We present an analytical protocol for in situ U–Pb isotope dating of wolframite series minerals [(Fe,Mn)WO₄], the main ore mineral for tungsten, by LA-SF-ICP-MS. Precision and accuracy of the protocol was intensively assessed using our newly developed well-characterized U–Pb wolframite reference material. The tungsten oxide interference on Hg and Pb was investigated in detail. The matrix effect between ferberite and hübnerite during laser ablation was thoroughly examined for wolframite series minerals with a different Mn/(Mn + Fe) ratio. The closure temperature of wolframite, with respect to the U–Pb system, was evaluated. The application of eleven wolframite samples, with ages from ∼1780 Ma to ∼26 Ma, robustly demonstrated the feasibility of our approach. Most studied wolframite series minerals yielded U–Pb concordant or subconcordant ages. Samples with a relatively high U content and negligible common Pb content typically had a ²⁰⁶Pb/²³⁸U age precision of ca. 1%. The new in situ data agree well with published cassiterite or wolframite ages from the same locations. LA-SF-ICP-MS, with the advantages of high sensitivity, rapidity, and relatively low cost, as well as moderate spatial resolution (i.e., 32 or 44 μm) that is sufficiently high to avoid sulfide inclusions, is the method of choice for in situ wolframite U–Pb microanalysis.

中文翻译：

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通过LA-SF-ICP-MS对黑钨矿系列矿物进行准确，准确的原位U-Pb同位素测年

我们提出了黑钨矿系列矿物[（Fe，Mn）WO _4的原位U–Pb同位素定年的分析方案LA-SF-ICP-MS法测定钨的主要矿石。使用我们新开发的特性良好的U–Pb黑钨矿参考材料，对协议的准确性和准确性进行了深入评估。详细研究了氧化钨对Hg和Pb的干扰。对于具有不同Mn /（Mn + Fe）比的黑钨矿系列矿物，已彻底检查了激光烧蚀过程中的辉铁矿与堇青石之间的基体效应。相对于U–Pb系统，评估了黑钨矿的关闭温度。年龄从1780 Ma到26 Ma的11个黑钨矿样品的应用有力地证明了我们方法的可行性。大多数研究的黑钨矿系列矿物产生的U–Pb年龄一致或次一致。U含量相对较高且普通Pb含量可忽略不计的样品通常具有²⁰⁶的Pb / ²³⁸的ü年龄精度约 1％新的原位数据与来自同一地点的已发布锡石或黑钨矿年龄非常吻合。选择LA-SF-ICP-MS具有高灵敏度，快速性和相对较低的成本以及适中的空间分辨率（即32或44μm）足以避免硫化物夹杂的优点。用于原位黑钨矿U–Pb微量分析。