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首页> 外文期刊>Chinese science bulletin >Zircon SHRIMP U-Pb dating of meta-diorite from the basement of the Songliao Basin and its geological significance
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Zircon SHRIMP U-Pb dating of meta-diorite from the basement of the Songliao Basin and its geological significance

机译：松辽盆地基底闪长岩的锆石SHRIMP U-Pb定年及其地质意义

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摘要

The basement of the Songliao Basin mainly contains low-grade metamorphic rocks and granites. It has been long disputed whether the basin has Precambrian metamorphic basement. This is a report of zircon SHRIMP U-Pb dating results of a meta-diorite sample, which was taken from the Si-5 drilling hole in the southern portion of the Songliao Basin. The SHRIMP analyses indicate that the meta-diorite with a weighted mean ~(207)Pb/~(206)Pb age of 1839±7 Ma (2sigma, n = 8) was emplaced during Paleo-Proterozoic time. Additionally, the meta-diorite has old Nd model ages (T_(DM1): 2999Ma; T_(DM2): 2849Ma). These data suggest that the southern part of the Songliao Basin do possess Precambrian basement.
机译：松辽盆地的基底主要含有低品位的变质岩和花岗岩。盆地是否具有前寒武纪变质基底一直存在争议。这是从松辽盆地南部Si-5钻孔中获取的闪长岩样品的锆石SHRIMP U-Pb测年结果​​的报告。 SHRIMP分析表明，在古元古代时期放置了加权平均年龄〜（207）Pb /〜（206）Pb的亚闪闪岩，其年龄为1839±7 Ma（2sigma，n = 8）。此外，亚闪长石具有旧的Nd模型年龄（T_（DM1）：2999Ma； T_（DM2）：2849Ma）。这些数据表明，松辽盆地的南部确实具有前寒武纪基底。

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