陕西铁岔沟磁铁矿及钛铁矿主微量元素数据集

该数据集包含陕西铁岔沟碳酸岩相关铁矿床的磁铁矿及钛铁矿的微区原位主量元素和微量元素组成，实验分析分别在中国地质大学（武汉）地质过程与成矿预测全国重点实验室采用电子探针及激光剥蚀电感耦合等离子体质谱获得，对主量元素含量，样品测试条件为加速电压 15 kV，加速电流 20 nA，束斑直径 1μm。Fe和Ti元素特征峰的测量时间为10s；Mg，Mn，Al，Ca， Cr和V元素特征峰的测量时间为20s，上下背景的测量时间分别是峰测量时间的一半。测试元素所用的标样为镁铝榴石(Fe)，硫铁矿（Al）、透辉石（Ca, Mg）、菱铁矿（Mn）、金红石（Ti）、赤铁矿（Fe）、铬（Cr）和钒(V)。对微量元素含量，采用33 μm光斑、10 Hz重复频率和3-5 J/cm²能量密度。每个点分析包括30秒背景数据采集和40秒样品数据采集。本研究采用多种参考材料（NIST 610和612、BIR-1G、BCR-2G和BHVO-2G）作为外部标准，无需内标即可确定未知元素浓度。分析不确定度估计为大多数微量元素优于10%，稀土元素（REE）优于5%。该项目通过对铁岔沟碳酸岩伴生铁矿床中不同磁铁矿和钛铁矿的矿物结构和原位地球化学组成的研究，探讨了铁岔沟碳酸岩伴生铁矿床中铁钛氧化物的成因，这项研究将有助于了解碳酸岩和其他环境中铁钛氧化物的形成历史。

This dataset presents in-situ major and trace element compositions of magnetite and ilmenite from the carbonatite-associated iron deposit in Tiechagou, Shaanxi Province, China. All experimental analyses were conducted at the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan), using electron probe microanalysis (EPMA) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). For major element analyses, the test conditions were: accelerating voltage of 15 kV, accelerating current of 20 nA, and beam spot diameter of 1 μm. The counting time for characteristic peaks of Fe and Ti was 10 s, while that for Mg, Mn, Al, Ca, Cr and V was 20 s. The counting time for both upper and lower backgrounds was half of the peak counting time. The reference materials used for calibration are as follows: pyrope for Fe, pyrite for Al, diopside for Ca and Mg, siderite for Mn, rutile for Ti, hematite for Fe, chromium metal for Cr, and vanadium metal for V. For trace element analyses, a 33 μm beam spot, 10 Hz repetition rate and energy density of 3–5 J/cm² were adopted. Each analytical spot included 30 s of background data acquisition and 40 s of sample data acquisition. In this study, multiple reference materials (NIST 610, NIST 612, BIR-1G, BCR-2G and BHVO-2G) were used as external standards, enabling the determination of unknown element concentrations without internal standards. The analytical uncertainty was estimated to be better than 10% for most trace elements and better than 5% for rare earth elements (REEs). This study investigated the genesis of iron-titanium oxides in the Tiechagou carbonatite-associated iron deposit by examining the mineral structures and in-situ geochemical compositions of different magnetite and ilmenite samples from the deposit. This research will contribute to understanding the formation histories of iron-titanium oxides in carbonatites and other geological settings.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于陕西铁岔沟碳酸岩相关铁矿床，提供了磁铁矿和钛铁矿的微区原位主量元素与微量元素组成数据，实验分析采用电子探针和激光剥蚀电感耦合等离子体质谱技术，确保高精度测量。数据集旨在通过矿物结构和地球化学研究，探讨铁钛氧化物的成因，为理解碳酸岩等环境中矿物形成历史提供科学依据。