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首页> 外文期刊>Geosciences >Geology and Isotope Systematics of the Jianchaling Au Deposit, Shaanxi Province, China: Implications for Mineral Genesis
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Geology and Isotope Systematics of the Jianchaling Au Deposit, Shaanxi Province, China: Implications for Mineral Genesis

机译：陕西省尖岔岭金矿床地质与同位素系统学：对矿物成因的启示

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The giant Jianchaling Au (52 t Au) deposit is located in the Mian-Lue-Yang Terrane in the southern part of the Qinling Orogen of central China and is hosted by metamorphosed carbonate rocks of the Late Neoproterozoic Duantouya Formation. The deposit consists of multiple generations of mineralised quartz(-carbonate) veins in WNW-trending extensional ductile-brittle shear zones. Based on the mineral assemblages and cross-cutting relationships between the quartz(-carbonate) veins, the paragenesis is characterised by an early coarse-grained pyrite-pyrrhotite-pentlandite-dolomite-quartz assemblage (I), followed by pyrite-sphalerite-galena-carbonate-arsenopyrite-fuchsite-carbonate-quartz containing gold (II), and fine-grained pyrite-dolomite-calcite-quartz-realgar (As 2 S 2 )-orpiment (As 2 S 3 ) (III). The H-O-C isotope systematics for the three vein sets indicate that the mineralising fluid is probably sourced from the metamorphic dehydration of carbonate rocks in the Duantouya Formation, and gradually mixed with meteoric water during the emplacement of the third vein set. The δ 34 S values for sulfides (6.3–16.6‰) from the second auriferous vein set are greater than zero, indicating sulfates reduction from the Neoproterozoic metamorphic rocks (Duantouya Fm). The ( 206 Pb/ 204 Pb) i ratios from pyrite (17.521–18.477) from each of the vein sets overlap those of the ultramafic rocks (18.324–18.717) and the Bikou Group (17.399–18.417), indicating that the units are possible sources for the sulfides in the mineralisation. Both εNd(t) and Isr(t) of sulfide overlap with the meta-ultramafic field and Duantouya formation and dominated with mature Sr-Nd character, which indicated that the Duantouya may play an important role during the ore formation and there may exist a minor ultramafic source that is involved in the ore fluid. The S-Pb-Sr-Nd isotopic ratios are closely related to those of the Bikou Group and Duantouya Formation, which indicates that the mineralised fluid has interacted with both units. Combining the previously published data with data from this study on the mineralised area, we surmise that Jianchaling is characteristic of an orogenic-type gold deposit related to the Triassic Qinling Orogeny associated with continental collision.
机译：巨大的Jian茶岭金（52 t Au）矿床位于中国中部秦岭造山带南部的绵乐阳洋地带，由新元古代末段头崖组变质碳酸盐岩包裹。该矿床由WNW趋势延伸延性脆性脆性剪切带中的多代矿化石英（碳酸盐）脉组成。根据矿物组合和石英（碳酸盐）脉之间的横切关系，共生的特征是早期的粗粒黄铁矿-蛇纹石-膨润土-白云石-白云石-石英组合（I），然后是黄铁矿-闪锌矿-方铅矿-含金的碳酸盐-砷-黄铁矿-碳酸钙-石英，以及细粒的黄铁矿-白云石-方解石-石英雄黄（As 2 S 2）-颜料（As 2 S 3）（III）。三个脉集的H-O-C同位素系统表明，成矿流体可能来自Duantouya组碳酸盐岩的变质脱水，并在第三个脉集进入过程中逐渐与陨石混合。第二耳房静脉中硫化物的δ34 S值（6.3-16.6‰）大于零，表明新元古代变质岩（Duantouya Fm）中的硫酸盐减少。来自每个脉动组的黄铁矿（17.521–18.477）的（206 Pb / 204 Pb）i比值与超镁铁质岩石（18.324–18.717）和碧口组（17.399–18.417）的比值重叠，表明这些单位是可能的矿化中硫化物的来源。硫化物的εNd（t）和Isr（t）都与超超声场和Duantouya地层重叠且以成熟的Sr-Nd特征为主，这表明Duantouya可能在成矿过程中起重要作用，并且可能存在矿液中涉及的少量超镁铁质来源。 S-Pb-Sr-Nd同位素比与碧口组和段头崖组密切相关，表明矿化流体已经与这两个单元相互作用。结合先前发表的数据和该矿床研究的数据，我们推测鉴岔岭是与陆相碰撞相关的三叠纪秦岭造山运动有关的造山型金矿床的特征。

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