Metallogenic stages and chronology of the Xijiazhuang gold-lead-zinc polymetallic deposit in Mengcheng, Anhui Province
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摘要:
西贾庄金铅锌多金属矿床是近年来在蚌埠隆起西段新发现的多金属矿床，该矿床的发现实现了皖西北深覆盖区的找矿突破。开展成矿期次及矿区成矿岩体年代学研究，对该矿床的成因、找矿方向及区域成矿规律认识具有重要意义。文章通过详细的野外地质调查和室内镜下鉴定，依据矿物的生成时代、交生关系及围岩蚀变与矿化之间的关系，将金铅锌多金属成矿作用划分为3个成矿期（矽卡岩期、热液期和表生期）和6个成矿阶段（早期无水简单矽卡岩阶段、晚期含水复杂矽卡岩阶段、石英硫化物阶段、早期碳酸盐阶段、晚期碳酸盐阶段和表生阶段），其中石英硫化物阶段和早期碳酸盐阶段是主要的成矿阶段。利用激光剥蚀-电感耦合等离子体质谱（LA-ICP-MS）锆石U-Pb定年方法，获得了矿区主要成矿岩体花岗闪长斑岩和石英二长斑岩的成岩年龄分别为（114.77±0.48） Ma和（113.70±0.51） Ma，表明西贾庄金铅锌多金属矿床形成于早白垩世晚期。
Abstract:The Xijiazhuang gold-lead-zinc polymetallic deposit is a newly discovered polymetallic deposit in the western section of the Bengbu uplift. The prospecting on it has achieved a breakthrough in the deep covered areas of the northwest Anhui. The study of the metallogenic stages and chronology of ore-forming rock mass of the Xijiazhuang deposit is of great significance for understanding the genesis, prospecting direction, and regional metallogenic regularity of this deposit. Through detailed field geological observation and microscopic identification, this paper divided the mineralization of gold-lead-zinc polymetallic deposits into three mineralization periods (skarn period, hydrothermal period, and supergene period) and six mineralization sub-stages (early anhydrous simple skarn stage, late water-bearing complex skarn stage, quartz sulfide stage, early carbonate stage, late carbonate stage, and supergene stage) according to their genesis epoch, intergeneration and the relation between host-rock alteration and mineralization, among which the quartz sulfide stage and early carbonate stage are the main. Utilizing the zircon LA-ICP-MS U-Pb dating, the ages of the major ore-forming rocks such as granodiorite porphyry and quartz monzonite porphyry in the mining area are determined to be (114.77±0.48) Ma and (113.70±0.51) Ma respectively, which indicate that it is the product of the early Cretaceous magmatism .
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表 1 西贾庄矿床成矿期与成矿阶段划分表
Table 1. Division of mineralization periods and stages in Xijiazhuang deposit
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表 2 西贾庄矿区岩浆岩锆石U-Pb同位素测年数据表
Table 2. Zircon U-Pb isotope dating data for magmatic rocks in Xijiazhuang mining area
点号 含量/10−6 同位素比值 年龄/Ma Pb Th U $ \dfrac{{\mathrm{TH}}}{{\mathrm{U}}}$ $\dfrac{^{207}{\mathrm{Pb}}}{^{206}{\mathrm{Pb}}} $ 1σ $\dfrac{^{207}{\mathrm{Pb}}}{^{235}{\mathrm{U}}} $ 1σ $\dfrac{^{206}{\mathrm{Pb}}}{^{238}{\mathrm{U}}} $ 1σ $\dfrac{^{206}{\mathrm{Pb}}}{^{238}{\mathrm{U}}} $ 1σ 样品2033-GS1 01 8.26 239.75 374.08 0.64 0.0486 0.0018 0.1182 0.0040 0.0179 0.0003 114.5 2.0 02 7.20 217.33 318.52 0.68 0.0492 0.0022 0.1225 0.0056 0.0181 0.0003 115.3 1.8 03 7.21 189.50 327.98 0.58 0.0482 0.0021 0.1188 0.0055 0.0179 0.0003 114.6 1.9 04 9.12 259.83 410.04 0.63 0.0488 0.0019 0.1218 0.0049 0.0180 0.0003 114.8 1.9 05 5.89 169.41 263.08 0.64 0.0486 0.0023 0.1177 0.0049 0.0179 0.0003 114.2 2.1 07 7.63 222.00 343.91 0.65 0.0483 0.0021 0.1210 0.0053 0.0180 0.0003 114.7 1.8 08 7.74 216.45 346.89 0.62 0.0498 0.0020 0.1229 0.0048 0.0181 0.0003 115.3 2.0 10 7.96 190.84 376.52 0.51 0.0488 0.0021 0.1187 0.0050 0.0178 0.0003 113.7 1.9 12 7.55 237.65 329.29 0.72 0.0494 0.0020 0.1199 0.0046 0.0178 0.0003 113.4 1.6 14 7.14 172.74 326.78 0.53 0.0485 0.0022 0.1203 0.0047 0.0182 0.0003 116.0 2.0 17 8.32 235.10 368.16 0.64 0.0486 0.0025 0.1205 0.0062 0.0180 0.0003 115.2 2.1 18 6.46 163.68 292.05 0.56 0.0498 0.0025 0.1209 0.0053 0.0180 0.0003 115.0 2.1 20 8.46 237.61 373.13 0.64 0.0498 0.0025 0.1217 0.0051 0.0181 0.0003 115.5 2.0 21 6.74 198.50 301.88 0.66 0.0518 0.0025 0.1241 0.0058 0.0177 0.0003 113.0 1.8 22 9.20 243.26 424.34 0.57 0.0496 0.0019 0.1216 0.0048 0.0179 0.0003 114.3 1.8 23 10.55 282.48 473.99 0.60 0.0472 0.0016 0.1198 0.0043 0.0184 0.0003 117.4 1.9 样品205-GS1 01 7.71 225.69 356.75 0.63 0.0475 0.0021 0.1155 0.0050 0.0178 0.0003 113.6 1.8 02 8.31 266.47 374.37 0.71 0.0486 0.0018 0.1202 0.0043 0.0178 0.0003 113.6 1.7 03 8.03 253.60 353.24 0.72 0.0481 0.0020 0.1190 0.0046 0.0179 0.0003 114.5 1.8 04 7.35 205.10 333.24 0.62 0.0492 0.0021 0.1219 0.0050 0.0177 0.0003 113.2 1.7 05 7.06 237.75 309.70 0.77 0.0479 0.0022 0.1189 0.0046 0.0178 0.0003 113.8 2.0 07 9.45 320.58 414.58 0.77 0.0493 0.0019 0.1206 0.0040 0.0177 0.0003 113.0 1.8 09 5.35 154.48 239.06 0.65 0.0505 0.0028 0.1222 0.0061 0.0177 0.0003 113.1 2.1 10 8.94 281.56 401.19 0.70 0.0487 0.0021 0.1208 0.0044 0.0178 0.0003 113.6 1.9 11 7.24 207.62 326.52 0.64 0.0476 0.0018 0.1208 0.0045 0.0179 0.0003 114.2 1.9 12 7.80 235.83 342.68 0.69 0.0498 0.0027 0.1230 0.0059 0.0179 0.0003 114.1 2.1 15 6.38 173.47 289.09 0.60 0.0485 0.0021 0.1191 0.0049 0.0178 0.0003 113.5 1.8 17 3.34 120.63 134.81 0.89 0.0484 0.0037 0.1208 0.0091 0.0179 0.0004 114.5 2.6 18 6.26 213.06 256.75 0.83 0.0505 0.0031 0.1236 0.0071 0.0177 0.0004 113.1 2.6 20 6.05 166.33 268.77 0.62 0.0494 0.0025 0.1214 0.0064 0.0178 0.0004 114.0 2.3 25 8.06 235.32 364.39 0.65 0.0501 0.0019 0.1213 0.0043 0.0179 0.0003 114.1 1.9
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