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Chronology, geochemistry and tectonic significances of the Cenozoic Zougouyouchacuo and Nadingcuo volcanic rocks in northern Tibetan Plateau
Alternative TitleChronology, geochemistry and tectonic significances of the Cenozoic Zougouyouchacuo and Nadingcuo volcanic rocks in northern Tibetan Plateau
Liu JianFeng1; Chi XiaoGuo1; Zhao XiuYu1; Zhao Zhi1; Dong ChunYan2; Li GuangRong3; Zhao YuanDong4
2009
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume25Issue:12Pages:3259-3274
AbstractThis 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.
KeywordMC-ICP-MS MANTLE SOURCE QIANGTANG PETROGENESIS ALKALINE CONSTRAINTS EVOLUTION HF Tibetan Plateau Cenozoic volcanic rocks Adakite Geochemistry South Qiangtang area
Indexed ByCSCD
Language英语
CSCD IDCSCD:3801826
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/151837
Collection中国科学院金属研究所
Affiliation1.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
Recommended Citation
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.
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