Grain texture and morphology datasets for the northern Anambra Basin, Nigeria

This dataset contains the raw and processed analytical data supporting the study of the Campano-Maastrichtian Mamu and Ajali Formations in the northern Anambra Basin, Nigeria. The study integrates traditional granulometric analysis with high-resolution Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), and Principal Component Analysis (PCA) to refine paleoenvironmental reconstructions. The repository includes the following four components: 11. Excel/CSV sheets containing raw sieving data and cumulative frequency distribution values for 17 representative samples (sandstones, siltstones, and ironstones) from the Odagbo, Egume, and Iyale sections. 22. A comprehensive table of calculated textural parameters based on the Folk and Ward (1957) graphical method, including Graphic Mean (MZ), Inclusive Graphic Standard Deviation (σI), Skewness (SkI), and Kurtosis (KG). 33. Elemental weight percentages (Si, Al, Fe, C, O) obtained from point-analyses on individual quartz grains and diagenetic phases via SEM-EDX. 4. The Python script (compatible with Google Colab/Jupyter) used to perform the Principal Component Analysis.本数据集包含支撑尼日利亚阿南布拉盆地北部坎潘-马斯特里赫特阶（Campano-Maastrichtian）Mamu组与阿贾利组（Ajali Formations）研究所需的原始与经处理分析数据。本研究将传统粒度分析与高分辨率扫描电子显微镜（Scanning Electron Microscopy, SEM）、能量色散X射线能谱（Energy Dispersive X-ray Spectroscopy, EDX）以及主成分分析（Principal Component Analysis, PCA）相结合，以完善古环境重建工作。 本数据集存储库包含以下四个组成部分： 11. 包含采自Odagbo、Egume及Iyale剖面的17件代表性样品（砂岩、粉砂岩与铁矿石）的原始筛分数据与累积频率分布值的Excel/CSV工作表。 22. 基于福克与沃德（Folk and Ward, 1957）图解法计算得到的完整结构参数表，涵盖图解平均值（Graphic Mean, MZ）、包容图解标准偏差（Inclusive Graphic Standard Deviation, σI）、偏度（Skewness, SkI）以及峰度（Kurtosis, KG）。 33. 通过SEM-EDX对单个石英颗粒及成岩相开展点分析得到的元素质量百分比（Si、Al、Fe、C、O）。 4. 用于执行主成分分析的Python脚本（兼容Google Colab/Jupyter环境）。