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首页> 外文期刊>Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration >Mineral chemistry of hydrothermal biotite from the Kahang porphyry copper deposit (NE Isfahan), Central Province of Iran
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Mineral chemistry of hydrothermal biotite from the Kahang porphyry copper deposit (NE Isfahan), Central Province of Iran

机译：伊朗中部省卡杭斑岩铜矿床（伊斯法罕）的热液黑云母的矿物化学

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The Kahang porphyry Cu deposit, located northeast of Isfahan city in central of Iran, is associated with a com posite Miocene stock and ranges in composition from diorite through granodiorite to quartz-monzonite. Field observations and petrographic studies show that the emplacement of the Kahang stock occurred in several pulses, each associated with its related hydrothermal activity. Early hydrothermal alteration started with a potassic style in the central part of the system and produced a secondary biotite-K-feldspar-magnetite as semblage accompanied by chalcopyrite and pyrite mineralization. Propylitic alteration that took place at the same time as the potassic alteration occurred in the peripheral portions of the stock. Subsequent phyllic alteration overprinted earlier potassic and propylitic alterations. Biotite grains from the potassic and phyllic zones show distinct chemical compositions. The FeO, TiO_2, MnO, K_2O, and Na_2O concentrations in biotite from the phyllic alteration zone are lower than those from the potassic alteration zone. The F and Cl contents of biotite from the potassic alteration zone display relatively high positive correlation with the X_(Mg). The fluorine intercept values [IV(F)] from the potassic and phyllic alteration zones are strongly correlated with the fluorine/chlorine intercept values [IV(F/Cl)]. Biotite geothermometry for the potassic and phyllic alteration zones, based on the biotite geothermometer of Beane (1974), yields a temperature range of 422° to 437 ℃ (mean = 430 ℃) and 329° to 336 ℃ (mean = 333 ℃), respectively. The position of data in log (X_F/X_(OH)) ratio vs. X_(Mg) and X_(Fe) diagram suggests that biotite formed under dissimilar composition and temperature conditions in the potassic and phyllic alteration zones. Calculated log fugacity ratios of f/H_2O//HF), (fH_2O/ fHCl), and (fHF/fHCl) show that hydrothermal fluids associated with the potassic alteration were distinctively different from those fluids associated with the phyllic alteration zone at Kahang porphyry Cu deposit. The results of this research indicate that the chemistry of biotite is related to the chemical composition of the magma and the prevailing physical conditions during crystallization.
机译：位于伊朗中部伊斯法罕市东北部的卡航斑岩铜矿床与中新世组合储量有关，其组成范围从闪长岩到花岗闪长岩再到石英蒙脱石。现场观察和岩石学研究表明，Kahang储层的沉积发生在几个脉冲中，每个脉冲都与其相关的热液活动有关。早期的热液蚀变以系统中部的钾盐型开始，并产生了次级黑云母-钾长石-磁铁矿的集合体，并伴有黄铜矿和黄铁矿成矿作用。与钾质变化同时发生的原质性变化发生在砧木的外围部分。随后的叶状蚀变覆盖了较早的钾和丙酸蚀变。来自钾和叶地区的黑云母粒显示出不同的化学组成。来自叶蚀蚀变带的黑云母中的FeO，TiO_2，MnO，K_2O和Na_2O浓度低于钾质蚀变带的黑云母。钾盐蚀变带中黑云母的F和Cl含量与X_（Mg）呈较高的正相关。来自钾和叶的蚀变区的氟截留值[IV（F）]与氟/氯截留值[IV（F / Cl）]密切相关。根据贝恩（1974）的黑云母地热计，对钾盐和叶肉蚀变带的黑云母地热法的温度范围为422°至437℃（平均= 430℃）和329°至336℃（平均= 333℃），分别。相对于X_（Mg）和X_（Fe）图的对数（X_F / X_（OH））比数据位置表明，黑钾石是在钾和叶蚀蚀变区的不同组成和温度条件下形成的。计算出的f / H_2O // HF），（fH_2O / fHCl）和（fHF / fHCl）的对数逸度比值显示，与钾化蚀变有关的热液与与卡杭斑岩Cu的蚀变带有关的流体明显不同。存款。研究结果表明，黑云母的化学性质与岩浆的化学成分和结晶过程中的主要物理条件有关。

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