Zircon U–Pb Age of Volcanic Rocks from the Langmusi Formation in the Western Qinling Mountains and Its Tectonic Significance
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摘要:
西秦岭郎木寺地区发育了大量的火山岩，是探讨秦岭造山带印支期岩浆作用的重要窗口。目前，关于郎木寺组火山岩的形成时代尚未有很好的约束。据此，笔者对郎木寺组角闪安山岩开展了详细的LA−ICP−MS锆石U−Pb年代学研究。CL图像显示，郎木寺组角闪安山岩的锆石结构表现出典型的岩浆成因特征。锆石U−Pb定年结果显示，角闪安山岩具略有差异的两组年龄，加权平均年龄分别为（221.8±1.2）Ma和（210.6±2.1）Ma。因此，郎木寺组角闪安山岩的形成时代为晚三叠世。结合前人已有成果，笔者认为郎木寺组火山岩代表了秦岭印支期造山作用重要的岩浆事件产物，形成于同碰撞挤压的构造环境。
Abstract:Volcanic rocks are wide spread in Langmusi area of western Qinling, which is an important window to study the Indosinian magmatism of the Qinling Orogen. However, the formation age of langmusi volcanic rocks is not well constrained. In this contribution, a detailed study of LA−ICP−MS zircon U−Pb geochronology for the hornblende andesites from Langmusi Formation was conducted. CL images show that the internal structures of zircon from hornblende andesites show typical magmatic origin. Zircon U−Pb dating results demonstrate that the horndiorite andesites have slightly different ages, with weighted average ages of (221.8±1.2) Ma and (210.6±2.1) Ma respectively. Therefore, the horndiorite andesites of langmusi Formation were formed the Late Triassic period. Combining with previous studies, we argue that the volcanic rocks of the Langmusi Formation represent an important magmatic event of the Qinling Indosinian orogeny, which were formed in a syn−collisional tectonic setting.
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Key words:
- Langmusi formation /
- hornblende andesite /
- zircon U−Pb dating /
- tectonic setting /
- Qinling orogen
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图 3 郎木寺组角闪安山岩稀土元素球粒陨石配分曲线（Boynton et al.，1984）
Figure 3.
表 1 郎木寺组角闪安山岩锆石U–Pb同位素分析结果统计表
Table 1. Zircon U–Pb isotope analysis of jiaoshan andesite in Langmusi formation
分析点 含量（10−6） 同位素比值 年龄（Ma） Pb* Th U Th/U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/235U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/235U 1σ KD-1-1 14 210 344 0.61 0.0505 0.0024 0.2321 0.0100 0.0334 0.0004 216 106 212 8 212 3 KD-1-2 20 348 466 0.75 0.0537 0.0025 0.2441 0.0104 0.0330 0.0004 358 103 222 9 209 3 KD-1-3 14 234 340 0.69 0.0534 0.0024 0.2578 0.0101 0.0350 0.0004 344 97 233 8 222 3 KD-1-4 11 169 256 0.66 0.0495 0.0023 0.2399 0.0100 0.0351 0.0005 174 104 218 8 223 3 KD-1-5 13 182 279 0.65 0.0738 0.0028 0.3513 0.0113 0.0345 0.0004 1036 74 306 8 219 3 KD-1-6 22 282 495 0.57 0.0703 0.0023 0.3350 0.0089 0.0345 0.0004 938 66 293 7 219 2 KD-1-7 15 207 382 0.54 0.0505 0.0023 0.2311 0.0093 0.0332 0.0004 218 101 211 8 211 3 KD-1-8 14 199 327 0.61 0.0646 0.0023 0.3078 0.0093 0.0346 0.0004 762 74 273 7 219 2 KD-1-9 18 314 407 0.77 0.0506 0.0021 0.2456 0.0087 0.0352 0.0004 222 91 223 7 223 3 KD-1-10 14 210 317 0.66 0.0508 0.0022 0.2455 0.0092 0.0350 0.0004 232 95 223 8 222 3 KD-1-11 16 196 365 0.54 0.0506 0.0020 0.2453 0.0082 0.0352 0.0004 220 87 223 7 223 3 KD-1-12 17 234 412 0.57 0.0551 0.0025 0.2615 0.0105 0.0344 0.0005 417 97 236 8 218 3 KD-1-13 13 158 307 0.51 0.0533 0.0021 0.2551 0.0088 0.0347 0.0004 339 87 231 7 220 3 KD-1-14 14 221 332 0.66 0.0503 0.0022 0.2318 0.0091 0.0334 0.0004 210 99 212 8 212 3 KD-1-15 16 262 356 0.74 0.0524 0.0020 0.2537 0.0084 0.0351 0.0004 304 85 230 7 222 3 KD-1-16 17 244 401 0.61 0.0503 0.0022 0.2317 0.0091 0.0334 0.0004 210 99 212 7 212 3 KD-1-17 14 216 393 0.55 0.0530 0.0023 0.2541 0.0100 0.0347 0.0004 330 96 230 8 220 3 KD-1-18 11 157 253 0.62 0.0506 0.0026 0.2458 0.0118 0.0352 0.0005 223 116 223 10 223 3 KD-1-19 21 326 506 0.64 0.0505 0.0021 0.2457 0.0090 0.0353 0.0004 220 93 223 7 223 3 KD-1-20 13 174 305 0.57 0.0506 0.0026 0.2452 0.0113 0.0352 0.0005 221 113 223 9 223 3 KD-1-21 17 330 403 0.82 0.0484 0.0022 0.2201 0.0091 0.0330 0.0004 119 105 202 8 209 3 KD-1-22 16 230 377 0.61 0.0514 0.0022 0.2465 0.0093 0.0348 0.0004 259 95 224 8 220 3 KD-1-23 8 105 191 0.55 0.0583 0.0056 0.2642 0.0244 0.0329 0.0008 541 198 238 20 208 5 KD-1-24 23 307 524 0.59 0.0507 0.0017 0.2453 0.0070 0.0351 0.0004 225 78 223 6 223 2 KD-1-25 16 199 382 0.52 0.0546 0.0027 0.2615 0.0118 0.0347 0.0005 395 107 236 10 220 3 KD-1-26 16 279 374 0.75 0.0502 0.0022 0.2408 0.0096 0.0348 0.0004 206 100 219 8 220 3 KD-1-27 15 161 331 0.49 0.0538 0.0020 0.2593 0.0081 0.0350 0.0004 361 81 234 7 222 2 KD-1-28 19 264 480 0.55 0.0810 0.0034 0.3688 0.0137 0.0330 0.0005 1222 81 319 10 209 3 KD-1-29 17 206 380 0.54 0.0620 0.0025 0.2985 0.0104 0.0349 0.0004 674 84 265 8 221 3 KD-1-30 20 211 395 0.53 0.0554 0.0024 0.2708 0.0102 0.0355 0.0004 427 92 243 8 225 3 
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表 2 郎木寺组角闪安山岩锆石稀土元素分析结果统计表（10−6）
Table 2. Zircon analysis of rare earth elements in jiaoshan andesite of Langmusi formation（10−6）
分析点 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu δEu (La/Yb)N (La/Sm)N (Gd/Yb)N (Gy/Yb)N Sm/Yb Eu/Yb Tb/Yb KD-1-1 127.26 112.30 72.21 62.74 46.54 8.31 65.45 90.64 130.43 195.58 278.01 375.29 548.00 686.61 0.15 0.23 2.73 0.12 0.24 0.08 0.02 0.17 KD-1-2 1505.82 1226.62 893.26 737.94 425.75 46.72 301.80 280.21 316.73 406.71 520.66 651.76 894.88 1068.50 0.13 1.68 3.54 0.34 0.35 0.48 0.05 0.31 KD-1-3 0.86 15.92 2.35 5.05 23.14 6.72 64.14 104.28 152.83 231.63 332.21 444.31 629.65 764.57 0.17 0.00 0.04 0.10 0.24 0.04 0.01 0.17 KD-1-4 0.09 12.99 1.31 3.58 16.21 5.62 50.27 82.09 122.95 187.10 266.71 355.69 523.00 636.61 0.20 0.00 0.01 0.10 0.24 0.03 0.01 0.16 KD-1-5 28.73 32.73 13.94 11.97 22.61 9.21 47.40 75.67 114.06 169.96 243.50 329.41 484.65 596.85 0.28 0.06 1.27 0.10 0.24 0.05 0.02 0.16 KD-1-6 331.14 283.81 196.53 159.91 98.82 11.03 90.07 106.15 146.93 213.78 306.77 407.84 574.71 730.71 0.12 0.58 3.35 0.16 0.26 0.17 0.02 0.18 KD-1-7 37.89 46.42 23.80 20.62 22.94 6.33 45.94 76.20 119.96 190.28 277.82 376.47 575.18 703.94 0.19 0.07 1.65 0.08 0.21 0.04 0.01 0.13 KD-1-8 1.96 13.84 1.95 3.47 16.93 5.07 39.95 71.20 110.91 171.73 248.04 340.00 493.65 604.72 0.19 0.00 0.12 0.08 0.22 0.03 0.01 0.14 KD-1-9 0.12 17.86 2.12 8.24 41.63 10.59 109.98 164.44 236.06 355.65 497.04 636.08 880.06 1080.31 0.16 0.00 0.00 0.12 0.27 0.05 0.01 0.19 KD-1-10 0.11 14.72 0.96 3.49 17.71 4.84 48.37 76.47 116.30 181.10 263.14 350.20 511.41 613.39 0.17 0.00 0.01 0.09 0.23 0.03 0.01 0.15 KD-1-11 0.44 15.83 0.92 1.86 11.11 4.21 37.23 63.90 104.17 168.55 240.85 341.96 497.18 613.39 0.21 0.00 0.04 0.07 0.21 0.02 0.01 0.13 KD-1-12 6.01 22.19 4.03 5.74 15.56 4.55 44.23 75.40 117.68 178.62 263.32 358.43 522.41 627.17 0.17 0.01 0.39 0.08 0.23 0.03 0.01 0.14 KD-1-13 0.44 12.94 0.83 1.58 7.78 3.09 32.17 52.46 87.87 138.34 204.71 282.75 423.65 509.84 0.20 0.00 0.06 0.08 0.21 0.02 0.01 0.12 KD-1-14 0.23 16.16 1.47 3.75 18.56 6.55 54.55 83.69 125.83 193.99 269.91 367.06 544.24 631.50 0.21 0.00 0.01 0.10 0.23 0.03 0.01 0.15 KD-1-15 0.24 16.49 2.85 7.84 34.18 10.14 84.82 134.22 197.17 293.29 404.29 550.98 752.82 897.24 0.19 0.00 0.01 0.11 0.26 0.05 0.01 0.18 KD-1-16 0.15 17.86 1.00 2.66 16.67 4.69 44.96 78.07 119.17 180.74 271.72 366.67 524.35 644.09 0.17 0.00 0.01 0.09 0.23 0.03 0.01 0.15 KD-1-17 0.11 14.17 0.43 2.66 19.02 5.91 46.57 79.68 117.64 187.81 265.68 369.02 561.41 661.81 0.20 0.00 0.01 0.08 0.21 0.03 0.01 0.14 KD-1-18 0.11 14.04 1.15 3.23 13.59 4.43 41.31 67.59 103.90 154.77 233.41 309.80 454.47 552.76 0.19 0.00 0.01 0.09 0.23 0.03 0.01 0.15 KD-1-19 1.00 21.72 2.01 4.97 22.48 5.81 60.19 101.07 153.50 225.80 322.24 442.75 639.41 752.76 0.16 0.00 0.04 0.09 0.24 0.04 0.01 0.16 KD-1-20 0.13 15.96 0.59 1.78 10.07 3.97 35.67 60.94 92.20 148.94 213.78 295.29 437.59 529.53 0.21 0.00 0.01 0.08 0.21 0.02 0.01 0.14 KD-1-21 0.59 18.68 7.03 16.15 53.73 17.66 133.92 200.27 292.01 408.83 556.31 716.86 995.29 1157.87 0.21 0.00 0.01 0.13 0.29 0.05 0.02 0.20 KD-1-22 0.12 18.01 0.89 2.87 14.71 4.38 47.93 75.13 117.99 180.57 260.66 354.51 525.53 629.53 0.16 0.00 0.01 0.09 0.22 0.03 0.01 0.14 KD-1-23 18.35 22.47 10.07 7.37 6.73 4.29 24.33 42.22 62.36 100.35 151.96 209.02 306.06 377.95 0.34 0.06 2.73 0.08 0.20 0.02 0.01 0.14 KD-1-24 0.17 20.78 1.37 3.73 20.07 5.05 54.50 90.11 135.28 214.66 306.16 422.35 622.06 720.08 0.15 0.00 0.01 0.09 0.22 0.03 0.01 0.14 KD-1-25 365.86 290.28 202.84 173.79 96.01 13.28 81.75 90.91 121.42 168.37 245.98 343.14 485.18 582.68 0.75 0.75 3.81 0.17 0.25 0.20 0.03 0.19 KD-1-26 0.20 17.71 3.94 10.81 39.35 13.24 104.96 155.88 228.62 329.51 455.47 601.96 840.65 965.35 0.00 0.00 0.01 0.12 0.27 0.05 0.02 0.19 KD-1-27 20.89 30.25 13.65 10.79 14.05 4.12 36.01 57.59 83.11 135.69 206.59 290.20 425.71 516.54 0.05 0.05 1.49 0.08 0.20 0.03 0.01 0.14 KD-1-28 0.39 20.05 0.81 2.55 17.78 4.71 48.13 84.22 132.05 204.95 304.71 437.25 614.47 681.50 0.00 0.00 0.02 0.08 0.21 0.03 0.01 0.14 KD-1-29 156.54 135.82 87.89 73.23 45.03 6.48 53.63 76.47 110.28 168.02 241.21 338.43 501.06 583.86 0.31 0.31 3.48 0.11 0.22 0.09 0.01 0.15 KD-1-30 4.21 18.66 2.38 3.62 11.24 3.60 36.74 62.09 100.20 160.78 237.40 330.59 489.88 601.97 0.01 0.01 0.37 0.07 0.20 0.02 0.01 0.13
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