Zircon U- Pb age and geological significance of quartz monzonite from Qingjianpo, Shanxi Province
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摘要:
通过对华北克拉通北缘青尖坡石英二长岩锆石U-Pb同位素年龄分析, 并结合相关主量和稀土元素数据探讨其地质意义。研究表明, 石英二长岩LA-ICP-MS锆石U-Pb同位素年龄为241.1±1.7Ma, 为早中三叠世岩浆活动的产物。岩石具有富K、Na、Si、Al, 贫Mg、Ca、Ti等特征, 为高钾碱性钾玄岩系列, 属于过铝质花岗岩类；轻稀土元素相对富集, 重稀土元素相对亏损, 具有稳定的弱负Eu异常。总体为I型花岗岩成因, 但兼具S型花岗岩的特征。青尖坡石英二长岩为中下地壳部分熔融成因, 有地幔物质参与, 为华北克拉通北缘三叠纪碱性岩带的组成部分, 形成于晚造山-造山后的伸展构造环境。
Abstract:In this paper, based on the study of Qingjianpo quartz monzonite of zircon U-Pb isotope age, and combine with the major element data and rare earth elementdata, the authors investigated its geological significance. The LA-ICP-MS zircon U-Pb isotopic age of quartz monzonite is 241.1±1.7Ma, revealing that it is a product of the Early-Middle Triassic magmatism. The rock is enriched in K, Na, Si, Al and depleted in Mg, Ca, Ti, belonging to high calc alkaline shoshonite series and peraluminous granitoid. The rock exhibits the enrichment of LREE relative to HREE, and Eu shows weak negative anomaly. The genetic type of Qingjianpo quartz monzonite is I-type granite. with some features of S-type granites. Qingjianpo quartz monzonite characteristics indicate that the rock was formed from partial melting of the mid-lower crust, with the addition of mantle material. Qingjianpo quartz monzonite is a part of the alkaline magmatic belt of Middle Triassic on the northern margin of North China Craton, and it was formed in the extensional tectonic environment of late orogenic-post-orogenic activity.
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表 1 青尖坡石英二长岩LA-ICP-MS锆石U-Th-Pb分析结果
Table 1. The LA-ICP-MS zircon U-Th-Pb result of the Qingjianpo quartz monzonite
测点号 元素含量/10-6 Th/U 同位素比值 年龄/Ma Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ RZ100-1 14.0 331.3 264.1 1.25 0.0513 0.0017 0.271 0.008 0.0384 0.0005 252.2 73.2 243.6 6.0 242.7 3.0 RZ100-2 18.1 597.7 290.7 2.06 0.0511 0.0019 0.268 0.009 0.0380 0.0005 243.7 84.9 241.0 7.2 240.7 3.2 RZ100-3 13.1 313.3 200.6 1.56 0.0511 0.0021 0.277 0.010 0.0393 0.0005 242.9 90.5 248.2 8.1 248.7 3.1 RZ100-4 9.5 230.6 140.6 1.64 0.0513 0.0024 0.270 0.011 0.0381 0.0006 254.9 102.6 242.3 9.1 241.0 3.5 RZ100-5 30.2 1054.4 473.2 2.23 0.0511 0.0018 0.272 0.009 0.0386 0.0005 243.7 80.4 244.0 6.8 244.0 3.0 RZ100-6 32.2 1303.5 466.3 2.8 0.0513 0.0015 0.271 0.007 0.0383 0.0005 251.9 66.9 243.1 5.3 242.2 3.0 RZ100-7 12.2 271.7 237.8 1.14 0.0508 0.0016 0.266 0.007 0.0381 0.0005 229.5 72.7 239.8 5.8 240.9 3.0 RZ100-8 19.8 575.3 364.3 1.58 0.0541 0.0014 0.268 0.005 0.0360 0.0004 374.1 56.4 241.1 4.1 227.7 2.7 RZ100-9 14.8 423.4 264.9 1.6 0.0509 0.0017 0.268 0.008 0.0382 0.0005 234.2 76.1 241.0 6.2 241.7 3.1 RZ100-10 13.1 329.6 240.8 1.37 0.0510 0.0021 0.268 0.010 0.0381 0.0005 242.7 90.5 241.2 7.8 241.0 3.3 RZ100-11 154.0 140.4 259.3 0.54 0.1635 0.0033 10.642 0.129 0.4721 0.0055 2, 492.0 33.9 2, 492.4 11.3 2, 492.6 24.0 RZ100-12 25.0 755.8 413.6 1.83 0.0508 0.0013 0.266 0.005 0.0380 0.0005 230.9 58.5 239.7 4.2 240.5 2.8 RZ100-13 25.7 979.4 359.6 2.72 0.0511 0.0018 0.273 0.008 0.0387 0.0005 247.0 78.1 245.0 6.6 244.8 2.9 RZ100-14 19.6 523.9 316.2 1.66 0.0513 0.0014 0.272 0.006 0.0385 0.0005 255.2 63.2 244.6 4.9 243.5 2.9 RZ100-15 17.1 523.2 244.2 2.14 0.0514 0.0015 0.270 0.006 0.0381 0.0005 260.1 65.4 242.7 5.1 240.9 2.9 RZ100-16 19.0 642.6 327.0 1.96 0.0510 0.0021 0.264 0.010 0.0375 0.0005 242.4 92.4 238.0 7.9 237.5 3.1 RZ100-17 17.5 488.1 278.8 1.75 0.0509 0.0020 0.264 0.010 0.0376 0.0005 236.9 90.0 237.9 7.7 237.9 3.0 RZ100-18 30.9 1234.3 427.2 2.89 0.0510 0.0013 0.267 0.005 0.0379 0.0005 240.5 59.1 240.1 4.3 240.0 2.8 RZ100-19 17.4 493.6 309.5 1.59 0.0512 0.0016 0.266 0.007 0.0377 0.0005 248.6 71.3 239.6 5.7 238.7 3.0 RZ100-20 22.5 1077.2 357.9 3.01 0.0510 0.0033 0.266 0.017 0.0378 0.0006 240.4 142.8 239.5 13.3 239.4 3.5 RZ100-21 13.7 368.5 199.6 1.85 0.0509 0.0019 0.269 0.009 0.0383 0.0005 234.3 81.7 241.7 6.9 242.5 3.1 RZ100-22 12.8 412.0 183.9 2.24 0.0513 0.0016 0.272 0.007 0.0384 0.0005 254.7 71.0 244.1 5.8 243.0 3.0 RZ100-23 21.5 748.7 319.8 2.34 0.0514 0.0017 0.272 0.007 0.0384 0.0005 259.0 72.3 244.5 5.9 243.0 3.1 RZ100-24 20.0 634.5 311.4 2.04 0.0518 0.0015 0.275 0.006 0.0385 0.0005 275.7 64.4 246.5 5.1 243.4 3.0 RZ100-25 17.0 606.3 319.5 1.90 0.0770 0.0020 0.377 0.007 0.0355 0.0004 1, 120.0 50.5 324.9 5.4 225.1 2.7 RZ100-26 24.1 1361.8 652.1 2.09 0.1470 0.0032 0.427 0.006 0.0210 0.0003 2, 311.1 36.9 360.7 4.3 134.2 1.6 RZ100-27 32.3 1062.5 448.3 2.37 0.0509 0.0018 0.271 0.008 0.0386 0.0005 235.0 77.4 243.1 6.5 243.9 2.9 注：第3、8、11、25、26号测点误差较大，不参加计算 
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表 2 青尖坡石英二长岩地球化学数据
Table 2. Whole-rock major, rare-earth elements data of Qingjianpo quartz monzonite
样品编号 岩石名称 采样位置 SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O RZ1100 石英二长岩 青尖坡 69.39 0.28 16.22 1.75 0.38 0.02 0.37 0.61 3.89 Ⅶ1yQ334 石英二长岩 青尖坡 68.06 0.24 16.02 1.71 0.86 0.01 0.96 0.53 4.04 H164 石英二长岩 青尖坡 67.5 0.5 15.93 2.06 1.05 0.08 0.44 0.61 6.08 Gs8138 石英二长岩 青尖坡 65.25 0.24 16.78 1.87 0.96 0.06 0.53 1.52 5.12 Ⅶ1yQ333 石英二长斑岩 青尖坡 71.47 0.22 14.87 0.63 0.9 0.01 0.9 0.29 3.4 HY-01 石英二长岩 胡窑 67.22 0.3 17.09 1.84 0.72 0.03 0.95 0.96 4.6 YQ01 石英二长(斑)岩 青尖坡 - - - - - - - - - YQ03 石英二长(斑)岩 羊爪沟 - - - - - - - - - 样品编号 岩石名称 采样位置 K2O P2O5 烧失量 总计 Na2O+K2O K2O/Na2O A/CNK A/NK RZ1100 石英二长岩 青尖坡 5.22 0.14 1.34 99.61 9.11 1.34 1.23 1.34 Ⅶ1yQ334 石英二长岩 青尖坡 6.14 0.08 1.52 100.17 10.18 1.52 1.12 1.20 H164 石英二长岩 青尖坡 4.1 0.18 2.43 99.66 10.18 0.67 1.02 1.10 Gs8138 石英二长岩 青尖坡 5.61 0.22 1.62 99.78 10.73 1.1 0.97 1.16 Ⅶ1yQ333 石英二长斑岩 青尖坡 5.55 0.08 1.43 99.75 8.95 1.63 1.22 1.28 HY-01 石英二长岩 胡窑 4.15 0.11 0.42 100.55 10.41 1.08 1.24 1.42 YQ01 石英二长(斑)岩 青尖坡 - - - - - - - - - YQ03 石英二长(斑)岩 羊爪沟 - - - - - - - - - 样品编号 岩石名称 采样位置 La Ce Pr Nd Sm Eu Gd Tb Dy RZ1100 石英二长岩 青尖坡 49.9 93 11.2 39.6 6.22 1.52 5.83 0.63 2.49 Ⅶ1yQ334 石英二长岩 青尖坡 - - - - - - - - - H164 石英二长岩 青尖坡 - - - - - - - - - Gs8138 石英二长岩 青尖坡 - - - - - - - - - Ⅶ1yQ333 石英二长斑岩 青尖坡 - - - - - - - - - HY-01 石英二长岩 胡窑 87 142 14.7 51.3 7.73 2.13 5.64 0.712 3.34 YQ01 石英二长(斑)岩 青尖坡 48.4 82.4 8.7 32 5.03 1.16 2.7 0.48 1.89 YQ03 石英二长(斑)岩 羊爪沟 40.2 70.4 6.13 25.7 3.96 0.8 2.09 0.3 1.76 样品编号 岩石名称 采样位置 HO Er Tm Yb Lu Y ΣREE LREE HREE RZ1100 石英二长岩 青尖坡 0.43 1.17 0.15 1.04 0.15 10.9 213.33 201.44 11.89 Ⅶ1yQ334 石英二长岩 青尖坡 - - - - - - - - - H164 石英二长岩 青尖坡 - - - - - - - - - Gs8138 石英二长岩 青尖坡 - - - - - - - - - Ⅶ1yQ333 石英二长斑岩 青尖坡 - - - - - - - - - HY-01 石英二长岩 胡窑 0.573 1.66 0.251 1.53 0.206 18.2 318.77 304.86 13.91 YQ01 石英二长(斑)岩 青尖坡 0.56 0.96 0.14 0.88 0.14 8.73 185.44 177.69 7.75 YQ03 石英二长(斑)岩 羊爪沟 0.35 1.97 0.14 0.98 0.13 9.36 154.91 147.19 7.72 样品编号 岩石名称 采样位置 LREE/HREE (La/Yb)N (La/Sm)N (Gd/Lu)N δEu δCe 数据来源 RZ1100 石英二长岩 青尖坡 16.94 32.35 5.05 4.98 0.77 0.95 本文 Ⅶ1yQ334 石英二长岩 青尖坡 — — — — — — ② H164 石英二长岩 青尖坡 — — — — — — ② Gs8138 石英二长岩 青尖坡 — — — — — — ② Ⅶ1yQ333 石英二长斑岩 青尖坡 — — — — — — ② HY-01 石英二长岩 胡窑 21.92 38.34 7.08 3.51 0.99 0.96 [34] YQ01 石英二长(斑)岩 青尖坡 22.93 37.08 6.05 2.47 0.96 0.97 [35] YQ03 石英二长(斑)岩 羊爪沟 19.07 27.66 6.39 2.06 0.85 1.08 [35] 注：ΣLREE=ΣLREE(La-Eu)，ΣHREE=ΣHREE(Gd-Lu)，—表示未测出。主量元素含量单位为%，稀土元素含量单位为10-6
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③ 山西省地质局区调队.山西省中生代中酸性侵入岩.1982.
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