Zircon U-Pb-Hf-O Isotopic Characteristics and Geological Significance of Nannihu and Shibaogou Rock Mass in Luanchuan Ore Concentration Area, Western Henan Province
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摘要:
栾川矿集区位于华北克拉通南缘，区内矿产资源丰富，产出多个大型–超大型斑岩–矽卡岩型钼钨矿床。矿集区内晚中生代岩浆活动频繁，形成多个含矿花岗岩体和斑岩岩株，其成矿差异和成矿潜力的控制因素仍不清楚。笔者以栾川矿集区南泥湖富Mo花岗岩体和石宝沟贫矿岩体为研究对象，基于锆石U-Pb定年和Hf-O同位素研究，揭示其成岩成矿年龄、岩浆源区及成矿指示意义。石宝沟花岗岩和南泥湖岩体的锆石U-Pb年龄分别为（147.5±2.2）Ma和（139.5±1.8）Ma，二者均为燕山期岩浆活动的产物。石宝沟岩体的锆石εHf(t)值为−27.4～−14.51，二阶段模式年龄TDM2值为2.15～2.93 Ga，δ18O值为5.42‰～6.77‰。南泥湖岩体的锆石εHf(t)值为−16.84～−8.04，二阶段模式年龄TDM2值为1.70～2.26 Ga，δ18O值为5.88‰～8.27‰。锆石U-Pb年龄和Hf-O同位素结果表明，在碰撞后造山的局部伸展背景下，石宝沟贫矿岩体岩浆源区源于秦岭造山带加厚下地壳部分熔融，南泥湖富Mo斑岩岩浆具有壳幔混源特征。
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关键词:
- 花岗斑岩 /
- 锆石U-Pb-Hf-O同位素 /
- 岩浆源区 /
- 栾川矿集区
Abstract:The Luanchuan mining area is located at the southern edge of the North China Craton, which is rich in mineral resources and has produced a number of large-sized and super-large porphyry-silica type molybdenum and tungsten deposits. There are frequent magmatic activities in Late Mesozoic, forming several ore-bearing granite bodies and porphyry rock strains, and the controlling factors of their mineralization differences and potentials are still unclear. In this paper, we take the Mo-rich granite body of Nannihu and the ore-poor granite body of Shibaogou in the Luanchuan mining concentration area as the research objects, and based on zircon U-Pb dating and Hf-O isotope study, we reveal the age of their diagenesis and metallogeny, magma source area, and metallogeny indication significance. The zircon U-Pb ages of the Shibaogou rock and the Nannihu rock are (147.5±2.2) Ma and (139.5±1.8) Ma, respectively, and both are the products of Yanshan-age magmatism. The zircon εHf(t) values of the Shibaogou body range from −27.40～−14.51, and the two-stage mode age TDM2 values range from 2.15～2.93 Ga, with δ18O values of 5.42‰ to 6.77‰. The zircon εHf(t) values of the Nannihu body range from −16.84～−8.04, with second-stage mode age TDM2 values ranging from 1.70～2.26 Ga and δ18O values of 5.88‰～8.27‰. The zircon U-Pb ages and Hf-O isotope results indicate that the source area of the Shibaogou ore-poor magma originated from partial melting of the thickened lower crust of the Qinling orogenic belt in the context of localized extensional downstretching of post-collisional orogeny; and that the Mo-rich porphyry magma of the Nannihu is characterized by crust-mantle mixing.
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图 1 秦岭造山带构造格架图（a）和栾川矿集区地质简图（b）（修改自Cao et al., 2015）
Figure 1.
图 4 石宝沟岩体εHf（t）直方图（a）、二阶段模式年龄（TDM2）直方图（b）和南泥湖岩体εHf（t）直方图（c）、二阶段模式年龄（TDM2）直方图（d）
Figure 4.
表 1 石宝沟岩体与南泥湖岩体LA-ICP-MS锆石U-Pb年龄鉴定结果表
Table 1. LA-ICP-MS Ziron U-Pb isotopic analysis of Shibaogou and Nannihu pluton
样品 U（10−6） Th（10−6） Pb（10−6） Th/U 206Pb/238U 207Pb/235U 207Pb/206Pb 207Pb/235Pb（Ma） 1σ 206Pb/238Pb（Ma） 1σ 207Pb/206Pb（Ma） 1σ SBG-G02 1 1887 891 70.2 2.13 0.02383 0.1709 0.0515 160.1 4.1 151.8 1.8 255 57 2 1015 512 35.8 1.98 0.02226 0.1608 0.0521 151.4 5.1 141.9 1.9 293 89 3 765 509 31.1 1.56 0.02284 0.2000 0.0642 185.0 9.8 145.6 2.5 710 120 5 1304 723 46.1 1.82 0.02154 0.1659 0.0559 155.8 5.0 137.4 2.1 431 81 6 1239 695 49.9 1.77 0.02212 0.1535 0.0498 144.9 4.1 141.0 1.7 177 71 8 1368 705 49.2 1.94 0.02311 0.1529 0.0478 145.5 5.0 147.3 2.0 103 81 9 386 350 25.3 1.15 0.02288 0.1810 0.0582 171.0 11 145.8 2.2 520 150 10 1027 553 40.7 1.85 0.02247 0.1613 0.0517 151.7 5.3 143.2 1.7 263 73 11 1429 1061 77.0 1.35 0.02358 0.1593 0.0502 150.0 4.3 150.2 1.6 198 64 12 914 1090 84.0 0.86 0.02408 0.1771 0.0530 165.4 6.1 153.4 1.4 329 91 13 1320 765 55.7 1.71 0.02403 0.1631 0.0497 153.3 4.3 153.1 1.5 174 68 14 1196 484 36.3 2.44 0.02375 0.1612 0.0492 151.7 4.9 151.3 1.9 148 80 15 1530 3500 236 0.85 0.02300 0.1645 0.0531 154.5 5.7 146.6 2.1 318 75 16 981 543 41.7 1.79 0.02292 0.1754 0.0557 164.0 5.2 146.1 1.9 428 72 17 1526 608 49.9 2.51 0.0242 0.1774 0.0531 165.7 4.1 154.1 2.6 333 70 19 1217 875 71.2 1.42 0.02446 0.1969 0.0580 182.5 4.6 155.8 1.7 545 64 20 1171 681 51.9 1.73 0.02396 0.1681 0.0506 157.6 4.7 152.7 1.8 229 69 21 993 505 38.6 1.94 0.02265 0.1675 0.0539 157.1 6.7 144.4 1.8 360 100 22 830 399 28.0 2.13 0.02244 0.1638 0.0531 153.9 4.7 143.0 1.7 321 77 23 1006 627 45.2 1.67 0.02257 0.1663 0.0532 156.1 5.6 143.9 1.3 323 84 24 498 179 14.0 3.05 0.02243 0.1720 0.0556 161.2 9.0 143.0 2.8 430 130 25 1258 756 54.1 1.68 0.02288 0.1602 0.0509 150.8 4.9 145.8 1.8 222 83 NNH-G01 1 1410 970 57.4 1.59 0.02220 0.1750 0.0571 163.1 8.9 141.5 2.8 470 110 2 1107 1778 117.6 0.63 0.02182 0.1690 0.0563 158.4 5.7 139.1 1.8 481 75 3 1072 874 61.6 1.21 0.02150 0.1583 0.0531 149.1 5.2 137.2 1.2 372 93 4 1480 850 56.0 1.88 0.02131 0.1578 0.0537 148.7 3.6 135.9 1.9 348 61 5 1760 1220 57.4 1.34 0.02225 0.2170 0.0734 198.0 23 141.9 2.7 920 240 6 2440 1118 79.9 2.20 0.02225 0.1573 0.0511 148.2 3.6 141.8 1.7 237 62 7 1850 1319 84.9 1.42 0.02234 0.1901 0.0614 178.0 7.6 142.4 1.2 690 100 8 740 535 37.8 1.38 0.02134 0.1517 0.0511 143.2 7.5 136.1 2.0 270 130 9 2480 1410 94.0 1.81 0.02171 0.1581 0.0530 149.0 3.5 138.4 1.4 322 54 10 1264 542 41.2 2.53 0.02216 0.1830 0.0604 170.4 8.8 141.3 1.7 570 130 
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表 2 南泥湖、石宝沟岩体锆石Hf-O同位素分析结果
Table 2. Ziron Hf-O isotopic of Nannihu rock and Shibaogou Rock
样品 T（Ma） 176Hf/177Hf 176Lu/177Hf 176Yb177/Hf ɛHf（t） TDM1（Ga） TDM2（Ga） fLu/Hf δ18O（‰） SBG-G02 1 151.8 0.28220 0.002050 0.0574 −17.11 1.53 2.28 −0.94 5.42 2 141.9 0.28222 0.001486 0.0399 −16.55 1.47 2.24 −0.96 5.50 3 145.6 0.28215 0.001429 0.0391 −18.94 1.57 2.39 −0.96 5.83 4 132.4 0.28221 0.002088 0.0539 −17.05 1.51 2.26 −0.94 6.11 5 137.4 0.28222 0.001386 0.0398 −16.74 1.47 2.25 −0.96 5.93 6 141.0 0.28218 0.001413 0.0425 −17.98 1.53 2.33 −0.96 5.72 7 198.0 0.28224 0.001120 0.0307 −14.51 1.43 2.15 −0.97 6.32 8 147.3 0.28219 0.001309 0.0380 −17.41 1.51 2.30 −0.96 6.16 9 145.8 0.28214 0.001481 0.0480 −19.26 1.59 2.41 −0.96 5.91 10 143.2 0.28217 0.001505 0.0446 −18.19 1.54 2.34 −0.95 5.55 11 150.2 0.28210 0.002075 0.0576 −20.72 1.67 2.50 −0.94 6.28 12 153.4 0.28214 0.001526 0.0485 −19.14 1.59 2.41 −0.95 6.17 13 153.1 0.28222 0.001282 0.0376 −16.19 1.46 2.22 −0.96 6.39 14 151.3 0.28222 0.001263 0.0361 −16.26 1.46 2.23 −0.96 5.88 15 146.6 0.28221 0.002480 0.0800 −16.80 1.52 2.26 −0.93 6.55 16 146.1 0.28218 0.001245 0.0378 −17.82 1.52 2.32 −0.96 6.32 17 154.1 0.28216 0.001559 0.0441 −18.32 1.56 2.36 −0.95 5.89 18 155.8 0.28190 0.001095 0.0410 −27.40 1.90 2.93 −0.97 6.61 19 152.7 0.28217 0.001582 0.0483 −18.03 1.55 2.34 −0.95 8.27 20 144.4 0.28220 0.001254 0.0356 −17.29 1.50 2.29 −0.96 6.07 21 143.0 0.28218 0.001539 0.0391 −17.84 1.53 2.32 −0.95 — 22 143.9 0.28221 0.001564 0.0407 −17.05 1.50 2.27 −0.95 — 23 143.0 0.28218 0.001583 0.0473 −17.92 1.53 2.32 −0.95 — 24 145.8 0.28225 0.001101 0.0256 −15.55 1.42 2.18 −0.97 — 25 141.5 0.28219 0.001448 0.0403 −17.69 1.52 2.31 −0.96 — NNH-G01 1 139.1 0.28228 0.001318 0.0335 −14.37 1.38 2.10 −0.96 6.28 2 137.2 0.28246 0.000928 0.0361 −8.04 1.11 1.70 −0.97 6.17 3 135.9 0.28236 0.000910 0.0316 −11.71 1.26 1.93 −0.97 6.39 4 141.9 0.28232 0.001792 0.0473 −13.22 1.35 2.03 −0.95 5.88 6 142.4 0.28221 0.002084 0.0559 −16.84 1.51 2.26 −0.94 6.32 7 136.1 0.28228 0.001701 0.0497 −14.46 1.39 2.10 −0.95 5.89 8 138.4 0.28226 0.001053 0.0345 −15.31 1.41 2.16 −0.97 6.61 9 141.3 0.28223 0.001900 0.0518 −16.43 1.48 2.23 −0.94 8.27 10 153.5 0.28229 0.001399 0.0363 −13.86 1.37 2.08 −0.96 6.07
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