滇西兰坪盆地金顶矿床闪锌矿Re-Os同位素分析数据

本数据为来自滇西兰坪盆地金顶铅锌矿床的闪锌矿Re-Os同位素定年数据，数据来源为2020YFA0714802，在国家地质实验测试中心进行分析。将选好的矿物样品经过前处理，准确称取0.65g样品粉末与185Re和190Os稀释剂共同封于卡洛斯管中，采用逆王水溶解后在230℃烘箱内加热约24小时。锇的分离采用蒸馏-微蒸馏法，铼则通过8 mol/L氢氧化钠溶液中的丙酮萃取从残余物中提取铼、锇含量及同位素组成使用Thermo Scientific Triton Plus型质谱仪在负离子检测模式下测定。对测量数据利用O同位素自然丰度和统计学中等概率模型采用逐级剥谱法进行同位素干扰扣除。 采用普通Re185Re/187Re=0.59738作为外标进行Re同位素质量分馏校正，采用192Os/188Os=3.0827作为内标迭代法对Os进行质量分馏校正。本数据可用于探索闪锌矿Re-Os 定年的可行性，从而支撑疑难矿床的高精度定年。此外，本数据可用于揭示从岩浆到不同类型热液成矿系统中的多元物质来源和巨量金属富集机制，刻画大型矿床多源物质混合过程和成矿效应。This dataset comprises Re-Os isotopic dating data of sphalerite from the Jinding Lead-Zinc Deposit in the Lanping Basin, Yunnan Province. The data originates from the project 2020YFA0714802 and was analyzed at the National Research Center for Geoanalysis. Selected mineral samples underwent pretreatment: 0.65 g of sample powder was accurately weighed together with ¹⁸⁵Re and ¹⁹⁰Os spikes, then sealed in Carius tubes. The samples were dissolved with reverse aqua regia and heated in an oven at 230 ℃ for approximately 24 hours. Osmium separation was conducted using the distillation-microdistillation method, while rhenium was extracted from the residue via acetone extraction in 8 mol/L sodium hydroxide solution. The concentrations and isotopic compositions of rhenium and osmium were measured using a Thermo Scientific Triton Plus mass spectrometer in negative ion detection mode. Isotopic interference correction was performed on the measured data through the stepwise stripping method, adopting the natural abundances of oxygen isotopes and the equal probability statistical model. Re isotopic mass fractionation correction was carried out using the conventional ¹⁸⁵Re/¹⁸⁷Re = 0.59738 as the external standard, while Os isotopic mass fractionation correction was conducted via the iterative internal standard method with ¹⁹²Os/¹⁸⁸Os = 3.0827. This dataset can be used to explore the feasibility of sphalerite Re-Os dating, thereby supporting high-precision dating of complex refractory ore deposits. Furthermore, it can be applied to reveal multiple material sources and massive metal enrichment mechanisms from magmatic to various types of hydrothermal ore-forming systems, as well as characterize multi-source material mixing processes and mineralization effects in large-scale ore deposits.

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背景概述

该数据集包含滇西兰坪盆地金顶铅锌矿床闪锌矿的Re-Os同位素分析数据，用于高精度定年和探索成矿机制。数据来源于国家重点研发计划项目，采用先进质谱技术分析，支持开放获取，旨在揭示热液成矿系统中的物质来源和金属富集过程。