LA-ICP-MS zircon U-Pb ages of the granites from Mashan of Inner Mongolia and their geological significances
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摘要:
对内蒙古北山南带东段的马山花岗岩体进行了LA-ICP-MS 锆石U-Pb 年代学和岩石地球化学研究，结果表明，马山花岗岩以花岗闪长岩为主，偏铝质-过铝质，中钾钙碱性特征，具有较高的SiO2(64.85%~79.17%)、Na2O+K2O(5.13%~6.62%)，富钠(Na2O/K2O>1)；在球粒陨石标准化配分模式图上，配分曲线相对平缓，富集轻稀土元素，重稀土元素分馏不明显且相对亏损，δEu=0.65~0.91，具有弱Eu 负异常；在微量元素原始地幔标准化蛛网图上，亏损Ba、Nb、Ta、P、Ti，富集Rb、Th、U、K。通过LA-ICP-MS 锆石U-Pb 测年，马山花岗岩体的侵位年龄为281.8±3.2Ma。结合区域地质背景，认为马山花岗岩体是壳幔混合成因的，形成于早二叠世后碰撞伸展体制之下，北山南带于早二叠世晚期进入后碰撞裂谷伸展发育阶段。
Abstract:This paper reports LA-ICP-MS zircon U-Pb ages and geochemistry of the granite in Mashan, east of the southern Beishan, Inner Mongolia, with the purpose of constraining its formation age and petrogenesis. The results show that the granitic body mainly consists of granodiorite which belongs to middle-K calc-alkaline series with metaluminous-peraluminous characteristics and high content of SiO2(64.85%~79.17%), Na2O+K2O (5.13%~6.62%) and Na2O/K2O>1. In addition, the granite invariably exhibits relatively gentle light rare earth elements (LREE) enrichment with flat heavy rare earth element (HREE) and weak negative Eu anomalies (δEu=0.65~0.91) in the chondrite-normalized REE patterns, depletion of Ba, Nb, Ta, P, Ti and enrichment of Rb, Th, U, K in the spidergram. The LA-ICP-MS zircon U-Pb age of the granite is 281.8±3.2Ma. Based on regional geology, the above characteristics indicate that the Mashan granite was the mixing product of crustal and mantle derived magmas and was formed under the tectonic setting of post-collisional extension in Early Permian. This implies that the east of southern Beishan Mountain turned to the stage of rift in post-collisional extensional period during Early Permian.
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表 1 马山花岗岩体LA-ICP-MS 锆石(TW01) U-Th-Pb 同位素数据
Table 1. LA-ICP-MS zircon U-Th-Pb dating data of granite from Mashan（TW01）
分析点 含量/10-6 232Th/238U 207Pb/235U 206Pb/238U 207Pb/235U 206Pb/238U 232Th 238U 比值 1σ 比值 1σ 年龄/Ma 1σ 年龄/Ma 1σ TW01-1 280.96 449.94 0.62 9.3972 0.2158 0.4182 0.0092 2377.6 21.07 2252.3 41.73 TW01-2 523.95 1099.59 0.48 0.3621 0.0089 0.0437 0.0010 313.8 6.64 275.4 5.97 TW01-3 375.06 699.75 0.54 0.3941 0.0100 0.0456 0.0010 337.4 7.29 287.1 6.31 TW01-4 594.83 576.85 1.03 0.8243 0.0212 0.0526 0.0012 610.4 11.79 330.4 7.55 TW01-5 349.29 359.94 0.97 0.3703 0.0110 0.0431 0.0010 319.9 8.13 272 6.38 TW01-6 92.39 154.58 0.60 0.4218 0.0152 0.0456 0.0012 357.3 10.86 287.3 7.47 TW01-7 401.97 1310.93 0.31 0.3223 0.0078 0.0438 0.0010 283.7 6.01 276.4 5.96 TW01-8 191.06 372.5 0.51 0.3463 0.0101 0.0438 0.0010 301.9 7.58 276.3 6.38 TW01-9 292.29 294.14 0.99 0.3421 0.0102 0.0444 0.0011 298.8 7.73 280 6.53 TW01-10 99.79 354.71 0.28 0.3287 0.0093 0.0409 0.0010 288.5 7.14 258.4 5.96 TW01-11 408.08 804.03 0.51 0.3764 0.0095 0.0436 0.0010 324.4 7.02 275 6.06 TW01-12 49.69 106.02 0.47 0.4079 0.0170 0.0409 0.0012 347.4 12.27 258.2 7.6 TW01-13 133.16 156.37 0.85 0.4344 0.0141 0.0433 0.0011 366.3 10 273 6.93 TW01-14 81.57 213.17 0.38 0.5080 0.0149 0.0603 0.0015 417.1 10.03 377.7 8.81 TW01-15 291.58 308.2 0.95 0.3552 0.0104 0.0437 0.0010 308.6 7.79 275.7 6.45 TW01-16 252.32 605.27 0.42 0.3590 0.0094 0.0429 0.0010 311.5 7 270.7 6.04 TW01-17 660.33 1444.13 0.46 0.4373 0.0104 0.0461 0.0010 368.4 7.36 290.5 6.29 TW01-18 216.72 353.49 0.61 0.4315 0.0124 0.0451 0.0011 364.2 8.77 284.6 6.69 TW01-19 477.93 938.69 0.51 0.3581 0.0090 0.0457 0.0010 310.8 6.72 287.9 6.32 TW01-20 212.5 325.28 0.65 0.3001 0.0098 0.0413 0.0010 266.4 7.68 260.8 6.33 TW01-21 108.44 260.92 0.42 0.3980 0.0129 0.0456 0.0012 340.2 9.38 287.2 7.13 TW01-22 158.92 169.8 0.94 0.4177 0.0160 0.0467 0.0013 354.4 11.43 294 8.04 TW01-23 372.22 946.18 0.39 0.3493 0.0087 0.0449 0.0010 304.2 6.53 283.2 6.21 TW01-24 315.24 351.81 0.90 0.4617 0.0139 0.0457 0.0011 385.5 9.65 288.2 7.02 TW01-25 261.36 418.89 0.62 0.3418 0.0098 0.0458 0.0011 298.6 7.41 288.6 6.66 TW01-26 157.57 259.58 0.61 0.3533 0.0108 0.0458 0.0011 307.2 8.13 288.7 6.87 TW01-27 157.3 231.78 0.68 0.3569 0.0112 0.0456 0.0011 309.9 8.4 287.7 6.93 TW01-28 77.52 182.09 0.43 4.3637 0.1037 0.2902 0.0066 1705.5 19.64 1642.3 32.72 
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表 2 马山花岗岩体主量、微量和稀土元素分析结果
Table 2. Analytical data of major, trace, and rare earth elements of granite from Mashan
样品号
岩石名称P1/GS1
花岗质碎裂岩P1/GS3
花岗质碎岩P13/GS3
中粗粒花岗闪长岩P13/GS5
中粗粒花岗闪长岩P16/GS1、XT1
黑云母花岗闪长岩P16/GS2、XT2
黑云母花岗闪长岩SiO2 65.48 68.06 69.75 69.21 64.85 66.77 Al2O3 15.00 13.55 14.09 14.33 15.30 15.49 Fe2O3 1.40 1.13 1.95 2.08 3.41 3.01 FeO 3.44 3.02 1.68 1.75 2.22 1.88 TiO2 0.76 0.62 0.41 0.43 0.56 0.53 MgO 2.55 2.05 1.36 1.20 1.78 1.62 CaO 3.92 2.93 3.15 3.57 3.48 3.25 P2O5 0.16 0.16 0.07 0.09 0.12 0.12 K2O 1.90 2.71 2.40 2.29 2.21 1.90 MnO 0.09 0.07 0.07 0.08 0.08 0.07 Na2O 3.23 2.66 3.74 3.67 4.05 4.72 烧失量 1.55 3.72 0.82 0.54 1.60 1.29 总量 99.46 100.69 99.49 99.23 99.66 100.65 A/CNK 1.04 1.07 0.97 0.96 0.99 0.99 NK/A 0.49 0.54 0.62 0.59 0.59 0.63 σ 1.17 1.15 1.41 1.35 1.79 1.84 Rb 88.84 114.35 75.02 170.00 47.34 48.32 Ba 430.78 435.03 370.10 481.29 109.25 283.55 Th 12.55 13.66 8.49 17.14 6.92 4.94 U 2.10 1.30 1.44 3.79 1.68 1.40 Nb 13.36 11.54 5.78 12.36 5.75 4.42 Ta 1.18 1.20 0.62 1.28 0.64 0.49 Sr 255.42 139.70 209.88 195.36 291.65 226.93 Zr 143.82 72.81 127.41 374.10 196.08 185.01 V 101.52 64.53 71.65 23.01 78.67 64.00 Cr 54.31 43.16 22.04 21.90 18.38 22.06 Co 13.38 6.74 6.29 1.34 10.11 7.72 Cu 15.99 16.80 7.21 3.16 22.49 17.54 Zn 76.13 53.91 33.03 41.80 47.13 39.88 Ga 18.83 16.43 15.27 16.56 14.36 13.37 La 18.00 18.59 15.70 12.85 14.47 13.48 Ce 24.17 31.86 31.06 19.91 37.94 34.31 Pr 5.07 4.90 3.65 3.23 4.69 3.94 Nd 19.47 18.51 14.39 12.23 18.34 15.69 Sm 4.14 4.16 3.01 2.83 3.94 3.60 Eu 1.08 0.85 0.86 0.74 0.91 0.90 Gd 3.76 3.84 2.77 2.56 3.31 3.16 Tb 0.74 0.81 0.55 0.48 0.60 0.59 Dy 4.40 4.95 3.57 3.00 3.52 3.57 Ho 0.88 1.00 0.81 0.66 0.75 0.76 Er 2.80 3.34 2.57 2.21 2.08 2.10 Tm 0.40 0.55 0.37 0.34 0.34 0.33 Yb 2.49 3.19 2.70 2.06 2.29 2.28 Lu 0.40 0.45 0.38 0.33 0.36 0.36 Y 23.71 28.29 20.30 17.14 19.75 20.25 REE 111.51 125.29 102.69 80.57 113.29 105.31 LREE 71.93 78.87 68.67 51.79 80.29 71.91 HREE 39.58 46.42 34.02 28.78 33.00 33.39 LREE/HREE 1.82 1.70 2.02 1.80 2.43 2.15 (La/Yb)N 5.19 4.18 4.17 4.47 4.54 4.25 (La/Sm)N 2.81 2.88 3.37 2.93 2.37 2.42 (Gd/Yb)N 1.25 1.00 0.85 1.03 1.20 1.15 δEu 0.84 0.65 0.91 0.84 0.77 0.82 注：元素由中国冶金地质总局西北地质勘查院测试中心测定；δEu=EuN/SQRT（SmN∗GdN）；主量元素含量单位为%，微量和稀土元素为10-6
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