Zircon U-Pb age of the felsite porphyry veins in western Fuzhou basin of Fujian Province and its geological significance
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摘要:
通过对福州盆地西北缘发育的霏细斑岩脉野外地质特征、锆石U-Pb测年及地球化学研究，讨论其与福州复式花岗岩体的成因联系。研究区霏细斑岩呈紫灰色，局部可见明显的流动构造，主要由正长石斑晶组成，脉体呈北东向侵入于早期福州复式岩体中。研究结果显示，霏细斑岩脉形成于97.4Ma，具有钙碱性I型花岗岩的特征。该期岩浆活动形成于福州复式岩体的过渡期，且其地球化学特征与早白垩世钙碱性I型花岗岩、晚白垩世碱性A型花岗岩之间存在连续过渡的关系，反映其为福建东南沿海构造体制从弧后扩张向陆内伸展转换的产物，暗示该构造体制的转换时间约为97Ma。
Abstract:This paper presents U-Pb zircon geochronology, petrology, and major and trace elements of Cretaceous felsite porphyry veins in western Fuzhou basin, Fujian Province. These data were used to investigate the genetic relationship between felsite porphyry and Fuzhou composite granite body. Felsite porphyry shows purplish gray color and is mainly composed of orthoclase phenocrysts, and the well-developed flow structure is present on the margin. Felsite porphyry veins have a NE-trending strike and intruded into Fuzhou composite granite body. Felsite porphyry shows the features of calc-alkali and I-type granites, with the emplacement age being 97.4Ma; it was formed in the transition period between early Fuzhou composite granite body (111~100Ma) and late Fuzhou composite granite body (95~90Ma). The geochemical characteristics between the above three phase rock types present a graduallychanged transitional relation on the time scale. That is, this felsite porphyry is the product of the tectonic regimes conversion between Early and Late Cretaceous in southeastern China. The authors thus hold that the transformation age may be 97Ma.
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Key words:
- felsite porphyry /
- zircon U-Pb age /
- Late Cretaceous /
- western Fuzhou basin /
- geological significance
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表 1 霏细斑岩LA-ICP-MS锆石U-Th-Pb定年数据
Table 1. LA-ICP-MS zircon U-Th-Pb dating data of felsite porphyry
测点号 Th/10-6 U/10-6 同位素比值 年龄/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 40 34 0.0669 0.0096 0.124 0.0116 0.0156 0.0005 835 300 119.1 10.5 99.5 3.1 2 107 96 0.0505 0.0048 0.100 0.0080 0.0149 0.0003 217 217 96.6 7.3 95.1 2.1 3 58 38 0.0559 0.0079 0.110 0.0142 0.0166 0.0006 450 321 106.1 13.0 106.0 3.8 4 157 99 0.0517 0.0044 0.111 0.0083 0.0153 0.0003 272 190 106.9 7.6 97.8 1.6 5 499 365 0.0505 0.0029 0.107 0.0059 0.0154 0.0003 217 131 102.9 5.4 98.3 1.6 6 460 380 0.0417 0.0024 0.0848 0.0046 0.0149 0.0002 82.6 4.3 95.4 1.1 7 168 94 0.0656 0.0114 0.120 0.0175 0.0145 0.0005 794 369 115.4 15.9 92.8 2.9 8 256 263 0.0488 0.0025 0.100 0.0048 0.0151 0.0002 200 119 96.9 4.4 96.5 1.4 9 141 124 0.0483 0.0041 0.0971 0.0066 0.0153 0.0003 122 180 94.1 6.1 97.9 2.0 10 399 342 0.0528 0.0027 0.109 0.0052 0.0150 0.0002 320 110 105.0 4.8 96.2 1.2 11 450 296 0.0455 0.0027 0.0922 0.0048 0.0150 0.0002 89.6 4.4 95.9 1.3 12 137 69 0.0570 0.0067 0.121 0.0114 0.0160 0.0004 500 259 116.0 10.3 102.4 2.8 13 623 357 0.0480 0.0025 0.105 0.0053 0.0159 0.0002 98.2 119 101.4 4.9 101.6 1.3 14 1176 412 0.0496 0.0024 0.107 0.0050 0.0157 0.0002 176 115 103.6 4.6 100.6 1.2 15 791 531 0.0515 0.0022 0.114 0.0049 0.0160 0.0002 261 100 109.8 4.5 102.3 1.2 16 1145 518 0.0506 0.0020 0.108 0.0040 0.0156 0.0002 233 89 104.0 3.7 99.6 1.1 17 1033 622 0.0527 0.0017 0.110 0.0035 0.0151 0.0002 322 74 105.8 3.2 96.8 1.1 18 744 570 0.0470 0.0019 0.0957 0.0037 0.0148 0.0002 50.1 93 92.8 3.5 94.4 1.0 19 529 383 0.0558 0.0028 0.121 0.0059 0.0158 0.0002 443 111 116.4 5.4 101.2 1.3 20 561 148 0.0513 0.0035 0.104 0.0060 0.0152 0.0003 254 183 100.8 5.5 97.2 1.7 21 616 532 0.0484 0.0020 0.0980 0.0040 0.0147 0.0002 120 98 94.9 3.7 94.0 1.1 22 134 108 0.0503 0.0048 0.101 0.0079 0.0150 0.0003 209 207 98.2 7.3 96.3 2.1 23 38 36 0.0622 0.0112 0.145 0.0189 0.0178 0.0008 683 393 137.8 16.8 113.5 5.1 24 397 351 0.0510 0.0027 0.107 0.0053 0.0154 0.0002 239 122 103.5 4.9 98.8 1.4 25 2012 577 0.0497 0.0019 0.101 0.0036 0.0148 0.0002 189 82 98.0 3.3 94.7 1.0 
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表 2 霏细斑岩主量、微量和稀土元素分析结果
Table 2. Chemical compositions of major, trace and rare earth elements of felsite porphyry
SiO2 TiO2 Al2O3 TFe2O3 MnO MgO CaO Na2O K2O P2O5 LOI Total K2O/Na2O A/CNK σ 77.63 0.09 10.76 1.09 0.10 0.12 0.11 0.76 7.86 0.01 0.67 99.20 10.34 1.08 2.15 Rb Sr Ba U Th Nb Ta Zr Hf Ga Cr Cs Sn W V 342 42.1 1090 3.29 13.60 20.1 1.7 143 5.8 11.6 20 2.31 3 1 10 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y 26.6 46.4 4.84 15.4 3.19 0.36 3.23 0.66 3.82 0.91 3.00 0.52 3.65 0.63 29.0 注：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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