U-Pb ZIRCON AGE OF LIANHUASHAN PLUTON IN THE JUNCTION OF ANHUI-ZHEJIANG-JIANGXI PROVINCES: Geological Implication
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摘要:
皖浙赣交界莲花山岩体位处扬子板块东南缘，即扬子板块与华夏板块结合带之东段（江南造山带东段北缘）.该岩体侵入于新元古代末期的上墅组（赣东北），岩性主要为正长花岗岩及花斑岩，后期因变质变形作用而发生面理化并具有绿片岩相浅变质矿物组合.地球化学特征指示，莲花山花岗岩很有可能为形成于大陆边缘后造山环境的A2型花岗岩.锆石LA-ICP-MS U-Pb定年结果显示岩体年龄为878±70 Ma，为晋宁晚期的产物.
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关键词:
- 江南造山带 /
- 莲花山花岗岩 /
- 锆石LA-ICP-MS U-Pb定年 /
- 地球化学特征 /
- 岩石成因
Abstract:The Lianhuashan pluton in the junction of Anhui-Zhejiang-Jiangxi provinces is located in the southeast margin of Yangtze Plate, namely the junction zone of Yangtze Plate and Cathaysia Plate (the northern margin of eastern section of Jiangnan orogenic belt). The pluton intruded into the late Neoproterozoic Shangshu Formation (northeastern Jiangxi), with the lithology of syenogranite and granophyres. In later period, the metamorphic deformation resulted in foliated and greenschist facies epimetamorphic mineral assemblage. The geochemical characteristics indicate that the Lianhuashan granite is probably A2 type formed in continental margin post-orogenic environment. The zircon LA-ICP-MS U-Pb dating of the pluton yields the age of 878±70 Ma, which is the product of late Jinning Period.
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表 1 莲花山岩体主量元素分析结果
Table 1. Contents of major elements in Lianhuashan pluton
样品号 HX014-1 HX014-2 HX015-1 HX015-2 HX016-1 HX016-2 SiO2 77.15 75.83 76.92 76.37 76.95 77.48 TiO2 0.05 0.17 0.18 0.11 0.12 0.09 Al2O3 12.44 12.57 11.61 12.37 12.02 11.74 Fe2O3 0.9 0.83 0.55 0.66 0.95 0.98 FeO 0.08 0.77 0.85 0.32 0.37 0.22 MgO 0.05 0.19 0.13 0.08 0.05 0.02 MnO 0.02 0.03 0.02 0.02 0.03 0.02 CaO 0.2 0.46 0.47 0.28 0.67 0.48 Na2O 3.27 3.43 2.82 2.57 3.39 3.21 K2O 5.05 4.73 5.29 6.39 4.76 5.08 P2O5 0.01 0.02 0.01 < 0.01 < 0.01 < 0.01 烧失量 0.67 0.77 0.99 0.71 0.5 0.51 含量单位: %. 
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表 2 莲花山岩体微量元素分析结果
Table 2. Contents of trace elements in Lianhuashan pluton
样品编号 HX014-1 HX014-2 HX015-1 HX015-2 HX016-1 HX016-2 Y 74 68.7 63.7 76.2 68.2 79.7 Zr 76.1 196 159 116 153 158 Nb 14.7 12.1 11.9 13.8 11.5 13.7 Cs 7.38 4.68 5.4 5.88 4.7 7.17 Ba 33.6 839 374 140 677 571 La 11.1 49.1 64.7 44.2 65.8 43.2 Ce 35.5 86 132 98.5 126 77.8 Pr 3.52 11.8 15.7 12.4 14.9 11 Nd 13.7 46.1 61.6 52.1 57.4 44.4 Sm 4.46 10.4 12.6 12.3 11.6 10.5 Eu 0.07 1.21 0.71 0.6 1.04 0.83 Gd 6.36 10.4 12 12.7 11.2 11 LREE/HREE 0.61 1.88 2.76 1.79 2.52 1.49 Tb 1.51 1.78 1.88 2.13 1.85 1.98 Dy 10.9 10.9 11.2 12.8 11.2 12.7 Ho 2.37 2.24 2.14 2.6 2.29 2.69 Er 7.27 6.51 6.07 7.44 6.73 8.09 Tm 1.15 0.97 0.87 1.05 0.94 1.2 Yb 8.07 6.23 5.61 7.23 6.32 7.93 Lu 1.16 0.9 0.78 1.02 0.91 1.11 Hf 3.83 6.6 5.78 5.3 5.37 6.01 Ta 1.91 1.05 0.84 1.23 0.84 1.27 Pb 36.8 30.2 33.9 47.9 42.7 55.2 Th 12.6 15.4 19.4 25.9 16.6 18.6 U 4.53 2.88 2.89 3.7 3.22 3.78 LaN/YbN 0.15 0.71 1.01 0.58 0.96 0.54 Li 6 20.3 24.7 14.6 11.3 3.54 Be 2.71 3.34 1.84 2.14 2.03 3.21 Sc 4.97 6.46 6.01 8.19 7.26 7.22 V 1.67 8.02 3.98 1.77 1.88 0.82 Cr 0.71 3.09 1.29 0.68 2.22 0.41 Co 0.35 1.51 1.2 0.72 0.41 0.18 Ni 1.25 1.95 1.1 5.79 0.63 0.33 Sr 13.9 39.1 22.3 14.3 26.9 24.7 Zn 36.7 55.3 59.2 41.1 68.3 60.6 Ga 18.2 18.1 16.5 18.1 18.6 18.8 Rb 276 185 175 230 147 142 δEu 0.04 0.36 0.18 0.15 0.28 0.24 ∑REE 737.21 1781.42 1322.31 1042.93 1590.38 1414.35 含量单位: 10-6.
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表 3 LA-ICP-MS锆石U-Th-Pb分析结果
Table 3. The LA-ICP-MS zircon U-Th-Pb analysis results
点号 浓度/10-6 Th/U 同位素比值 年龄/Ma Pb* 232Th 238U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1 154.5 476.8 991.1 0.46 0.0663 0.0015 1.2243 0.0305 0.1330 0.0014 815 48 812 14 805 2 332.7 1240 1836 0.64 0.0663 0.0013 1.3425 0.0254 0.1460 0.001 817 40 864 11 878 3 168.5 632.5 962 0.62 0.0674 0.0014 1.3154 0.0273 0.1407 0.0009 850 44 852 12 849 4 97.9 284.1 653.2 0.41 0.0669 0.0013 1.1985 0.0227 0.1294 0.0012 835 39 800 10 784 5 85.7 316 582.8 0.51 0.0706 0.0017 1.1941 0.0295 0.1219 0.0011 946 51 798 14 742 6 179.8 473.9 1132 0.39 0.0646 0.0012 1.2361 0.0248 0.1379 0.0012 761 240 817 11 833 7 210.1 454.5 1337 0.32 0.0672 0.0011 1.2923 0.0228 0.1386 0.0011 856 35 842 10 837 8 104.1 281.3 641.6 0.41 0.0668 0.0014 1.2880 0.0258 0.1393 0.0010 831 43 840 11 840 9 178.2 367.4 1131 0.31 0.0675 0.0012 1.3000 0.0240 0.1388 0.0010 854 42 846 11 838 10 21.8 105.5 111.7 0.89 0.0683 0.0024 1.4042 0.0475 0.1496 0.0017 876 125 891 20 899 11 51.4 140.7 333.4 0.4 0.0657 0.0016 1.1963 0.0287 0.1314 0.0010 796 55 799 13 796 12 269.5 1141 1778 0.57 0.0704 0.0015 1.2269 0.0257 0.1260 0.0010 939 44 813 12 765 13 120.9 278 794.5 0.33 0.0708 0.0018 1.2803 0.0332 0.1303 0.0011 954 55 837 15 790 14 53 195.5 336.2 0.54 0.0644 0.0014 1.1616 0.0257 0.1304 0.0010 767 245 783 12 790
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