| 准噶尔盆地东部的前晚奥陶世陆壳基底——来自盆地东北缘老君庙变质岩的证据 |
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| 引用本文： | 李锦轶, 肖序常, 陈文. 2000. 准噶尔盆地东部的前晚奥陶世陆壳基底——来自盆地东北缘老君庙变质岩的证据. 地质通报, 19(3): 297-302. |
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| 作者姓名： | 李锦轶 肖序常 陈文 |
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| 作者单位： | 中国地质科学院地质研究所 北京100037 |
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| 基金项目： | 国家科技攻关项目资助!(96 - 915 ) |
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| 摘 要： | 出露在准噶尔盆地东北缘的老君庙变质岩 , 主要由绿片岩相的石英片岩构成 , 其上残存含前泥盆纪床板珊瑚和海百合茎化石的大理岩。对石英片岩中的白云母进行的4 0 Ar/ 39Ar定年 , 获得了 (4 6 1.5± 0 .2 ) Ma的坪年龄和 (4 6 2 .0± 4 .1) Ma等时线年龄 , 表明该变质岩的变质时代不晚于中奥陶世晚期 , 准噶尔盆地东部具有前晚奥陶世的陆壳基底。结合区域地质资料 , 推测准噶尔盆地的基底主体是古生代期间的陆块。
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| 关 键 词： | 老君庙变质岩 白云母40Ar/39Ar定年 准噶尔盆地基底 古生代陆块 |
| 收稿时间： | 1999-09-06 |
Late Ordovician continental basement of the eastern Junggar Basin in Xinjiang, NW China: Evidence from the Laojunmiao metamorphic complex on the northeast basin margin |
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| 2000. Late Ordovician continental basement of the eastern Junggar Basin in Xinjiang, NW China: Evidence from the Laojunmiao metamorphic complex on the northeast basin margin. Geological Bulletin of China, 19(3): 297-302. |
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| Authors: | LI Jin-yi XIAO Xu-chang CHEN Wen |
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| Affiliation: | Institute of Geology, CAGS, Beijing 100037, China |
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| Abstract: | The Laojunmiao metamorphic complex, exposed on the northeastern margin of the Junggar basin, consists mainly of quartz schists of greenschist facies, with some marbles bearing pre Devonian tabulates and crinoids resting on it. 40 Ar/ 39 Ar dating of muscovite from the complex yields a plateau age of 461.5±0.2 Ma and an isochron age of 462.0±4.1 Ma, indicating that its metamorphism occurred in the late Middle Ordovician. In combination with regional geology, it is supposed that the basement of the basin is composed of the Paleozoic continental crust. |
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| Keywords: | Laojunmiao metamorphic complex muscovite 40 Ar/ 39 Ar dating basement of the Junggar basin Paleozoic continental crust |
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