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首页> 外文期刊>Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration >Fluid inclusion and stable isotope study of the Shagou Ag-Pb-Zn deposit, Luoning, Henan province, China: Implications for the genesis of an orogenic lode Ag-Pb-Zn system
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Fluid inclusion and stable isotope study of the Shagou Ag-Pb-Zn deposit, Luoning, Henan province, China: Implications for the genesis of an orogenic lode Ag-Pb-Zn system

机译：中国河南省洛宁市沙沟Ag-Pb-Zn矿床流体包裹体和稳定同位素研究：对造山矿Ag-Pb-Zn系统成因的启示

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The Shagou deposit located in the eastern Qinling orogenic belt central China and hosted by the Taihua Supergroup, is a large-sized Ag-Pb-Zn deposit and has proven reserves of 1.54 million tons of ore with grades of 767 g/t Ag, 13.24% Pb and 4.31% Zn. The ore-forming fluids have been previously interpreted as products of direct exsolution of a crystallizing magma or sudden decompression of the fluid exsolved from magma, defining the Shagou deposit as an intrusion-related system. In this study, the Shagou deposit has been identified as an orogenic type mineralization system. The hydrothermal ore-forming process can be divided into the early quartz-pyrite, middle quartz-polymetallic sulfides and late quartz-carbonate stages. Four types of fluid inclusions in quartz can be distinguished between PC C, W and PW types. The early and middle stage quartz contains the PC, C and W type fluid inclusions, while only W and PW type fluid inclusions can be observed in the late stage quartz. In the early stage, the W type fluid inclusions homogenized at 173-369 °C (concentrating at 200-240 °C), with salinities ranging from 5.4 to 8.3 wt.% NaCl equiv. But in the middle stage, the C and W type fluid inclusions homogenized at 112-313 °C (concentrating at 180-220 °C), with salinities ranging from 0.7 to 13.6 wt% NaCl equiv. In the late stage, the W type fluid inclusions homogenized at 108-253 °C (concentrating at 160-200 °C), with salinities ranging from 2.1 to 8.1 wt% NaCl equiv. The fluids may have experienced a boiling process or fluid mixing in the middle stage. The estimated trapping pressures of fluid inclusions in the middle stage ranged from 33 to 211 MPa, corresponding to a mineralization depth from 3.3 to 7.7 km. For the early stage fluids, the calculated δ~(18)O_(H_2O) and δD_(H_2O) values are 7.5-9.1‰, - 96.2 to -110.5‰, respectively. For the middle stage fluids, these two values are 1.5-5.3‰, - 75.6 to -110.7‰ but change to 1.0‰ and — 87‰ for the late stage, suggesting an evolution from metamorphic to meteoric in origin. In general, the Shagou Ag-Pb-Zn deposit is similar in many respects to typical orogenic type mineralization systems.
机译：位于华中秦岭造山带的沙沟矿床，由太华超级集团承建，是大型的Ag-Pb-Zn矿床，已探明储量为154万吨矿石，品位为767 g / t Ag，13.24。 ％Pb和4.31％Zn。以前已将成矿流体解释为结晶岩浆直接溶出或从岩浆中溶出的流体突然减压的产物，从而将沙沟矿床定义为与侵入有关的系统。在这项研究中，沙沟矿床已被确定为造山型成矿系统。水热成矿过程可分为早期石英黄铁矿，中间石英多金属硫化物和晚期石英碳酸盐阶段。石英中的四种流体夹杂物可以区分PC C，W和PW类型。早期和中期石英包含PC，C和W型流体夹杂物，而在晚期石英中只能观察到W和PW型流体夹杂物。在早期阶段，W型流体包裹体在173-369°C（在200-240°C浓度下）均质，盐度范围为5.4至8.3 wt。％NaCl当量。但是在中间阶段，C型和W型流体夹杂物在112-313°C（180-220°C浓缩）下均质，盐度为0.7至13.6 wt％NaCl当量。在后期，W型流体包裹体在108-253°C（在160-200°C浓缩）下均质，盐度范围为2.1至8.1 wt％NaCl当量。流体可能在中间阶段经历了沸腾过程或流体混合。估计的中段流体包裹体的捕集压力范围为33至211 MPa，对应于成矿深度为3.3至7.7 km。对于早期流体，计算出的δ〜（18）O_（H_2O）和δD_（H_2O）值分别为7.5-9.1‰，-96.2至-110.5‰。对于中层流体，这两个值分别为1.5-5.3‰，-75.6至-110.7‰，但后期变化为1.0‰和-87‰，表明其起源由变质到陨变。通常，沙沟银-铅-锌矿床在许多方面都与典型的造山型矿化系统相似。

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