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 KAr 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 Useries 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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李大明,李 齐,陈文寄.1999.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,45(7):892-894,[DOI]. Li Damin, Li Qi, Chen Wenji.1999. Excess Argon in Plagioclase Phenocryst of Tengchong Volcanics and the Related Volcano Erupting Stages[J]. Geological Review,45(7):892-894.