| 腾冲新生代火山群岩石化学和地球化学特征 |
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| 引用本文： | 陈廷方,赵崇贺.腾冲新生代火山群岩石化学和地球化学特征[J].西南科技大学学报,1995(4). |
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| 作者姓名： | 陈廷方 赵崇贺 |
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| 作者单位： | 西南工学院，中国地质大学 |
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| 摘 要： | Ｋ—Ａｒ法同位素年龄表明腾冲火山群喷发于板块闭合后的６０Ｍａ。火山喷发时腾冲地区已是大陆环境，而腾冲火山岩具有岛弧火山岩的岩石组合、岩石化学和地球化学特征，研究表明腾冲火山群为一种滞后型弧火山。这种弧火山具有高Ａｌ＿２Ｏ＿３、Ｋ＿２Ｏ，低ＴｉＯ＿２及强烈富集Ｚｒ、Ｒｂ、Ｓｒ、Ｂａ、Ｔｈ的地球化学特征。
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| 关 键 词： | 腾冲火山群，滞后型弧火山，地球化学 |
The Petfochemistry And Geochemistry Characteristics of Cenozoic Volcanic Groups From Teng Chong Area |
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| Chen tingfang,Zhao Chonghe.The Petfochemistry And Geochemistry Characteristics of Cenozoic Volcanic Groups From Teng Chong Area[J].Journal of Southwest University of Science and Technology,1995(4). |
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| Authors: | Chen tingfang Zhao Chonghe |
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| Institution: | Chen tingfang;Zhao Chonghe(Southwest Institute of Technology)(China University of Geosciences Beijing) |
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| Abstract: | According to the date of K-Ar Isochron ,Tengchong volcanism generated after sub-duction and collision about 60 Ma. Tengchong volcanic rocks possesses apparent character-istics of island-are volcanic rocks in rock Series,petrochemistry and geochemistry. Howev-er,before the volcanic eruption,Tengchong area have already changed into a continental in-tra-plate tectonic environment.Study shows that Tengchong volcanism is a delayed arc-volcanism. The Geochemical characteristics of this delayed arc-Volcanism are:high Al_2O_3K_2O Low TiO_2,enrichment Zr,Rb,Sr,Ba,Th. |
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| Keywords: | Tengchong volcanic groups Delayed arc-volcanism Geochemistry |
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