Geological characteristics of Nanwanzi silver-gold deposit in Wengniute Qi, Inner Mongolia
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摘要:
通过对内蒙古南湾子银金矿床的野外地质调查, 发现4条银金矿体, 16条断层及断裂破碎带.结合室内样品测试结果和综合资料研究, 从矿区地质构造、矿床相关的岩石学、矿物学等方面入手, 深入研究该银金矿的矿床地质特征, 探索其成因与找矿标志.南湾子银金矿主要赋存于额里图组沉凝灰角砾岩、含角砾凝灰岩及喷溢相流纹岩中, 矿体主要受F1、F2、F12、F13断裂控制.矿石类型为铁锰质石英脉型, 主要金属矿物为软锰矿、硬锰矿、黄铁矿、针铁矿、纤铁矿及黝铜矿.矿石结构主要为半自形-他形粒状结构.矿石构造以稀疏浸染状构造、块状构造为主.矿体呈豆荚状扁豆体、小透镜状、豆状、薄层状赋存在地层中.研究认为金和银不存在明显伴生关系, 矿床成因类型属中低温热液蚀变型.含铁锰质石英脉是直接找矿标志.
Abstract:By field geological survey, 4 silver-gold orebodies and 16 faults or fracture zones are found in the Nanwanzi silver-gold deposit in Inner Mongolia. Combined with laboratory sample testing results and comprehensive data, the geological characteristics, genesis and prospecting indicators of the silver-gold deposit are studied on the basis of geological structures of the orefield, and related petrology and mineralogy of the deposit. The Nanwanzi silver-gold deposit is occurred mainly in the tuffite breccia, breccia-bearing tuff and effusive rhyolite of Elitu Formation, and the orebody is mainly controlled by F1, F2, F12 and F13 faults. The orebody is of ferromanganic quartz vein type, with metal minerals of pyrolusite, psilomelane, pyrite, goethite, lepidocrocite and tetrahedrite. The ores are in hypidiomorphic-allotriomorphic granular texture, dominated by sparse disseminated structure and massive structure. The orebodies are in podiform lenticle, lenticular, pisolitic and thin-bedded shapes. The study shows that there is no obvious associating relationship between gold and silver. The deposit genetically belongs to meso-epithermal alteration type. The ferromanganic quartz vein is the direct prospecting indicator.
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Key words:
- silver-gold deposit /
- prospecting indicator /
- deposit genesis /
- ore-controlling factor /
- Inner Mongolia
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表 1 南湾子银金矿石英脉特征
Table 1. Characteristics of quartz veins in Nanwanzi silver-gold deposit
石英脉编号 产状/（°） 长度/m 宽度/m 说明 1号 （15~30）∠（62~67） 208 2~4 Ⅰ号银金矿体主矿体 2号 （5~15）∠70 130 0.5~1.5 Ⅱ号银金矿体主体 3号 （160~170）∠（65~70） 430 0.6~2.0 Ⅲ号银矿体主矿体 4号 （160~170∠（65~70） 120 2~6 Ⅳ号银矿体主矿体 5号 150∠72 65 0.5~1.0 LTC1201揭露，Ag品位6.9×10-6 6号 200∠67 20 1.0 LTC1203揭露，Ag 21.3×10-6、Au 0.204×10-6 7号 170∠64 15 1 TC1501揭露，Ag 72.04×10-6、Au 0.398×10-6 8号 140∠67 25 1.8 TC1507揭露，Ag 36.47×10-6、Au 0.699×10-6 9号 200∠（62~64） 85 0.6 TC1526、TC1527揭露，Ag 10.182×10-6 10号 330∠59 15 0.6 TC1517揭露 11号 20∠6 20 1.0 TC1518揭露 
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表 2 南湾子银金矿床矿体特征表
Table 2. Orebody characteristics of Nanwanzi silver-gold deposit
矿体编号 长度/m 真厚度/m 水平厚度/m 倾向/（°） Au/10-6 Ag/10-6 倾向延伸/m 矿体形态 Ⅰ-1 银 200 7.12 7.46 15～30 1.83 166.61 250 豆荚状扁豆体 Ⅰ-1 金 200 3.63 7.46 15～30 1.83 166.61 250 豆荚状扁豆体 Ⅰ-2 金 90 2.99 3.30 15～30 2.58 90 小透镜状 Ⅲ-1 75 4.15 4.58 170 1.01 85.48 80 豆状 Ⅲ-2 100 1.96 2.17 170 213.17 50 薄层状 Ⅳ 130 3.23 3.56 160～170 96.49 56 小的透镜状
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表 3 南湾子银金矿矿石组合样分析结果表
Table 3. Analysis results of ore assemblage samples from Nanwanzi silver-gold deposit
样品编号 As Sb Co Mo WO3 ZH1 0.045 0.0010 0.0014 0.0010 0.0027 ZH2 0.015 0.0010 0.0010 0.0010 0.0030 ZH3 0.027 0.0011 0.0012 0.0010 0.0052 ZH4 0.015 0.0010 0.0018 0.0010 0.0024 ZH5 0.015 0.0010 0.0012 0.0010 0.0022 测试单位：内蒙古自治区第十地质勘查开发院. 含量单位：%.
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表 4 南湾子银金矿矿石样品全分析结果表
Table 4. Total analysis results of ore samples from Nanwanzi silver-gold deposit
分析编号 CaO MgO K2O Na2O SiO2 Los TiO2 P2O5 SO3 TFe AlO3 MnO H1803-027 8.93 5.41 0.10 0.30 55.30 12.20 0.22 0.027 0.66 4.28 5.90 0.03 H1803-028 12.17 4.73 0.00 0.75 56.72 15.90 0.21 0.017 0.19 3.35 1.91 0.20 测试单位：内蒙古自治区第十地质勘查开发院.含量单位：%.
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