Chronology, geochemistry and tectonic significances of the Cenozoic Zougouyouchacuo and Nadingcuo volcanic rocks in northern Tibetan Plateau

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	Chronology, geochemistry and tectonic significances of the Cenozoic Zougouyouchacuo and Nadingcuo volcanic rocks in northern Tibetan Plateau
其他题名	Chronology, geochemistry and tectonic significances of the Cenozoic Zougouyouchacuo and Nadingcuo volcanic rocks in northern Tibetan Plateau
	Liu JianFeng 1; Chi XiaoGuo 1; Zhao XiuYu 1; Zhao Zhi 1; Dong ChunYan 2; Li GuangRong 3; Zhao YuanDong 4
	2009
发表期刊	ACTA PETROLOGICA SINICA
ISSN	1000-0569
卷号	25 期号:12 页码:3259-3274
摘要	This paper reported petrology, geochronology and geochemistry of the Cenozoic volcanics from Zougouyouchacuo and Nadingcuo in South Qiangtang area, northern Tibetan Plateau. The volcanic rock in the study area is mainly composed of trachybasalt, mugearite, latite and trachyte. The volcanics show evolutionary trend from alkaline series to high-K calk-alkaline series. Zircon U-Pb dating indicates the volcanic rocks in Zougouyouchacuo and Nadingcuo area were formed in 34. 64 +/- 0. 55Ma and 35. 03 +/- 0. 54Ma respectively, besides there are lots of captured zircons in Zougouyouchacuo latite and trachyte. All of the samples have positive epsilon(Hf)( t) values, but epsilon(Hf)(t) decreases with the increase of SiO2. The fractionation between LREE and HREE is obvious, without or having minor negative Eu anomalies. The fractionation between HREE is also notable, with (Sm/Yb)(N) = 6.30 similar to 8.25, which indicates the primary magma originated from weakly depleted garnet-bearing asthenosphere. Through analysis the adakitic geochemical characteristics of the intermediate-acid magma in the area is formed by AFC (assimilation and fractional crystallization) of primary mantle-originated magma. The Late Eocene volcanism in South Qiangtang area may have relation to the upwelling of asthenosphere caused by breaking-off of northward subducted Lhasa lithosphere mantle.
关键词	MC-ICP-MS MANTLE SOURCE QIANGTANG PETROGENESIS ALKALINE CONSTRAINTS EVOLUTION HF Tibetan Plateau Cenozoic volcanic rocks Adakite Geochemistry South Qiangtang area
收录类别	CSCD
语种	英语
CSCD记录号	CSCD:3801826
引用统计	被引频次：10[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/151837
专题	中国科学院金属研究所
作者单位	1.吉林大学 2.Chinese Acad Geol Sci, Institute Geol, Beijing 100037, Peoples R China Institute Geol 3.南京大学 4.中国科学院金属研究所
推荐引用方式 GB/T 7714	Liu JianFeng,Chi XiaoGuo,Zhao XiuYu,et al. Chronology, geochemistry and tectonic significances of the Cenozoic Zougouyouchacuo and Nadingcuo volcanic rocks in northern Tibetan Plateau[J]. ACTA PETROLOGICA SINICA,2009,25(12):3259-3274.
APA	Liu JianFeng.,Chi XiaoGuo.,Zhao XiuYu.,Zhao Zhi.,Dong ChunYan.,...&Zhao YuanDong.(2009).Chronology, geochemistry and tectonic significances of the Cenozoic Zougouyouchacuo and Nadingcuo volcanic rocks in northern Tibetan Plateau.ACTA PETROLOGICA SINICA,25(12),3259-3274.
MLA	Liu JianFeng,et al."Chronology, geochemistry and tectonic significances of the Cenozoic Zougouyouchacuo and Nadingcuo volcanic rocks in northern Tibetan Plateau".ACTA PETROLOGICA SINICA 25.12(2009):3259-3274.