| 黑龙江省东部麻山群黑云斜长片麻岩中锆石的年龄及其地质意义 |
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| 引用本文：宋彪,李锦轶,牛宝贵,徐文喜.1997.黑龙江省东部麻山群黑云斜长片麻岩中锆石的年龄及其地质意义[J].地球学报,18(3):306-312. |
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| 中文摘要:采自西麻山煤矿附近的麻山群黑云斜长片麻岩中，分离出了较多的锆石。采用单颗粒锆石逐级蒸发 沉积法对其进行了定年研究，获得的１０粒锆石的２０７Ｐｂ／２０６Ｐｂ年龄相当一致，平均值为５２７．５±４．４Ｍａ。所测岩样经岩石学和矿物学研究均未发现有显著的后期叠加变质作用，因此，可以认为所测样品的主变质作用发生在寒武纪早－中期，而不是早前寒武纪。麻山群的原岩时代可能也不全是早前寒武纪，而更可能是一个较复杂的岩石构造地层单位，需要将其解体、重新认识和命名。 |
| 中文关键词:锆石 麻山群 同位素地质年代学 黑龙江东部 |
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| Single-Grain Zircon Ages and Its Implications in Biotite-Plagioclase Gneiss in Mashan Group in the Eastern Heilongjiang |
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| Abstract:The Mashan group occurred close to the Jixi City, eastern Heilongjiang Province, has been regarded as one of the oldest metamorphosed supracrustal rocks that were undergone high amphibolite facies to granulite facies metamorphism, but there were no enough evidence. Zircon grains separated from the biotite plagioclase gneiss of the group sampled from the Ximashan Coal Mine were dated by Kober's method (step evaporation) on mass spectrometer MAT261. The zircons are simple. 207 Pb/ 206 Pb ages of 10 grains are from 510.7±6.4 Ma to 539.0±1.7 Ma, of 7 being 525.9±2.6 Ma～ 529.4±1.7 Ma, and the average age is 527.5±4.4 Ma. The 527.5±4.4 Ma is interpreted as the main metamorphism in the area. |
| keywords:zircon Mashan group isotope geochronology eastern Heilongjiang |
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