Zircon U-Pb age and geochemistry of the dioritic rocks in Chuzhou area in Anhui Province: Petrogenesis and dynamics significance
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摘要:
用LA-ICP-MS测得安徽滁州2个闪长玢岩样品中锆石206Pb/238U年龄为126.19±0.44Ma和126.4±0.7Ma，结合前人研究，得出滁州地区岩体的侵位时代应为120~130Ma之间，为早白垩世。岩石地球化学研究显示，SiO2含量变化范围为56.75%~60.90%，具有高Al2O3（14.82%~15.77%）、MgO（> 4%）、Sr（> 750×10-6）、Sr/Y（62~110）、La/Yb（20~36），低Y、Yb的特征，同时富集轻稀土元素和大离子亲石元素，亏损高场强元素，Eu异常不明显，属于典型的埃达克质岩。Mg#值为39~45，K2O/Na2O值为0.57~0.96，平均值为0.75，明显低于大别造山带加厚下地壳埃达克岩，Ce/Pb值较低，大多集中在3~5之间，类似于陆壳而明显低于洋壳。研究认为，安徽滁州地区埃达克质岩由拆沉下地壳部分熔融形成，埃达克质岩浆在上升过程中与地幔橄榄岩发生反应，导致熔体MgO、Cr、Ni等含量增加。早白垩世中国东部地壳伸展减薄导致下地壳拆沉，地幔物质的参与带来铜、金等成矿物质，埃达克质岩可作为该地区重要的找矿标志。
Abstract:LA-ICP-MS zircon 206Pb/238U ages of two diorite porphyrite samples from Chuzhou area of Anhui Province are 126.19±0.44Ma and 126.4±0.7Ma, respectively. Previous study shows that the emplacement age of dioritic rocks should be 120~130Ma, sug-gesting early Cretaceous. Geochemical study shows the values of SiO2 vary from 56.75% to 60.90%, with the characteristics of high Al2O3(14.82%~15.77%), MgO(>4%), Sr(>750×10-6), Sr/Y(62~110), and La/Yb(20~36) but low Y, Yb, LREE as well as enrichment of LREE and LILE but depletion of HREE, with indistinct Eu anomaly, indicating typical adakitic rocks. Mg# values range from 39 to 45, K2O/Na2O vary from 0.57 to 0.96, 0.75 on average, significantly lower than the values of the adakitic rocks in the thickened crustal of Dabie orogenic belt; Ce/Pb ratios are low, mostly concentrated in the range of 3~5, similar to the values of the continental crust but significantly lower than those of the oceanic crust. The authors hold that the adakitic rocks in Chuzhou area of Anhui was formed by partial melting of delaminated lower crust, and the reaction of upward migrating adakitic magmas and mantle peridotite led to the increase of MgO, Cr and Ni melt content. In Early Cretaceous, eastern China crustal extension thinning resulted in lower crust delamination, and mantle material was involved in bringing Cu, Au and other ore-forming elements; hence adakitic rocks can be used as an important prospecting indicator in this area.
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致谢: 安徽省地矿局312地质队杨才波工程师帮助采集测试样品，中国地质科学院矿产资源研究所成矿作用与资源评价重点实验室侯可军、王倩等老师在锆石U-Pb同位素测试方面给予了很大的帮助，审稿专家提出了许多宝贵的意见和建议，在此一并表示感谢。
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图 1 研究区大地构造位置（a）及地质简图（b）
1—新元古代地层；2—寒武纪-奥陶纪地层；3—白垩纪-第四纪地层；4—花岗岩类；5—二长岩；6—断层；7—韧性剪切带；8—采样位置
Figure 1. Tectonic position of the study area(a) and geological sketch map(b)
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图版Ⅰ
a、b.马厂闪长玢岩野外露头照片；c、d.马厂闪长玢岩镜下照片；e.管店岩体闪长玢岩镜下照片；f.管店岩体细晶闪长岩镜下照片。Pl—斜长石；Am—角闪石；Qtz—石英；Kfs—钾长石；+为正交偏光；-为单偏光
图版Ⅰ.
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图 2 闪长玢岩锆石阴极发光图像及206Pb/238U年龄
Figure 2. Cathodoluminescence images and 206Pb/238U ages of zircon from the dioritic rocks
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图 7 稀土元素配分曲线及微量元素蛛网图（标准化值据参考文献[35]）
Figure 7. Chondrite-normalized REE patterns and primitive mantle-normalized trace element spider diagram
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图 8 安徽滁州地区岩浆岩埃达克质岩判别图解
Figure 8. The discrimination diagrams of the adakitic rocks in Chuzhou area of Anhui
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图 9 安徽滁州地区埃达克质岩的成因分类图解
（长江中下游埃达克质岩数据参考文献[27]）
Figure 9. Petrogenetic diagrams of the adakitic rocks in Chuzhou area of Anhui
表 1 LA-ICP-MS锆石U-Th-Pb同位素测定结果
Table 1 Results of the LA-ICP-MS zircon U-Th-Pb dating
样品 含量/10-6 Th/U 207Pb/206Pb 206Pb/238U 207Pb/206Pb 206Pb/238U Pb 232Th 238U 比值 1σ 比值 1σ 年龄/Ma 1σ 年龄/Ma 1σ 160309-1-1 13 350 576 0.61 0.0517 0.0019 0.0194 0.0002 272 92 124 2 160309-1-2 190 14 459 0.03 0.1638 0.0013 0.3711 0.0037 2415 186 2035 18 160309-1-3 7 180 273 0.66 0.0524 0.0021 0.0201 0.0002 128 103 128 2 160309-1-5 8 293 313 0.94 0.0514 0.0022 0.0212 0.0003 209 90 128 2 160309-1-6 115 96 228 0.42 0.1594 0.0015 0.4145 0.0029 2368 16 2234 13 160309-1-7 11 377 367 1.03 0.0545 0.0028 0.0224 0.0003 276 122 141 2 160309-1-8 33 75 47 1.60 0.1636 0.0019 0.4575 0.0046 2503 20 2414 20 160309-1-9 24 527 1060 0.50 0.0526 0.0009 0.0212 0.0002 172 44 125 1 160309-1-10 6 210 257 0.82 0.0514 0.0025 0.0292 0.0003 332 101 124 2 160309-1-12 11 185 485 0.38 0.0575 0.0017 0.0214 0.0003 169 84 128 2 160309-1-13 151 248 258 0.96 0.1636 0.0018 0.4242 0.0035 2454 19 2283 16 160309-1-14 52 613 254 2.42 0.0754 0.0011 0.1251 0.0011 787 36 730 6 160309-1-15 14 719 531 1.35 0.0578 0.0013 0.0213 0.0002 102 65 126 1 160309-1-16 13 344 546 0.63 0.0507 0.0016 0.0245 0.0002 232 68 126 1 160309-1-17 126 337 276 1.22 0.1202 0.0013 0.3125 0.0034 1976 14 1755 17 160309-1-18 186 183 306 0.60 0.1812 0.0023 0.4645 0.0045 2657 22 2444 20 160309-1-19 3 105 137 0.76 0.0528 0.0027 0.0234 0.0002 272 120 126 1 160309-1-20 44 72 133 0.54 0.1515 0.0019 0.2775 0.0059 2396 21 1541 3 160309-1-21 4 126 155 0.82 0.0543 0.0041 0.0214 0.0004 217 179 125 2 160309-1-22 5 170 181 0.94 0.0531 0.0038 0.0236 0.0003 183 167 125 2 160309-1-23 11 281 469 0.60 0.0502 0.0015 0.0218 0.0003 161 72 129 2 160309-1-24 3 82 153 0.53 0.0537 0.0038 0.0248 0.0003 376 156 124 2 160309-1-25 5 150 191 0.79 0.0524 0.0035 0.0256 0.0003 195 137 129 2 160309-2-1 373 178 735 0.24 0.1625 0.0014 0.4475 0.0045 2480 15 2345 20 160309-2-2 73 95 130 0.73 0.1643 0.0016 0.4328 0.0033 2486 16 2321 15 160309-2-3 21 24 61 0.40 0.1216 0.0032 0.2946 0.0027 2013 45 1660 13 160309-2-4 40 49 73 0.68 0.1528 0.0016 0.4428 0.0039 2367 17 2344 18 160309-2-5 3 71 124 0.57 0.0575 0.0036 0.0201 0.0004 233 168 128 2 160309-2-6 98 121 175 0.69 0.1656 0.0014 0.4426 0.0046 2502 14 2340 21 160309-2-7 2 46 78 0.59 0.0585 0.0062 0.0209 0.0006 309 277 130 4 160309-2-8 167 174 307 0.57 0.1736 0.0014 0.4345 0.0046 2532 13 2321 21 160309-2-9 242 274 398 0.69 0.1715 0.0015 0.4805 0.0049 2569 15 2522 21 160309-2-10 27 1329 986 1.35 0.0515 0.0015 0.0207 0.0002 217 48 126 1 160309-2-11 76 72 193 0.37 0.1225 0.0013 0.3445 0.0034 2014 18 1886 16 160309-2-13 98 102 182 0.56 0.1775 0.0017 0.4316 0.0043 2517 51 2324 20 160309-2-14 45 69 79 0.87 0.1636 0.0017 0.4318 0.0044 2505 18 2323 20 160309-2-15 9 323 359 0.90 0.0545 0.0039 0.0218 0.0004 187 174 127 2. 160309-2-16 97 66 244 0.27 0.1425 0.0018 0.3438 0.0052 2333 21 1902 25 160309-2-17 7 151 276 0.55 0.0558 0.0022 0.0236 0.0002 354 93 126 1 160309-2-18 3 97 103 0.94 0.0563 0.0044 0.0279 0.0004 317 189 128 2 160309-2-19 113 157 192 0.82 0.1779 0.0019 0.4346 0.0051 2514 20 2318 23 160309-2-20 2 61 91 0.68 0.0548 0.0045 0.0228 0.0006 250 202 127 4 
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表 2 岩石主量、微量和稀土元素组成
Table 2 Composition of major, trace and rare earth elements in rocks
样号 160309-2-1 160309-2-2 160309-2-3 160309-2-4 160309-2-5 160703-1 160703-2 160703-3 160729-5 160729-6 160729-7 160729-8 160729-1 160729-2 160729-3 160729-4 SiO2 59.46 59.23 58.71 58.48 58.95 56.98 56.75 56.91 60.38 60.68 60.66 60.90 59.14 59.35 59.58 59.69 Al2O3 15.44 15.40 15.22 15.06 15.32 15.77 15.66 15.70 14.82 14.88 14.88 14.87 14.98 14.99 14.94 14.86 CaO 2.97 3.27 4.37 4.40 3.23 5.85 5.76 5.44 4.04 3.85 3.69 3.84 5.68 5.36 5.34 5.09 TFe2O3 5.71 5.69 5.80 5.81 5.95 7.19 6.98 7.12 5.30 5.56 5.52 5.38 6.49 6.22 6.18 6.12 K2O 3.22 2.82 3.01 3.09 3.17 3.20 3.31 3.55 2.82 2.39 2.80 2.64 3.12 3.33 3.30 3.45 MgO 4.62 4.20 4.58 3.69 4.98 4.87 4.90 4.93 4.16 4.15 4.30 4.03 4.97 4.78 4.67 4.67 MnO 0.07 0.08 0.08 0.07 0.08 0.12 0.11 0.11 0.06 0.06 0.06 0.06 0.11 0.10 0.10 0.10 Na2O 3.88 4.68 3.75 3.92 4.10 3.86 3.93 3.69 4.09 4.21 4.11 4.26 3.76 3.77 3.77 3.74 P2O5 0.29 0.28 0.28 0.27 0.28 0.44 0.46 0.46 0.28 0.27 0.28 0.28 0.41 0.39 0.38 0.37 TiO2 0.58 0.58 0.55 0.56 0.57 0.81 0.82 0.79 0.68 0.68 0.69 0.68 0.74 0.73 0.73 0.73 烧失量 3.72 4.07 3.77 4.54 3.31 0.70 0.86 1.00 3.62 3.33 3.13 3.01 0.93 0.94 0.86 0.75 总计 99.96 99.98 99.98 99.89 99.94 99.79 99.54 99.70 99.98 99.97 99.96 99.95 99.89 99.96 99.85 99.57 Mg# 45 42 44 39 46 40 41 41 44 43 44 43 43 43 43 43 Rb 69.2 58.8 64.9 69.4 67.6 58.4 66.2 62.7 72.6 77.0 84.0 77.6 58.9 63.0 65.7 68.1 Ba 1320 1455 1455 2710 1315 2140 1915 2000 1535 1255 1425 1410 1995 2040 2010 2030 Th 4.85 4.60 4.73 4.85 4.73 4.83 5.44 4.47 7.54 7.59 7.82 7.84 6.20 7.20 8.20 7.20 U 2.91 1.90 1.53 1.52 2.57 1.35 1.92 1.29 1.74 1.99 1.84 1.80 1.80 2.00 2.10 1.90 Nb 6.0 5.8 5.8 5.7 5.8 6.8 7.1 6.7 8.0 8.1 8.3 8.2 8.2 8.4 9.0 9.10 Ta 0.5 0.5 0.5 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.6 0.6 0.7 0.70 Pb 17 15 13 11 16 20 25 18 8 9 8 7 21 25 20 26 Sr 871 831 1030 1050 864 1320 1270 1230 767 800 786 816 1045 967 977 968 Nd 18.6 17.9 21.9 20.7 20.5 27.7 27.8 27.0 28.8 29.4 27.1 30.0 29.5 29.5 29.4 29.8 Zr 146 135 140 137 137 191 177 178 189 195 201 195 165 199 201 218 Hf 3.60 3.3 3.6 3.4 3.5 4.8 4.4 4.4 4.6 4.7 4.9 4.8 4.2 5.1 4.8 5.6 Tb 0.32 0.31 0.38 0.36 0.35 0.51 0.51 0.50 0.46 0.46 0.46 0.48 0.60 0.50 0.50 0.60 Er 0.96 0.93 1.05 1.01 1.11 1.61 1.54 1.50 1.20 1.08 1.19 1.19 1.50 1.60 1.60 1.60 La 27.1 22.8 30.5 28.8 28.8 34.6 35.1 33.7 43.5 41.6 32.5 42.9 38.8 38.8 39.3 39.6 Ce 49.9 44.2 56.5 53.5 53.4 67.2 66.4 64.5 77.8 75.7 62.8 78.0 74.4 73.3 75.3 75.5 Pr 5.13 4.79 5.84 5.65 5.49 7.23 7.17 7.11 7.93 8.02 6.97 8.2 7.97 7.91 7.88 7.95 Nd 18.6 17.9 21.9 20.7 20.5 27.7 27.8 27 28.8 29.4 27.1 30 29.5 29.5 29.4 29.8 Sm 3.26 3.2 3.8 3.5 3.51 5.07 5 4.83 5 4.86 4.83 5.25 5.26 5.43 5.01 5.42 Eu 0.97 0.93 1.21 1.1 1.12 1.61 1.54 1.56 1.46 1.47 1.51 1.48 1.59 1.47 1.52 1.56 Gd 2.48 2.38 2.93 2.82 2.9 4.08 4.01 4.05 3.82 3.77 3.97 3.94 4.09 4.04 4.08 4.09 Tb 0.32 0.31 0.38 0.36 0.35 0.51 0.51 0.5 0.46 0.46 0.46 0.48 0.58 0.53 0.51 0.55 Dy 1.62 1.62 1.86 1.85 1.82 2.78 2.64 2.74 2.4 2.24 2.41 2.37 2.9 2.85 2.81 2.87 Ho 0.34 0.34 0.37 0.36 0.38 0.54 0.56 0.53 0.45 0.42 0.44 0.45 0.56 0.55 0.56 0.57 Er 0.96 0.93 1.05 1.01 1.11 1.61 1.54 1.5 1.2 1.08 1.19 1.19 1.51 1.55 1.59 1.61 Tm 0.15 0.15 0.16 0.15 0.15 0.21 0.21 0.21 0.16 0.15 0.16 0.16 0.21 0.23 0.22 0.23 Yb 0.81 0.79 0.99 0.9 0.95 1.25 1.24 1.33 0.85 0.83 0.91 0.94 1.33 1.32 1.26 1.39 Lu 0.13 0.13 0.14 0.13 0.13 0.19 0.18 0.18 0.13 0.12 0.13 0.12 0.2 0.21 0.2 0.21 Y 8.7 8.6 10.1 9.5 9.9 14.8 14.3 14.2 11.7 11.4 11.9 11.7 15.5 15.2 15.7 15.4 Sr/Y 100.1 96.6 102.0 110.5 87.3 89.2 88.8 86.6 65.6 70.2 66.1 69.7 67.4 63.6 62.2 62.9 δEu 1.00 0.99 1.07 1.04 1.04 1.05 1.02 1.05 0.98 1.01 1.02 0.95 1.01 0.92 1.00 0.97 注:Mg#=100×Mg2+/(Mg2++TFe2+); 主量元素含量单位为%，微量和稀土元素为10-6
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