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首页> 外文期刊>Resource Geology >The Ore-forming Fluid of the Gold Deposits of Muru Gold Belt in Eastern Shandong, China - a Case Study of Denggezhuang Gold Deposit
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The Ore-forming Fluid of the Gold Deposits of Muru Gold Belt in Eastern Shandong, China - a Case Study of Denggezhuang Gold Deposit

机译：山东东部木鲁金矿带金矿床成矿流体-以登格庄庄金矿床为例

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Denggezhuang gold deposit is an epithermal gold-quartz vein deposit in northern Muru gold belt, eastern Shandong China. The deposit occurs in the NNE-striking faults within the Mesozoic granite. The deposit consists of four major veins with a general NNE-strike. Based on crosscutting relationships and mineral parageneses, the veins appear to have been formed during the same mineralization epochs, and are further divided into three stages: (1) massive barren quartz veins; (2) quartz-sulfides veins; (3) late, pure quartz or calcite veinlets. Most gold mineralization is associated with the second stage. The early stage is characterized by quartz, and small amounts of ore minerals (pyrite), the second stage is characterized by large amounts of ore minerals. Fluid inclusions in vein quartz contain C-H-O fluids of variable compositions. Three main types of fluid inclusions are recognized at room temperature: type I, two-phase, aqueous vapor and an aqueous liquid phase (L + V); type II, aqueous-carbonic inclusions, a CO_2-liquid with/without vapor and aqueous liquid (LCO_2 + VCO_2 + Laq.); type III, mono-phase aqueous liquid (Laq.). Data from fluid inclusion distribution, microthermometry, and gas analysis indicate that fluids associated with Au mineralized quartz veins (stage 2) have moderate salinity ranging from 1.91 to 16.43 wt percent NaCl equivalent (modeled salinity around 8-10 wt percent NaCl equiv.). These veins formatted at temperatures from 80 deg to 280 deg C. Fluids associated with barren quartz veins (stage 3) have a low salinity of about 1.91 to 2.57 wt percent NaCl equivalent and lower temperature. There is evidence of fluid immiscibility and boiling in ore-forming stages. Stable isotope analyses of quartz indicate that the veins were deposited by waters with delta~(18)O and SD values ranging from those of magmatic water to typical meteoric water. The gold metallogenesis of Muru gold belt has no relationship with the granite, and formed during the late stage of the crust thinning of North China.
机译：登格庄金矿床是位于中国山东东部穆鲁金矿带北部的超热金石英脉矿床。该沉积物发生在中生代花岗岩的NNE走向断裂中。该矿床由四条主要矿脉组成，并伴有NNE走向。根据横切关系和矿物共生关系，这些矿脉似乎是在相同的矿化时期形成的，并进一步分为三个阶段：（1）块状粗石英脉; （2）石英硫化物脉; （3）晚期，纯石英或方解石脉。大多数金矿化与第二阶段有关。早期的特征是石英和少量的矿石矿物（黄铁矿），第二阶段的特征是大量的矿石矿物。脉状石英中的流体包裹体包含组成可变的C-H-O流体。在室温下，可识别出三种主要类型的流体夹杂物：I型，两相，水蒸气和液相（L + V）。 II型，含水碳夹杂物，有/无蒸气的CO_2液体和含水液体（LCO_2 + VCO_2 + Laq。）; III型单相水性液体（Laq。）。来自流体包裹体分布，微量热测量法和气体分析的数据表明，与金矿化石英脉相关的流体（阶段2）的中度盐度范围为1.91至16.43 wt％NaCl当量（模型盐度约为8-10 wt％NaCl当量）。这些脉在80摄氏度至280摄氏度的温度下形成。与贫瘠的石英脉相关的流体（第3阶段）的盐度较低，NaCl当量约为1.91至2.57 wt％，并且温度较低。有证据表明在成矿阶段流体不混溶和沸腾。石英的稳定同位素分析表明，这些脉是由δ（18）O和SD值介于岩浆水到典型陨石水之间的水沉积的。穆鲁金矿带的金成矿作用与花岗岩无关，形成于华北地壳减薄后期。

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