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首页> 外文期刊>Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration >Genesis of two different types of gold mineralization in the Linglong gold field, China: Constrains from geology, fluid inclusions and stable isotope
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Genesis of two different types of gold mineralization in the Linglong gold field, China: Constrains from geology, fluid inclusions and stable isotope

机译：玲珑金矿田两种不同类型金矿的成因：地质，流体包裹体和稳定同位素的制约

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摘要

The Dongfeng and Linglong gold deposits are located in the northwest Jiaodong Peninsula, North China Craton. The deposits are mainly hosted in the Mesozoic granitoids and structurally controlled by the Zhaoyuan-Pingdu fault zone. Gold mineralization at Dongfeng occurs as disseminated ores and sulfide stockworlcs, typically enveloped by broad alteration selvages. In contrast, mineralization at Linglong is characterized by massive auriferous quartz veins with narrow alteration halos. Three stages of mineralization were identified in both deposits, with the early stage represented by quartz pyrite, the middle stage by gold + quartz + pyrite or gold + quartz + base metal sulfides, and the late stage by quartz + carbonate pyrite, respectively. Four types of fluid inclusions were distinguished based on petrography, microthermometry, and laser Raman spectroscopy, including (1) pure CO2 fluid inclusions (type I), (2) H2O-CO2-NaCl fluid inclusions (type II), (3) H2O-NaCl fluid inclusions (type III), and (4) daughter mineral-bearing or multiphase fluid inclusions (type IV). In the Dongfeng gold deposit, the early- and middle-stage quartz mainly contains primary type II fluid inclusions that completely homogenized at temperatures of 276-341 degrees C with salinities of 2.8-11.7 wt.% NaCl equivalent, and temperatures of 248-310 degrees C with salinities of 3.3-10.8 wt.% NaCl equivalent, respectively. A few primary type I fluid inclusions could be observed in the early-stage quartz. In contrast, the late-stage quartz contains only the type III fluid inclusions with homogenization temperatures of 117-219 degrees C, and salinities of 0.5-8.5 wt.% NaCl equivalent. The estimated pressures for the middle-stage fluids are 226-338 MPa, suggesting that gold mineralization mainly occurred at paleodepths of deeper than 8.4-12.5 km. The mineralization resulted from extensive water-rock interaction between the H2O-CO2-NaCl fluids and wallrocks in the first-order fault In the Linglong gold deposit, the early-stage quartz mainly contains primary type II fluid inclusions and a few type I fluid inclusions, of which type II fluid inclusions have salinities of 33-7.5 wt% NaCl equivalent and homogenization temperatures of 271-374 degrees C. The middle-stage quartz mainly contains all four types of fluid inclusions, among which the type II fluid inclusions yield homogenization temperatures of 251-287 degrees C and salinities of 5.5-10.3 wt.% NaCl equivalent, while the type III fluid inclusions have homogenization temperatures of 244-291 degrees C and salinities of 4.1-13.3 wt% NaCl equivalent. Fluid inclusions in the late-stage quartz are type III fluid inclusions with low salinities of 0.3-8.2 wt.% NaCl equivalent and low homogenization temperatures of 103-215 degrees C. The trapping pressure estimated for the middle-stage fluids is 228-326 MPa, suggesting that the gold mineralization mainly occurred at paleodepths of about 8.4-12.1 km. Precipitation of gold is possibly a consequence of phase separation or boiling of the H2O-CO2-NaCl fluids in response to pressure and temperature fluctuations in the open space of the secondary faults.
机译：东风和玲珑金矿床位于华北克拉通的胶东半岛西北部。矿床主要存在于中生代花岗岩中，构造上由招远—平度断裂带控制。东风的金矿化为散布的矿石和硫化物库存，通常被宽广的蚀变边缘包裹。相反，玲珑的矿化特征是大块的铁质石英脉，具有狭窄的蚀变晕。在这两个矿床中均确定了三个矿化阶段，分别以石英黄铁矿为代表的早期阶段，以金+石英+黄铁矿或金+石英+贱金属硫化物为代表的中期阶段，以及以石英+碳酸盐黄铁矿代表的后期阶段。根据岩相学，显微热分析法和激光拉曼光谱法区分了四种类型的流体包裹体，包括（1）纯CO2流体包裹体（I型），（2）H2O-CO2-NaCl流体包裹体（II型），（3）H2O -NaCl流体包裹体（III型），以及（4）子矿物质或多相流体包裹体（IV型）。在东风金矿床中，早期和中期石英主要包含II型初生流体包裹体，它们在276-341℃的温度下，盐度为2.8-11.7 wt。％的NaCl当量，在248-310的温度下完全均质。盐度分别为3.3-10.8 wt。％NaCl当量。在早期石英中可以观察到一些主要的I型流体包裹体。相比之下，后期石英仅包含III型流体夹杂物，均质温度为117-219摄氏度，盐度为0.5-8.5 wt。％NaCl当量。中段流体的估计压力为226-338 MPa，这表明金矿化主要发生在深于8.4-12.5 km的古深度。一阶断层中H2O-CO2-NaCl流体与围岩之间广泛的水-岩石相互作用导致矿化作用。在玲珑金矿床中，早期石英主要包含II型初生流体包裹体和I型初生流体包裹体。 ，其中II型流体包裹体的盐度为33-7.5 wt％NaCl当量，均质温度为271-374℃。中段石英主要包含所有四种类型的流体包裹体，其中II型流体包裹体产生均质化温度为251-287摄氏度，盐度为5.5-10.3 wt。％NaCl当量，而III型流体包裹体的均质温度为244-291摄氏度，盐度为4.1-13.3 wt％NaCl当量。晚期石英中的流体夹杂物是III型流体夹杂物，其盐度为0.3-8.2 wt。％NaCl当量，均质温度较低，为103-215摄氏度。中层流体的捕集压力估计为228-326。 MPa，表明金矿化主要发生在约8.4-12.1 km的古深度。金矿的沉淀可能是H2O-CO2-NaCl流体发生相分离或沸腾的结果，这是由于次级断层的开放空间中的压力和温度波动引起的。

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