| 腾冲火山岩斜长石斑晶的过剩氩兼论火山活动的分期 |
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| 引用本文： | 李大明,李 齐,陈文寄.腾冲火山岩斜长石斑晶的过剩氩兼论火山活动的分期[J].地质论评,1999,45(7):892-894. |
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| 作者姓名： | 李大明 李 齐 陈文寄 |
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| 作者单位： | 中国地震局地质研究所，北京 1000029 |
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| 基金项目： | 本文得到中国地震局“九五”重点项目(编号 9511)的资助。 |
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| 摘 要： | 在腾冲黑空山、打鹰山和马鞍山火山岩的斜长石斑晶里首次发现存在过剩氩，并从基质中得到比以往的全岩年龄更年轻的KAr年龄，论证了以往所发表这一时间段的KAr 年龄结果可能因过剩氩而偏老，结合马鞍山已经取得的10 ka左右的U系年龄结果认为，腾冲最近一期火山活动的终止时间应为全新世。
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| 关 键 词： | 腾冲 斜长石斑晶 过剩氩 火山活动 |
Excess Argon in Plagioclase Phenocryst of Tengchong Volcanics and the Related Volcano Erupting Stages |
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| Li Damin,Li Qi and Chen Wenji.Excess Argon in Plagioclase Phenocryst of Tengchong Volcanics and the Related Volcano Erupting Stages[J].Geological Review,1999,45(7):892-894. |
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| Authors: | Li Damin Li Qi and Chen Wenji |
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| Institution: | Institute of Geology, China Seismological Bureau, Beijing, 100029 |
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| Abstract: | It has been found for the first time that excess argon exists in plagioclase p henocryst in Tengchong Heikongshan, Dayingshan and Maan shan volca nics. The K Ar ages obtained from the matrix are younger than those of the whol e rocks, which demonstrates that the published volcanic ages belonging to the Quat ernary are older than their forming time because of the excess argon. Combined w ith the U series dating in the Maanshan volcano, it was considered that the end time of the latest volcanic eruption in the Tengchong area was in Holocene. |
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| Keywords: | Tengchong plagioclase phenocryst excess argon volcanism |
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