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首页> 外文期刊>Contributions to Mineralogy and Petrology >Composition and origin of fluids associated with lode gold deposits in a Mesoarchean greenstone belt (Warrawoona Syncline, Pilbara Craton, Western Australia) using synchrotron radiation X-ray fluorescence
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Composition and origin of fluids associated with lode gold deposits in a Mesoarchean greenstone belt (Warrawoona Syncline, Pilbara Craton, Western Australia) using synchrotron radiation X-ray fluorescence

机译：使用同步加速器辐射X射线荧光分析与Mesoarchean绿岩带（Warrawoona Syncline，Pilbara Craton，西澳大利亚）中的金矿床有关的流体的成分和起源

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Microthermometry and Raman spectros-copy techniques are routinely use to constrain ore-fluids (delta~(18)O and molar proportions of anhydrous gas species (CO_2, CH_4, N_2). However, these methods remain imprecise concerning the ore-fluids composition and source. Synchrotron radiation X-ray fluorescence allows access to major and trace element concentrations (Cl, Br and K, Ca, Fe, Cu, Zn, As, Rb, Sr) of single fluid inclusion. In this paper, we present the results of the combination of these routine and newly developed techniques in order to document the fluids composition and source associated with a Mesoarchaean lode gold deposit (Warrawoona Syncline, Western Australia). Fluid inclusion analyses show that quartz veins preserved records of three fluid inclusion populations. Early fluids inclusions, related to quartz veins precipitation, are characterized by a moderate to high Br/Cl ratio relative to modern seawater, CO_2 + - CH_4 + - N_2, low to moderate salinities and significant base metal (Fe, Cu, Zn) and metalloid (As) concentrations. Late fluid inclusions trapped in secondary aqueous fluid inclusions are divided into two populations with distinct compositions. The first population consists of moderately saline aqueous brines, with a Br/Cl ratio close to modern seawater and a low concentration of base metals and metalloids. The second population is a fluid of low to moderate salinity, with a low Br/Cl ratio relative to modern seawater and significant enrichment in Fe, Zn, Sr and Rb. These three fluid inclusion populations point to three contrasting sources: (1) a carbonic fluid of mixed metamorphic and magmatic origin associated with the gold-bearing quartz precipitation; (2) a secondary aqueous fluid with seawater affinity; and (3) a surface-derived secondary aqueous fluid modified through interaction with felsic litholo-gies, before being flushed into the syncline. Primary carbonic fluids present similar characteristics than those ascribed to Mesoarchaean lode gold deposits. This suggests similar mineralization processes for mid- and Mesoarchaean lode gold deposits despite contrasting fluid-rock interaction histories. However, in regard to the protracted history documented in the Warrawoona Syncline, we question the robustness of the epigenetic crustal continuum model, as ore-fluid characteristics equally support an epigenetic or a polyphased mineralization process.
机译：通常使用显微热分析和拉曼光谱技术来限制矿液（δ〜（18）O和无水气体种类的摩尔比（CO_2，CH_4，N_2），但是这些方法对于矿液的成分和同步辐射X射线荧光使单个流体夹杂物的主要和痕量元素浓度（Cl，Br和K，Ca，Fe，Cu，Zn，As，Rb，Sr）得以访问。这些常规技术和最新开发技术的结合，以记录与美苏拉奇矿体金矿床有关的流体成分和来源（Warrawoona Syncline，西澳大利亚）流体包裹体分析表明石英脉保存了三个流体包裹体种群的记录。与石英脉降水有关的流体包裹体的特征是：相对于现代海水而言，Br / Cl比为中到高，CO_2 +-CH_4 +-N_2，盐度为中低，并且碱含量较高金属（Fe，Cu，Zn）和准金属（As）的浓度。滞留在次级含水流体包裹体中的晚期流体包裹体被分成具有不同成分的两个种群。第一类人群是中度盐水的盐水，其Br / Cl比值接近现代海水，并且贱金属和准金属的浓度低。第二类是低盐度至中度盐度的流体，相对于现代海水而言，Br / Cl比率低，并且Fe，Zn，Sr和Rb明显富集。这三个流体包裹体种群指向三个相反的来源：（1）与含金石英沉淀有关的混合变质和岩浆成因的碳流体; （2）具有海水亲和力的二次水性流体; （3）在冲刷成向斜前，通过与长石版岩作用相互作用而改性的表面衍生的二次水流体。初级碳流体具有与归因于Mesoarchaean矿床金矿床相似的特征。这表明尽管流体-岩石相互作用的历史不同，但中古生代和中古生代金矿床的矿化过程相似。但是，关于Warrawoona Syncline中记录的长期历史，我们质疑表观成因地壳连续体模型的鲁棒性，因为矿液特征同样支持表观成因或多相成矿作用。

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