LA-MC-ICP-MS zircon U-Pb age and geochemical characteristics of the Chengwan granite in Tongbai area, South Qinling
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摘要:
程湾花岗岩位于南秦岭桐柏地区，岩性主要为片麻状（黑云母）正长花岗岩，岩石地球化学成分显示其高硅、富碱、贫镁、低磷和低钛的特征，A/CNK=0.99~1.40，平均为1.17，为高钾钙碱性系列过铝质岩石，稀土元素配分曲线总体表现为右倾斜的"海鸥式"，具有负Eu异常（δEu=0.11~0.81，平均0.46）。岩石富集高场强元素Zr、Th、Hf和Rb、K，强烈亏损Ba、Sr、P、Ti，10000Ga/Al值在2.84~3.63之间，计算锆石饱和温度为817~879℃，属于A2型花岗岩。正长花岗岩LA-MC-ICP-MS锆石U-Pb测年结果表明，其206Pb/238U年龄加权平均值为793.0±4.1Ma，表明岩体形成于新元古代青白口纪晚期，而非前人认为的早古生代，其形成与Rodinia超大陆的裂解有关，且形成于裂解的初期阶段。桐柏地区当时仍为扬子大陆北缘的南秦岭，在新元古代中-晚期（825~611Ma）整体上处于陆内裂解的构造体制。
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关键词:
- 南秦岭 /
- 程湾花岗岩 /
- A2型花岗岩 /
- 新元古代 /
- Rodina超大陆裂解
Abstract:The Chengwan granite is located in Tongbai area, South Qinling. The lithology is mainly granulite (biotite) syenite granite. Lithochemical analysis shows that it has high SiO2, high alkali, poor MgO and low TiO2, and A/CNK=0.99~1.40, with an average of 1.17, thus belonging to the high-K calc-alkaline series. Chondrite-normalized REE patterns of the Chenwang granite are characterized by right-inclined "seagull"with Eu anomalies (δEu=0.11~0.81, 0.46 on average). The rock is characterized by enrichment of HFSE (Zr, Th, Hf), Rb, K, and strong depletion of Ba, Sr, P and Ti. The values of 10000Ga/Al range from 2.84 to 3.63. Zircon saturation temperatures range from 817~879℃. All these features suggest that the Chengwan granite belongs to A2-type granite. LA-MC-ICP-MS U-Pb dating yielded a weighted mean 206Pb/238U age of 793.0±4.1Ma for the zircon from syenogranite, indicating that the Chengwan granite was formed in the late Neoproterozoic Qingbaikouan period rather than previously considered Early Paleozoic. Its formation was related to the breakup of Rodinia supercontinent, and was formed in the early stage of breakup. The South Qinling still belonged to the northern margin of the Yangtze continental margin in Tongbai area, globally belonging to continental cleavage at the middle to late stage of the Neoproterozoic (about 825Ma to 611Ma).
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致谢: 撰写过程中得到中国地质大学(武汉)资源学院付乐兵博士、河南地矿三院杨泽强教授级高工的指点，锆石样品测试得到天津地质矿产研究所实验室王家松同志的帮助，审稿专家提出了宝贵的意见，在此谨致谢意。
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图 1 桐柏地区地质简图(据参考文献②修改)
1—新生界；2—泥盆系南湾组；3—奥陶系二郎坪群；4—早古生代歪头山组；5—震旦系陡山沱组；6—中南华系肖家庙岩组；7—青白口系武当岩群；8—中新元古界龟山岩组；9—中元古界秦岭岩群；10—早白垩世花岗岩；11—北秦岭早志留世花岗岩；12—南秦岭晚古生代花岗岩；13—南秦岭早古生代花岗岩；14—南秦岭青白口纪花岗岩；15—南秦岭中元古代桐柏杂岩；16—早古生代基性-超基性岩；17—断裂及编号：F1—朱阳关-大河断裂；F2—松扒断裂(商南-丹凤断裂)；F3—老湾断裂；F4—桐柏-商城断裂；F5—固庙断裂；F6—新城-黄陂断裂；①—三门峡-鲁山断裂；②—栾川-明港断裂；③—商南-丹凤断裂；④—襄樊-广济断裂；⑤—郯庐断裂；18—锆石U-Pb样品采样位置
Figure 1. Simplified geological map of Tongbai area
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图 2 程湾花岗岩宏观及微观特征
a—程湾花岗岩与肖家庙岩组断层接触；b—程湾花岗岩野外露头；c、d—程湾花岗岩镜下照片(正交偏光)。Kfs—钾长石；Qtz—石英；Pl—斜长石；Bt—黑云母；Ap—磷灰石
Figure 2. Macroscopic and microscopic characteristics of the Chengwan granite
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图 3 程湾花岗岩锆石阴极发光(CL)图像及测点年龄
Figure 3. CL images and dating spots of zircons from the Chengwan granite
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图 4 程湾花岗岩锆石U-Pb谐和图
Figure 4. U-Pb concordia diagram of the zircon from the Chengwan granite
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图 5 程湾花岗岩R1-R2分类图解(底图据参考文献[19])
1—碱性辉长岩；2—橄榄辉长岩；3—辉长苏长岩；4—正长辉长岩；5—二长辉长岩；6—辉长岩；7—正长闪长岩；8—二长岩；9—二长闪长岩；10—闪长岩；11—霞石正长岩；12—正长岩；13—石英正长岩；14—石英二长岩；15—英云闪长岩；16—碱性花岗岩；17—正长花岗岩；18—二长花岗岩；19—花岗闪长岩
Figure 5. R1-R2 diagrams of the Chengwan granite
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图 7 程湾花岗岩球粒陨石标准化稀土元素配分模式图
(标准化值据参考文献[25])
Figure 7. Chondrite-normalized REE patterns of the Chengwan granite
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图 8 程湾花岗岩原始地幔标准化微量元素蛛网图
(标准化值据参考文献[25])
Figure 8. PM-normalized incompatible element spider patterns of the Chengwan granite
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表 1 程湾花岗岩LA-MC-ICP-MS锆石U-Th-Pb同位素测定数据
Table 1 The U-Th-Pb isotope composition of zircons from the Chengwan granite measured by LA-MC-ICP-MS
测点号 Pb U Th/U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 年龄/Ma /10-6 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 13 85 1.08 0.1319 0.001 1.1950 0.030 0.0657 0.002 798 8 798 20 798 49 2 10 65 0.85 0.1316 0.001 1.1948 0.041 0.0658 0.002 797 8 798 27 801 70 3 28 196 0.68 0.1313 0.001 1.1915 0.019 0.0658 0.001 795 8 797 13 800 30 4 32 241 0.54 0.1243 0.001 1.1578 0.019 0.0676 0.001 755 7 781 13 855 33 5 23 165 0.52 0.1306 0.001 1.1892 0.021 0.0661 0.001 791 8 796 14 808 34 6 16 109 0.65 0.1300 0.001 1.1785 0.029 0.0657 0.002 788 8 791 20 798 50 7 11 72 0.75 0.1298 0.001 1.1933 0.029 0.0667 0.002 787 8 797 19 828 48 8 7 46 0.89 0.1334 0.001 1.2067 0.044 0.0656 0.002 807 8 804 29 794 74 9 28 197 0.51 0.1313 0.001 1.1933 0.025 0.0659 0.001 795 8 797 17 804 42 10 15 106 0.64 0.1308 0.001 1.1821 0.027 0.0655 0.001 793 8 792 18 791 46 11 22 144 0.82 0.1316 0.001 1.1930 0.023 0.0658 0.001 797 8 797 15 799 38 12 54 378 0.69 0.1302 0.001 1.1808 0.016 0.0658 0.001 789 8 792 11 799 26 13 22 144 1.22 0.1247 0.001 1.1592 0.026 0.0674 0.001 757 7 782 17 852 44 14 47 398 0.87 0.0970 0.001 0.9539 0.013 0.0713 0.001 597 6 680 9 967 26 15 44 322 0.67 0.1258 0.001 1.1609 0.020 0.0669 0.001 764 7 782 14 835 33 16 22 183 0.60 0.1088 0.001 1.0219 0.020 0.0681 0.001 666 7 715 14 872 38 17 26 216 0.72 0.1043 0.001 0.9915 0.018 0.0690 0.001 640 6 700 13 897 35 18 38 306 0.84 0.1090 0.001 1.0150 0.020 0.0675 0.001 667 6 711 14 855 40 19 37 331 0.73 0.1008 0.001 0.9674 0.015 0.0696 0.001 619 6 687 10 916 28 20 19 149 0.57 0.1149 0.001 1.0682 0.025 0.0674 0.002 701 7 738 17 851 48 21 34 309 0.41 0.1025 0.001 0.9795 0.020 0.0693 0.001 629 6 693 14 908 38 22 27 175 0.94 0.1317 0.001 1.1926 0.020 0.0657 0.001 798 8 797 14 796 33 23 28 184 0.87 0.1304 0.001 1.1965 0.020 0.0665 0.001 790 8 799 14 823 33 24 14 88 1.15 0.1286 0.001 1.1767 0.031 0.0664 0.002 780 8 790 21 818 54 
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表 2 程湾花岗岩主量、微量及稀土元素分析结果
Table 2 Major, trace and rare earth element concentrations of the Chengwan granite
样号 D0556 D0557 D9051 D9027 D9028 ZW-1* 0003/6* 102/1* ZY25* SiO2 75.60 74.78 75.38 77.16 74.48 77.78 76.76 76.09 76.91 TiO2 0.05 0.21 0.23 0.19 0.24 0.20 0.15 0.08 0.13 Al2O3 13.52 13.41 13.16 11.74 13.98 11.37 12.28 12.85 12.16 Fe2O3 0.27 0.18 0.18 1.59 1.28 1.70 1.33 1.61 1.40 FeO 0.58 1.67 1.03 0.48 0.73 0.18 0.26 0.35 0.34 MnO 0.05 0.07 0.02 0.08 0.07 0.02 0.13 0.025 0.05 MgO 0.09 0.35 0.12 0.31 0.33 0.05 0.48 0.13 0.17 CaO 0.69 0.73 0.40 0.85 0.86 0.42 0.11 0.18 0.25 Na2O 4.37 3.00 3.62 3.30 3.20 3.90 2.88 3.71 3.61 K2O 3.69 3.95 4.64 3.59 4.00 4.00 3.54 4.31 4.02 P2O5 0.02 0.05 0.01 0.05 0.09 0.03 0.04 0.145 0.06 H2O+ 0.73 0.79 0.87 1.05 0.65 烧失量 0.59 0.76 0.69 0.55 0.52 0.33 0.84 0.88 0.62 总计 99.66 99.19 99.66 100.40 99.91 99.65 98.8 99.48 99.72 A/CNK 1.09 1.27 1.12 1.08 1.25 0.99 1.40 1.16 1.13 A/NK 1.21 1.46 1.20 1.26 1.46 1.06 1.43 1.19 1.18 ALK 8.06 6.95 8.26 6.89 7.20 7.90 6.42 8.02 7.63 R1 2624 2983 2643 3092 2852 2819 3286 2706 2880 R2 347 364 311 339 386 272 282 279 276 σ 1.99 1.51 2.01 1.39 1.64 1.79 1.22 1.94 1.72 DI 93.82 89.10 94.00 91.25 89.30 95.57 92.31 94.68 94.61 Mg# 16.32 25.41 15.22 22.44 23.83 4.96 37.02 11.42 15.94 TZr/℃ 732.50 844.50 837.54 823.75 864.72 817.52 829.51 879.46 843.85 Rb 205 176 164 137 184 89 90 115 98 Ba 484 678 694 500 597 500 200 600 433 Th 14.38 17.6 11.1 18.7 13.9 5.9 8.5 5.2 6.5 U 1.17 1.12 0.79 3.04 1.33 Nb 13.0 18.2 17.6 26.1 22.9 10.3 22.6 14.1 15.7 Ta 1.09 0.89 1.43 1.33 1.49 1.29 1.89 0.99 1.39 Sr 124.0 83.1 82.7 99.0 105 94 58 88 80 Zr 47.6 158 157 137 196 135 127 234 165 Hf 2.93 6.86 8.62 7.83 11.70 5.00 4.70 7.40 5.70 Ga 26.0 22.5 19.8 21.8 25.9 La 22.35 30.26 34.91 27.60 41.70 27.50 14.05 22.93 20.09 Ce 46.44 85.74 48.16 52.00 74.90 59.04 36.22 80.96 53.42 Pr 5.30 7.01 6.78 5.74 9.64 6.05 3.72 5.09 4.83 Nd 18.59 24.00 23.15 20.00 33.80 18.48 14.89 17.67 15.98 Sm 3.02 4.08 4.11 3.55 6.69 3.68 3.63 3.90 3.53 Eu 0.78 0.79 0.70 0.68 0.94 0.40 0.14 0.56 0.32 Gd 2.72 4.01 3.99 3.34 6.19 3.28 3.82 3.38 3.35 Tb 0.35 0.49 0.71 0.51 1.05 0.58 0.85 0.71 0.65 Dy 1.87 2.38 4.46 2.89 6.23 3.53 6.01 4.72 4.37 Ho 0.42 0.47 0.98 0.61 1.24 0.71 1.34 1.01 0.94 Er 1.51 1.38 3.15 1.89 3.88 2.20 4.39 3.36 3.04 Tm 0.34 0.23 0.59 0.34 0.68 0.37 0.77 0.55 0.57 Yb 2.98 1.57 4.09 2.43 4.67 2.42 5.36 3.85 4.09 Lu 0.58 0.25 0.66 0.43 0.74 0.36 0.81 0.57 0.54 Y 14.83 12.73 27.57 17.10 34.60 19.67 36.4 27.79 30.48 ∑REE 122.06 175.39 164.01 139.11 226.95 148.27 132.40 177.05 146.19 LREE 96.48 151.88 117.81 109.57 167.67 115.15 72.65 131.11 115.71 HREE 10.75 10.78 18.63 12.44 24.68 13.45 23.35 18.15 17.55 LREE/HREE 8.97 14.09 6.32 8.81 6.79 8.56 3.11 7.22 6.59 (La/Yb)N 5.38 13.83 6.12 8.15 6.41 8.15 1.88 4.27 3.52 (La/Sm)N 4.77 4.79 5.48 5.02 4.02 4.82 2.50 3.80 3.68 (Gd/Yb)N 0.75 2.11 0.81 1.13 1.09 1.12 0.59 0.72 0.68 δEu 0.81 0.59 0.52 0.59 0.44 0.35 0.11 0.46 0.28 δCe 1.01 1.39 0.72 0.96 0.88 1.07 1.20 1.76 1.29 注：*数据据参考文献②；主量元素含量单位为%，微量和稀土元素为10-6
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