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首页> 外文期刊>Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration >Mineralogy, chalcopyrite Re-Os geochronology and sulfur isotope of the Hujiayu Cu deposit in the Zhongtiao Mountains, North China Craton: Implications for a Paleoproterozoic metamorphogenic copper mineralization
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Mineralogy, chalcopyrite Re-Os geochronology and sulfur isotope of the Hujiayu Cu deposit in the Zhongtiao Mountains, North China Craton: Implications for a Paleoproterozoic metamorphogenic copper mineralization

机译：华北克拉通中虎山胡家yu铜矿床的矿物学，黄铜矿Re-Os年代学和硫同位素：古元古代变质期铜矿化的意义

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The Hujiayu Cu deposit, located in the Zhongtiao Mountains district of southern North China Craton, is hosted by graphite schist and dolomitic marble with disseminated to veinlet (stage I) and thick vein (stage II) mineralization. Stage I mineralization, characterized by stratabound, disseminated pyrite and chalcopyrite within the graphite schist host rock, formed at the syn-metamorphic stage. Graphite geothermometry showed that the host rock was subjected to an upper-greenschist to lower amphibolite metamorphism at a temperature range of 486 to 596 degrees C, averaging of 546 +/- 35 degrees C (1 sigma, n = 19). Stage II mineralization, consisting of brecciated dolomitic thick veins cemented by quartz-sulfide assemblages, was a product of metamorphic hydrothermal activity. This thick vein was subdivided into an early hydrothermal dolomitic alteration composing of dolomitic breccia with some cobaltiferous pyrite (stage IIa) and a late siliceous-copper mineralization consisting of quartz-sulfide assemblages (stage IIb). A clausthalite-siegenite-sphalerite-chalcopyrite mineral assemblage was observed in stage IIb, constraining the sulfur fugacity and selenium fugacity within -18.7 to -11.7 and -21.7 to -14.7, respectively. It was inferred stage IIb was marked by a drop in sulfur fugacity and a substantial increase in selenium fugacity after the major chalcopyrite precipitation. Calculations based on the compositions of cobaliterous pyrite and sphalerite reveal that the mineral assemblage at stage Ha formed at an approximately temperature range of 400 to 300 degrees C, whereas the minerals in stage lib occurred at temperature of 256 +/- 9 degrees C (1 sigma, n = 7). Sulfides from stage I have delta(34)5 value ranging from 10.1 to 22.2 parts per thousand with an average value of 16.9 +/- 3.4 parts per thousand (1 sigma, n = 27), supporting the model that sulfides precipitated through thermochemical reduction of sulfate at sedimentary stage followed by metamorphic homogenization of delta S-34 isotopic signatures. Sulfides from the stage II have delta S-34 values in highly variable ranging from 3.4 to 19.2 parts per thousand, indicating a rather complex source. Four chalcopyrite samples yielded a weighted model age of 1952 +/- 39 Ma (1 sigma, MSWD = 1.5), suggesting that the copper mineralization formed synchronously with regional metamorphism (1970-1850 Ma) and hence a Paleoproterozoic metamorphogenic copper mineralization is implicated. Therefore, we envisaged disseminated-veinlet mineralization formed during a metamorphic peak and the major hydrothermal copper mineralization occurred during the retrograde cooling. (C) 2016 Elsevier B.V. All rights reserved.
机译：胡家yu铜矿床位于华北克拉通南部的中条山地区，由石墨片岩和白云岩大理石所包裹，并散布到小矿脉（第一阶段）和粗脉矿化（第二阶段）。第一阶段矿化的特征是在准变质阶段形成的石墨片岩宿主岩中的层状，弥散的黄铁矿和黄铜矿。石墨地热测定法表明，在486至596摄氏度的温度范围内，平均546 +/- 35摄氏度（1 sigma，n = 19），对基质岩进行了上绿化作用，以降低闪石的变质作用。第二阶段矿化是变质热液活动的产物，该阶段的白垩纪白云岩厚脉被石英-硫化物组合胶结而成。该粗脉被细分为由白云岩角砾岩与一些钴铁矿黄铁矿组成的早期热液白云岩蚀变（阶段IIa）和由石英硫化物组合组成的晚期硅质铜矿化（阶段IIb）。在IIb阶段观察到了硅镁石-堇青石-闪锌矿-黄铜矿矿物组合，分别将硫逸度和硒逸度限制在-18.7至-11.7和-21.7至-14.7之间。据推断，IIb阶段的特征是主要黄铜矿沉淀后硫逸度下降而硒逸度显着增加。根据钴酸铝黄铁矿和闪锌矿的组成进行的计算表明，阶段Ha的矿物聚集在大约400至300摄氏度的温度范围内形成，而阶段IIb的矿物发生在256 +/- 9摄氏度的温度下（1 sigma，n = 7）。来自阶段I的硫化物的delta（34）5值范围为千分之10.1至22.2，平均值为千分之16.9 +/- 3.4（1 sigma，n = 27），支持了硫化物通过热化学还原沉淀的模型沉积阶段先进行硫酸盐沉淀，然后对δS-34同位素特征进行变质均质化。来自阶段II的硫化物的δS-34值变化很大，范围为千分之3.4至19.2，表明来源相当复杂。四个黄铜矿样品的加权模型年龄为1952 +/- 39 Ma（1 sigma，MSWD = 1.5），表明铜矿化与区域变质同时形成（1970-1850 Ma），因此涉及古元古代变质生铜矿化。因此，我们设想了在变质峰期间形成的弥散性小孔矿化作用，而主要的热液铜矿化作用发生在逆行冷却过程中。 （C）2016 Elsevier B.V.保留所有权利。

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