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晋东北地区以唐河大断裂为核心的一组早燕山期 NW向张剪性断裂与区域 NE向复向斜复合部位 ,控制着区内燕山期中酸性浅成侵入体及其与之有关的铁、金、铜矿化 ,义兴寨金矿是该地区具代表性的典型矿床。金矿床为热液型脉状金 -多金属矿床 ,矿体受岩体和断裂构造控制。金矿床分 4个成矿期 ,8个亚期。对金矿床的矿床地质特征、成矿流体成分、性质、成矿物理化学条件及成矿时代的研究表明 ,成矿溶液的 p H值为 6 .1 6～ 6 .5 3:Eh值为 -0 .2 81～-0 .2 80 ;lgf O2 =-3.6～ -2 9,lgf CO2 =4 .3～ 5 .2 ;成矿温度为 1 90～ 349℃ ;成矿压力为 2 0 .0～ 76 .0 MPa;矿床主成矿期石英的 40 Ar— 3 9Ar坪年龄为 ( 1 31 .4± 3.1 ) Ma。
In the northeastern part of Shanxi Province, a group of NE-trending Zhang-shek fault and NE-trending synclinal complex in the early Yanshanian period dominated by the Tanghe fault rupture control the intermediate-acidic shallow intrusions and the related iron , Gold and copper mineralization, Yi Xing Zhai gold deposit is a typical representative of the region deposits. The gold deposit is a hydrothermal type vein-gold-polymetallic deposit, and the ore body is controlled by the rock mass and fault structure. The gold deposit is divided into 4 metallogenic stages and 8 sub-stages. The study on the geologic characteristics, compositions and properties of ore-forming fluids, physicochemical conditions and metallogenic epochs of the gold deposits shows that the p H value of the ore-forming solution is between 6 1.6 and 6.35: the Eh value is -0 .2 81 ~ -0 .2 80; lgf O2 = -3.6 ~ -2 9, lgf CO2 = 4.3 ~ 5.2; metallogenic temperature is 1 90 ~ 349 ℃; metallogenetic pressure is 20 ~ 76.0 MPa. The 40Ar- 3 9Ar plateau of the quartz during the main metallogenic stage was (1 31.4 ± 3.1) Ma.