One of the requirements for inferring mantle redox states via zircon Ce/Ce* oxybarometry and Ti‐in‐zircon thermometry is to select mantle‐equilibrated zircon derived from melts that have not interacted with the hydrosphere nor assimilated exogenous materials. Traditional protocols for identifying mantle‐equilibrated zircon require a comprehensive examination of whole rock geochemistry in addition to zircon morphology, texture, and trace element and isotopic measurements. This study proposes a simple filter scheme for selecting mantle‐equilibrated zircon using trace element systematics alone (P, Ti, Y, Nb, rare earth elements [REE], Hf, Th, and U) to provide the geological context of zircon from three perspectives: (1) mineral inclusions; (2) source melt petrogenesis; and (3) zircon saturation context. The filter scheme presented here, comprising of 13 criteria, is established based on detailed classifications of 2,173 zircon analyses from 30 independent references and is shown to distinguish between nonmagmatic zircon, magmatic zircon with significant inclusions and/or sourced from highly enriched source melts, and mantle‐equilibrated zircon. The filter scheme is validated with known, well‐characterized mantle‐equilibrated Jack Hills zircon (n = 53) and derives an average mantle redox state of (sd) circa 4,400 Ma, in agreement with previously published results. Further application of the filter scheme to zircon dataset (n = 76) from three metasedimentary rocks successfully reveals the mantle‐equilibrated zircon in the dataset, and implies a mantle redox state of (sd) circa 2,950 Ma. This filter scheme can be applied to studies of out‐of‐context detrital and/or xenocrystic zircon in the future.

中文翻译：

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微量元素化学鉴定地幔平衡锆石的新方法

通过锆石Ce / Ce *氧压法和Ti-in-zircon测温法推断地幔氧化还原状态的要求之一是，选择不与水圈相互作用或未吸收外源物质的熔体衍生的经地幔平衡的锆石。识别地幔平衡的锆石的传统协议除了锆石形态，质地，微量元素和同位素测量外，还需要对整个岩石地球化学进行全面检查。这项研究提出了一种简单的过滤方案，仅使用痕量元素系统（P，Ti，Y，Nb，稀土元素[REE]，Hf，Th和U）来选择地幔平衡的锆石，以提供三种锆石的地质背景。观点：（1）矿物包裹体；（2）源熔岩成因；（3）锆石饱和度背景。这里介绍的过滤方案 该模型基于13个标准，由30个独立参考文献对2,173个锆石分析的详细分类建立，并显示出可区分非岩浆锆石，含大量夹杂物和/或来源于高度富集的源熔岩的岩浆锆石和地幔平衡的锆石。该过滤器方案已通过已知且特征明确的地幔平衡Jack Hills锆石（n  = 53），并推导出平均地幔氧化还原状态（sd）约为4,400 Ma，与先前发表的结果一致。进一步将过滤方案应用于来自三个准沉积岩的锆石数据集（n  = 76）成功地揭示了数据集中地幔平衡的锆石，并暗示了（sd）约2950 Ma的地幔氧化还原状态。该过滤器方案将来可用于研究上下文外碎屑和/或异晶锆石。