LA-ICP-MS zircon U-Pb geochronology of the Huyanshan alkaline intrusive complex in the Lüliang Mountain of North China Craton and its geological significance
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摘要:
为获取狐偃山碱性岩浆活动的时限，对狐偃山碱性杂岩体早晚2 期侵入体进行LA-ICP-MS 锆石U-Pb 测年。结果显示，早期侵入体二长岩的206Pb/238U 年龄加权平均值为127±1Ma（MSWD=3.7），属于早白垩世早期；晚期侵入体正长岩的206Pb/238U 年龄加权平均值为114±4Ma（MSWD=3.5），属于早白垩世晚期。二长岩岩浆活动对应于华北克拉通中部碱性岩浆活动的高峰期（约130Ma），正长岩则代表华北克拉通中部最后一期碱性岩浆活动的时间（约114Ma）；华北中部碱性岩浆活动与东部发生的强烈岩浆活动的时间一致，对应于华北克拉通岩石圈减薄的峰期。捕获岩浆成因锆石2.5~2.4Ga 的年龄，对应华北克拉通化的时期；2.2~2.1Ga 的继承锆石年龄，代表华北在2.5Ga 左右克拉通化之后于2.3~2.0Ga 经历的一次陆内拉伸-裂谷-岩浆事件；约1.8Ga 继承锆石的年龄，是华北克拉通发生在陆内裂谷背景下的大规模岩浆作用的表现；232~220Ma 的继承锆石年龄，代表晚三叠世华北克拉通发生的一期岩浆-构造热事件的时间。
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关键词:
- 碱性杂岩体 /
- LA-ICP-MS 锆石U-Pb 测年 /
- 早白垩世 /
- 华北克拉通
Abstract:In order to constrain the age of alkaline magmatism, the authors determined U-Pb zircon ages by the high accuracy LAICP-MS method for the early and late stage of Huyanshan alkaline intursive complex. Zircons from monzonite yielded a weighted mean 206Pb/238U age of 127±1Ma, indicating that the monzonite occurred at the early stage of the Early Cretaceous, corresponding to the peak time of alkaline magmatism in central North China Craton. Zircons from syenite have a weighted mean 206Pb/238U age of 114±4 Ma, suggesting that the syenite was formed at the late stage of the Early Cretaceous, representing the last alkaline magma activity in central North China Craton. The time of alkaline magmatism was consistent with the magmatism in east of North China Craton, which was the peak period of lithospheric thinning of North China Craton. In addition, the inherited zircons have ages of 2.5~ 2.4Ga and 2.2~2.1Ga, respectively, corresponding to the cratonization stage of North China Craton and the intracontinental extension-rifting event in 2.3~2.0Ga. The age of ~1.8Ga for inherited zircons resulted from intracontinental rifting and mass magmatism in the North China Craton. The ages of 232~220Ma were given by inherited zircons, representing magmatic-tectothermal event of North China Craton in Late Triassic.
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致谢: 感谢中国冶金地质总局山东局测试中心在样品测试分析过程中给予的热心帮助，特别感谢审稿专家提出的宝贵修改意见。
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图 1 山西碱性岩及狐偃山碱性杂岩体地质简图
Pre∈ —前寒武系；∈ —寒武系；O—奥陶系；C—石炭系；P—二叠系；T—三叠系；Q—第四系
Figure 1. Sketch geological map of Huyanshan alkaline complex and alkaline rocks in Shanxi
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图版1 a.二长岩宏观照片；b、c.二长岩镜下照片，b（-），c（+）；d.正长岩宏观照片；e、f.正长岩镜下照片，e（-），（f +）.Or—碱性长石；Pl—斜长石；Mt—磁铁矿；Agt—霓辉石
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图 2 二长岩（a）和正长岩（b）锆石阴极发光（CL）图像
Figure 2. CL images of zircons from monzonite (a) and syenite (b)
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图 3 二长岩锆石U-Pb 年龄谐和图
Figure 3. Zircon U-Pb concordia and weighted mean ages of monzonite
表 1 狐偃山二长岩、正长岩LA-ICP-MS 锆石U-Th-Pb 定年结果
Table 1 LA-ICP-MS zircon U-Th-Pb data for monzonite and syenite from Huyanshan
测点号 Th U Th/U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 同位素年龄/Ma /10-6 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 二 长 岩 GS01-1 2290 2547 0.90 0.0494 0.0011 0.137 0.004 0.0199 0.0002 169 50 131 3 127 1 GS01-2 2421 2568 0.94 0.0576 0.0014 0.163 0.004 0.0202 0.0002 517 52 153 3 129 1 GS01-3 1480 1663 0.89 0.0557 0.0017 0.149 0.005 0.0192 0.0003 443 67 141 4 123 2 GS01-4 1343 1607 0.84 0.0556 0.0016 0.157 0.005 0.0203 0.0002 435 63 148 4 130 1 GS01-5 2331 2236 1.04 0.0581 0.0014 0.161 0.004 0.0198 0.0002 600 52 151 4 127 1 GS01-6 1994 1912 1.04 0.0540 0.0014 0.148 0.004 0.0198 0.0002 369 62 140 3 126 1 GS01-7 2578 2334 1.11 0.0464 0.0011 0.128 0.003 0.0200 0.0002 17 61 123 3 127 1 GS01-8 2084 1683 1.24 0.0515 0.0014 0.146 0.004 0.0205 0.0003 265 65 138 4 131 2 GS01-9 2329 2145 1.09 0.0540 0.0013 0.152 0.004 0.0203 0.0002 372 58 144 3 129 2 GS01-10 2828 2297 1.23 0.0560 0.0021 0.151 0.007 0.0192 0.0003 454 81 142 6 122 2 GS01-11 2308 1916 1.20 0.0604 0.0022 0.172 0.007 0.0205 0.0003 617 78 162 6 130 2 GS01-12 1944 2398 0.81 0.0484 0.0010 0.142 0.003 0.0212 0.0002 117 50 134 3 135 1 GS01-13 11824 7030 1.68 0.0518 0.0011 0.155 0.003 0.0215 0.0003 276 44 146 3 137 2 GS01-14 2368 2090 1.13 0.0541 0.0014 0.158 0.004 0.0210 0.0002 376 56 149 4 134 1 GS01-15 2368 2189 1.08 0.0498 0.0010 0.138 0.003 0.0200 0.0002 187 18 131 3 127 1 GS01-16 84 138 0.61 0.1085 0.0025 4.585 0.130 0.3047 0.0055 1774 42 1747 24 1715 27 GS01-17 205 219 0.93 0.1324 0.0025 6.892 0.137 0.3757 0.0042 2129 32 2098 18 2056 20 GS01-18 247 483 0.51 0.1355 0.0022 7.270 0.129 0.3866 0.0039 2172 28 2145 16 2107 18 GS01-19 291 424 0.69 0.1364 0.0020 7.388 0.135 0.3898 0.0049 2183 27 2160 16 2122 23 GS01-20 2722 2452 1.11 0.0503 0.0010 0.142 0.003 0.0204 0.0002 209 46 135 3 130 1 GS01-21 3937 3090 1.27 0.0543 0.0012 0.152 0.004 0.0201 0.0002 389 48 143 3 128 1 GS01-22 1526 1510 1.01 0.0562 0.0013 0.160 0.004 0.0206 0.0003 461 58 151 3 131 2 GS01-23 103 66 1.55 0.1368 0.0030 6.841 0.167 0.3615 0.0055 2187 39 2091 22 1989 26 GS01-24 2168 2194 0.99 0.0522 0.0011 0.149 0.003 0.0205 0.0002 295 45 141 3 131 1 正 长 岩 KT01-1 99 143 0.69 0.0630 0.0055 0.402 0.035 0.0461 0.0014 709 187 343 26 291 8 KT01-3 87 114 0.76 0.0583 0.0058 0.129 0.011 0.0169 0.0006 543 220 123 10 108 4 KT01-4 1216 1260 0.97 0.0616 0.0032 0.143 0.010 0.0166 0.0005 661 111 136 9 106 3 KT01-5 78 270 0.29 0.1102 0.0022 4.513 0.093 0.2940 0.0034 1802 36 1733 17 1662 17 KT01-6 217 482 0.45 0.0593 0.0023 0.287 0.011 0.0348 0.0006 589 83 256 9 221 4 KT01-8 2140 2192 0.98 0.0553 0.0019 0.140 0.005 0.0182 0.0003 433 76 133 4 116 2 KT01-9 335 714 0.47 0.0646 0.0017 0.603 0.016 0.0669 0.0008 761 56 479 10 417 5 KT01-10 854 875 0.98 0.1505 0.0036 7.327 0.170 0.3502 0.0047 2352 41 2152 21 1935 22 KT01-11 1132 1104 1.03 0.0503 0.0025 0.121 0.006 0.0174 0.0003 209 115 116 5 111 2 KT01-12 129 194 0.66 0.1699 0.0051 8.878 0.334 0.3725 0.0065 2556 50 2326 34 2041 30 KT01-13 314 469 0.67 0.0617 0.0021 0.312 0.010 0.0367 0.0011 665 77 275 8 232 7 KT01-14 114 679 0.17 0.0813 0.0022 1.533 0.045 0.1350 0.0017 1229 54 944 18 817 9 KT01-15 565 1054 0.54 0.0852 0.0135 0.224 0.028 0.0191 0.0006 1320 305 205 23 122 4 KT01-16 1342 1305 1.03 0.0527 0.0025 0.136 0.006 0.0186 0.0003 317 107 129 5 119 2 KT01-17 2435 2006 1.21 0.0523 0.0022 0.132 0.006 0.0181 0.0003 298 90 126 5 115 2 KT01-18 133 313 0.42 0.1373 0.0028 6.318 0.142 0.3305 0.0057 2194 31 2021 20 1841 28 
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