Petrogeochemistry, Zircon U-Pb Dating and Geological Significance of Two-Mica Granites from Wuduoshan Granite in Nanzhao County, Eastern Qinling Mountains
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摘要: 秦岭造山带地处华北板块与扬子板块结合带,经历了复杂的构造演化过程,其板块拼合机制及碰撞时限一直备受争议.对东秦岭南召县五朵山岩体二云母花岗岩进行岩石地球化学和LA-ICP-MS锆石U-Pb年代学研究,结果表明岩石具有高硅(SiO2=69.32%~74.28%)、高铝(Al2O3=14.14~17.28)、高碱含量(Na2O+K2O=7.68%~9.03%)等特征,且相对富钾贫钠,在岩石类型上属于强过铝质"S"型花岗岩类.岩石具有中等的稀土元素含量,呈现轻稀土富集、重稀土亏损的右倾配分模式,中等的负Eu异常,富集K、Rb、Th等大离子亲石元素,亏损Ba、Nb、Sr、P、Ti等元素,表明南召县二云母花岗岩可能形成于陆陆碰撞所导致的陆壳加厚环境.LA-ICP-MS锆石U-Pb分析结果表明,二云母花岗岩锆石均具有明显的韵律环带,Th/U比值均大于0.4,暗示岩浆成因特征,206Pb/238U加权平均年龄为433±2 Ma;结合构造环境特征,表明东秦岭南召地区在早志留世末期由俯冲环境转换为陆陆碰撞环境.Abstract: The Qinling orogenic belt, located in the suture zone of the North China Plate and the Yangtze Plate, has undergone a complicated tectonic evolution process however, its plate combination mechanism and collision time limit have been controversial. In this study, petrogeochemistry analyses and LA-ICP-MS zircon U-Pb dating are undertaken for the two-mica granites from Wuduoshan in Nanzhao County, eastern Qinling mountains. Results show that the two-mica granites have SiO2=69.32%-74.28%, Al2O3=14.14%-17.28%, Na2O+K2O=7.68%-9.03%, and belong chemically to peraluminous series of S type. Meanwhile, the two-mica granites have a moderate amount of rare earth elements, with medium fractionation characteristics between light rare earth elements and heavy rare earth elements and medium negative Eu anomalies. The trace elements diagram shows enrichment of large ion lithophile elements (LILEs) and depletion of Ba, Nb, Sr, P and Ti, indicating that the two-mica granites may have been formed in the thickened crust caused by the collision between continents. Zircons from the two-mica granites in this study display fine-scale oscillatory growth and high ratios of Th/U (> 0.4), indicating a magmatic origin. The dating of the two-mica granites yields a LA-ICP-MS zircon U-Pb age of 433±2 Ma. Combined with constructional environment, it is concluded that it was transformed from plate subduction to continental collision in the Nanzhao County at late of Early Silurian.
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图 3 研究区二云母花岗岩SiO2-K2O图解(a)和A/CNK-A/NK图解(b)
图a据Peccerillo and Taylor(1976);图b据Maniar and Piccoli(1989)
Fig. 3. Plot of SiO2 vs. K2O (a) and A/CNK vs. A/NK in the study area (b)
图 4 研究区二云母花岗岩稀土元素球粒陨石标准化配分图(a)和微量元素原始地幔蛛网图(b)
Fig. 4. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace elements spider (b)
图 7 南召县二云母花岗岩A(Al-Na-K)-C(Ca)-F(Mg+Fe2+)图解
Fig. 7. Plot of A(Al-Na-K)-C(Ca)-F(Mg+Fe2+) of the two-mica granite from the Nanzhao County
图 9 研究区二云母花岗岩R1-R2构造判别图解
Fig. 9. R1-R2 tectonic discrimination diagram for two-mica granites
表 1 南召县二云母花岗岩主量元素(%)、微量元素及稀土元素(10-6)分析结果
Table 1. Major (%), trace elements and rare earth elements (10-6) compositions for two-mica granites in Nanzhao County
样品号 005/7 006/3 1038/3 2021/1 209/4 210/1 6010/1 SiO2 70.13 70.55 74.28 72.07 70.17 72.37 69.32 TiO2 0.14 0.18 0.06 0.14 0.22 0.25 0.29 Al2O3 17.28 16.18 14.64 15.58 14.14 14.34 15.41 Fe2O3 0.45 0.59 0.23 0.77 3.14 1.17 1.72 FeO 0.57 0.80 0.38 0.35 1.83 1.15 1.52 MnO 0.13 0.05 0.04 0.05 0.08 0.09 0.13 MgO 0.23 0.36 0.13 0.26 0.18 0.46 0.82 CaO 0.48 1.46 1.08 1.07 1.07 1.44 1.29 Na2O 4.69 4.58 4.24 3.83 2.94 3.23 3.38 K2O 4.34 3.80 4.03 4.49 5.22 4.45 4.30 P2O5 0.05 0.06 0.04 0.07 0.10 0.11 0.15 LOI 1.24 1.07 0.64 1.06 0.50 0.55 1.28 H2O+ 1.24 1.20 0.64 1.01 0.63 0.36 1.27 Total 99.75 99.68 99.79 99.74 99.58 99.59 99.61 A/CNK 1.30 1.13 1.10 1.19 1.14 1.12 1.22 Rb 217.8 153.2 165.6 168.6 156.8 184.9 143.5 Ba 538.7 808.0 430.5 714.4 813.6 1386 809.1 Th 8.16 10.26 13.39 9.95 47.49 21.15 8.55 U 1.20 1.45 1.09 1.27 2.10 1.05 1.11 Ta 1.71 1.62 1.37 1.21 0.61 0.96 1.12 Nb 11.88 10.75 9.19 9.32 5.31 8.50 9.32 Sr 243.1 420.5 224.4 363.5 186.9 316.1 305.0 Hf 3.4 3.7 2.5 3.1 5.6 4.8 3.12 Zr 72.6 95.2 42.3 72.4 210.3 177.0 110.7 La 11.93 17.67 8.52 13.65 67.52 32.72 28.27 Ce 22.99 31.91 16.22 26.79 132.3 56.55 52.76 Pr 2.74 3.71 1.80 3.00 13.00 6.68 6.83 Nd 9.72 13.25 6.57 10.71 42.94 22.58 24.87 Sm 2.25 2.43 1.42 2.21 7.85 3.96 4.83 Eu 0.44 0.60 0.36 0.58 0.86 0.87 1.07 Gd 1.91 1.88 1.40 1.81 6.80 3.37 3.51 Tb 0.34 0.27 0.27 0.31 0.96 0.52 0.56 Dy 1.86 1.28 1.74 1.53 4.52 2.74 2.85 Ho 0.33 0.21 0.34 0.26 0.83 0.57 0.52 Er 0.84 0.53 0.99 0.70 2.13 1.54 1.36 Tm 0.12 0.08 0.15 0.10 0.27 0.22 0.21 Yb 0.78 0.48 0.87 0.60 1.75 1.38 1.24 Lu 0.11 0.07 0.13 0.09 0.25 0.20 0.18 Y 9.71 6.28 10.91 7.71 21.90 15.64 15.22 δEu 0.62 0.83 0.78 0.86 0.35 0.71 0.76 总和 66.08 80.65 51.70 70.05 303.84 149.53 144.28 表 2 南召县下桐扒二云母花岗岩LA-ICP-MS锆石U-Pb年龄测试数据
Table 2. LA-ICP-MS zircon dating results for two-mica granite in Nanzhao County
点号 U(10-6) Th(10-6) Th/U 同位素比值 年龄(Ma) 谐和度
(%)207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 1 249 1 240 0.99 0.056 5 0.000 9 0.543 2 0.010 2 0.069 8 0.000 7 471 36 441 8 435 4 99 2 184 195 1.06 0.056 3 0.001 1 0.541 1 0.011 6 0.069 7 0.000 7 463 45 439 9 435 4 99 3 658 406 0.62 0.057 0 0.000 9 0.552 0 0.009 2 0.070 2 0.000 8 493 33 446 7 438 5 98 4 485 219 0.45 0.055 7 0.000 9 0.528 8 0.009 2 0.068 9 0.000 7 439 36 431 7 430 4 100 5 517 535 1.04 0.056 3 0.000 9 0.529 2 0.008 9 0.068 2 0.000 7 464 35 431 7 425 4 99 6 1 299 633 0.49 0.056 7 0.000 8 0.540 5 0.008 5 0.069 1 0.000 7 481 32 439 7 431 4 98 7 325 176 0.54 0.055 9 0.001 0 0.542 0 0.010 4 0.070 2 0.000 7 450 40 440 8 438 4 100 8 371 194 0.52 0.056 3 0.001 0 0.543 9 0.010 0 0.070 1 0.000 7 463 38 441 8 437 4 99 9 534 328 0.61 0.056 5 0.000 9 0.547 3 0.009 9 0.070 2 0.000 7 470 36 443 8 437 4 99 10 588 90 0.15 0.056 9 0.000 9 0.543 5 0.009 1 0.069 3 0.000 7 488 34 441 7 432 4 98 11 1 448 607 0.42 0.055 8 0.000 8 0.539 6 0.008 5 0.070 1 0.000 7 446 32 438 7 437 4 100 12 1 421 591 0.42 0.056 6 0.000 8 0.545 6 0.008 5 0.069 9 0.000 7 476 32 442 7 436 4 99 13 304 194 0.64 0.056 4 0.001 3 0.540 4 0.013 7 0.069 1 0.000 7 469 50 439 11 431 5 98 14 337 135 0.40 0.056 6 0.001 0 0.539 8 0.010 3 0.069 2 0.000 7 474 40 438 8 431 4 98 15 996 418 0.42 0.056 8 0.000 8 0.545 6 0.008 6 0.069 6 0.000 7 482 32 442 7 434 4 98 16 802 337 0.42 0.056 5 0.000 8 0.539 0 0.008 7 0.069 0 0.000 7 471 33 438 7 430 4 98 17 1 062 475 0.45 0.055 7 0.000 8 0.532 8 0.008 6 0.069 1 0.000 7 439 33 434 7 431 4 99 -
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