湖南枞树板铅锌矿区构造特征及控矿条件研究

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枞树板铅锌矿处于EW向山河复背斜和SN向西山复背斜复合部位。围岩为震旦系浅变质碎屑岩。NE向压扭性断裂是铅锌矿体的控矿及赋矿构造,富矿体产在控矿断裂较宽大且较破碎的部位,受构造透镜体控制;富矿体长轴向SW侧伏,侧伏角50°—60°,长宽比为2∶1,出露标高向SW次第降低呈斜列之势;稀土元素、微量元素和硫、铅同位素特征显示成矿物质主要来自千里山花岗岩,成矿时代为燕山早期(155—170Ma),成矿温度168—244°C,属岩浆期后中低温热液矿床,是千里山岩体岩浆成矿系列(东坡矿田)的组成部分。花岗斑岩脉晚于铅锌矿脉侵位于NE向断裂中,局部穿切并破坏矿脉。区域上成矿、找矿有利部位是燕山早期小岩体周围或地下3—5km处并有隐伏岩体发育的地区。 Fushu Ban lead-zinc ore in the EW Xiangshanhe anticline and SN to Xishan complex anticlinal complex sites. Surrounding rocks are Sinian shallow metamorphic clastic rocks. The NE-direction compressive fracture is the ore-controlling and ore-bearing structure of lead-zinc ore body. The ore-bearing structure is controlled by tectonic lens in the location where the ore-bearing faults are broad and fragmentary, , The lateral volt-ampere angle is 50 ° -60 °, the aspect ratio is 2:1, and the outcrop of elevation is SW to decrease obliquely. The REE, trace elements and sulfur and lead isotopic characteristics show that the ore-forming materials are mainly from the thousands of thousands of miles of granite , The mineralization age is early Yanshanian (155-170Ma) and the ore-forming temperature is 168-244 ° C, which belongs to the post-magmatic epithermal deposit and is part of the Qianlishan porphyry magmatic mineralization series (Dongpo orefield) . The granite porphyry veins were later than the Pb-Zn veins in NE trending faults, partially penetrating and destroying the veins. In the area of ​​mineralization, the favorable prospecting area is the area around 3-5km around the small rock mass in the early Yanshan area and with concealed rock mass development.
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