Zircon U-Pb chronology and geochemical characteristics of Late Si-lurian monzogranite in Ongniud Bannar, Inner Mongolia
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摘要:
内蒙古翁牛特旗小营子地区铅锌矿周围分布有大面积花岗岩，野外地质调查及室内鉴定为二长花岗岩。通过LA-ICPMS锆石U-Pb同位素测试，确定其形成时代为419.3±9.2Ma，属于晚志留世。二长花岗岩中SiO2含量为74.41%~75.05%，K2O含量为3.05%~4.42%，K2O/Na2O值介于0.70~1.11之间，Al2O3含量为13.22%~14.02%，铝饱和指数（A/CNK）为0.99~1.1，Fe、Mg、Ti氧化物含量较低，这些特征显示二长花岗岩为富硅、略富铝、中高钾钙碱性I型花岗岩。轻、重稀土元素比值（LREE/HREE）在10.61~16.61之间，（La/Yb）N值在12.52~27.44之间，轻、重稀土元素分馏明显，δEu值为0.48~0.81，显示中等负Eu异常。富集大离子亲石元素Rb、Ba、U、K，相对亏损高场强元素Nb、Zr、Hf，具有低的Sr、Yb含量。地球化学特征显示，二长花岗岩形成于活动大陆边缘火山弧。结合区域地质资料推断，小营子二长花岗岩是在古亚洲洋向华北板块俯冲背景下白乃庙岛弧消亡过程中形成的。
Abstract:The granite widely distributed in the Xiaoyingzi lead-zinc ore deposit of Ongniud Bannar, Inner Mongolia, consists of monzogranite as revealed by field geological survey and thin section identification. Zircon LA-ICP-MS U-Pb dating result shows that the monzogranite was formed in late Silurian (419.3±9.2Ma) rather than in Mesozoic as previously held. The values of SiO2, K2O, K2O/Na2O, Al2O3 are 74.41%~75.05%, 3.05%~4.42%, 0.70~1.11, 13.22%~14.02% respectively, the aluminum saturation index-es (A/CNK) range from 0.99 to 1.1, and the oxides of Fe, Mg, Ti are relatively low, which implies that the monzogranite is Ⅰ-type granite. The ratios of light and heavy rare elements (LREE/HREE) are between 10.61 and 16.61, and the (La/Yb)N ratios are be-tween 12.52 and 27.44, suggesting obvious fractionation between light and heavy rare elements. The values of δEu are 0.48~0.81 with moderate negative europium anomaly. It is enriched in large ion lithophile elements (LILEs) Rb, Ba, U, K, depleted relatively in high field strength elements (HFSEs) Nb, Zr, Hf, and depleted relatively in Sr, Yb. All these geochemical characteristics show that the monzogranite is a product of volcanic arc on an active continental margin. The regional geological data reveal that the monzogranite was formed in the process of extinction of Bainaimiao island arc in the setting of subduction of the Paleo Asian Ocean to the North China craton.
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Keywords:
- Ongniud Bannar /
- monzogranite /
- zircon U-Pb dating /
- geochemical /
- Bainaimiao island arc
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图 1 小营子地区地质简图①
1—第四系；2—下白垩统白音高老组；3—下二叠统于家北沟组；4—古元古界宝音图群；5—二长花岗岩；6—断裂；7—性质不明断裂；8—地质界线；9—混染带；10—产状；11—小营子铅锌矿点；12—采样位置及编号
Figure 1. Simplified geological map of Xiaoyingzi area
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图 2 小营子铅锌矿二长花岗岩与宝音图群关系及野外特征
Q—石英；Kfs—钾长石；Pl—斜长石
Figure 2. Contact relation of Baointu Group and monzogranite in Xiaoyingzi
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图 3 小营子二长花岗岩锆石典型阴极发光（CL）图像
Figure 3. Zircon CL microscopic images of monzogranite in Xiaoyingzi
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图 4 小营子二长花岗岩样品锆石U-Pb谐和图
Figure 4. Zircon U-Pb concordia diagrams of monzogranite in Xiaoyingzi
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图 5 小营子二长花岗岩岩体SiO2-(Na2O+K2O)（a）及A/CNK-A/NK（b）图解
Figure 5. SiO2-(Na2O+K2O) (a) and A/CNK-A/NK (b) patterns of monzogranite in Xiaoyingzi
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图 6 小营子二长花岗岩稀土元素配分曲线（a）和微量元素蛛网图（b）
Figure 6. Chondrite-normalized REE patterns (a) and primitive mantle-normalizedtrace elements spidergrams (b) of monzogranite in Xiaoyingzi
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图 7 小营子二长花岗岩Y-Nb和(Y+Nb)-Rb图解
VAG—火山弧环境；WPG—板内环境；syn-COLG—同碰撞环境；ORG—造山带环境
Figure 7. Y-N and (Y+Nb)-Rb patterns of monzogranite in Xiaoyingzi
表 1 二长花岗岩LA-ICP-MS锆石U-Th-Pb分析结果
Table 1 LA-ICP-MS zircon U-Th-Pb data of monzogranite
样品号及分析点号 Pb Th U Th/U 同位素比值 同位素年龄/Ma 10-6 207Pb/206Pb±1σ 207Pb/235U±1σ 206Pb/238U±1σ 207Pb/206Pb±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 14CH30-01 173 1056 1956 0.54 0.14460 0.01229 10.2871 0.85788 0.48752 0.01758 2559 76 2460 77 2283 152 14CH30-02 181 1101 1488 0.74 0.03957 0.00324 0.39171 0.03175 0.06895 0.00214 213 18 335.6 23 429 13 14CH30-03 351 2019 3013 0.67 0.16465 0.01117 6.87994 0.39444 0.29421 0.00853 2505 115 2096 51 1662 42 14CH30-04 235 1887 4602 0.41 0.15663 0.00578 10.5675 0.37767 0.47361 0.00742 2499 32 2485 33 2419 63 14CH30-05 166 1412 1358 1.04 0.05568 0.00251 0.53737 0.02330 0.06877 0.00102 438 128 436 15 428 6 14CH30-06 255 2101 3136 0.67 0.05341 0.00247 0.68635 0.03205 0.09230 0.00154 346 108 530 19 569 9 14CH30-07 187 1105 961 1.15 0.05733 0.00281 0.52334 0.02523 0.06595 0.00094 505 109 427 17 411 6 14CH30-08 691 2591 3926 0.66 0.16666 0.00308 9.45355 0.22848 0.40555 0.00718 2524 30 2383 22 2194 33 14CH30-09 158 982 2395 0.41 0.14367 0.00411 4.58271 0.12798 0.22926 0.00264 2271 49 1746 23 1330 14 14CH30-10 206 1762 2002 0.88 0.05916 0.00274 0.56146 0.02434 0.06881 0.00089 572 97 452 16 429 5 14CH30-11 144 887 1887 0.47 0.15679 0.00331 6.86632 0.19417 0.31330 0.00586 2421 36 2094 25 1756 29 14CH30-12* 361 2418 3900 0.62 0.08106 0.00434 0.81945 0.04324 0.07494 0.00152 1233 105 60 24 465 9 14CH30-13 140 801 1097 0.73 0.06164 0.00338 0.58333 0.03093 0.06976 0.00116 661 119 466 20 434 7 14CH30-14 396 2108 3634 0.58 0.05982 0.00274 0.55147 0.02559 0.06658 0.00102 598 100 446 17 415 6 14CH30-15 167 792 1320 0.6 0.16385 0.00337 8.42091 0.19182 0.36942 0.00450 2496 35 2277 21 2026 21 14CH30-16* 144 834 1158 0.72 0.12388 0.00742 1.31504 0.08581 0.07435 0.00155 2012 107 852 38 462 9 14CH30-17 229 1205 1401 0.86 0.07625 0.00594 0.64654 0.04043 0.06454 0.00125 1101 156 506 25 403 8 14CH30-18 133 699 813 0.86 0.05179 0.00269 0.47013 0.02410 0.06563 0.00086 276 119 391 17 409 5 14CH30-19* 351 1496 3053 0.49 0.06617 0.00430 0.65080 0.03810 0.07325 0.00150 813 105 509 23 455 9 14CH30-20 117 1076 2339 0.46 0.16254 0.00304 10.7902 0.21727 0.47554 0.00577 2507 25 2505 19 2483 31 注：测试单位为中国地质大学（北京）科学研究院地质过程与矿产资源国家重点实验室。*代表调谐度太低加权平均未计算点 
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表 2 二长花岗岩岩体主量、微量及稀土元素分析结果
Table 2 Major, trace and rare earth elements compositions of monzogranite
样品原号
岩性14CH28
二长花岗岩14CH30
二长花岗岩14CH31
二长花岗岩14CH32
二长花岗岩14CH33
二长花岗岩SiO2 74.62 75.1 74.8 74.8 74.4 TiO2 0.12 0.13 0.10 0.11 0.10 Al2O3 14.0 13.2 13.8 13.5 13.9 Fe2O3* 0.11 0.18 0.10 0.16 0.16 FeO 0.87 1.22 0.83 0.98 0.69 MnO 0.04 0.03 0.03 0.07 0.04 MgO 0.23 0.41 0.24 0.26 0.26 CaO 0.75 1.57 1.05 2.03 1.38 Na2O 3.95 4.33 3.86 3.76 4.09 K2O 4.42 3.05 4.39 3.60 4.20 P2O5 0.03 0.04 0.03 0.03 0.03 烧失量 0.84 0.78 0.67 0.70 0.76 总计 100 100 99.9 99.9 99.9 A/CNK 1.11 1.00 1.06 0.98 1.01 A/NK 1.24 1.27 1.25 1.34 1.23 分异指数(DI) 92.6 88.8 91.7 87.6 90.9 La 15.8 15.5 14.4 13.8 12.8 Ce 29.0 29.5 26.9 26.5 23.4 Pr 3.25 3.21 2.97 2.88 2.68 Nd 11.3 11.6 10.5 10.8 9.34 Sm 1.96 2.11 1.68 1.87 1.51 Eu 0.41 0.32 0.42 0.50 0.37 Gd 1.56 1.88 1.40 1.59 1.37 Tb 0.18 0.28 0.18 0.20 0.18 Dy 0.87 1.45 0.75 0.92 0.77 Ho 0.16 0.31 0.14 0.17 0.14 Er 0.40 0.79 0.38 0.47 0.37 Tm 0.06 0.13 0.07 0.08 0.07 Yb 0.41 0.89 0.48 0.52 0.39 Lu 0.07 0.14 0.08 0.09 0.07 ΣREE 65.4 68.1 60.3 60.4 53.5 LREE 61.7 62.2 56.9 56.4 50.1 HREE 3.72 5.87 3.47 4.04 3.35 LREE/HREE 16.6 10.6 16.4 13.9 14.9 (La/Yb)N 27.4 12.5 21.7 19.0 23.4 δEu 0.70 0.48 0.81 0.86 0.77 δCe 0.94 0.97 0.96 0.98 0.93 Li 5.28 9.15 5.80 4.71 4.63 Be 1.05 0.99 0.89 0.78 0.76 Sc 1.49 2.16 1.16 1.61 1.40 V 5.11 15.7 4.04 4.77 5.41 Cr 1.55 7.53 4.08 5.66 3.37 Co 0.60 1.63 0.82 0.71 1.21 Ni 2.28 3.62 3.43 2.34 2.15 Cu 4.18 20.1 11.5 4.27 6.49 Zn 135 181 155 93.1 111 Ga 14.0 12.5 12.2 13.1 13.9 Rb 102 66.6 82.4 78.0 91.7 Sr 238 359 227 253 241 Y 3.96 7.69 3.86 4.76 4.07 Mo 0.24 0.69 0.44 0.47 0.22 Cd 0.30 0.19 0.34 0.23 0.22 In 0.02 0.02 0.01 0.01 0.01 Sb 0.32 0.74 0.44 1.12 0.57 Cs 1.46 0.87 1.03 1.11 0.93 Ba 796 1250 586 567 720 W 0.22 0.16 0.19 0.26 0.47 Re 0.01 0.01 ＜0.002 0.01 0.01 Tl 0.55 0.54 0.52 0.64 0.54 Pb 106 69.5 71.1 36.4 38.8 Bi 0.02 0.02 0.01 0.01 0.04 Th 8.02 9.01 7.83 8.06 6.06 U 1.58 1.66 1.32 1.33 0.82 Nb 6.28 11.6 4.22 6.00 5.35 Ta 0.39 0.80 0.28 0.35 0.37 Zr 75.9 65.1 73.1 77.6 57.1 Hf 2.49 2.42 2.35 2.48 1.76 注：测试单位为中国地质大学（北京）科学研究院地质过程与矿产资源国家重点实验室。*代表调谐度太低加权平均未计算点
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