LA-ICP-MS analysis of molybdenite from the Sar Cheshmeh porphyry Cu-Mo deposit (PCD), Iran, shows moderate concentration of Re (average ∼207 ppm) and low concentration of chalcogenides (average of Pb + Te + Bi, ∼31 ppm) as well as metalloids (average of As + Sb + Ge, ∼4.5 ppm). The early-formed quartz–molybdenites associated with potassic alteration are characterized by moderately low concentration of Re (21–215 ppm with an average of 83 ppm), whereas the transitional quartz–molybdenite veins related to the sericitic stage of mineralization contain more Re (62–465 ppm, with an average of 207 ppm). In contrast, the late-formed quartz–molybdenite veins associated with phyllic alteration show the highest concentration of Re (up to 1273 ppm with an average of 395 ppm). Gradual increase in Re content of molybdenites deposited throughout the evolution of the porphyry system is probably related to elevated ƒO₂ and acidic conditions of the ore fluids governing the transitional and late stage of mineralization, when compared to the moderately low ƒO₂ and basic conditions of the ore fluids precipitating the low-Re molybdenites associated with potassic alteration. The mixed mantle/crustal source of the ore-related magma and its fractionated composition in Sar Cheshmeh are consistent with magmatic conditions for the formation of Mo-rich and Re-poor PCDs in the world.

中文翻译：

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伊朗 Sar Cheshmeh 斑岩铜钼矿床辉钼矿中铼和其他微量元素的地球化学

来自伊朗 Sar Cheshmeh 斑岩铜钼矿床 (PCD) 的辉钼矿的 LA-ICP-MS 分析显示中等浓度的 Re（平均约 207 ppm）和低浓度的硫属化物（平均 Pb + Te + Bi，约 31 ppm）以及准金属（As + Sb + Ge 的平均值，~4.5 ppm）。与钾化蚀变相关的早成石英-辉钼矿的特征是Re浓度适中（21-215 ppm，平均为83 ppm），而与绢云母矿化阶段相关的过渡石英-辉钼矿脉含有更多的Re（ 62–465 ppm，平均为 207 ppm）。相比之下，与叶状蚀变相关的晚期形成的石英-辉钼矿脉显示出最高的 Re 浓度（高达 1273 ppm，平均为 395 ppm）。₂和控制矿化过渡和晚期阶段的矿流体的酸性条件，与中等低的 ƒO ₂和与钾蚀变相关的低 Re 辉钼矿沉淀的矿流体的碱性条件相比。Sar Cheshmeh 中与矿石有关的岩浆的混合地幔/地壳来源及其分馏成分与世界上形成富钼和贫稀土 PCD 的岩浆条件一致。