A Study on Volcanic Minerals and Hosted Melt Inclusions in Newly-Erupted Tengchong Volcanic Rocks, Yunnan Province
详细信息
- 责任者：Li Ni (Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Zhang Liuyi
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(10)
- 关键词：火山岩 ; volcanic rocks ; 云南 ; Yunnan Province
- 页码：p.2842-2854
- 图表：6 illus., 8 tables, 28 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
///Tengchong volcanic clusters are located at the border area of western Yunnan Province and Myanmar.They consist of Heikong Mountain,Dakong Mountain,Xiaokong Mountain,Daying Mountain and Ma’an Mountain,etc.,which are famous Quaternary volcanic clusters in our country and are divided by oldly-and newly-erupted volcanoes.Previous work testified Daying,Ma’an and Heikong Mountains are newly-erupted ones,which had eruption activities in Late Pleistocene and Holocene epochs.The phenocrysts in these volcanic rocks are pyroxene,olivines and feldspars.The melt inclusions are found in hosted phenocrysts which have different shapes,randomly distributed and have some variations after entrapment.The compositional variation of melt inclusion in newly-erupted volcanic rocks is larger than that of matrix glass.The chemical compositions of melt inclusion and matrix glass have covered basaltic trachyandesite,trachyandesite,trachyte and rhyolite etc.,which are consistent with those of Late Pleistocene and Holocene volcanic rocks in Tengchong.According to EMP analyses of melt inclusions in hosted phenocrysts,microcrystals and matrix glass,the content of volatile chlorine doesn’t show large variations in melt inclusions and matrix glass,but those of volatile fluorine and SO3 do have more variations in melt inclusions than in matrix glass.In general,the degassing rate of newly-erupted Tengchong volcanic rocks was low and they didn’t emitted more gas to the atmosphere,thus had small effect on the climate and environment by speculation.Nevertheless,future disaster shouldn’t be ignored.
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