Study on Geochronology, Rock Genesis and Tectonic Background of Luocheng Granodiorite in Longshou Mountain Tectonic Belt
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摘要:
阿拉善地块龙首山成矿带大地构造位置处于华北板块、祁连造山带及中亚造山带的结合部，其所处构造环境的特殊性对区域构造演化及板块运动有着重大意义。该地区的岩浆演化及构造背景研究较为薄弱，笔者对罗城黑云母花岗闪长岩开展了岩石地球化学和锆石U-Pb定年及Lu-Hf同位素研究工作，LA-ICP-MS锆石U-Pb测年显示结果为（289±3）Ma（MSWD=0.57），侵位时间为早二叠世。罗城花岗闪长岩为准铝质，钙碱性系列，Mg#值介于0.64～0.66，显示I型花岗岩特征。研究区这些早二叠世花岗闪长岩显示出轻稀土元素相对富集和重稀土元素相对亏损的特征，LREE/HREE值为4.20～5.30，（La/Yb）N为3.69～5.46，并且具有轻微Eu 负异常（δEu：0.80～0.96）。原始地幔标准化图解中，这些样品相对富集大离子亲石元素（Rb、Th和K等），亏损高场强元素（Nb、Ta、Ti和P等），显示俯冲相关的弧岩浆地球化学特征。罗城地区早二叠世侵入岩具有正的εHf（t）值（+4.37 to +6.88）和相对年轻的二阶段模式年龄（T（DMC）=808.6～952.5 Ma）。野外地质特征结合地球化学数据表明罗城花岗闪长岩为壳源岩浆与幔源岩浆发生混合作用的产物。结合区域背景和前言研究数据分析，阿拉善西部龙首山构造带早二叠世时可能还存在与俯冲有关的弧岩浆活动。
Abstract:The geotectonic location of Longshou Mountain Metallogenic Belt of the Alxa Massif is at the junction of the North China Plate, the Qilian Orogenic Belt, and the Central Asian Orogenic Belt, and the particularity of the tectonic environment is of great significance to the regional tectonic evolution and plate movement. The magmatic evolution and tectonic background of this area are not well studied. The author has carried out studies on the rock geochemistry, zircon U-Pb dating, and Lu-Hf isotope of Luocheng biotite granodiorite. LA-ICP-MS zircon U-Pb dating shows a value of (289±3)Ma (MSWD=0.57), and the emplacement time of the rock is in the Early Permian. Luocheng Granodiorite is quasi aluminous, calc alkaline series, with Mg# value between 0.64-0.66, showing the characteristics of I-type granite. These early Permian Granodiorite in the study area show the characteristics of relative enrichment of light REE and relative depletion of heavy REE, LREE/HREE ratio was 4.20-5.30, and (La/Yb) N was 3.69-5.46, And it has a slight negative Eu anomaly(δEu: 0.80-0.96). In the standardized diagram of the primitive mantle, In the standardized diagram of the original mantle, these samples are relatively rich in large ion lithophile elements (Rb, Th, K, etc.) and depleted in high field strength elements (Nb, Ta, Ti, P, etc.), showing the geochemical characteristics of subduction related arc magmas. The early Permian intrusive rocks in the Luocheng area have positive ε The Hf (t) value (+4.37 to+6.88) and the relatively young two-stage mode age (T (DMC)=808.6 to 952.5 Ma). Field geological characteristics and geochemical data show that Luocheng Granodiorite is the product of mixing of crust derived magma and mantle derived magma. Based on the analysis of regional background and foreword research data, it is possible that arc magmatic activity related to subduction existed in the Longshoushan tectonic belt in the western part of Alxa during the Early Permian.
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Key words:
- granodiorite /
- geochemistry /
- Hf isot-opic /
- LongShou Mountain /
- tectonic evolution
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图 6 罗城黑云母花岗闪长岩Q-A-P图解（a）（据Streckeisen, 1976）、SiO2-（Na2O+K2O-CaO）图解（b）（据Peccerillo et al., 1976）、SiO2-K2O图解（c）（据Peccerillo et al., 1976）及A/NK-A/CNK图解（d）（据Maniar et al.，1989）
Figure 6.
图 7 罗城黑云母花岗闪长岩的稀土元素球粒陨石标准化配分曲线图（a）（据Taylor et al., 1985）和微量元素原始地幔标准化蛛网图（b）（据Sun et al., 1989）
Figure 7.
图 8 罗城黑云母花岗闪长岩K2O-Na2O图解（a）及Zr、Ce、Y-10000Ga图解（b、c、d）（据Whalen et al.，1987）
Figure 8.
图 9 罗城黑云母花岗闪长岩C/MF-A/MF图解（a）（据Alther et al., 2000）及δEu-（La/Yb）N图解（b）（据王钊飞等，2019）
Figure 9.
图 11 花岗闪长岩构造背景判别Rb-（Y+Nb）（a）、Nb-Y（b）（据Pearce et al., 1984）、Hf-Rb/30-3Ta（c）（据Harris et al., 1986）图解及R1-R2（d）（据Batchelor et al., 1985）图解
Figure 11.
表 1 罗城黑云母花岗闪长岩主量元素（%）、微量元素（10−6）、稀土元素（10−6）分析结果表
Table 1. Analysis results of major elements （%）, trace elements (10−6) and rare earth elements (10−6) in Luocheng biotite granodiorite
样品编号 LCYT03 LCYT04 LCYT05 LCYT06 SiO2 59.84 58.75 58.52 59.09 Al2O3 16.91 17.25 17.28 17.28 Fe2O3 7.13 7.82 7.55 7.61 CaO 6.33 6.70 6.93 6.68 MgO 3.13 3.38 3.53 3.34 K2O 1.87 1.49 1.49 1.54 Na2O 2.52 2.60 2.55 2.60 P2O5 0.13 0.15 0.15 0.15 TiO2 0.68 0.74 0.77 0.75 MnO 0.13 0.14 0.14 0.14 LOI 1.03 0.74 0.85 0.60 总和 99.70 99.76 99.75 99.79 K2O+Na2O 4.40 4.09 4.04 4.15 K2O/Na2O 0.74 0.57 0.59 0.59 δ 1.15 1.06 1.05 1.07 A/NK 2.74 2.93 2.98 2.9 A/CNK 0.97 0.97 0.96 0.97 Rb 61.1 49.2 40.6 46.9 Th 3.37 4.58 5.70 8.46 U 0.79 0.72 0.74 0.75 Nb 4.48 4.76 4.64 4.64 Sr 376 429 413 403 Zr 84.3 112 88.6 118 Hf 2.34 2.79 2.23 2.97 F 454 320 663 360 Sn ＜1.80 ＜1.80 ＜1.80 ＜1.80 Cr 12.9 17.6 14.1 14.1 Li 16.8 18.3 17.3 17.4 Be 0.76 0.87 0.86 0.79 V 166 186 180 174 Co 15.3 16.2 15.6 15.3 Ni 8.36 10.9 11.2 10.4 Ga 16.6 17.7 16.3 16.4 Cs 2.52 2.92 2.69 3.15 Ta 0.33 0.35 0.34 0.35 W 2.30 1.91 1.81 1.80 Bi 0.073 0.070 ＜0.050 0.057 La 12.0 14.3 12.5 12.5 Ce 27.1 28.9 25.5 25.7 Pr 3.60 3.59 3.32 3.21 Nd 16.4 15.3 14.6 14.1 Sm 3.91 3.37 3.28 3.14 Eu 1.05 1.07 1.05 1.03 Gd 4.14 3.54 3.49 3.41 Tb 0.66 0.55 0.54 0.52 Dy 4.04 3.28 3.24 3.15 Ho 0.83 0.68 0.67 0.65 Er 2.54 2.03 2.02 1.95 Tm 0.36 0.29 0.29 0.28 Yb 2.33 1.88 1.87 1.84 Lu 0.36 0.30 0.30 0.29 Y 21.3 17.2 16.9 16.4 ΣREE 79.32 79.08 72.67 71.77 LREE 64.06 66.53 60.25 59.68 HREE 15.26 12.55 12.42 12.09 LREE/HREE 4.20 5.30 4.85 4.94 (La/Yb)N 3.69 5.46 4.79 4.87 δEu 0.80 0.95 0.95 0.96 δCe 1.01 0.99 0.97 0.99 
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表 2 罗城花岗闪长岩（LCYT01）锆石LA-ICP-MS测年结果
Table 2. Zircon LA-ICP-MS dating results of Luocheng granodiorite (LCYT01)
测点号 含量（10−6） Th/U 同位素比值 同位素年龄 Pb Th U 207Pb/206Pb ±1δ 207Pb/235U ±1δ 206Pb/238U ±1δ 208Pb/232Th ±1δ 207Pb/206Pb ±1δ 207Pb/235U ±1δ 206Pb/238U ±1δ 208Pb/232Th ±1δ LCYT001 15.96 79.28 81.67 0.97 0.05153 0.00423 0.32079 0.02551 0.04511 0.00102 0.01452 0.00048 264.4 177.81 282.5 19.61 284.5 6.28 291.3 9.56 LCYT002 14.25 47.28 72.22 0.65 0.05202 0.0046 0.32939 0.02827 0.04589 0.00108 0.01269 0.00063 286.1 189.7 289.1 21.59 289.2 6.68 255 12.64 LCYT003 12.04 34.81 63.55 0.55 0.0524 0.00697 0.32463 0.04227 0.0449 0.00134 0.01375 0.00088 302.7 277.82 285.5 32.4 283.2 8.26 276.1 17.48 LCYT004 19.92 93.99 98.06 0.96 0.04923 0.00498 0.31772 0.03138 0.04678 0.00114 0.01432 0.00059 158.7 220.85 280.1 24.18 294.7 7.05 287.5 11.7 LCYT005 11.37 41.91 57.97 0.72 0.0517 0.00762 0.33365 0.04817 0.04678 0.00152 0.01611 0.00095 272.2 306.78 292.4 36.67 294.7 9.39 323 18.95 LCYT006 16.79 80.92 85.36 0.95 0.05021 0.00438 0.31261 0.02651 0.04513 0.00103 0.01345 0.00049 204.9 190.68 276.2 20.51 284.6 6.35 270 9.73 LCYT007 27.09 129.66 147.36 0.88 0.05412 0.00356 0.342 0.0216 0.04582 0.00096 0.01384 0.00042 375.8 141.54 298.7 16.34 288.8 5.93 277.8 8.4 LCYT008 12.51 45.55 65.96 0.69 0.05029 0.0043 0.32015 0.0266 0.04616 0.00106 0.01535 0.00062 208.3 187.16 282 20.46 290.9 6.51 307.8 12.31 LCYT009 13.69 45.68 72.34 0.63 0.05153 0.00444 0.33081 0.02763 0.04656 0.00109 0.01519 0.00068 264.4 186.14 290.2 21.08 293.3 6.73 304.7 13.59 LCYT010 12.68 46.02 66.65 0.69 0.05115 0.00472 0.33038 0.0297 0.04685 0.00111 0.01457 0.00063 247.4 199.46 289.9 22.67 295.1 6.83 292.5 12.53 LCYT011 13.09 49.92 68.97 0.72 0.04792 0.00563 0.30937 0.03563 0.04682 0.00122 0.01473 0.00087 94.2 257.92 273.7 27.63 295 7.49 295.6 17.3 LCYT012 12.53 47.8 65.53 0.73 0.0521 0.00482 0.33683 0.03033 0.04689 0.00112 0.01606 0.00063 289.7 198 294.8 23.04 295.4 6.87 322 12.57 LCYT013 18.31 92.71 98.11 0.94 0.05178 0.0039 0.32956 0.02399 0.04618 0.001 0.01362 0.00044 275.6 163.56 289.2 18.32 291 6.19 273.3 8.78 LCYT014 19 93.38 105.35 0.89 0.05329 0.00398 0.3273 0.02358 0.04457 0.00099 0.01433 0.00046 340.9 160.32 287.5 18.04 281.1 6.09 287.6 9.21 LCYT015 15.16 51.53 80.72 0.64 0.04948 0.00412 0.30521 0.02472 0.04476 0.00098 0.01424 0.00055 170.8 183.56 270.5 19.23 282.3 6.06 285.7 11.06 LCYT016 14.01 55.43 76.33 0.73 0.0503 0.00537 0.30848 0.03208 0.04451 0.00118 0.01286 0.00065 209 229.96 273 24.9 280.7 7.27 258.2 12.91 LCYT017 11.3 45.88 60.72 0.76 0.05239 0.00499 0.33231 0.03079 0.04604 0.00115 0.01288 0.0006 302.4 203.45 291.3 23.47 290.1 7.1 258.6 11.9 LCYT018 16.38 73.42 88.24 0.83 0.05321 0.0037 0.3292 0.02201 0.0449 0.00096 0.01409 0.00044 337.7 149.52 289 16.81 283.2 5.92 282.7 8.81 LCYT019 15.81 76.58 80.92 0.95 0.05166 0.00378 0.32813 0.02317 0.0461 0.00099 0.01466 0.00044 270.4 159.18 288.1 17.72 290.6 6.07 294.2 8.75 LCYT020 13.2 53.42 68.41 0.78 0.05023 0.00423 0.31534 0.02582 0.04557 0.00103 0.0151 0.00054 205.7 184.61 278.3 19.93 287.3 6.36 302.9 10.68 LCYT021 10.77 36.85 52.88 0.70 0.05095 0.0044 0.32225 0.02702 0.04592 0.00105 0.01367 0.00064 238.6 187.4 283.6 20.75 289.4 6.46 274.3 12.67 LCYT022 13.95 47.61 68.78 0.69 0.05283 0.00388 0.34372 0.02436 0.04724 0.00102 0.01389 0.00055 321.3 157.94 300 18.41 297.6 6.25 278.8 10.94 LCYT023 23.03 103.73 117.27 0.88 0.05235 0.00313 0.33694 0.01926 0.04673 0.00094 0.01421 0.00041 300.6 130.55 294.9 14.63 294.4 5.77 285.2 8.1 LCYT024 16.81 56.88 85.69 0.66 0.05387 0.00347 0.34195 0.02113 0.04609 0.00095 0.01337 0.00048 365.6 138.52 298.6 15.99 290.5 5.83 268.4 9.65 LCYT025 14.8 67.05 76.38 0.88 0.05203 0.00384 0.33011 0.02359 0.04608 0.00099 0.01419 0.00047 286.8 160.34 289.7 18 290.4 6.11 284.8 9.33
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表 3 罗城花岗闪长岩锆石分析点位微量元素（10−6）测试结果
Table 3. Test results of trace elements (10−6) at zircon analysis points of Luocheng granodiorite
测点号 Nb La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Ta LCYT001 1.10 0.06 8.23 0.05 0.23 0.49 1.28 27.74 0.78 107.27 40.27 181.12 35.88 339.17 66.63 0.28 LCYT002 0.49 0.04 6.69 0.03 2.07 3.33 0.40 11.13 8.82 67.14 26.56 126.02 27.32 290.78 57.98 0.24 LCYT003 0.61 0.00 6.26 0.02 0.49 2.64 0.29 7.43 4.65 45.16 17.35 87.13 19.02 192.36 38.24 0.27 LCYT004 0.63 0.06 9.25 0.08 0.44 0.69 1.15 25.90 3.00 112.88 44.64 196.44 39.56 377.09 71.61 0.26 LCYT005 0.55 0.00 6.42 0.03 1.79 4.98 0.36 8.45 9.99 40.51 19.27 87.53 19.76 189.52 37.30 0.23 LCYT006 0.52 0.01 9.03 0.05 0.63 1.34 0.91 24.92 3.67 102.58 38.80 175.98 35.30 323.64 65.73 0.28 LCYT007 0.46 0.02 17.04 0.11 1.55 2.65 0.85 24.04 6.96 113.49 45.17 206.58 43.34 418.84 82.25 0.41 LCYT008 1.37 0.00 7.31 0.03 1.49 3.08 0.46 10.50 8.69 50.85 20.86 97.32 21.63 218.50 42.57 0.30 LCYT009 0.53 0.04 7.76 0.02 0.67 1.58 0.24 7.99 4.06 43.08 18.56 85.81 19.58 193.52 36.74 0.31 LCYT010 0.65 0.00 7.39 0.03 0.40 1.28 0.24 11.38 3.43 52.67 20.97 98.21 22.28 213.94 42.28 0.26 LCYT011 0.67 0.01 7.65 0.05 0.44 2.14 0.43 11.65 4.08 54.24 22.14 101.02 21.59 221.82 41.65 0.21 LCYT012 0.58 0.24 7.21 0.07 0.73 1.88 0.48 9.62 4.43 51.70 20.95 100.70 22.19 222.33 43.83 0.39 LCYT013 3.01 0.01 9.21 0.08 1.56 2.82 0.95 24.93 3.94 113.56 45.37 198.15 41.36 399.32 71.97 0.38 LCYT014 0.66 0.01 9.65 0.07 1.79 3.63 1.15 28.87 9.60 117.65 44.48 198.85 41.00 392.05 76.11 0.34 LCYT015 0.58 0.00 8.44 0.02 2.16 4.68 0.33 10.50 9.83 52.88 20.95 100.98 22.47 230.32 44.42 0.31 LCYT016 0.74 0.00 7.73 0.04 0.49 1.29 0.40 12.46 4.08 61.43 26.20 120.97 26.57 261.96 52.64 0.38 LCYT017 0.73 0.00 6.93 0.02 0.87 2.13 0.43 12.06 5.04 54.07 23.41 106.05 23.33 232.88 44.25 0.33 LCYT018 0.84 0.01 8.09 0.06 0.57 1.82 0.83 20.89 4.58 92.58 36.57 172.39 35.31 347.52 67.40 0.29 LCYT019 0.61 0.00 8.04 0.06 1.53 3.32 0.97 26.28 7.25 103.33 41.09 175.93 36.48 349.56 66.29 0.23 LCYT020 0.47 0.00 7.31 0.02 1.72 5.06 0.39 14.22 8.78 63.23 24.83 115.49 25.21 238.91 45.30 0.22 LCYT021 0.57 0.01 5.70 0.02 0.69 1.87 0.53 10.94 5.15 53.16 21.38 104.62 22.91 221.56 45.69 0.30 LCYT022 0.53 0.04 6.60 0.03 0.27 1.73 0.46 12.33 3.89 67.24 25.79 122.86 27.12 273.00 52.93 0.28 LCYT023 0.70 0.04 9.56 0.09 0.57 1.92 1.18 27.41 5.00 122.96 49.00 227.37 46.39 456.07 89.13 0.38 LCYT024 1.14 0.04 8.63 0.02 1.85 4.19 0.28 9.30 10.49 48.68 20.06 95.23 20.74 214.10 41.88 0.34 LCYT025 1.12 0.02 7.63 0.07 1.41 2.91 1.04 22.23 4.01 93.47 36.23 160.65 34.00 327.88 65.05 0.25
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表 4 黑云母花岗闪长岩锆石Hf同位素分析结果
Table 4. Zircon Hf isotope analysis results of biotite granodiorite
分析点 t（Ma） 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf ±2σ Hfi εHf （0） εHf （t） ±1σ T（DM1） T（DMC） ±1σ fLu/Hf LCYT01-01 284.5 0.018558653 0.000625497 0.282772262 0.0000194150 0.282769 0.079994272 6.14162 0.679525 634.4 846.8 0.06673 - 0.9583 LCYT01-02 289.2 0.021350813 0.00072988 0.282742229 0.0000173343 0.282738 - 0.982120012 5.16050 0.606701 676.8 910.5 0.065471 - 0.95134 LCYT01-03 283.2 0.018541903 0.0006332 0.282761526 0.0000162177 0.282758 - 0.299686693 5.73214 0.56762 649.0 871.0 0.062774 - 0.95779 LCYT01-04 294.7 0.022088228 0.000738473 0.282787588 0.0000174089 0.282784 0.621999168 6.88254 0.609311 615.4 808.6 0.063449 - 0.95077 LCYT01-05 294.7 0.016473205 0.000610408 0.282734375 0.0000178101 0.282731 - 1.259864349 5.02445 0.623354 685.4 922.9 0.066228 - 0.95931 LCYT01-06 284.6 0.03087808 0.00103004 0.282748701 0.0000169380 0.282743 - 0.753226632 5.23386 0.59283 673.2 902.5 0.065308 - 0.93133 LCYT01-07 288.8 0.019725731 0.000669661 0.282759209 0.0000166409 0.282756 - 0.381620593 5.76427 0.582432 652.8 873.1 0.063558 - 0.95536 LCYT01-08 290.9 0.025750031 0.000867335 0.282742988 0.0000180678 0.282738 - 0.955258813 5.19757 0.632374 678.1 909.3 0.066791 - 0.94218 LCYT01-09 293.3 0.021818077 0.00074069 0.282752659 0.0000170188 0.282749 - 0.61326993 5.61588 0.595659 662.8 885.4 0.06456 - 0.95062 LCYT01-10 295.1 0.031810315 0.001072333 0.282760072 0.0000185273 0.282754 - 0.35109486 5.85224 0.648455 658.3 872.0 0.067113 - 0.92851 LCYT01-11 295 0.032320695 0.00106083 0.282770029 0.0000187588 0.282764 0.001027859 6.20471 0.656558 644.5 850.3 0.066935 - 0.92928 LCYT01-12 295.4 0.025753941 0.00084072 0.282744619 0.0000195056 0.28274 - 0.897570925 5.35710 0.682698 675.5 902.8 0.068675 - 0.94395 LCYT01-13 291 0.042050552 0.001378472 0.282744602 0.0000188351 0.282737 - 0.898174811 5.15840 0.659227 684.9 911.5 0.069048 - 0.9081 LCYT01-14 281.1 0.025917388 0.000895112 0.282777258 0.0000173229 0.282773 0.256671065 6.19473 0.606302 631.9 840.9 0.064172 - 0.94033 LCYT01-15 282.3 0.012222351 0.00042471 0.282730661 0.0000185893 0.282728 - 1.391186427 4.65946 0.650625 687.1 936.4 0.06705 - 0.97169 LCYT01-16 280.7 0.026071795 0.00089378 0.282726048 0.0000187777 0.282721 - 1.5543273 4.37430 0.65722 701.7 952.5 0.068661 - 0.94041 LCYT01-17 290.1 0.026377494 0.000892334 0.282753361 0.0000177671 0.282749 - 0.588435111 5.54265 0.621848 664.4 887.5 0.065933 - 0.94051 LCYT01-18 283.2 0.024916918 0.000880457 0.282778938 0.0000203212 0.282774 0.316093287 6.30197 0.711244 629.4 835.9 0.068288 - 0.9413 LCYT01-19 290.6 0.018210323 0.000633771 0.282781801 0.0000175364 0.282778 0.417339793 6.60951 0.613775 621.6 822.4 0.063668 - 0.95775 LCYT01-20 287.3 0.01802085 0.000615423 0.282772775 0.0000170572 0.282769 0.098119936 6.22222 0.597003 633.5 843.9 0.06338 - 0.95897 LCYT01-21 289.4 0.020384277 0.000718113 0.282742372 0.0000184710 0.282738 - 0.9770409 5.17215 0.646485 676.4 909.9 0.067032 - 0.95213 LCYT01-22 297.6 0.02594746 0.000881354 0.282760012 0.0000161587 0.282755 - 0.353235735 5.94105 0.565556 655.2 868.5 0.063322 - 0.94124 LCYT01-23 294.4 0.029427132 0.001014853 0.282726672 0.0000206482 0.282721 - 1.532286504 4.66656 0.722688 703.0 944.4 0.071574 - 0.93234 LCYT01-24 290.5 0.018539508 0.000641115 0.282769911 0.0000162977 0.282766 - 0.003162189 6.18517 0.570421 637.8 848.5 0.062508 - 0.95726 LCYT01-25 290.4 0.021881036 0.000749457 0.282741158 0.0000155788 0.282737 - 1.019970646 5.14473 0.545259 678.6 912.3 0.063102 - 0.95004
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