Geochemical characteristics of Early Cretaceous gabbro in Muzidian area, North Dabie and its indicative significance for tectonic environment
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摘要:
为揭示大别造山带基性岩的成因及构造背景，应用LA−ICP−MS锆石定年和地球化学分析，探讨了北大别木子店地区雷家湾辉长岩的成岩年龄、地球化学特征，并通过与安徽段基性—超基性岩对比，揭示了大别造山带基性—超基性岩成因和构造环境。结果显示，北大别木子店地区雷家湾辉长岩成岩年龄为122.3±1.0 Ma。雷家湾辉长岩的SiO2含量介于45.00%~50.69%之间，平均值为48.02%；Mg#值变化范围在45.62~53.49之间，平均值为47.86；K2O+ Na2O含量变化于4.68%~7.03%之间，平均值为6.31%，属于碱性系列；富集Rb、Ba、K、Sr等大离子亲石元素（LILE）和轻稀土元素，亏损Ta、Nb、Zr、Ti等高场强元素（HFSE）和重稀土元素；与安徽段基性—超基性岩具有相似的野外特征和岩石地球化学性质。岩石成因研究显示，雷家湾辉长岩的幔源母岩浆有地壳物质的加入，作用方式应该为源区的混合，地壳物质的加入可能与三叠纪以来扬子板块向华北板块俯冲后加厚岩石圈的拆沉作用有关。大别造山带130 Ma左右基性—超基性岩的出现可能暗示构造体制由挤压向伸展转换。
Abstract:In order to reveal the genesis and tectonic background of basic rocks in Dabie orogenic belt, LA−ICP−MS zircon dating and geochemical analysis were carried out to discuss the diagenetic age and geochemical characteristics of Leijiawan gabbro in Muzidian area, North Dabie, and by comparing with the basic−ultrabasic rocks in Anhui section, the genesis and tectonic environment of Dabie orogenic basic−ultrabasic rocks are revealed. The results show that the diagenetic age of the Leijiawan gabbro in the Muzidian area of North Dabie is 122.3 ± 1.0 Ma. The SiO2 content of the Leijiawan gabbro is between 45.00% and 50.69%, with an average of 48.02%. The Mg# value ranged from 45.62 to 53.49, with an average of 47.86.The content of K2O + Na2O varied from 4.68% to 7.03%, with an average of 6.31 %, belonging to the alkaline series. It is enriched in light rare earth elements and large ion lithophile elements ( LILE ) such as Rb, Ba, K and Sr, and depleted in heavy elements and high field strength elements ( HFSE ) such as Ta, Nb, Zr and Ti. It has similar field and geochemical characteristics to the mafic−ultramafic rocks of Anhui. The petrogenesis study shows that the mantle−derived magma of Leijiawan gabbro was added with crustal materials, and the mode of action is the mixing in magma source. The addition of crustal material may be related to the delamination of thickened lithosphere after subduction of Yangtze plate to North China plate since Triassic. The occurrence of mafic−ultramafic rocks at ca. 130 Ma in Dabie orogenic belt may imply the structural system transforms from compression to extension.
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表 1 雷家湾辉长岩LA−ICP−MS锆石U−Th−Pb同位素分析结果
Table 1. Result of zircon LA−ICP−MS U−Th−Pb dating for the Leijiawan gabbro
分析号 含量/10−6 232Th/
238U同位素比值 同位素年龄/Ma 谐和度 Total
Pb232Th 238U 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ LJW-1-1 19.9 532 192 2.77 0.05060 0.0018 0.1335 0.0049 0.01916 0.00029 233.4 81.5 127.2 4.4 122.4 1.8 96% LJW-1-2 36.0 1082 451 2.40 0.04833 0.0011 0.1273 0.0031 0.01916 0.00026 122.3 53.7 121.7 2.8 122.4 1.7 99% LJW-1-3 8.9 236 139 1.70 0.04718 0.0019 0.1252 0.0057 0.01917 0.00034 57.5 92.6 119.7 5.2 122.4 2.1 97% LJW-1-4 22.5 654 211 3.10 0.04714 0.0016 0.1236 0.0039 0.01921 0.00036 57.5 74.1 118.4 3.5 122.7 2.3 96% LJW-1-5 50.0 1576 596 2.64 0.04815 0.0010 0.1271 0.0036 0.01911 0.00037 105.6 48.1 121.4 3.3 122.1 2.4 99% LJW-1-6 28.3 829 254 3.26 0.04949 0.0015 0.1303 0.0043 0.01912 0.00032 172.3 70.4 124.4 3.8 122.1 2.0 98% LJW-1-8 31.3 1014 274 3.70 0.04913 0.0015 0.1287 0.0042 0.01900 0.00029 153.8 76.8 122.9 3.8 121.3 1.8 98% LJW-1-10 6.4 72 129 0.56 0.04880 0.0023 0.1285 0.0061 0.01913 0.00034 200.1 104.6 122.7 5.5 122.1 2.2 99% LJW-1-11 30.1 937 359 2.61 0.04691 0.0012 0.1243 0.0036 0.01918 0.00030 42.7 63.0 119.0 3.3 122.5 1.9 97% LJW-1-12 53.3 1734 422 4.11 0.04685 0.0013 0.1235 0.0034 0.01918 0.00029 42.7 63.0 118.2 3.1 122.5 1.8 96% LJW-1-13 24.3 779 250 3.12 0.04875 0.0014 0.1291 0.0040 0.01921 0.00036 200.1 73.1 123.3 3.6 122.7 2.3 99% LJW-1-14 22.7 622 376 1.65 0.04901 0.0012 0.1299 0.0035 0.01922 0.00030 146.4 59.3 124.0 3.1 122.7 1.9 98% LJW-1-15 41.7 1316 362 3.63 0.04779 0.0013 0.1263 0.0038 0.01917 0.00031 100.1 58.3 120.8 3.4 122.4 2.0 98% LJW-1-16 4.7 85 97 0.88 0.04965 0.0024 0.1285 0.0060 0.01913 0.00044 189.0 119.4 122.7 5.4 122.2 2.8 99% LJW-1-18 24.9 778 230 3.38 0.05091 0.0015 0.1332 0.0039 0.01912 0.00032 235.3 66.7 127.0 3.5 122.1 2.0 96% LJW-1-19 14.2 385 225 1.71 0.04780 0.0016 0.1262 0.0046 0.01916 0.00035 100.1 77.8 120.7 4.2 122.4 2.2 98% LJW-1-20 31.5 1030 325 3.17 0.04847 0.0013 0.1275 0.0036 0.01912 0.00033 120.5 63.0 121.8 3.3 122.1 2.1 99% 
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表 2 雷家湾辉长岩主量、微量和稀土元素分析结果
Table 2. Major, trace and rare earth elements data for the Leijiawan gabbro
样号 PM407/3-1 PM407/4-1 PM407/7-1 LJW-1 LJW-2 LJW-3 LJW-4 SiO2 48.13 43.20 49.12 46.71 46.58 45.37 47.38 TiO2 1.63 2.14 1.71 1.70 1.65 1.75 1.57 Al2O3 16.16 11.41 16.20 14.84 15.52 14.76 16.02 Fe2O3 4.68 6.20 3.34 5.11 5.06 5.77 4.88 FeO 6.87 9.44 6.60 7.63 7.53 7.98 7.06 TFeO 11.08 15.02 9.61 12.23 12.08 13.17 11.45 MnO 0.17 0.18 0.15 0.18 0.18 0.19 0.18 MgO 4.72 8.10 5.58 5.40 5.12 5.69 4.88 CaO 6.67 9.55 6.43 8.39 8.16 8.48 7.78 Na2O 3.55 1.64 3.56 2.89 3.05 2.79 3.18 K2O 3.28 2.85 3.23 3.21 3.24 3.14 3.30 P2O5 1.30 1.30 0.98 1.44 1.40 1.46 1.26 烧失量 3.21 4.12 3.88 1.94 2.20 2.20 2.14 总量 100.37 100.13 100.78 99.44 99.69 99.58 99.63 Mg# 45.75 51.64 53.49 46.65 45.62 46.10 45.76 La 115 69.6 93.6 108 109 88.1 122 Ce 222 152 182 218 212 180 236 Pr 26.3 18.6 21.6 26.5 25.2 22.0 26.2 Nd 103 77.0 83.6 107 101 89.7 104 Sm 17.1 14.0 13.5 18.3 16.9 15.7 17.0 Eu 4.26 3.44 3.28 4.46 4.28 3.93 4.26 Gd 13.6 11.2 11.0 14.6 13.6 12.4 14.3 Tb 1.70 1.39 1.37 1.83 1.67 1.53 1.69 Dy 7.70 6.58 6.24 8.38 7.56 6.91 7.62 Ho 1.31 1.12 1.08 1.43 1.34 1.14 1.31 Er 3.27 2.73 2.67 3.55 3.20 2.79 3.30 Tm 0.410 0.350 0.340 0.460 0.410 0.370 0.400 Yb 2.46 2.15 2.05 2.78 2.49 2.25 2.48 Lu 0.310 0.280 0.260 0.350 0.320 0.300 0.330 Y 31.1 27.9 25.6 34.9 31.4 27.6 33.2 ΣREE 518 360 423 516 499 427 541 LREE 488 335 398 482 468 399 509 HREE 30.8 25.8 25.0 33.4 30.6 27.7 31.4 LREE/HREE 15.9 13.0 15.9 14.4 15.3 14.4 16.2 LaN/YbN 33.5 23.2 32.8 27.9 31.4 28.1 35.3 δEu 0.854 0.840 0.823 0.834 0.863 0.861 0.835 Rb 63.5 79.8 78.4 74.7 76.6 82.2 70.0 Ba 4000 4320 3890 4460 4560 4950 4370 U 0.700 0.820 0.440 1.41 0.990 1.21 0.840 Th 8.03 5.54 6.08 8.29 7.54 8.62 9.34 Ta 0.570 0.480 0.730 0.650 0.630 0.780 0.580 Nb 14.7 10.3 20.8 13.7 13.1 13.4 13.0 Pb 11.2 9.8 11.8 12.1 12.9 12.5 12.4 Sr 1880 895 1420 1780 1960 1720 2050 Zr 154 99 212 154 214 217 196 Hf 4.14 3.23 4.80 3.98 4.89 4.99 4.50 注：TFeO=FeO+Fe2O3*0.8998；Mg#=100*MgO/[MgO+0.505*(FeO+0.9*Fe2O3)]；δEu=Eu/Eu∗=2EuN/(SmN+GdN) ；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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表 3 大别造山带中生代基性—超基性岩年龄
Table 3. Isotope age of the Mesozoic mafic-ultramafic rocks from Dabie Orogenic belt
位置/岩体 岩性 年龄/Ma 定年方法 参考文献 小河口 闪长岩 127±6 TIMS锆石 李曙光等，1999 小河口 辉石岩 125.3±0.8 TIMS锆石 李曙光等，1999 祝家铺 闪长岩 130.2±1.4 TIMS锆石 李曙光等，1999 漆柱山 辉长岩 122.9±0.6 TIMS锆石 王江海等，2002 北大别 辉绿岩脉 128.3±0.1 全岩Ar−Ar Wang et al., 2005 北大别 煌斑岩 128.2±0.2 全岩Ar−Ar Wang et al., 2005 北大别 煌斑岩 129.6±0.2 全岩Ar−Ar Wang et al., 2005 北大别 辉绿岩脉 131.8±0.3 全岩Ar−Ar Wang et al., 2005 北大别 辉绿岩脉 127.6±0.2 全岩Ar−Ar Wang et al., 2005 沙村 辉长岩 128±2 TIMS锆石 Zhao et al., 2005 沙村 辉长岩 125±2 SHRIMP锆石 Zhao et al., 2005 沙村 辉长岩 125±3 SHRIMP锆石 Zhao et al., 2005 椒子岩 辉长岩 127±3 TIMS锆石 Zhao et al., 2005 金寨银沙畈 辉长岩脉 125.8±2.7 SHRIMP锆石 王世明等，2010 湖北大悟 闪斜煌斑岩脉 129.6±2.5 SHRIMP锆石 王世明等，2010 北淮阳 基性岩脉 129±1 SIMS锆石 Dai et al., 2011 道士冲 富斜长石角闪石岩 125±1 SIMS锆石 Dai et al., 2011 道士冲 富斜长石角闪石岩 129±1 LA−ICP−MS锆石 Dai et al., 2011 祝家铺 辉石岩 128±1 SIMS锆石 Dai et al., 2011 祝家铺 辉石岩 126±1 LA−ICP−MS锆石 Dai et al., 2011 祝家铺 富斜长石角闪石岩 126±2 SIMS锆石 Dai et al., 2011 祝家铺 富斜长石角闪石岩 126±1 LA−ICP−MS锆石 Dai et al., 2011 道士冲 角闪石岩 129±1 LA−ICP−MS锆石 Dai et al., 2012 祝家铺 角闪石岩 125±3 LA−ICP−MS锆石 Dai et al., 2012 道士冲 富斜长石角闪石岩 127±2 LA−ICP−MS锆石 Dai et al., 2012 祝家铺 角闪石岩 127±1 LA−ICP−MS锆石 Dai et al., 2012
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