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Petrogenesis of the Late Triassic volcanic rocks in the Southern Yidun arc, SW China: Constraints from the geochronology, geochemistry, and Sr–Nd–Pb–Hf isotopes
Cheng-Biao Leng;  Qiu-Yue Huang;  Xing-Chun Zhang;  Shou-Xu Wang;  Hong Zhong;  Rui-Zhong Hu;  Xian-Wu Bi;  Jing-Jing Zhu;  Xin-Song Wang
2014
Source PublicationLithos
Volume190–191Pages:363-382
Abstract

Studies on zircon ages, petrology, major and trace element geochemistry, and Sr–Nd–Hf–Pb isotopic geochemistry of intermediate volcanic rocks from the Southern Yidun arc, Sanjiang-Tethyan Orogenic Belt, SW China have been undertaken in this paper. They are used to discuss the petrogenesis of these rocks and to constrain the tectonic setting and evolution of the Yidun arc. These intermediate volcanic rocks were erupted at ca. 220 Ma (U–Pb zircon ages). Trachyandesite is the dominant lithology among these volcanic rocks, and is mainly composed of hornblende and plagioclase, with minor clinopyroxene and biotite. A hornblende geobarometer suggests that the stagnation of magma in the lower crust, where plagioclase crystallization was suppressed while hornblende crystallized, giving rise to high Sr/Y ratios that are one of the distinguishing features of adakites, after the primary magma originated from the lithospheric mantle wedge. Steeply right-inclined Rare Earth Element (REE) pattern combined with high La/Yb ratios suggests adakitic affinity of these volcanic rocks, implying that slab-melt from the subducting oceanic crust is a necessary component in the primary magma. Besides, trace element geochemistry and isotopic geochemistry also indicate that partial melting of pelagic sediments in the subduction zone and noticeable contamination with the lower crust were involved in the evolution of parental magma of these volcanic rocks. Based on previous work on the Northern Yidun arc and this study, we propose that the subduction was initiated in the Northern Yidun arc and extended to the southern part and that the Northern Yidun arc is an island arc while the Southern Yidun arc represents a continental arc, probably caused by the existence of the Zhongza Massif, that was invoked to be derived from Yangtze Block, as a possible basement of the Southern Yidun arc.

KeywordZircon U–pb Dating sr–nd–pb–hf Isotopes late Triassic Volcanic Rocks southern Yidun Arc sanjiang Tethyan Orogenic Belt southwest China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8713
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.ARC Centre of Excellence in Ore Deposits, School of Earth Sciences, University of Tasmania, Hobart 7001, Australia
3.Shandong Gold Group Co. Ltd., Jinan 250014, China
4.University of Chinese Academy of Sciences, Beijing 100039, China
Recommended Citation
GB/T 7714
Cheng-Biao Leng;Qiu-Yue Huang;Xing-Chun Zhang;Shou-Xu Wang;Hong Zhong;Rui-Zhong Hu;Xian-Wu Bi;Jing-Jing Zhu;Xin-Song Wang. Petrogenesis of the Late Triassic volcanic rocks in the Southern Yidun arc, SW China: Constraints from the geochronology, geochemistry, and Sr–Nd–Pb–Hf isotopes[J]. Lithos,2014,190–191:363-382.
APA Cheng-Biao Leng;Qiu-Yue Huang;Xing-Chun Zhang;Shou-Xu Wang;Hong Zhong;Rui-Zhong Hu;Xian-Wu Bi;Jing-Jing Zhu;Xin-Song Wang.(2014).Petrogenesis of the Late Triassic volcanic rocks in the Southern Yidun arc, SW China: Constraints from the geochronology, geochemistry, and Sr–Nd–Pb–Hf isotopes.Lithos,190–191,363-382.
MLA Cheng-Biao Leng;Qiu-Yue Huang;Xing-Chun Zhang;Shou-Xu Wang;Hong Zhong;Rui-Zhong Hu;Xian-Wu Bi;Jing-Jing Zhu;Xin-Song Wang."Petrogenesis of the Late Triassic volcanic rocks in the Southern Yidun arc, SW China: Constraints from the geochronology, geochemistry, and Sr–Nd–Pb–Hf isotopes".Lithos 190–191(2014):363-382.
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