成的基质结合在一起。矿物学研究表明,铝土矿的主要矿物成分包括辉绿岩、波长石、透辉石(高岭石)、赤铁矿、石英和方解石。XRF 显示,铝土矿样品的主要化学成分是 Al2O3、SiO2 和 Fe2O3。在考虑稀土元素(REEs)分析(La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb 和 Lu)和化学风化指数(如化学蜕变指数(CIA))的综合数据时,需要考虑以下因素:(a) 铝土矿样品的化学成分;(b) 铝土矿样品的化学成分;(c) 铝土矿样品的化学成分、根据这些指数,可以明显看出 Al Ba'itha 矿区 Az Zabirah 南区红土铝土矿剖面是在显著而持久的风化条件影响下形成的。本研究的发现和使用的方法被认为是有益和有价值的,因为它们有助于在干旱和半干旱环境中进行矿产勘探。
Petrology and geochemistry of the Az Zabirah south zone bauxite deposit at Al Ba’itha mine, north-central Saudi Arabia
In the central north of Saudi Arabia, outcrop samples from the Cretaceous bauxite profile deposits in the Az Zabirah area were subjected to a comprehensive evaluation aimed at investigating their petrographical and geochemical characteristics using X-ray diffraction analysis (XRD), Scanning electron microscope (SEM) coupled with Energy dispersive (EDS) analysis, and X-ray fluorescence spectrometer (XRF) analysis. These bauxite deposits in the Az Zabirah area comprises of three main zones: the South zone, the Central zone, and the North zone. Petrologically, the bauxite samples predominantly consist of oolitic to pisolitic grains that are bound together by a matrix comprising bauxitic materials, iron oxides, calcite, and/or kaolinite. Mineralogical investigations indicate that the primary mineral composition of the bauxite includes gibbsite, boehmite, diaspore (kaolinite), hematite, quartz, and calcite. XRF showed that the dominant chemical components of the bauxite samples are Al2O3, SiO2, and Fe2O3. When considering the collective data from the rare earth elements (REEs) analysis (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) and chemical weathering indices such as the Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), and Weathering Index of Parker (WIP), it becomes evident that the Az Zabirah South Zone bauxite laterite profile at Al Ba’itha mine was formed under the influence of significant and persistent weathering conditions. The findings and methods used in this study are considered beneficial and valuable as they support mineral exploration in arid and semi-arid environments.
期刊介绍:
Geosciences Journal opens a new era for the publication of geoscientific research articles in English, covering geology, geophysics, geochemistry, paleontology, structural geology, mineralogy, petrology, stratigraphy, sedimentology, environmental geology, economic geology, petroleum geology, hydrogeology, remote sensing and planetary geology.