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Origin of the miocene bugasi group volcanic rocks in the cuoqin county, western tibetan plateau

文献类型:期刊论文

作者Chen, JL; Xu, JF; Kang, ZQ; Wang, BD
刊名Acta petrologica sinica
出版日期2006-03-01
卷号22期号:3页码:585-594
关键词Western tibet Cuoqin county N-s direction's graben Adakitic melt Shoshonitic Ar-ar isotope dating Miocene
ISSN号1000-0569
通讯作者Chen, jl(jifengxu@gig.ac.cn)
英文摘要It is generally believed that cenozoic potassic and ultrapotassic volcanic rocks in tibetan plateau are derived from a mantle source, but recent studies showed that some potassic rocks may also come from a lower crust. the miocene bugasi group volcanic rocks are a potassic to ultrapotassic volcanic suite distributed in the cuoqin county, western tibetan plateau. they are divided into two subgroups: the intermediate-acid group and the intermediate-basic group on the base of their geochemical composition. the both belong to shoshonitic series. volcanic rocks of the intermediate-acid group have some compositional features similar to an adakitic melt, hinting that they were probably generated by partial melting of the relatively k-rich mafic lower crust below the lhasa block. however, volcanic rocks of the intermediate-basic group were probably derived from a mantle that likely contains phlogopite, or generated via fractionation of a basalt-magma from this mantle. the plateau age (15.5 ma) of a intermediate-acid rock is determined by the ar-ar isotope dating, confirming that bugasi group volcanic rocks erupted in the late miocene. base on age, chemical composition, regional tectonic and magmatic association, we suggest that formation of bugasi group volcanic rocks was correlation with the n-s direction's grabens produced by tectonic extension in the southern tibetan plateau about 15 similar to 20ma.
WOS关键词LITHOSPHERIC MANTLE BENEATH ; SOUTHERN TIBET ; MAGMATISM ; CRUST ; EVOLUTION ; EXTENSION ; ADAKITES ; AGE ; GEOCHEMISTRY ; GENERATION
WOS研究方向Geology
WOS类目Geology
语种英语
WOS记录号WOS:000237332500007
出版者SCIENCE PRESS
URI标识http://www.irgrid.ac.cn/handle/1471x/2378910
专题中国科学院大学
通讯作者Chen, JL
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式
GB/T 7714
Chen, JL,Xu, JF,Kang, ZQ,et al. Origin of the miocene bugasi group volcanic rocks in the cuoqin county, western tibetan plateau[J]. Acta petrologica sinica,2006,22(3):585-594.
APA Chen, JL,Xu, JF,Kang, ZQ,&Wang, BD.(2006).Origin of the miocene bugasi group volcanic rocks in the cuoqin county, western tibetan plateau.Acta petrologica sinica,22(3),585-594.
MLA Chen, JL,et al."Origin of the miocene bugasi group volcanic rocks in the cuoqin county, western tibetan plateau".Acta petrologica sinica 22.3(2006):585-594.

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来源:中国科学院大学

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