Ore and rock forming ages, geochemical, mineralogical characteristics of Shuikoushan ore field and its indicating significance for Pb-Zn polymetallic mineralization, Hunan Province
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摘要:
本文报道水口山矿田花岗闪长岩和英安玢岩的矿物学、同位素年代学、岩石地球化学和Sr-Nd同位素资料。电子探针分析结果显示, 花岗闪长岩中黑云母为富镁黑云母, 斜长石主要为中长石, 而英安玢岩中斜长石成分为奥-钠长石。锆石U-Pb定年结果显示, 英安玢岩形成于148.8±0.5 Ma, 较花岗闪长岩晚近10 Ma。石榴子石原位U-Pb定年结果显示, 康家湾矿区深部矽卡岩形成于159.1±1.9 Ma, 与花岗闪长岩形成时代一致。地球化学特征显示, 水口山岩浆岩均具有富Al、低Si、高K/Na值特征, 为亚碱性、高钾钙碱性-钾玄岩系列岩石。各类岩石富集Rb、Th、U, 亏损Ba、Nb、Sr、Ti等。Sr-Nd同位素特征显示, 花岗闪长岩和英安玢岩的(87Sr/86Sr)i值分别为0.70661~0.70801和0.71116~0.711156, εNd(t)值分别为-7.4~-2.4和-8.63~-7.1, TDM2值分别为1.55~1.15 Ga和1.64~1.53 Ga, 揭示英安玢岩和花岗闪长岩来自中元古代中下地壳变质杂砂岩-玄武质英云闪长岩的部分熔融, 为不同期次不同深度岩浆作用的产物。成岩成矿时代、地球化学特征和矿物学特征综合表明, 花岗闪长岩与水口山多金属成矿作用关系密切, 且整个水口山矿田形成于燕山期早期晚阶段古太平洋板块俯冲背景下的陆内伸展环境。
Abstract:We reported systematic mineralogical, geochronological, geochemical and Sr-Nd isotopic data of granodiorite and dacite porphyry in Shuikoushan ore field.The EMPA analysis result shows that the biotite in granodiorite is magnesium-rich biotite and the plagioclase is main andesine, while the plagioclase in dacite porphyry is main oligoclase-albite.Zircon U-Pb age shows that the dacite porphyry was formed at 148.8±0.5 Ma, which is about 10 Ma later than the granodiorite.However, the in situ U-Pb age of garnet shows that the deep skarn of Kangjiawan deposit was formed at 159.1±1.9 Ma, which is much closer to the formation age of granodioritie.Geochemical characteristics shows that the magmatic rocks in Shuikoushan are enriched in Al, low in Si and high in K/Na ratio, and have the affinity of subalkaline and high K calc-alkaline to shoshonite series.They are enriched in Rb, Th, U and depleted in Ba, Nb, Sr, Ti, etc.Sr-Nd isotopic characteristics show that the(87Sr/86Sr)i ratios range from 0.70661 to 0.70801 and 0.71116 to 0.711156 for granodiorite and dacite porphyry, respectively.The calculated εNd(t)values range from-7.4~-2.4 and-7.1 to-8.63 for granodiorite and dacite porphyry, respectively.The TDM2 values of granodiorite range from 1.53 Ga to 1.15 Ga and of dacite porphyry are from 1.64 Ga to 1.53 Ga.It suggests that the granodiorite and dacite porphyry were derived from partial melting of Mesoproterozoic metamorphic basaltic tonalite diorite.They are formed at the different stages of magmatism and derived from distinct source regions.The evidence of formation ages, geochemical characteristics and mineralogical characteristics suggest the affinity between granodiorite and polymetallic mineralization.The Shuikoushan ore field was formed in the intracontinental extensional setting under the subduction background of paleo-Pacific plate at the late stage of early Yanshanian.
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Key words:
- Shuikoushan /
- geochronology /
- granodiorite /
- extension /
- mineralization /
- geological survey engineering
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图 6 水口山矿田岩浆岩TAS图解(a)和SiO2-K2O图解(b)(虚线圈为花岗闪长岩区域，实线圈为英安玢岩区域，其余点位受热液蚀变影响分散；部分花岗闪长岩和英安玢岩数据据Yang et al., 2006；马丽艳等，2006；黄金川等，2015；左昌虎，2015)
Figure 6.
图 14 水口山花岗闪长岩和英安玢岩Yb-Ta(a)和Y-Nb判别图解(b)(底图据Pearce et al., 1984)
Figure 14.
表 1 水口山矿田英安玢岩锆石U-Th-Pb及石榴子石原位U-Pb测试结果
Table 1. U-Th-Pb analysis results of zircon grains for dacite porphyry and in situ U-Pb results of garnet from Shuikoushan ore field
测点 元素含量/10-6 同位素比值 同位素年龄/Ma Th U Pb 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 英安玢岩锆石 HNSKS-2-1 355 454 16.3 0.0495 0.0014 0.1578 0.0039 0.0232 0.0004 169.1 62.4 148.8 3.4 147.5 2.7 HNSKS-2-2 520 578 23.6 0.0489 0.0012 0.157 0.0036 0.0233 0.0004 144.3 57.8 148.1 3.1 148.3 2.7 HNSKS-2-3 204 406 11.5 0.049 0.0012 0.1574 0.0036 0.0233 0.0004 145.8 58.2 148.4 3.2 148.6 2.7 HNSKS-2-4 262 420 13.6 0.0502 0.0014 0.1599 0.0039 0.0231 0.0004 202.4 61.3 150.6 3.4 147.3 2.7 HNSKS-2-5 194 337 10.9 0.0494 0.0017 0.1591 0.0051 0.0233 0.0005 168.8 77.9 149.9 4.4 148.7 2.8 HNSKS-2-6 224 461 12.2 0.05 0.0017 0.1607 0.0049 0.0233 0.0005 193.9 75.2 151.3 4.3 148.6 2.8 HNSKS-2-7 132 250 7.3 0.0497 0.0016 0.1600 0.0048 0.0233 0.0004 182 73.5 150.7 4.2 148.8 2.8 HNSKS-2-8 265 443 13.5 0.0487 0.0014 0.1569 0.004 0.0234 0.0004 131.3 63.9 148 3.5 149.1 2.7 HNSKS-2-9 193 419 11.2 0.0506 0.0015 0.1603 0.0043 0.023 0.0004 220.9 65.6 150.9 3.7 146.5 2.7 HNSKS-2-10 283 539 16.4 0.0487 0.0013 0.1571 0.0037 0.0234 0.0004 134.8 60.3 148.1 3.3 149 2.7 HNSKS-2-11 307 440 16.5 0.0495 0.0013 0.1599 0.0039 0.0234 0.0004 170.4 61.7 150.6 3.4 149.4 2.7 HNSKS-2-12 401 636 22.1 0.0501 0.0013 0.1607 0.0038 0.0233 0.0004 198.7 58.6 151.3 3.3 148.3 2.7 HNSKS-2-13 243 428 14.0 0.049 0.002 0.1579 0.0061 0.0233 0.0005 149.8 93.1 148.8 5.3 148.8 3 HNSKS-2-14 181 432 11.4 0.0496 0.0014 0.1587 0.004 0.0232 0.0004 176.9 63.4 149.6 3.5 147.9 2.7 HNSKS-2-15 175 410 11.6 0.0498 0.0015 0.1602 0.0045 0.0234 0.0004 183.6 69.2 150.9 3.9 148.8 2.8 HNSKS-2-16 236 429 13.8 0.0502 0.0014 0.1622 0.0042 0.0234 0.0004 204.1 64.4 152.7 3.7 149.4 2.7 HNSKS-2-17 262 425 14.5 0.0488 0.0013 0.1573 0.0037 0.0234 0.0004 136.4 59.5 148.4 3.2 149.1 2.7 HNSKS-2-18 619 897 32.8 0.0497 0.0014 0.1582 0.004 0.0231 0.0004 178.4 62.5 149.2 3.5 147.3 2.7 HNSKS-2-19 260 358 14.1 0.0497 0.0019 0.1598 0.0057 0.0233 0.0005 181.7 86.5 150.5 5 148.6 2.9 HNSKS-2-20 332 596 20.0 0.0493 0.0015 0.1581 0.0045 0.0233 0.0004 161.2 70.1 149 3.9 148.2 2.8 HNSKS-2-21 232 370 13.3 0.0482 0.0012 0.1559 0.0036 0.0235 0.0004 107.5 58.5 147.1 3.1 149.6 2.7 HNSKS-2-22 153 349 9.6 0.0495 0.0014 0.1591 0.0041 0.0233 0.0004 171.4 63.5 149.9 3.6 148.5 2.7 HNSKS-2-23 267 460 15.6 0.0489 0.0013 0.1571 0.0037 0.0233 0.0004 142.4 59.5 148.2 3.2 148.5 2.7 HNSKS-2-24 267 443 15.7 0.0489 0.0014 0.1586 0.0043 0.0235 0.0004 143.2 67.8 149.5 3.8 149.9 2.8 HNSKS-2-25 594 1043 35.2 0.0487 0.0012 0.1577 0.0036 0.0235 0.0004 135.5 57.7 148.7 3.1 149.5 2.7 HNSKS-2-26 314 442 16.8 0.0494 0.0017 0.1599 0.005 0.0235 0.0005 167.3 76.5 150.6 4.4 149.5 2.9 HNSKS-2-27 107 255 6.9 0.0491 0.0017 0.1578 0.005 0.0233 0.0005 151.6 78.3 148.8 4.4 148.6 2.8 HNSKS-2-28 158 281 9.2 0.0489 0.0021 0.1584 0.0065 0.0235 0.0005 145.0 98.3 149.3 5.7 149.5 3.1 HNSKS-2-29 175 377 11.0 0.0485 0.0013 0.1573 0.0037 0.0235 0.0004 124.4 59.6 148.4 3.2 149.9 2.7 康家湾石榴子石 114CK-03-7-13 0.04 0.44 15.9 0.06 0.01 0.17 0.02 0.03 0 672.2 190.7 158.8 14.5 160.0 12.0 114CK-03-7-12 0.09 0.31 5.50 0.15 0.02 0.39 0.06 0.03 0 2320.1 147.9 337.6 44.4 160.7 9.1 114CK-03-7-10 0.10 0.20 9.90 0.09 0.01 0.24 0.02 0.03 0 1450.0 158.8 220.2 14.4 161.2 4.9 114CK-03-7-5 0.22 0.00 11.0 0.09 0.01 0.5 0.12 0.03 0 1435.2 219.8 415.0 78.3 172.5 10.6 114CK-03-7-3 0.28 0.71 14.2 0.1 0.01 0.69 0.16 0.03 0 1701.9 163.3 532.6 94.9 184.8 13.2 114CK-03-7-2 0.37 0.09 14.6 0.11 0.01 0.79 0.19 0.03 0 1783.3 142.3 592.1 106.6 199.1 15.8 114CK-03-7-1 0.52 0.98 13.0 0.13 0.01 0.91 0.22 0.03 0 2110.2 112.0 657.2 116.1 207.8 20.4 114CK-03-7-4 1.23 1.08 12.4 0.3 0.03 4.77 0.54 0.09 0.01 3471.3 100.9 1779.3 95.2 561.1 46.1 114CK-03-7-6 0.05 0.03 12.6 0.06 0.01 0.17 0.02 0.02 0 531.5 236.9 159.0 19.8 148.7 5.2 114CK-03-7-8 0.03 0.32 13.9 0.05 0.01 0.16 0.02 0.02 0 353.8 237.8 152.5 19.3 153.6 5.2 114CK-03-7-9 0.04 0.28 12.9 0.06 0.01 0.17 0.02 0.02 0 505.6 348.9 158.3 17.9 157.3 4.3 114CK-03-7-11 0.02 0.02 9.00 0.05 0.01 0.13 0.01 0.02 0 33.4 276.7 122.4 12.8 158.8 8.8 114CK-03-7-7 0.04 0.23 14.7 0.04 0.01 0.11 0.02 0.02 0 error 198.3 107.4 14.4 157.5 6.6 
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表 2 水口山岩浆岩地球化学分析结果
Table 2. Geochemistry analysis results of magmatic rocks from Shuikoushan
元素 英安玢岩 花岗闪长岩 HNSKS-2 HNSKS-3 HNSKS-4 SKS-1 SKS-2 SKS-3 SKS-4 SKS-5 SKS-6 SKS-7 SiO2 62.9 62.7 62.9 63.4 55.7 61.1 57.7 60.1 55.6 56.0 TiO2 0.61 0.62 0.62 0.78 0.59 0.83 0.69 0.62 0.62 0.65 Al2O3 15.8 15.7 15.9 15.9 12.4 16.2 14.1 14.1 13.4 13.6 Fe2O3 4.09 3.39 3.47 2.62 6.65 2.46 3.49 4.22 7.35 5.36 FeO 1.55 1.94 2.09 2.38 1.70 3.01 2.52 1.89 1.75 2.09 MnO 0.11 0.09 0.09 0.04 0.06 0.06 0.06 0.05 0.05 0.07 MgO 1.70 1.85 1.90 2.70 2.17 3.16 2.68 2.08 1.60 1.69 CaO 2.12 1.78 2.12 1.56 5.18 1.93 5.04 3.61 4.34 5.56 Na2O 3.63 4.41 2.95 0.16 0.22 0.17 0.16 0.31 0.17 0.11 K2O 4.40 4.26 3.19 4.14 3.78 3.93 3.99 4.24 2.76 1.87 P2O5 0.32 0.32 0.33 0.41 0.32 0.45 0.36 0.34 0.33 0.36 烧失量 2.31 2.38 4.08 5.77 10.64 6.36 8.88 8.03 11.33 11.89 ALK 8.03 8.67 6.14 4.30 4.00 4.10 4.15 4.54 2.93 1.98 K/Na 1.21 0.97 1.08 25.6 17.3 22.9 25.3 13.8 16.6 17.7 Mg# 0.66 0.63 0.62 0.67 0.70 0.65 0.66 0.66 0.62 0.59 La 41.1 40.1 45.8 25.6 50.7 31.5 38.6 38.0 35.6 36.1 Ce 79.5 77.4 84.8 52.3 96.0 63.6 73.5 73.8 68.6 72.4 Pr 11.0 10.5 11.3 7.40 12.9 8.55 9.82 10.14 9.47 9.96 Nd 38.0 37.5 39.8 26.5 45.8 30.7 36.0 36.2 34.1 36.2 Sm 6.90 6.95 7.21 5.42 8.67 5.84 6.95 6.98 6.52 7.05 Eu 1.83 1.78 1.86 1.26 2.36 1.44 1.95 1.97 1.69 1.91 Gd 5.53 5.40 5.58 4.22 6.97 4.43 5.62 5.58 5.11 5.51 Tb 1.00 0.98 1.01 0.81 1.25 0.81 1.06 1.06 0.95 1.05 Dy 4.93 4.88 5.02 4.07 6.42 4.05 5.33 5.36 4.68 5.45 Ho 0.96 0.93 0.96 0.78 1.22 0.77 1.03 1.03 0.88 1.05 Er 2.67 2.62 2.77 2.24 3.51 2.18 2.87 2.99 2.56 3.02 Tm 0.39 0.41 0.41 0.34 0.54 0.33 0.42 0.46 0.38 0.45 Yb 2.45 2.40 2.47 2.05 3.26 2.07 2.57 2.81 2.39 2.81 Lu 0.37 0.37 0.40 0.32 0.52 0.32 0.42 0.45 0.39 0.44 Y 24.5 23.2 25.3 19.0 31.6 18.4 24.8 25.7 21.6 25.0 ΣREE 197 192 210 133 240 156 186 187 173 183 LREE 178 174 191 118 217 142 167 167 156 164 HREE 18.3 18.0 18.6 14.8 23.7 15.0 19.3 19.7 17.3 19.8 LREE/HREE 9.75 9.69 10.25 7.99 9.14 9.48 8.64 8.47 9.00 8.28 (La/Yb)N 12.0 12.0 13.3 8.94 11.2 11.0 10.8 9.70 10.7 9.23 δEu 0.88 0.85 0.87 0.77 0.90 0.83 0.92 0.93 0.86 0.90 δCe 0.90 0.90 0.89 0.92 0.90 0.93 0.90 0.90 0.90 0.92 Bi 15.62 0.61 0.12 2.85 0.48 0.86 0.64 1.04 0.35 0.22 Mo 1.53 0.52 0.52 16.4 3.45 1.41 3.91 1.75 3.10 5.73 Cu 722 26.0 33.9 224 142 231 114 292 453 80.9 Ga 20.0 15.0 17.4 18.2 20.8 17.4 10.8 17.6 16.0 14.3 As 103 20.5 3.07 21.3 12.8 2.84 2.06 2.64 2.35 2.56 In 1.86 0.84 0.06 0.43 0.19 0.04 0.03 0.06 0.05 0.02 Ni 20.4 6.48 10.8 7.6 15.2 10.5 9.95 8.90 12.3 8.32 Pb 12.2 5.99 45.1 22.9 18.5 13.1 14.3 13.6 14.1 18.3 Rb 42.6 30.9 162 176 143 174 163 164 171 167 Sr 202 25.9 475 361 83.0 80.1 71.9 111 112 121 Ba 243 52.9 1347 839 139 623 1458 732 855 635 Sb 5.93 0.89 0.32 12.7 1.71 1.01 0.60 0.74 0.70 0.67 Sc 10.6 11.3 12.9 19.8 18.9 14.7 12.9 15.9 15.3 14.1 W 1.70 0.77 1.26 0.89 4.86 3.18 3.27 1.40 1.30 2.65 Sn 24.6 22.6 1.93 12.7 7.81 3.61 5.90 3.80 3.46 2.73 Nb 12.5 11.2 20.4 18.0 19.2 15.0 9.80 15.3 14.4 10.4 Ta 1.12 0.89 1.37 1.24 1.27 1.33 0.86 1.38 1.06 1.04 Th 10.8 7.81 12.9 8.83 11.3 14.1 11.2 13.0 11.9 16.3 Tl 0.36 0.25 0.66 1.12 2.70 1.24 0.98 1.07 1.17 1.06 U 5.70 4.02 2.41 3.38 2.75 3.04 4.43 2.52 2.24 3.66 V 194 186 97.6 155 184 136 115 148 130 116 Zn 105 203 139 53.6 226 40.5 30.2 56.6 43.9 44.5 Zr 133 144 187 227 182 184 136 199 144 151 Hf 4.06 3.77 5.14 6.43 5.27 5.64 3.90 5.88 4.49 4.63 注：主量元素含量单位为%，微量和稀土元素含量单位为10-6
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表 3 水口山矿田岩浆岩中黑云母化学成分
Table 3. Chemical component of biotite in magmatic rocks from Shuikoushan ore field
样品号 SKS1-1-1 SKS1-1-2 SKS1-1-3 SKS1-2-1 SKS1-2-2 SKS1-2-3 SKS4-1-1 SKS4-1-2 SKS4-1-3 SiO2 37.9 37.7 36.5 37.8 36.7 36.9 37.7 37.0 36.5 TiO2 2.92 3.48 3.17 3.09 3.81 3.68 3.79 3.66 4.25 Al2O3 14.3 14.1 13.8 14.3 14.1 14.5 14.0 14.3 14.7 FeO 16.6 16.2 16.8 15.0 16.8 16.3 16.2 15.9 16.3 MnO 0.09 0.13 0.07 0.12 0.11 0.15 0.14 0.07 0.08 MgO 13.4 13.3 13.2 13.2 13.3 13.0 12.4 13.2 13.1 CaO 0.02 0.07 0.01 0.11 0.00 0.00 0.06 0.04 0.01 Na2O 0.37 0.68 0.29 0.46 0.29 0.28 0.62 0.41 0.29 K2O 9.78 9.85 10.03 9.49 10.14 10.09 10.08 10.14 9.96 F 0.75 0.63 0.59 0.52 0.62 0.74 0.62 0.80 0.61 Si 2.83 2.82 2.80 2.86 2.77 2.78 2.84 2.79 2.75 AlⅣ 1.17 1.18 1.20 1.14 1.23 1.22 1.16 1.21 1.25 AlⅥ 0.09 0.06 0.05 0.14 0.02 0.07 0.08 0.06 0.05 Ti 0.16 0.20 0.18 0.18 0.22 0.21 0.21 0.21 0.24 Fe3+ 0.22 0.19 0.16 0.25 0.18 0.22 0.22 0.21 0.21 Fe2+ 0.82 0.82 0.91 0.71 0.88 0.81 0.80 0.79 0.82 Mn 0.01 0.01 0.00 0.01 0.01 0.01 0.01 0.00 0.01 Mg 1.49 1.48 1.50 1.49 1.50 1.46 1.39 1.48 1.47 Ca 0.00 0.01 0.00 0.01 0.00 0.00 0.01 0.00 0.00 Na 0.05 0.10 0.04 0.07 0.04 0.04 0.09 0.06 0.04 K 0.93 0.94 0.98 0.92 0.98 0.97 0.97 0.97 0.96 总计 7.78 7.81 7.84 7.75 7.82 7.78 7.78 7.79 7.79 OH- 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 MF 0.59 0.59 0.58 0.61 0.58 0.58 0.57 0.60 0.59 AlⅥ+Fe3++Ti 0.48 0.45 0.39 0.56 0.42 0.50 0.52 0.48 0.50 Fe2++Mn 0.82 0.83 0.91 0.71 0.89 0.82 0.81 0.79 0.82 Ti/(Mg+Fe+Ti+Mn) 0.06 0.07 0.07 0.07 0.08 0.08 0.08 0.08 0.09 Al/(Al+Mg+Fe+Ti+Mn+Si) 0.19 0.18 0.18 0.19 0.18 0.19 0.18 0.19 0.19 样品号 SKS4-3-1 SKS4-3-2 SKS4-3-3 SKS4-2-1 SKS4-2-2 SKS-2-1 SKS-2-2 SKS-3-1 SKS-3-2 SiO2 36.4 36.3 36.6 36.9 35.9 37.8 37.2 37.2 36.8 TiO2 3.29 3.49 3.37 3.15 3.79 2.66 3.26 3.21 2.51 Al2O3 14.2 13.9 14.3 14.2 14.4 17.1 15.5 15.2 16.7 FeO 16.2 16.0 15.9 16.6 16.5 15.5 14.2 15.6 15.9 MnO 0.08 0.18 0.09 0.21 0.05 0.19 0.17 0.08 0.13 MgO 13.3 13.7 12.9 13.7 12.7 12.3 15.2 14.1 13.6 CaO 0.00 0.00 0.01 0.04 0.07 0.07 0.06 0.07 0.10 Na2O 0.20 0.19 0.30 0.32 0.48 0.20 0.28 0.12 0.11 K2O 9.93 9.93 10.1 9.98 9.66 7.08 9.18 8.43 6.69 F 0.71 0.59 0.78 0.59 0.55 1.08 1.71 1.20 1.09 Si 2.78 2.78 2.79 2.78 2.75 2.81 2.72 2.77 2.76 AlⅣ 1.22 1.22 1.21 1.22 1.25 1.19 1.28 1.23 1.24 AlⅥ 0.06 0.03 0.08 0.05 0.06 0.31 0.06 0.10 0.23 Ti 0.19 0.20 0.19 0.18 0.22 0.15 0.18 0.18 0.14 Fe3+ 0.19 0.18 0.21 0.16 0.18 0.49 0.32 0.35 0.44 Fe2+ 0.84 0.85 0.80 0.89 0.88 0.48 0.55 0.63 0.56 Mn 0.01 0.01 0.01 0.01 0.00 0.01 0.01 0.00 0.01 Mg 1.52 1.56 1.47 1.54 1.45 1.37 1.66 1.57 1.52 Ca 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.01 0.01 Na 0.03 0.03 0.04 0.05 0.07 0.03 0.04 0.02 0.02 K 0.97 0.97 0.98 0.96 0.95 0.67 0.86 0.80 0.64 总计 7.81 7.82 7.79 7.84 7.82 7.51 7.68 7.65 7.56 OH- 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 MF 0.59 0.60 0.59 0.59 0.58 0.58 0.65 0.62 0.60 AlⅥ+Fe3++Ti 0.44 0.41 0.49 0.38 0.46 0.95 0.56 0.63 0.81 Fe2++Mn 0.85 0.86 0.80 0.90 0.88 0.49 0.56 0.63 0.57 Ti/(Mg+Fe+Ti+Mn) 0.07 0.07 0.07 0.06 0.08 0.06 0.07 0.07 0.05 Al/(Al+Mg+Fe+Ti+Mn+Si) 0.19 0.18 0.19 0.18 0.19 0.22 0.20 0.19 0.21 注：主量元素含量单位为%；黑云母原子量是以22个O原子为基准进行计算
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表 4 水口山矿田岩浆岩中斜长石化学成分
Table 4. Chemical component of plagioclase of magmatic rocks from Shuikoushan ore field
样品号 H-1 H-2 H-3 H-4 H-5 H-6 H-7 SiO2 57.9 59.1 59.6 57.1 57.3 56.1 55.6 Al2O3 26.8 25.5 24.4 26.3 26.1 27.0 26.9 CaO 8.65 7.72 7.06 9.01 8.47 9.58 9.65 Na2O 5.52 6.96 7.29 6.22 6.58 5.62 5.73 K2O 0.49 0.14 0.24 0.10 0.19 0.15 0.17 BaO 0.05 0.00 0.07 0.04 0.00 0.00 0.04 Si 2.60 2.65 2.69 2.59 2.60 2.55 2.54 Al 1.42 1.35 1.30 1.40 1.40 1.45 1.45 Ca 0.42 0.37 0.34 0.44 0.41 0.47 0.47 Na 0.48 0.61 0.64 0.55 0.58 0.50 0.51 K 0.03 0.01 0.01 0.01 0.01 0.01 0.01 Ba 0.00 0.00 0.00 0.00 0.00 0.00 0.00 An 45.0 37.7 34.4 44.2 41.1 48.1 47.7 Ab 52.0 61.5 64.2 55.2 57.8 51.0 51.3 Or 3.02 0.81 1.41 0.57 1.08 0.90 1.02 样品号 H-8 H-9 H-10 H-11 H-12 H-13 H-14 SiO2 57.6 57.0 65.6 65.7 62.1 57.1 56.6 Al2O3 26.0 26.4 22.2 20.7 23.1 26.4 26.5 CaO 8.87 9.01 0.95 0.28 4.06 9.04 8.69 Na2O 6.29 5.80 9.55 11.70 8.54 6.04 6.45 K2O 0.22 0.17 0.98 0.14 0.60 0.23 0.12 BaO 0.00 0.00 0.01 0.00 0.01 0.00 0.01 Si 2.61 2.59 2.89 2.92 2.79 2.59 2.58 Al 1.38 1.41 1.15 1.09 1.22 1.41 1.42 Ca 0.43 0.44 0.04 0.01 0.20 0.44 0.42 Na 0.55 0.51 0.82 1.01 0.74 0.53 0.57 K 0.01 0.01 0.06 0.01 0.03 0.01 0.01 Ba 0.00 0.00 0.00 0.00 0.00 0.00 0.00 An 43.2 45.7 4.89 1.30 20.1 44.6 42.4 Ab 55.5 53.2 89.1 97.9 76.4 54.0 56.9 Or 1.30 1.05 6.01 0.79 3.53 1.35 0.69 样品号 H-15 Y-1 Y-2 Y-3 Y-4 Y-5 Y-6 SiO2 57.2 66.2 66.1 66.2 66.0 67.7 67.5 Al2O3 25.5 21.3 21.7 21.8 21.3 20.6 20.5 CaO 7.58 0.84 1.56 1.54 0.65 0.11 0.08 Na2O 6.92 10.9 10.6 10.8 10.3 10.4 9.45 K2O 0.39 0.04 0.05 0.04 0.04 0.04 0.03 BaO 0.07 0.01 0.02 0.00 0.00 0.00 0.01 Si 2.62 2.92 2.90 2.89 2.93 2.98 2.99 Al 1.38 1.11 1.12 1.12 1.11 1.07 1.07 Ca 0.37 0.04 0.07 0.07 0.03 0.01 0.00 Na 0.61 0.93 0.90 0.91 0.88 0.88 0.81 K 0.02 0.00 0.00 0.00 0.00 0.00 0.00 Ba 0.00 0.00 0.00 0.00 0.00 0.00 0.00 An 36.9 4.07 7.49 7.29 3.36 0.59 0.45 Ab 60.9 95.7 92.3 92.5 96.4 99.1 99.3 Or 2.26 0.24 0.26 0.22 0.27 0.27 0.21 注：主量元素含量单位为%
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表 5 水口山矿田岩浆岩Sr-Nd同位素分析结果
Table 5. The Sr-Nd isotope analytical result for magmatic rocks of Shuikoushan ore field
样品号 成岩时代/Ma 岩性 87Sr/86Sr ISr 143Nd/144Nd εNd(t) TDM2/Ma 来源 SKS-6 156 花岗闪长岩 0.711854 0.710128 0.512231 -6.29 1457 黄金川等, 2015 SKS-31 156 花岗闪长岩 0.71182 0.710124 0.512255 -5.95 1430 SKS-32 156 花岗闪长岩 0.715479 0.707364 0.512434 -2.40 1142 SKS-36 156 花岗闪长岩 0.711845 0.710161 0.512241 -6.14 1445 SKS-50 156 花岗闪长岩 0.711867 0.710111 0.512248 -5.96 1430 SHKSH-1* 156 花岗闪长岩 0.721045 0.709788 0.512253 -6.34 1462 SHKSH-3* 156 花岗闪长岩 0.723729 0.71138 0.512219 -6.61 1483 SHKSH-7* 156 花岗闪长岩 0.711467 0.7097 0.512272 -6.21 1451 SHKSH-9* 156 花岗闪长岩 0.711527 0.709879 0.51228 -6.10 1442 HNSKS-2 148.8 英安玢岩 0.713649 0.71156 0.512152 -7.83 1577 本文 HNSKS-3 148.8 英安玢岩 0.713212 0.71116 0.512133 -8.24 1610 HNSKS-4 148.8 英安玢岩 0.712767 0.71116 0.512111 -8.63 1642 SKS-1 156 花岗闪长岩 0.720943 0.70661 0.512183 -7.40 1549 SKS-2 156 花岗闪长岩 0.722956 0.70801 0.512188 -7.10 1527
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表 6 水口山矿田岩浆岩形成时代
Table 6. The formation age of magmatic rocks in Shuikoushan ore field
样品属性 时代 测年方法 参考文献 花岗闪长岩 143~160.9 Ma 李能强等，1996 花岗闪长岩 172.3±1.9 Ma 锆石U-Pb稀释法 王岳军等，2001 花岗闪长岩4号岩体 163±2 Ma 锆石SHRIMP U-Pb 黄金川等，2015 花岗闪长岩4号岩体 156.0±1 Ma 锆石LA-ICP-MS U-Pb 马丽艳等，2006 花岗闪长岩4号岩体 158.8±1.8 Ma 锆石SIMS U-Pb Yang et al., 2016 花岗闪长岩 158.3±1.2 Ma 锆石LA-ICP-MS U-Pb 左昌虎等，2014 花岗斑岩 143~160.9 Ma 李能强等，1996 英安玢岩、安山质火山角砾岩 127.6~129 Ma K-Ar 李能强等，1996 英安玢岩 156.1±1.7 Ma 锆石LA-ICP-MS U-Pb 左昌虎，2015 英安玢岩-流纹斑岩岩 148.8±0.52 Ma 锆石LA-ICP-MS U-Pb 本文 老鸦巢辉钼矿 157.8±1.4 Ma Re-Os Huang et al., 2015 鸭公塘黄铁矿 140±11 Ma Re-Os Li et al., 2021 康家湾深色闪锌矿 154.6±2.1 Ma Rb-Sr 左昌虎，2015 康家湾浅色闪锌矿 151.7±2.5 Ma Rb-Sr 左昌虎，2015 康家湾石榴子石 159.1±1.9 Ma 石榴子石LA-ICP-MS U-Pb 本文
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