GEOLOGY AND GENESIS OF NANZHUANG LEND-ZINC DEPOSIT IN NANZHAO COUNTY, HENAN PROVINCE
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摘要:
南庄铅锌矿床的矿体大多呈隐伏型，产于下古生界二郎坪群火神庙组石英角斑凝灰岩中.通过对矿床地质特征、矿石稀土元素和微量元素特征、同位素地球化学特征的综合分析研究，发现矿床具热水沉积特征和海水硫与幔源硫混合特性，成矿物质主要来源于上地幔，并混有造山带和上地壳的特征.基本确定该矿床属于弱变质作用改造的海底火山喷流型块状硫化物型矿床，建立了地层-岩性-蚀变-物探找矿标志.
Abstract:The orebodies in Nanzhuang lead-zinc deposit, mostly concealed, are occurred in the quartz-keratophyre tuff of Huoshenmiao Formation, Erlangping Group, Lower Paleozoic. Through comprehensive analysis on the geological features of deposit, characteristics of trace and rare earth elements in ores, and isotopic geochemistry, it is found that the deposit is characterized by hydrothermal deposition and mixing of seawater sulfur and mantle-derived sulfur, with the ore-forming materials mainly derived from the upper mantle, mixed with the characteristics of orogenic belt and upper crust. It is basically determined that the deposit belongs to submarine volcanic exhalation massive sulfide type reformed by weak metamorphism, and the strata-lithology-alteration-geophysical prospecting indicators are established based on the above.
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表 1 南庄铅锌矿区矿体特征表
Table 1. Characteristics of orebodies in Nanzhuang Pb-Zn deposit
矿体编号 形态 标高/m 埋深/m 延深/m 长度/m 厚度/m 倾向/（°） 倾角/（°） Zn品位/% Pb品位/% IN-1 层状 32~252 0~203 165 260 2.65 3 66 0.71~1.52 0.53~2.43 IN-2 层状、似层状 113~244 48~170 128 240 2.83 12 69 0.81~2.26 0.33~0.47 IIN 似层状 132~222 23~102 68 160 1.50 3 60 0.76~3.56 0.62~1.27 
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表 2 南庄铅锌矿床矿石微量元素含量分析数据表
Table 2. Trace element contents in ores from Nanzhuang Pb-Zn deposit
元素 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ∑REE LREE/HREE 浸染状矿石 10.3 23.0 3.24 10.8 3.02 1.52 2.92 0.56 3.79 0.68 2.04 0.30 2.02 0.34 16.0 64.5 4.41 块状矿石 6.43 13.1 1.32 5.62 0.77 1.56 1.38 0.24 1.55 0.29 0.74 0.11 0.80 0.12 6.66 34.0 5.51 角砾状矿石 3.19 4.04 0.48 0.60 0.18 0.19 0.33 0.17 0.41 0.11 0.20 0.03 0.40 0.02 0.90 10.4 5.20 元素 Cu Pb Zn Au Ag As Sb Ba W Mo Co Cd Sr S δCe δEu (La/Yb)N 浸染状矿石 0.09 0.51 1.12 0.19 36.4 3.46 7.64 32.1 1.47 14.2 17.4 177 353 5.71 0.97 1.56 3.66 块状矿石 0.12 0.68 1.94 0.23 54.3 3.33 8.92 46.8 2.57 62.5 22.0 1000 202 17.3 0.71 4.63 5.77 角砾状矿石 0.05 0.39 0.82 0.13 21.6 2.70 16.9 21.7 1.14 51.1 20.6 83.0 649 5.9 0.76 1.63 5.83 测试单位: 南京大学地科系中心实验室.含量单位: 比值及δ值为1;Cu、Pb、Zn、Ba、S为%; 其余为10-6.
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