| 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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| 关键词:zircon Mashan group isotope geochronology eastern Heilongjiang |
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| Single-Grain Zircon Ages and Its Implications in Biotite-Plagioclase Gneiss in Mashan Group in the Eastern Heilongjiang |
| 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. |
| SONG Biao,LI Jin-yi,NIU Bao-gui,XU Wen-xi.1997.Single-Grain Zircon Ages and Its Implications in Biotite-Plagioclase Gneiss in Mashan Group in the Eastern Heilongjiang[J].Acta Geoscientica Sinica,18(3):306-312. |
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