Images and laser ablation ICPMS data for Fe-Ni-Cu sulfides from Cabo Ortegal, northern Spain (NERC Grant NE/P017312/1)

Samples are dunites, harzburgites and pyroxenites with variable proportions of chromite from the Cabo Ortegal collection of the late Prof Hazel Prichard, that is held at Cardiff University. Data were acquired during 2021 and 2022. Folders include: reflected light microscopy images of various sulfide minerals and mineral textures in thin section; element maps and backscattered electron images of areas and selected complete thin sections; and metadata (time-resolved analysis spectral data) for laser ablation ICP-MS analysis of sulfide minerals. Petrographic assessment by element mapping used a Zeiss Sigma HD Field Emission Gun Analytical Scanning Electron Microscope (A-SEM) equipped with two Oxford Instruments 150 mm2 Energy Dispersive X-ray Spectrometry (EDS) detectors at the School of Earth and Environmental Sciences, Cardiff University. Operating conditions were set at 20kV and aperture size to 120 µm, with a nominal beam current of 4 nA and working distance of 8.9 mm. Using Aztec software, maps were acquired at 100 to 150 x magnifications, with resulting pixel sizes ranging from 10 to 22 µm, depending on the resolution of acquired spectral images. Laser-ablation ICPMS analyses were performed using a ESI UP213 laser system coupled to a Thermo iCAPRQ ICP-MS system at the School of Earth and Environmental Sciences, Cardiff University. The data were gathered to understand the concentrations of precious and semi-metal trace elements and their likely mineral forms in the various Fe-Ni-Cu sulfide minerals.本数据集的样品为卡迪夫大学馆藏的已故黑兹尔·普里查德（Hazel Prichard）教授奥尔特加角（Cabo Ortegal）收藏系列中的纯橄榄岩、方辉橄榄岩与辉石岩，样品含不同比例的铬铁矿。数据采集于2021年至2022年间。 数据集文件夹包含以下内容：各类硫化物矿物的反光显微成像图及薄片中矿物结构图像；目标区域及选定完整薄片的元素分布图与背散射电子图像；硫化物矿物激光剥蚀电感耦合等离子体质谱（laser ablation ICP-MS）分析的元数据（即时间分辨分析光谱数据）。 岩相学元素映射表征实验于卡迪夫大学地球与环境科学学院完成，所用设备为蔡司（Zeiss）Sigma HD场发射枪分析型扫描电子显微镜（A-SEM），该设备搭载两台牛津仪器（Oxford Instruments）150 mm²能量色散X射线光谱（EDS）探测器。实验操作参数设置为：加速电压20kV，光阑尺寸120 µm，标称束流4 nA，工作距离8.9 mm。实验采用Aztec软件进行数据采集，成像放大倍率设置为100~150倍，所得像素尺寸介于10~22 µm之间，具体取值取决于采集的光谱图像分辨率。 激光剥蚀电感耦合等离子体质谱分析同样于卡迪夫大学地球与环境科学学院完成，所用设备为ESI UP213激光剥蚀系统与赛默飞（Thermo）iCAP RQ型电感耦合等离子体质谱仪的联用装置。本数据集采集的目的在于解析各类铁-镍-铜硫化物矿物中贵金属与半金属微量元素的含量及其赋存矿物相。