Zircon U-Pb dating of Bolongke A-type granite on the margin of northern North China Plate and its geological significance
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摘要:
内蒙古翁牛特旗勃隆克岩体位于华北板块北缘，侵位于上侏罗系火山岩地层中。详细的岩相学研究显示，勃隆克花岗岩具有粒状结构、蠕虫结构和文像结构，块状构造，部分斜长石已绢云母化、泥化。对勃隆克花岗岩进行了LA-ICP-MS锆石U-Pb定年，获得134.0±1.8Ma和134.9±4.1Ma的侵位年龄，表明其形成于早白垩世。地球化学特征显示，花岗岩属于高钾钙碱性系列，有较高的SO2（74.1%~75.6%）、Na2O+K2O（8.98%~9.2%）、Rb（210×10-6~225×10-6）含量和10000×Ga/Al（2.69~2.80）、Rb/Sr（5.8~18.9）值，具有较低的CaO、MgO、Ba和Sr含量。铝饱和指数A/CNK=0.99~1.03，属于偏铝质或过铝质A型花岗岩。稀土元素球粒陨石标准化图解显示，轻稀土元素相对富集，负Eu异常明显；在原始地幔标准化图解上，Ba、Sr、Nb、Ta、P、T强烈亏损，富集Rb、Th、K、Hf等元素，与华北板块北缘早白垩世A型花岗岩类似。结合区域构造演化，认为勃隆克花岗岩形成于伸展构造背景。晚中生代，华北板块北缘构造体制经历了重大的转变，地壳从挤压体制转为岩石圈减薄和地壳伸展体制，软流圈物质上涌导致上覆地壳长英质物质的部分熔融形成勃隆克A型花岗岩。
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关键词:
- A型花岗岩 /
- 早白垩世 /
- LA-ICP-MS锆石U-Pb年龄 /
- 华北板块北缘
Abstract:Bolongke granite, emplaced in the Upper Jurassic volcanic strata, is located on the north margin of the North China Craton (NCC).Detailed petrographical observation reveals that the granite occurs in the forms of euhedral and subeuhedral crystals and exhibits mymekitic and pegmatitic texture and massive structure.Sencitization and argillation exist in part of plagioclases caused by weathering. The LA-ICP-MS analysis of zircons yielded empkcement ages of 134.0±1.8Ma(MSWD=1.8) and 134.9±4.1Ma(MSWD=2.0), indicating that the Bolongke granite was fomied in the Early Cretaceous.A geochemical study of the intrusion suggests that it belongs to high-K calc-alkaline series and is characterized by depletion of Ba, Sr and enrichment of such elements as Rb, Th, Pb and Hf, with obviously negative Eu anomalies. To sum up, the intrusion shows the charactejstics of A-type granite. Tectonic discrimination diagrams indicate that Bolongke granite was fomed in an anorogenic extension environment. Combined with the achievements obtained by previous researchers, the authors tentatively hold that the emplacement of Bolongke granite belonged to the Mesozoic magmatic events in the North China Craton and was produced by lithospheric thinning.
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致谢: 感谢审稿专家给出的建设性修改意见。
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图 1 内蒙古翁牛特旗勃隆克地区区域地质简图(据参考文献①修改)
Figure 1. Simplified geological map of Bolongke area in Onguid Banner, Inner Mongolia
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图 2 翁牛特勃隆克花岗岩显微结构照片(正交偏光)
Qtz—石英；Pl—斜长石；Kfs—钾长石；Ser—绢云母
Figure 2. Photomicrograph showing textural relationships of granite from Bolongke, Inner Mongolia
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图 3 内蒙古翁牛特勃隆克花岗岩代表性锆石阴极发光(CL)图像及U-Pb年龄谐和图
Figure 3. Cathodoluminescence images and concordia diagrams of U-Pb zircon dating results of granite in Bolongke, Inner Mongolia
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图 5 勃隆克花岗岩A/CNK-A/NK图解(a)和SiO2-K2O图解(b)[40]
Figure 5. Diagrams of A/CNK-A/NK(a)and SiO2-K2O(b)for granite
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表 1 翁牛特勃隆克花岗岩LA-ICP-MS锆石U-Th-Pb年龄测定结果
Table 1 LA-ICP-MS zircon U-Th-Pb data for Bolongke granite
点号 Th/10-6 U/10-6 Th/U 同位素比值 年龄/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 206Pb/238U 1σ Sample-1(119°02′40.5″E、43°07′31.2″N) 1 113 242 0.5 0.1158 0.0016 0.5394 0.1042 0.3465 0.0040 1918 19 2 130 114 1.1 0.0491 0.0020 0.1425 0.0062 0.0209 0.0003 133 2 3 218 141 1.6 0.0491 0.0025 0.1419 0.0075 0.0209 0.0003 134 2 4 156 127 1.2 0.0488 0.0045 0.1420 0.0136 0.0212 0.0004 135 3 5 170 169 1 0.0567 0.0042 0.1591 0.0116 0.0204 0.0003 130 2 6 263 118 2.2 0.0483 0.0027 0.1453 0.0085 0.0218 0.0004 139 2 7 42 96 0.4 0.1627 0.0024 0.1015 0.2172 0.4466 0.0052 2380 23 8 277 465 0.6 0.1660 0.0024 0.9904 0.1916 0.4483 0.0052 2388 23 9 269 227 1.2 0.0808 0.0025 0.2430 0.0083 0.0214 0.0003 136 2 10 77 203 0.4 0.1693 0.0025 0.1051 0.2178 0.4475 0.0052 2384 23 11 1251 1155 1.1 0.0552 0.0011 0.1522 0.0037 0.0210 0.0003 134 2 12 552 375 1.5 0.0615 0.0015 0.1769 0.0048 0.0213 0.0003 136 2 13 102 97 1.1 0.0489 0.0028 0.1479 0.0088 0.0213 0.0003 136 2 14 193 182 1.1 0.0534 0.0035 0.1545 0.0099 0.0210 0.0003 134 2 15 356 256 1.4 0.0839 0.0092 0.2346 0.0252 0.0203 0.0005 129 3 16 76 168 0.5 0.1818 0.0047 0.1157 0.2681 0.4615 0.0055 2446 24 17 269 222 1.2 0.0537 0.0035 0.1548 0.0098 0.0209 0.0003 133 2 18 230 141 1.6 0.0660 0.0030 0.1961 0.0095 0.0214 0.0003 136 2 19 178 143 1.3 0.0574 0.0074 0.1575 0.0200 0.0199 0.0004 127 3 20 1017 385 2.6 0.1639 0.0034 0.4727 0.0119 0.0219 0.0003 140 2 Sample-5(119°01′49.01″E、43°07′30.2″N) 1 67 47 1.4 0.0486 0.0064 0.1504 0.0206 0.0217 0.0006 138 5 2 119 143 0.8 0.0492 0.0031 0.1429 0.0088 0.0211 0.0003 134 4 3 244 457 0.5 0.0741 0.0036 0.2086 0.0109 0.0214 0.0004 137 2 4 260 197 1.3 0.0667 0.0212 0.2371 0.0752 0.0258 0.0006 164 4 5 129 145 0.9 0.0491 0.0053 0.1414 0.0157 0.0210 0.0005 134 4 6 537 285 1.9 0.0495 0.0014 0.1380 0.0043 0.0207 0.0003 132 2 7 477 259 1.8 0.1676 0.0051 0.4671 0.0163 0.0211 0.0003 135 2 8 220 146 1.5 0.0709 0.0092 0.1802 0.0231 0.0184 0.0004 118 2 9 246 194 1.3 0.0711 0.0021 0.2116 0.0068 0.0213 0.0003 136 2 10 331 412 0.8 0.0614 0.0011 0.3313 0.0076 0.0402 0.0005 254 3 11 350 219 1.6 0.1072 0.0076 0.2806 0.0193 0.0190 0.0003 121 2 12 227 165 1.4 0.0813 0.0072 0.2326 0.0219 0.0215 0.0006 137 4 13 188 167 1.1 0.0486 0.0020 0.1453 0.0064 0.0210 0.0003 134 2 14 436 254 1.7 0.1283 0.0071 0.3530 0.0187 0.0199 0.0003 127 2 15 527 341 1.5 0.1237 0.0086 0.3108 0.0211 0.0182 0.0003 116 2 16 371 241 1.5 0.0492 0.0029 0.1541 0.0095 0.0224 0.0004 143 3 17 616 294 2.1 0.0794 0.0047 0.2285 0.0145 0.0211 0.0004 134 3 18 361 213 1.7 0.1280 0.0034 0.4084 0.0128 0.0228 0.0003 145 2 
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表 2 勃隆克花岗岩主量、微量和稀土元素分析结果
Table 2 Whole-rock major, trace and rare earth elements compositions of the Bolongke, InnerMongolia
Samples Sample-1 Sample-2 Sample-3 Sample-4 Sample-5 SiO2 75.6 74.1 74.4 74.8 74.7 Al2O3 12.3 12.7 12.9 12.8 12.9 Fe2O3 1.06 1.1 1.08 1 1.03 FeO 0.15 0.15 0.2 0.15 0.15 MgO 0.34 0.34 0.37 0.4 0.52 CaO 0.33 0.3 0.41 0.39 0.52 Na2O 3.73 3.69 3.75 3.88 3.84 K2O 5.27 5.29 5.28 5.32 5.36 MnO 0.02 0.08 0.08 0.03 0.03 TiO2 0.18 0.2 0.21 0.2 0.2 P2O5 0.07 0.03 0.03 0.03 0.03 烧失量 1.02 2.04 1.35 0.99 0.72 总计 99.87 99.86 99.84 99.86 99.86 TFeO 1.10 1.14 1.17 1.05 1.08 A/CNK 0.99 1.03 1.02 1.00 0.99 K2O/Na2O 1.41 1.43 1.41 1.37 1.4 Ga 18 18.1 18.7 18.3 19.2 Rb 222 210 220 217 225 Sr 38.6 17.1 12.4 11.5 12 Y 19.1 21.2 23 23.6 24.1 Nb 22.3 23.2 24.4 25.6 26.8 Mo 1.33 1.31 2.05 1.09 1.15 Cs 4.35 5.13 6.93 4.97 5.08 Ba 78.2 95 68 46.9 48.2 La 47.6 31.7 49.1 33.4 35.1 Ce 78.9 101 96.9 77.3 79.1 Pr 7.69 5.62 8.59 6.27 6.65 Nd 23.4 18.7 26.5 19.4 21.5 Sm 3.3 2.7 4 2.9 3.2 Eu 0.3 0.3 0.3 0.2 0.3 Gd 2.89 2.61 3.35 2.57 2.76 Tb 0.5 0.5 0.6 0.5 0.6 Dy 2.85 3.17 3.71 3.54 3.46 Ho 0.62 0.71 0.74 0.72 0.78 Er 2.22 2.64 2.61 2.64 2.78 Tm 0.41 0.49 0.48 0.5 0.53 Yb 2.99 3.66 3.39 3.79 3.87 Lu 0.52 0.56 0.58 0.64 0.64 Ta 1.51 1.68 1.74 1.89 1.88 Pb 32 30.4 44.6 32.4 33.3 Th 27.1 26.2 27.1 27.9 28.5 U 2.99 2.46 4.9 2.55 2.68 Zr 209 251 239 266 267 Hf 8.31 9.64 9.51 9.84 9.74 ∑REE 173.77 174.6 201.42 154.01 161.76 δEu 0.3 0.3 0.3 0.3 0.3 (La/Yb)N 10.7 5.84 9.76 5.94 6.11 TZr/℃ 809 829 823 830 829 注：主量元素含量单位为%，微量和稀土元素含量单位为10-6
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