| 滇西时代不明变质岩系的解体和时代厘定 |
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| 引用本文： | 王国芝,刘登忠,朱利东,陶晓风,李佑国.滇西时代不明变质岩系的解体和时代厘定[J].地质通报,2000,19(1):32-37. |
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| 作者姓名： | 王国芝 刘登忠 朱利东 陶晓风 李佑国 |
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| 作者单位： | 成都理工学院,四川,成都,610059 |
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| 摘 要： | 建立在岩石组合、变质、变形、碎屑组分和同位素年代学基础上的研究成果表明，滇西时代不明变质岩系是两个时代不同的构造岩片，分别相当于中元古界崇山群和二叠系吉东龙组，二者是喜山期构造混杂带的重要组成部分。崇山群在晚元古时期(727～956
Ma)发生区域性的动热变质作用，加里东时期(397 Ma)又叠加了一次变质作用。吉东龙组中有喜山期(32
Ma)变质作用的叠加。
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| 关 键 词： | 混杂岩 时代不明变质岩系 崇山群 吉东龙组 同位素年代学 |
| 文章编号： | 1000-3967(2000)01-0032-06 |
| 修稿时间： | 1998-09-21 |
Analysis of the undating metamorphics in West Yunnan and determination of its age |
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| WANG Guo-zhi,LIU Deng-zhong,ZHU Li-dong,TAO Xiao-feng,LI You-guo.Analysis of the undating metamorphics in West Yunnan and determination of its age[J].Geologcal Bulletin OF China,2000,19(1):32-37. |
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| Authors: | WANG Guo-zhi LIU Deng-zhong ZHU Li-dong TAO Xiao-feng LI You-guo |
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| Affiliation: | WANG Guo-zhi
(Chengdu University of Technology, Chengdu 610059, China)
LIU Deng-zhong
(Chengdu University of Technology, Chengdu 610059, China)
ZHU Li-dong
(Chengdu University of Technology, Chengdu 610059, China)
TAO Xiao-feng
(Chengdu University of Technology, Chengdu 610059, China)
LI You-guo
(Chengdu University of Technology, Chengdu 610059, China) |
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| Abstract: | On the basis of the study on its association, metamorphism, deformation, composition of debris and isotope geochronology, it indicates that West Yunnan undating metamorphics belongs to tectonic rock sheets of quite different two periods,the Middle Proterozoic Chongshan Group and the Permian Jidonglong Formation ,respectively,both of which are the dominant components of the Himalayan mixtite belt.One regional dynamothermal metamorphism took place in Chongshan Group during Upper Proterozoic Subera (727-956Ma) , and another metamorphism superimposed it during Caleodonia period (397Ma), compared with superimposed metamorphisms in Jidonglong Formation during Himalayan period (32Ma). |
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| Keywords: | mixtite undating metamorphics Chongshan Group Jidonglong Formation isotopic geochronology |
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