Zircon U-Pb age, Sr-Nd isotopic characteristics and its geological significance of the granites from the Meixian zinc-lead polymetallic deposit, central Fujian Province
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摘要:
为探讨闽中梅仙矿区花岗岩的成因，对小焦、寨头、根竹园花岗岩体的岩相学、年代学和Sr-Nd同位素特征进行研究。LA-ICP-MS锆石U-Pb测年结果显示，小焦花岗岩体的结晶年龄为158±3Ma，形成于燕山中期晚侏罗世。同位素分析显示，样品具有高ISr（0.707099~0.710082）和低εNd（t）（-9.79~-10.92）的特点，显示明显的壳源特征，其岩石成因类型属高分异的I型花岗岩。结合前人最新的研究成果表明，梅仙矿区燕山中期花岗岩形成于古太平洋板块向欧亚板块的俯冲-消减的伸展拉张环境，是板内伸展造山阶段的产物。
Abstract:In order to discuss the genesis of the granites in the Meixian orefield of central Fujian Province, this paper reports petrography, geochronology and Sr-Nd isotope data. Zircon U-Pb dating yielded an age of 158±3Ma for the Xiaojiao granites, indicating that they were formed in Late Jurassic in the middle Yanshanian period. Isotopically, sample analyses show high and variable initial ISr ratios (0.707099~0.710082) but low and constant εNd(t) (-9.79~-10.92), showing crust source characteristics obviously and indicating that Meixian granites are highly fractionated I-type granites. Combined with previous research results, it is held that the granites of the middle Yanshanian period in Meixian area were formed by the sub-reduction stretching and extension of the paleo-Pacific plate to the Eurasian plate, and were emplaced at the extention orogenic stage within the plate.
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Key words:
- geochronology /
- Sr-Nd isotope /
- granites /
- Meixian /
- central Fujian Province
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表 1 梅仙矿区花岗岩类LA-ICP-MS锆石U-Th-Pb测试结果
Table 1. LA-ICP-MS zircon U-Th-Pb dating results for the granites from the Meixian orefield
点号 Th/U 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 小焦岩体 XJ-4-01 0.79 0.0527 0.0019 0.1782 0.0064 0.0244 0.0005 317 83 166 6 156 3 XJ-4-02 0.64 0.0560 0.0018 0.1950 0.0074 0.0251 0.0008 454 67 181 6 160 5 XJ-4-05 0.46 0.0540 0.0010 0.1877 0.0049 0.0250 0.0005 372 42 175 4 159 3 XJ-4-06 0.66 0.0571 0.0018 0.1969 0.0068 0.0250 0.0006 494 72 183 6 159 4 XJ-4-07 0.73 0.0586 0.0013 0.2038 0.0048 0.0252 0.0005 554 52 188 4 160 3 XJ-4-12 0.99 0.0559 0.0020 0.2001 0.0090 0.0258 0.0007 456 79 185 8 164 4 XJ-4-13 0.54 0.0572 0.0019 0.1862 0.0058 0.0236 0.0006 498 67 173 5 150 4 XJ-4-14 0.62 0.0598 0.0016 0.1952 0.0056 0.0237 0.0006 598 57 181 5 151 4 XJ-4-17 0.88 0.0521 0.0021 0.1814 0.0080 0.0251 0.0006 287 90 169 7 160 4 
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表 2 梅仙地区花岗岩Rb-Sr和Sm-Nd同位素测试结果
Table 2. Rb-Sr and Sm-Nd isotopic analyses of granite in Meixian area
样号 岩性 Rb/10-6 Sr/10-6 87Rb/86Sr 87Sr/86Sr 2σ ISr Sm/10-6 Nd/10-6 147Sm/144Nd 143Nd/144Nd 2σ εNd（t） ZT-1 黑云母花岗斑岩 233 76.7 8.80490 0.727434 8 0.708033 4.39 21.30 0.124529 0.512063 4 -9.79 ZT-2 黑云母花岗斑岩 247.3 92 7.79098 0.727249 8 0.710082 4.13 21.21 0.117650 0.512022 4 -10.46 GZY-1 黑云母花岗斑岩 268.2 86.3 9.00961 0.729652 7 0.709800 3.99 17.46 0.138074 0.512048 3 -10.35 XJ-4 花岗斑岩 322.1 65.6 14.24686 0.738491 10 0.707099 4.63 22.18 0.126126 0.512007 4 -10.92 XJ-5 花岗斑岩 325.4 70.2 13.44830 0.737417 7 0.707785 4.73 22.64 0.126232 0.512015 7 -10.76 XJ-6 花岗斑岩 316.6 82.5 11.13043 0.734304 6 0.709779 5.66 23.54 0.145276 0.512030 6 -10.85
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