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| 苏鲁超高压变质带东海青龙山高压正片麻岩中白云母的^40Ar／^39Ar年代学研究 | |
| 引用本文： | 陈文,李曙光,张彦,刘新宇.苏鲁超高压变质带东海青龙山高压正片麻岩中白云母的^40Ar／^39Ar年代学研究[J].地质论评,2003,49(5):537-543. |
| 作者姓名： | 陈文 李曙光 张彦 刘新宇 |
| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037;中国科学院地质与地球物理研究所,北京,100029 2. 中国科学技术大学,合肥,230026 3. 中国地质科学院地质研究所,北京,100037 |
| 基金项目： | 国家自然科学基金，国土资源部国土资源大调查项目，国家重点基础研究发展计划(973计划)，49973003，2000020190118，G1999075503，，， |
| 摘 要： | 作为东海青龙山榴辉岩围岩的高压变质的正片麻岩，其白云母的常规^40Ar／^39Ar年龄和Rb—Sr、Sm—Nd年龄一致，激光微区Ar同位素分析表明，白云母的Ar同位素分布也是均匀的。由此得出的初步结论是：①高压变质的正片麻岩中的白云母中不含过剩Ar，这类矿物可以作为^40Ar／^39Ar同位素测年的对象；②青龙山榴辉岩中的白云母含大量过剩氩，而作为其围岩的超高压正片麻岩中的白云母却不含过剩氩，这一事实证明了榴辉岩中白云母的过剩氩不是来自围岩，而是榴辉岩自身继承的。 |
| 关 键 词： | 正片麻岩 高压白云母 过剩氩 超高压变质带 东海青龙山 同位素年代学 |
40Ar/39Ar Chronological Study of the Muscovite from Qinglongshan High-Pressure Orthogneiss, Donghai County,Su-Lu UHP-Metamorphic Belt |
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| CHEN Wen,LI Shuguang,ZHANG Yan,LIU Xinyu Institute of Geology,Chinese Academy of Geological Sciences,Beijing.40Ar/39Ar Chronological Study of the Muscovite from Qinglongshan High-Pressure Orthogneiss, Donghai County,Su-Lu UHP-Metamorphic Belt[J].Geological Review,2003,49(5):537-543. | |
| Authors: | CHEN Wen LI Shuguang ZHANG Yan LIU Xinyu Institute of Geology Chinese Academy of Geological Sciences Beijing |
| Institution: | CHEN Wen,LI Shuguang,ZHANG Yan,LIU Xinyu Institute of Geology,Chinese Academy of Geological Sciences,Beijing, Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing, The University of Science and Technology of Chin,Hefei |
| Abstract: | The conventional 40Ar/39Ar age of muscovite in high-pressure metamorphic orthogneiss, surrounding rocks of the Qinglongshan eclogite, is identical with its Rb-Sr and Sm-Nd ages. The Laser microprobe analysis shows that the argon isotope is evenly distributed in the muscovite. The preliminary conclusion is (1) muscovite in high-pressure metamorphic orthogneiss does not contain excess argon and can be the object for 40Ar/39Ar dating; (2) muscovite in the Qinglongshan eclogite contains large amounts of excess argon while muscovite in its surrounding rocks, i. e. high-pressure orthogneiss, does not contain excess argon. This fact proves that the excess argon of muscovite in eclogite does not come from its country rocks but from its inheritance. |
| Keywords: | orthogneiss high-pressure muscovite excess argon genesis |
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