| 中朝板块北缘乌华敖包地块Sm－Nd同位素等时线年龄及其意义 |
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| 引用本文： | 徐备,陈斌,张臣,白志强,王宏伟,张强.中朝板块北缘乌华敖包地块Sm－Nd同位素等时线年龄及其意义[J].地质科学,1994,29(2):168-172. |
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| 作者姓名： | 徐备 陈斌 张臣 白志强 王宏伟 张强 |
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| 作者单位： | 北京大学地质学系, 北京100871 |
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| 摘 要： | 内蒙苏尼特左旗西南马华敖包地块绿泥绿市阳起片岩的Sm-Nd同位素全岩等时线年龄为1910±72Ma,表明这个位于中朝板块北缘古生代造山带内的地块属早元古代。样品的εNd(t)值为3.87-4.07,属中等─弱亏损地馒型,其构造背景为过渡性大陆边缘。
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| 关 键 词： | Sm－Nd等时线 古地块 早元古代 |
| 收稿时间： | 1993-09-20 |
| 修稿时间： | 1993-09-20; |
Sm-Nd ISOCHRON AND SIGNIFICANCE OF THE WUHUAOUBAO BLOCK IN NORTHERN MARGIN OF SINO-KOREAN PLATE |
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| Xu Bei,Chen Bin,Zhang Chen,Bai Zhiqiang,Wang Hongwei,Zhang Qiang.Sm-Nd ISOCHRON AND SIGNIFICANCE OF THE WUHUAOUBAO BLOCK IN NORTHERN MARGIN OF SINO-KOREAN PLATE[J].Chinese Journal of Geology,1994,29(2):168-172. |
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| Authors: | Xu Bei Chen Bin Zhang Chen Bai Zhiqiang Wang Hongwei Zhang Qiang |
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| Institution: | Department of Geology, Peking University, Beijing 100871 |
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| Abstract: | uhuaoubao block which located in the early Paleozoic orogenic belt of northern margin of the Sino-Korean Plate, consists of guesses, quartz-schists, marble and chlorite epidote actinolite-schists. Four whole-rock samples from the actinolite-schists have been analysed. A Sm-Nd isochron of 1910±72 Ma has been determined and been used as an igneous age of the actinolite-schists. The date suggests that the Wuhuaoubao block belongs to an early Proterozoic block. εNd(t)values of the four samples are from 3.87 to 4.07, which give a proof of that the block formed in a transitional continental margin. |
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| Keywords: | m-Nd isochron ancient block early Proterozoic |
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