The Dochileh stratiform copper deposit in the Sabzevar Zone of northeastern Iran is hosted in the basaltic sequence of the Upper Eocene age. The host rock displays two hydrothermal events: zeolite–carbonate alteration that is a stratigraphic–lithologic feature and chlorite and chlorite/ferruginous alterations in the local mineralized structures. Ore formation is related to both hydrothermal events and occurs in both stratiform and vein mineralization types. Mineralization consists of main chalcocite with variable amounts of bornite, chalcopyrite, native copper, malachite, and cuprite minerals, which occur as hydrothermal breccias, and disseminated, vein, and veinlet forms. Geophysical field studies using resistivity and induction polarization (IP) methods were conducted along nine survey lines in the area. As a result of modeling and interpretation of the acquired geophysical data, high values of IP and resistivity corresponding to mineralization were observed at two depth levels: 0–20 m and more than 40 m. Based on these geological and geophysical investigations, six locations for drilling exploration boreholes were proposed. Drilling data confirmed the mineralization containing high copper values in the two depth levels: the vein‐type mineralization in the surface and shallow depth level, and the stratiform mineralization at the deeper level. Fluid inclusion studies in calcite and quartz from stratiform‐ and vein‐type mineralization show the evidence of mixing, and a linear dilution trend during the ore formation occurred at a wide range of temperatures: 121–308°C and 80–284°C, respectively, and varying salinities of between 3.2–16.8 and 0.8–22 wt% NaCl equivalents. The stable isotope composition of δ³⁴S that falls in a range of −2.4 to +25.0‰ could be considered biogenetic sulfur from bacterial sulfate reduction and leaching of sulfur from hosting basalt. The δ¹³C values of calcite vary between −0.6 and −7.6‰, suggesting a major contribution of marine carbonates associated with igneous carbonates, and the δ¹⁸O_SMOW values of calcite are between +15.2 and +19.9‰, suggesting a contribution of δ¹⁸O‐rich sedimentary rocks and δ¹⁸O‐poor meteoric water. Copper and sulfide‐rich hydrothermal fluid have flowed upward through the local faults and permeable interbeds within the Eocene volcanic sequence and have formed the mineralized veins and horizons. The geophysical results have detected the local faults as the channel ways for mineralization.

中文翻译：

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Dochileh地区硫化铜矿化的地质和地球物理研究：以伊朗Sabzevar地区的Manto型矿床为例

伊朗东北部Sabzevar区的Dochileh层状铜矿床位于上始新世的玄武岩层序中。基质岩表现出两个热液事件：沸石-碳酸盐蚀变是地层-岩性特征，局部矿化结构中的绿泥石和亚氯酸盐/铁质蚀变。矿石的形成与热液事件都有关，并且以层状和脉状矿化类型发生。矿化作用由主要的辉绿岩和不定数量的斑铁矿，黄铜矿，天然铜，孔雀石和铜矿矿物组成，它们以热液角砾岩的形式出现，呈散布，脉状和细脉状。沿该地区的9条测量线进行了使用电阻率和感应极化（IP）方法的地球物理场研究。对获取的地球物理数据进行建模和解释的结果是，在两个深度级别（0至20 m和40 m以上）观察到了与矿化相对应的IP和电阻率高值。在这些地质和地球物理调查的基础上，提出了六个钻探钻孔位置。钻探数据证实了在两个深度水平上的矿化含铜量很高：地表和浅深度水平的脉动型矿化，以及在更深水平的层状矿化。来自层状和脉状矿化的方解石和石英中的流体包裹体研究显示了混合的证据，并且矿石形成过程中的线性稀释趋势在以下温度范围内发生：121–308°C和80–284°C，盐度分别在3.2-16.8和0之间。8-22 wt％的氯化钠当量。δ的稳定同位素组成处于-2.4至+ 25.0‰范围内的³⁴ S可以被认为是细菌硫酸盐还原产生的生物成因硫，以及玄武岩中硫的浸出。的δ ¹³方解石的C值-0.6之间变化-7.6‰，提示与火成岩碳酸盐相关海相碳酸盐的一个重大贡献，并且δ ¹⁸ ø _SMOW方解石的值是15.2和19.9 +之间‰，提示的贡献δ ¹⁸富含O形沉积岩和δ ¹⁸贫水的流水。富含铜和硫化物的热液流向上穿越始新世火山岩层序内的局部断层和渗透夹层，并形成了矿化的脉和地层。物探结果表明，局部断层是成矿的途径。