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首页> 外文期刊>Geochemistry: Exploration, Environment, Analysis >Geochemical effects of endoskarn formation in the Mazraeh Cu-Fe skarn deposit in northwestern Iran
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Geochemical effects of endoskarn formation in the Mazraeh Cu-Fe skarn deposit in northwestern Iran

机译：伊朗西北部Mazraeh铜铁矽卡岩矿床内矽卡岩形成的地球化学效应

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The Mazraeh Cu–Fe skarn deposit, located in the Ahar region of northwestern Iran, is currently being mined and contains reserves of about 400,000 tons grading 1.2 wt% Cu. The deposit contains both exoskarn formed within the calcareous wall rock and endoskarn formed within the associated granodiorite. Mineralogically, there are three types of skarn at Mazraeh: (1) pyroxene exoskarn; (2) garnet endoskarn and exoskarn; and (3) secondary epidote skarn. Locally, gradational alteration of the Mazraeh granodiorite to garnet endoskarn is present over a width of one metre. Mass-balance calculations show that garnetization of the Mazraeh granodiorite was the result of interaction with a hydrothermal solution enriched in Si, Fe2+, Fe3+, Mn, Ca, Mg, P, Ag, Cu, Zn, La, Pb, Cd, Mo, and Y. These elements are thought to have originated from the magma. The calcareous wall rocks (limestone and marble) were the main source of Ca and Mg within the endoskarn. This hydrothermal alteration resulted in an average 157% volume gain in the affected wall rocks. The dilatent structures and open spaces were filled by paragenetically younger minerals, especially magnetite, pyrite, chalcopyrite, bornite, covellite, chalcocite, epidote, calcite and quartz, during the late stage of alteration. During the endoskarnification process, primary biotite, hornblende and titanite in the Mazraeh granodiorite have been replaced by chlorite and rutile, and plagioclase and K-feldspar have been replaced by garnet. These reactions have leached (removed) K, Na, Ba, Rb and possibly Sr and added Si, Fe, Mn, Ca, Mg, P, Ag, Cu, Zn, La, Pb, Cd, Mo, W and Y.
机译：位于伊朗西北部阿哈尔地区的Mazraeh Cu-Fe矽卡岩矿床目前正在开采中，其储量约为40万吨，品位为1.2 wt％的Cu。沉积物 既包含在钙质壁岩 内形成的外生岩，也包含在相关花岗闪长岩内形成的内矽卡岩。从矿物学上讲， 在马兹雷有三种矽卡岩：（1）辉石外生矽卡岩； （2）石榴石内生矽卡岩和外矽卡岩； （3）次要附子 skarn。从局部上看，Mazraeh花岗闪长岩 到石榴石内生矽卡岩的梯度变化范围为一米。质量平衡 计算表明，Mazraeh花岗闪长石 的石榴石化是与富含Si，Fe 2的富集 的水热溶液相互作用的结果。 + ，Fe 3 + ，Mn，Ca，Mg，P，Ag，Cu，Zn，La，Pb，Cd，Mo， 和Y。元素被认为起源于 岩浆。钙质壁岩（石灰岩和大理石）是内生矽卡岩中钙和镁的主要来源。这种热液改变使受影响的围岩平均体积增加了157％。易碎的年轻矿物，尤其是磁铁矿，黄铁矿， 黄铜矿，堇青石，玄武岩，黄铜矿，橄榄石，方解石，方解石充填了 和石英，在蚀变的后期。在 内钙化过程中，Mazraeh花岗闪长岩中的主要黑云母，角闪石和 钛铁矿被绿泥石 和金红石，斜长石和钾长石所代替。已被石榴石替换 。这些反应浸出（去除）了K，Na，Ba， Rb以及可能的Sr，并添加了Si，Fe，Mn，Ca，Mg，P，Ag，Cu， Zn ，La，Pb，Cd，Mo，W和Y。

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