THE GEOCHEMICAL CHARACTERISTICS AND TECTONIC SIGNIFICANCE OF LA-ICP-MS ZIRCON U-PB DATING OF YAMATUO INTRUSIVE ROCKS, QINHAI PROVINCE
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摘要: 亚马托侵入岩位于柴达木盆地东北缘,为塔塔楞河大岩基的东段部分。岩性为似斑状正长花岗岩+斑状二长花岗岩组合,岩石中斑晶含量6%~25%,颗粒达1~5 cm,构成环斑结构。该侵入岩地球化学特征显示,Eu具明显的亏损特征,反映岩石经历了强烈的分离结晶作用,与壳源花岗岩(S型)很相似,表明这些花岗岩为地壳部分熔融的产物,属后碰撞环境的壳源岩浆岩组合。LA-ICP-MS锆石U-Pb测年结果表明岩体形成于429.9±1.4 Ma,时代为早志留世,佐证了其是早古生代造山过程结束或近于结束的标志,这一成果为进一步研究柴北缘造山带的构造演化提供了重要的年代学约束。
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关键词:
- 柴北缘 /
- 亚马托侵入岩 /
- 地球化学 /
- LA-ICP-MS锆石U-Pb测年
Abstract: Yamatuo intrusive rocks, distributing in the northern margin of Qaidam basin, compose the east part of Tataleng River batholith. The lithology of these rocks is the combination of porphyritic-like syenogranite and porphyritic monzogranite. The phenocryst content in the rocks is 6~25% and its grain size is 1~5 cm, revealing rapakivi texture. The geochemical characteristics show that Eu is with obvious depleted characteristics reflecting the strong fractional crystallization of rocks which is very similar to crustal-derived granite (S). All the facts indicate the intrusive rocks are the partial melting of the crust, belonging to the mixture of crust-derived magmatite in post-collisional tectonic setting. The result analysis of LA-ICP-MS zircon U-Pb dating indicates that the rock mass was formed in early Silurian 429.9±1.4 Ma, being the signature of the end or near the end of the orogenic process in early Paleozoic This finding provides important chronological constraints for further study of the tectonic evolution of the northern margin of Qaidam orogenic belt. -
表 1 亚马托侵入岩岩石稀土元素及参数特征表(w×10-6)
Table 1. Rare-earth elements and parameter characteristics table of Yamatuo intrusive rocks
序号 岩性 样品编号 轻稀土元素 重稀土元素 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 1 黑云母正长花岗岩 PM12-XT1 20.0 47.9 5.49 19.8 5.28 0.23 5.98 1.11 7.56 1.52 4.74 0.70 4.61 0.63 2 PM12-XT2 19.9 45.8 5.28 19.0 5.07 0.31 5.65 1.06 6.83 1.33 4.17 0.60 4.18 0.55 3 PM12-XT3 15.8 38.6 4.44 15.6 4.10 0.17 4.67 0.88 5.68 1.10 3.45 0.53 3.57 0.50 4 PM12-XT4 17.5 36.0 4.36 15.3 4.21 0.26 4.56 0.90 5.64 1.10 3.39 0.53 3.84 0.52 5 PM12-XT5 25.0 56.8 6.96 24.7 6.36 0.33 7.01 1.24 7.97 1.55 4.78 0.68 4.59 0.61 6 PM12-XT6 27.2 59.4 7.14 25.4 6.12 0.47 6.83 1.22 7.97 1.57 4.86 0.69 4.52 0.60 7 PM12-XT7 27.8 60.5 6.82 24.5 5.58 0.51 6.06 0.94 5.42 1.05 3.11 0.43 2.83 0.38 8 PM12-XT8 30.1 63.0 7.54 27.3 6.21 0.68 6.63 1.03 5.94 1.16 3.53 0.48 2.99 0.39 9 PM12-XT9 18.1 44.1 5.34 19.5 5.67 0.15 6.26 1.22 8.08 1.52 4.86 0.71 4.70 0.65 10 PM12-XT10 30.0 62.9 7.25 25.8 5.75 0.71 6.18 0.98 5.86 1.13 3.30 0.45 2.90 0.38 11 PM12-XT11 34.4 70.4 7.97 28.6 6.10 0.86 6.95 1.02 5.85 1.09 3.31 0.45 2.81 0.36 12 黑云母二长花岗岩 PM12-XT12 38.7 80.4 9.16 32.9 7.14 0.74 7.97 1.18 6.97 1.33 3.90 0.53 3.33 0.44 13 PM12-XT13 39.4 85.1 9.54 33.6 7.20 0.73 7.87 1.15 6.63 1.24 3.81 0.51 3.30 0.44 14 PM12-XT14 39.3 80.3 9.38 33.4 7.34 0.89 8.03 1.22 7.26 1.39 4.14 0.54 3.26 0.47 15 PM12-XT15 39.3 77.3 9.25 33.4 7.20 0.97 8.28 1.27 7.40 1.43 4.18 0.54 3.23 0.44 16 PM12-XT16 64.3 133 14.4 52.3 9.56 1.35 10.4 1.31 6.82 1.23 3.57 0.48 3.00 0.42 17 PM12-XT17 58.0 120 13.3 48.1 8.70 1.30 9.81 1.24 6.52 1.27 3.54 0.47 3.01 0.43 18 PM12-XT18 64.2 134 15.1 52.6 9.60 1.14 10.7 1.32 6.75 1.21 3.51 0.45 2.83 0.38 序号 特征参数 Y ∑REE LREE HREE LREE/HREE (La/Yb) N Sm/Nd La/Sm δCe δEu 1 43.9 125.55 98.7 26.85 3.68 2.52 0.27 3.79 1.09 0.12 2 39.2 119.73 95.36 24.37 3.91 2.77 0.27 3.93 1.06 0.18 3 31.7 99.09 78.71 20.38 3.86 2.57 0.26 3.85 1.10 0.12 4 30.8 98.11 77.63 20.48 3.79 2.65 0.28 4.16 0.98 0.18 5 44.7 148.58 120.15 28.43 4.23 3.17 0.26 3.93 1.03 0.15 6 45.4 153.99 125.73 28.26 4.45 3.50 0.24 4.44 1.01 0.22 7 29.3 145.93 125.71 20.22 6.22 5.71 0.23 4.98 1.04 0.27 8 33.2 156.98 134.83 22.15 6.09 5.85 0.23 4.85 0.99 0.32 9 43.7 120.86 92.86 28 3.32 2.24 0.29 3.19 1.08 0.08 10 31.5 153.59 132.41 21.18 6.25 6.01 0.22 5.22 1.01 0.36 11 31.0 170.17 148.33 21.84 6.79 7.12 0.21 5.64 1.00 0.40 12 36.3 194.69 169.04 25.65 6.59 6.76 0.22 5.42 1.01 0.30 13 35.0 200.52 175.57 24.95 7.04 6.94 0.21 5.47 1.04 0.30 14 39.2 196.92 170.61 26.31 6.48 7.01 0.22 5.35 0.99 0.35 15 39.4 194.19 167.42 26.77 6.25 7.07 0.22 5.46 0.96 0.38 16 33.7 302.14 274.91 27.23 10.10 12.46 0.18 6.73 1.03 0.41 17 33.4 275.69 249.4 26.29 9.49 11.20 0.18 6.67 1.02 0.43 18 32.8 303.79 276.64 27.15 10.19 13.19 0.18 6.69 1.02 0.34 注:测试单位为国土资源部西安矿产资源监督检测中心 表 2 亚马托侵入岩岩石微量元素特征表
Table 2. Trace element characteristics table of Yamatuo intrusive rocks
序号 样号 微量元素丰度(ωB/10-6) Zr Nb Ba Hf Ta Ni P Sr Ti Sc Cr Co 1 PM12-Dy1 85.7 16.6 288 8.53 1.4 1.33 289 31.6 469 4.42 15.1 1.10 2 PM12-Dy2 99.2 32.8 500 7.71 0.74 2.11 290 52.2 572 4.76 16.3 1.27 3 PM12-Dy3 107 32.2 222 6.43 1.56 2.04 341 45.8 594 4.59 16.2 1.42 4 PM12-Dy4 67 34.4 98.2 7.18 1.91 1.13 318 50.2 352 5.69 23.9 0.81 5 PM12-Dy5 86.4 18.5 135 7.45 1.38 1.28 269 33.5 474 5.35 15.7 1.11 6 PM12-Dy6 101 16.5 226 5.1 1.07 1.92 274 61.1 679 3.58 13.9 1.37 7 PM12-Dy7 91.6 21.9 184 3.7 0.89 1.26 1025 45.7 606 3.58 14.3 1.29 8 PM12-Dy8 81.1 24.7 183 4.12 0.48 1.77 259 54.4 574 4.40 63.5 1.41 9 PM12-Dy9 79.4 27.3 60.9 7.21 1.05 0.96 315 23.6 438 4.01 11.5 0.83 10 PM12-Dy10 107 46 324 3.43 1.05 1.9 289 46.6 644 2.66 17.9 1.58 11 PM12-Dy11 108 53.6 398 3 1.2 1.99 288 64.1 627 2.80 10.7 1.30 12 PM12-Dy12 141 45.8 317 3.37 0.76 2.16 356 77.7 839 3.85 18.6 1.55 13 PM12-Dy13 144 46.6 303 3.73 0.99 2.1 320 63.6 808 3.86 27.2 2.08 14 PM12-Dy14 114 15.2 356 3.46 1.27 2.51 332 79.0 768 5.38 46.8 1.68 15 PM12-Dy15 127 47.1 312 4.95 0.88 2.3 291 49.9 821 5.05 23.1 1.78 16 PM12-Dy16 203 29.6 746 2.49 1.86 5.96 462 133 1473 7.49 31.6 4.10 17 PM12-Dy17 225 23.5 744 2.25 1.26 6.86 784 105 1631 7.87 64.4 4.84 18 PM12-Dy18 130 36.3 1046 2.25 0.86 4.39 393 105 1150 6.04 12.5 3.37 维氏值(1962) 200 20 830 1 3.5 8 700 300 2300 3 25 5 序号 样号 微量元素丰度(ωB/10-6) 参数 Rb Mo W V Th U Rb/Sr 1 PM12-Dy1 449 4.30 2.05 8.13 27.1 4.71 14.21 2 PM12-Dy2 421 2.39 5.37 14.1 28.7 6.99 8.07 3 PM12-Dy3 401 1.39 3.38 8.76 25.6 4.19 8.76 4 PM12-Dy4 556 3.99 3.80 6.19 24.8 3.06 11.08 5 PM12-Dy5 441 2.63 3.35 6.59 27.1 5.89 13.16 6 PM12-Dy6 314 0.68 3.83 10.1 25.8 2.57 5.14 7 PM12-Dy7 355 0.90 3.54 9.78 20.4 2.05 7.77 8 PM12-Dy8 392 0.50 2.21 10.1 16.3 2.44 7.21 9 PM12-Dy9 449 0.51 4.08 4.37 21.7 5.19 19.03 10 PM12-Dy10 303 1.37 1.83 11.2 22.2 2.93 6.50 11 PM12-Dy11 275 0.87 1.13 11.5 23.2 2.09 4.29 12 PM12-Dy12 268 1.14 1.70 13.6 30.2 3.98 3.45 13 PM12-Dy13 289 1.51 2.27 13.2 30.8 1.71 4.54 14 PM12-Dy14 296 0.51 9.29 16.6 31.6 2.23 3.75 15 PM12-Dy15 292 0.72 1.82 13.4 34.3 3.80 5.85 16 PM12-Dy16 230 1.33 1.43 28.8 35.7 2.64 1.73 17 PM12-Dy17 228 0.56 1.23 30.0 37.9 2.63 2.17 18 PM12-Dy18 220 1.44 1.82 23.3 27.6 1.39 2.10 维氏值(1962) 200 1 1.5 40 18 3.5 注:测试单位为国土资源部西安矿产资源监督检测中心 表 3 黑云母二长花岗岩体锆石U-Pb测试结果表
Table 3. Test results table of biotite monzogranite zircon U-Pb
样品编号 PM12-U-Pb2 岩石名称 黑云母二长花岗岩 点号 同位素比值 表面年龄及误差(Ma) 206Pb/ 238U 207Pb/ 235U 207Pb/ 206Pb 208Pb/ 232Th 238U/ 232Th 206Pb/ 238U 1σ 207Pb/ 235U 1σ 207Pb/ 206Pb 1σ 1 0.0682 0.5240 0.0559 0.0198 2.3968 425.09 3.83 427.81 10.81 450.05 72.22 2 0.0680 0.5424 0.0578 0.0198 2.2952 424.03 3.75 439.99 9.91 524.11 61.10 3 0.2888 5.9647 0.1476 0.0651 2.6858 1635.39 32.66 1970.71 26.29 2320.38 31.33 4 0.0696 0.5386 0.0562 0.0189 1.8104 433.63 3.77 437.53 10.27 461.16 64.81 5 0.0686 0.5399 0.0573 0.0200 2.4201 427.54 4.12 438.38 12.58 505.60 81.47 6 0.0682 0.5247 0.0557 0.0198 2.8448 425.20 4.20 428.30 10.03 442.64 62.96 7 0.0683 0.5481 0.0582 0.0195 2.2280 425.71 4.04 443.77 11.68 538.93 72.21 8 0.0682 0.5256 0.0559 0.0188 1.3397 425.06 3.64 428.92 9.29 450.05 61.11 9 0.0695 0.5361 0.0559 0.0203 1.6023 433.10 4.99 435.87 12.21 455.60 75.92 10 0.0686 0.5171 0.0547 0.0197 2.0621 427.65 4.88 423.22 13.06 398.20 78.70 11 0.0686 0.5277 0.0556 0.0208 5.2381 427.88 3.46 430.31 8.00 435.23 50.00 12 0.0686 0.5151 0.0543 0.0209 2.1943 427.54 4.05 421.85 10.25 388.94 66.66 13 0.0693 0.5322 0.0556 0.0203 2.5727 431.73 3.84 433.24 9.64 435.23 61.11 14 0.0684 0.5298 0.0561 0.0206 2.4221 426.53 4.09 431.65 11.52 453.75 69.44 15 0.0686 0.5252 0.0555 0.0208 2.1768 427.83 4.16 428.61 10.26 435.23 66.66 16 0.0694 0.5630 0.0585 0.0217 2.2445 432.76 4.79 453.50 13.26 546.33 74.06 17 0.0684 0.5459 0.0578 0.0208 3.1352 426.73 5.12 442.33 12.46 520.41 75.92 18 0.0690 0.5401 0.0566 0.0204 2.3236 429.98 4.80 438.52 11.31 475.97 66.66 19 0.0689 0.5441 0.0575 0.0213 2.2112 429.28 4.10 441.16 10.99 509.30 74.99 20 0.0690 0.5370 0.0563 0.0212 2.8453 429.89 3.66 436.45 8.51 461.16 56.48 21 0.0734 0.9300 0.0911 0.0450 4.3044 456.65 5.70 667.64 13.43 1450.01 42.44 22 0.0695 0.5310 0.0554 0.0213 1.5380 433.06 5.30 432.46 13.36 427.83 83.33 23 0.0689 0.5240 0.0550 0.0212 1.5057 429.52 4.33 427.85 10.69 409.31 66.66 24 0.0693 0.5243 0.0545 0.0207 4.0551 432.08 3.92 428.00 9.96 394.50 64.81 25 0.0691 0.5175 0.0540 0.0217 2.3313 431.00 4.31 423.49 11.32 372.28 74.07 26 0.0696 0.5165 0.0535 0.0214 2.4004 433.91 4.34 422.81 10.81 350.06 70.37 27 0.0697 0.5492 0.0569 0.0202 2.3456 434.24 4.92 444.45 11.37 487.08 68.51 28 0.0697 0.5324 0.0553 0.0218 2.2845 434.06 4.27 433.37 11.17 433.38 72.22 29 0.0690 0.5317 0.0556 0.0204 2.5604 430.31 5.25 432.95 12.80 435.23 84.25 30 0.0695 0.5345 0.0554 0.0206 2.9254 433.13 4.05 434.77 10.30 427.83 69.44 31 0.0695 0.5418 0.0565 0.0209 2.1656 433.00 4.28 439.62 10.75 472.27 36.11 32 0.0693 0.5011 0.0524 0.0209 1.9385 432.03 5.12 412.44 11.56 301.91 77.77 33 0.0695 0.5102 0.0530 0.0207 2.3624 433.40 4.61 418.59 10.29 331.54 66.66 34 0.0695 0.5350 0.0560 0.0203 2.3000 433.28 4.33 435.12 10.80 450.05 65.74 35 0.0692 0.5320 0.0556 0.0208 3.2766 431.04 4.71 433.15 11.88 438.94 80.55 36 0.0694 0.5122 0.0535 0.0202 2.4103 432.43 4.04 419.96 10.91 350.06 78.70 备注:1.表中所列误差均为1σ误差;2.样品测试单位为西北大学 -
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