GEOCHEMISTRY AND GEOCHRONOLOGY OF GRANODIORITES IN QUPANGLANGXIE AREA, NORTHERN BAYANKALA TERRANE
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摘要:
通过对曲旁浪斜花岗闪长岩进行岩相学、岩石地球化学及年代学研究，探讨其成因及构造环境.研究获得曲旁浪斜花岗闪长岩锆石SHRIMP U-Pb年龄213.8±2.0 Ma，表明岩浆侵位时代为中生代晚三叠世.花岗闪长岩具有高Si、Al2O3、Na，低K，贫Ca、Mg、Fe的特点，属SiO2过饱和铝过饱和I型花岗岩；具有明显富集K、Rb、Th，亏损Sm、Hf、Zr、Y、Yb的特征，并且具有负Eu异常.曲旁浪斜花岗闪长岩是陆内碰撞造山阶段深部滑脱构造导致地壳局部熔融的产物.
Abstract:Through the study on the petrography, lithogeochemistry and geochronology of granodiorites in Qupanglangxie area, the paper discusses the genesis and tectonic environment of the intrusive rocks. The SHRIMP zircon U-Pb dating yields a weighted mean age of 213.8±2.0 Ma, indicating that the emplacement occurred in Mesozoic Late Triassic. The granodiorites are characterized by high Si, Al2O3 and Na, low K, poor in Ca, Mg and Fe, belonging to SiO2 supersaturated and aluminum supersaturated I-type granite, with obvious enrichment of K, Rb and Th, deficiency of Sm, Hf, Zr, Y and Yb, and negative Eu anomaly. The granodiorites in the area were formed by the partial melting of crust caused by deep detachment structure in the stage of intracontinental collision orogeny.
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Key words:
- granodiorite /
- geochemical characteristic /
- geochronology /
- petrogenesis /
- Qupanglangxie area /
- Qinghai Province
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表 1 曲旁浪斜地区花岗闪长岩氧化物含量表
Table 1. Oxide content in granodiorites from Qupanglangxie area
样品编号 D8329-YH1* PM014-YS07-1 PM014-YS12-1 PM014-YS08-1 PM014-YS13-1 SiO2 65.37 63.236 60.017 55.03 56.67 TiO2 0.63 0.651 0.806 1.22 0.76 Al2O3 15.92 15.799 15.992 16.22 17.43 Fe2O3 1.07 5.483 6.129 7.18 4.9 FeO 2.48 MnO 0.066 0.073 0.095 0.11 0.07 MgO 1.5 1.4 1.942 3.87 2.08 CaO 2.57 2.421 3.88 5.54 4.26 Na2O 4.38 3.909 3.692 3.49 3.99 K2O 3.59 2.739 2.911 2.28 2.5 P2O5 0.17 0.263 0.295 0.29 0.2 H2O+ 1.78 含量单位：%. 
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表 2 曲旁浪斜地区花岗闪长岩稀土元素含量表
Table 2. REE contents in granodiorites from Qupanglangxie area
样品编号 D8329-YH1 PM014-YS07-1 PM014-YS12-1 PM014-YS08-1 PM014-YS13-1 La 33.5 27.22 28.35 25.9 21.7 Ce 56.2 57.66 59.84 54.1 43.2 Pr 6.84 7.05 7.41 6.74 5.16 Nd 23.7 25.53 27.15 25.3 18.7 Sm 4.77 5.47 5.8 5.63 4.01 Eu 1.27 1.37 1.51 1.43 1.33 Gd 4.11 4.33 4.66 4.74 3.3 Tb 0.63 0.74 0.8 0.83 0.58 Dy 3.42 3.95 4.28 4.58 3.16 Ho 0.68 0.71 0.78 0.85 0.58 Er 1.85 2.23 2.49 2.7 1.82 Tm 0.27 0.33 0.37 0.4 0.27 Yb 1.76 2.12 2.4 2.57 1.76 Lu 0.26 0.34 0.39 0.42 0.28 Y 17.2 22.23 24.49 26.1 18 ∑REE 139.26 139.05 146.23 136.19 105.85 LREE 126.28 124.3 130.06 119.1 94.1 HREE 12.98 14.75 16.17 17.09 11.75 LREE/HREE 9.73 8.43 8.04 6.97 8.01 La/Yb 19.03 12.84 11.81 10.08 12.33 Sm/Nd 0.2 0.21 0.21 0.22 0.21 Gd/Yb 2.34 2.04 1.94 1.84 1.87 （La/Yb）N 13.65 9.21 8.47 7.23 8.84 （La/Sm）N 4.79 6.95 3.46 4.6 5.41 δEu 0.86 0.83 0.86 0.82 1.09 δCe 0.86 1 0.99 0.98 0.97 含量单位：10-6.
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表 3 曲旁浪斜地区花岗闪长岩微量元素含量表
Table 3. Content of trace elements in granodiorites from Qupanglangxie area
样品编号 D8329-YH1 PM014-YS07-1 PM014-YS12-1 PM014-YS08-1 PM014-YS13-1 Rb 158 99.02 100.17 86.7 108 Ba 593 485.98 476.66 410 439 Th 11.3 10.38 9.12 10 8.72 U 4.51 3.67 2.33 3.69 2.91 Nb 22.6 25.55 30.72 24 13.6 Ta 2.26 1.36 1.42 1.45 1.69 Sr 274 321.78 337.62 343 425 Zr 160 229.2 241.43 223 162 Hf 4.48 6.42 6.57 6.14 4.62 Lu 0.26 0.34 0.39 0.42 0.28 Cr 37.29 95.55 43.33 95.6 26.3 La 33.5 27.22 28.35 25.9 21.7 Ce 56.2 57.66 59.84 54.1 43.2 Nd 23.7 25.53 27.15 25.3 18.7 Sm 4.77 5.47 5.8 5.63 4.01 Eu 1.27 1.37 1.51 1.43 1.33 Tb 0.63 0.74 0.8 0.83 0.58 Y 17.2 22.23 24.49 26.1 18 Er 1.85 2.23 2.49 2.7 1.82 Yb 1.76 2.12 2.4 2.57 1.76 含量单位：10-6.
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表 4 曲旁浪斜地区花岗闪长岩U-Pb同位素年龄测定结果表
Table 4. U-Pb isotopic dating results of granodiorites in Qupanglangxie area
编号 同位素比值 年龄/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 0.12141 0.0032 0.60592 0.0012 0.03633 0.0018 1977.1 49 481 9 230.1 5 2 0.05076 0.0017 0.24768 0.0014 0.03558 0.0017 229.9 75 224.7 11 225.4 5 3 0.05099 0.0021 0.2354 0.0011 0.03366 0.0019 240.2 95 214.7 10 213.4 3 4 0.22372 0.0019 0.9754 0.0017 0.03179 0.0011 3007.6 65 691.2 8 201.7 3 5 0.06375 0.0011 0.30454 0.0023 0.03483 0.0022 733.4 25 269.9 13 220.7 21 6 0.04922 0.0023 0.22217 0.0007 0.03291 0.0027 158.4 22 203.7 11 208.7 18 7 0.05355 0.0027 0.25226 0.0013 0.03434 0.0025 352 48 228.4 8 217.7 3 8 0.04618 0.0018 0.21509 0.0012 0.03395 0.0012 7.2 49 197.8 22 215.2 10 9 0.04924 0.0024 0.22636 0.0015 0.03351 0.0015 159.4 26 207.2 14 212.5 23 10 0.05389 0.0015 0.24526 0.0017 0.03317 0.0017 366.4 16 222.7 15 210.4 5 11 0.04993 0.0016 0.23407 0.0011 0.03417 0.0021 191.8 60 213.6 9 216.6 5 12 0.04811 0.0017 0.21919 0.0018 0.03321 0.0017 104.6 61 201.2 10 210.6 4 13 0.09154 0.0019 0.45992 0.0009 0.03662 0.0025 1457.7 22 384.2 12 231.8 19 14 0.04999 0.0009 0.22962 0.0020 0.03347 0.0013 194.6 79 209.9 8 212.2 3 15 0.109 0.0022 0.49206 0.0017 0.03289 0.0008 1782.8 19 406.3 11 208.6 22 16 0.17082 0.0027 0.88813 0.0015 0.03788 0.0014 2565.7 35 645.4 14 239.7 4 17 0.04642 0.0015 0.21043 0.0013 0.03303 0.0014 19.4 51 193.9 23 209.5 21 18 0.31219 0.0014 1.74701 0.0008 0.04077 0.0016 3531.8 35 1026.1 10 257.6 9 19 0.05128 0.0018 0.24089 0.0014 0.03423 0.0013 253.5 22 219.2 12 216.9 18 20 0.13437 0.0014 0.67404 0.0014 0.03655 0.0014 2155.9 22 523.2 10 231.4 16 21 0.05948 0.0015 0.27601 0.0016 0.0338 0.0014 584.8 68 247.5 24 214.3 7 22 0.05505 0.0016 0.26084 0.0013 0.03452 0.0023 414.3 65 235.3 22 218.7 14 23 0.0486 0.0013 0.2303 0.0012 0.03452 0.0012 128.8 57 210.4 26 218.8 23 24 0.05352 0.0017 0.24165 0.0015 0.03289 0.0025 350.7 48 219.8 18 208.6 19 25 0.05181 0.0025 0.23784 0.0017 0.03343 0.0017 277.2 41 216.6 12 212 19
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