Abstract The Biga Peninsula (northwest Anatolia) hosts several Pb–Zn occurrences, and the Dursunbey Pb–Zn deposit is one such important Pb–Zn province of Turkey. The basement rocks in the study area comprise metamorphic rocks of the Menderes Massif (Simav Metamorphites, Saricasu Formation, and Budagan Limestone) and ophiolitic units of the Izmir-Ankara Suture Zone, known as the Dagardi Melange. These units were intruded by the Miocene Alacam granite. Cover units start with the Early Miocene Yenikoy Formation (comprising alternating sandstone, claystone, marl, and clayey limestone, and tuff additives) and are terminated by Civanadag tuffs, Akdag volcanics, and the Toklargolu Formation, consisting of unattached grains and alluvium deposits. Mineralisation that is trending along N50°W 30–35°NE occurs between the Alacam Granite and the carbonate rocks of the Menderes Massif Metamorphites. Microscopic analysis revealed that the mineralisation contains chalcopyrite, pyrite, sphalerite, galena, fahlerz (tetrahedrite, tennantite), pyrrhotite, pyrargyrite-proustite, magnetite, and haematite as major ore minerals. The δ34S values range from 2.4 to 4.1‰ in pyrite (n = 2, mean = 3.25‰), from 1.7 to 3.4‰ in chalcopyrite (n = 4, mean = 2.8‰), 2.2–3.5‰ in sphalerite (n = 6, mean = 3.05‰), but from only 0.2–1.8‰ (n = 8, mean = 1.12‰) in galena. The low δ34S values of the sulphide minerals (varying over a narrow range) may indicate that sulphur in the ore-depositing solutions had a magmatic origin. The Pb isotope ratios of galena ranged from 18.729 to 18.742 for 206Pb/204Pb, 15.589 to 15.606 for 207Pb/204Pb, and 38.589 to 38.647 for 208Pb/204Pb. In one sphalerite sample, these ratios were measured as 18.738, 15.614, and 38.648, respectively. The Pb isotope model ages are between −90 and −45, which are consistent with those of J-type lead. In 207Pb/204Pb–206Pb/204Pb and 208Pb/204Pb–206Pb/204Pb diagrams, such ages plot below the average Pb-isotope crustal growth curve, indicating that lead in the studied mineralisation had an orogenic source.

中文翻译：

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dursunbey (balıkesir)铅锌矿床的硫和铅同位素地球化学

摘要 Biga 半岛（安纳托利亚西北部）拥有多个 Pb-Zn 矿床，而 Dursunbey Pb-Zn 矿床是土耳其重要的 Pb-Zn 省之一。研究区的基底岩包括 Menderes 地块的变质岩（Simav 变质岩、Saricasu 组和布达甘石灰岩）和 Izmir-Ankara 缝合带的蛇绿岩单元，称为 Dagardi Melange。这些单元被中新世 Alacam 花岗岩侵入。覆盖单元从早中新世 Yenikoy 地层（包括交替的砂岩、粘土岩、泥灰岩和粘土质石灰岩以及凝灰岩添加剂）开始，终止于 Civanadag 凝灰岩、Akdag 火山岩和 Toklargolu 地层，由独立的颗粒和冲积层组成。沿 N50°W 30-35°NE 趋势的矿化发生在 Alacam 花岗岩和 Menderes Massif 变质岩的碳酸盐岩之间。显微分析表明，该矿化含有黄铜矿、黄铁矿、闪锌矿、方铅矿、法勒兹（四面体、天南铁矿）、磁黄铁矿、吡硫铁矿-普鲁斯特矿、磁铁矿和赤铁矿等主要矿石矿物。δ34S 值范围为黄铁矿中的 2.4 至 4.1‰（n = 2，平均值 = 3.25‰），黄铜矿中的 1.7 至 3.4‰（n = 4，平均值 = 2.8‰），闪锌矿中的 2.2 至 3.5‰（n = 6） , 平均值 = 3.05‰)，但在方铅矿中只有 0.2–1.8‰（n = 8，平均值 = 1.12‰）。硫化物矿物的低 δ34S 值（变化范围很窄）可能表明矿床溶液中的硫具有岩浆成因。方铅矿的 Pb 同位素比范围为 18.729 至 18.742（206Pb/204Pb，15.589 至 15）。207Pb/204Pb 为 606，208Pb/204Pb 为 38.589 至 38.647。在一个闪锌矿样品中，这些比率分别测量为 18.738、15.614 和 38.648。Pb 同位素模型年龄在−90 到−45 之间，与J 型铅的年龄一致。在 207Pb/204Pb–206Pb/204Pb 和 208Pb/204Pb–206Pb/204Pb 图中，这些年龄分布在平均 Pb-同位素地壳生长曲线下方，表明所研究矿化中的铅具有造山源。