Geochronology and geochemistry of Early Mesozoic acid volcanic rocks from Southwest Guangxi Constraints on tectonic evolution of the southwestern segment of Qinzhou-Hangzhou joint belt

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	Geochronology and geochemistry of Early Mesozoic acid volcanic rocks from Southwest Guangxi Constraints on tectonic evolution of the southwestern segment of Qinzhou-Hangzhou joint belt
	Qin, XF (Qin XiaoFeng); Wang, ZQ (Wang ZongQi); Zhang, YL (Zhang YingLi); Pan, LZ (Pan LuoZhong); Hu, GA (Hu GuiAng); Zhou, FS (Zhou FuSheng)
刊名	ACTA PETROLOGICA SINICA
	2011
卷号	27 期号:3 页码:794-808
关键词	Early Mesozoic acid volcanic rocks Chronology Geochemistry Tectonic evolution Southwest Guangxi Southwestern segment of Qinzhou-Hangzhou joint belt
ISSN号	1000-0569
英文摘要	Early Mesozoic acid volcanic rocks are exposed dominantly in the southwestern segment of Qinzhou-Hangzhou joint belt, and are mainly distributed in both sides of the Shiwandashan Mesozoic-Cenozoic basin. The volcanic rocks of Lower and Middle Triassic Beisi Formation are exposed in northwest side of the basin, which consists of alternating volcanic succession of felsic lavas (basaltic andesite-dacite-rhyolite) interlayered with pyroclastic rocks (dominantly agglomerate lava, breccia lava, tuffolava, breccia ignimbrites, ignimbrites) and a dacite sample yielded a zircon SHRIMP U-Pb concordia age of 246 +/- 2Ma. The volcanic rocks of Triassic Banba Formation are exposed in southeast side of the basin, which composed mainly of rhyolite interlayered perlite, tuffolava, agglomerate lava and rhyolite tuff and a rhyolite sample yielded a zircon SHRIMP U-Pb concordia age of 250 +/- 2Ma. Major- and trace-elements as well as Sr-Nd isotope geochemistry researches show; The volcanic rock association belongs to a typical peraluminous high-K calc-alkaline series and are characterized by relative enrichment in LILEs (e. g., K, U, Ba, Rb and Th) and LREEs and pronounced depletion in HFSEs (e. g., Nb, Ta, P and Ti) and HREEs. They also have relatively high ((87)Sr/(86)Sr) (i) (0. 713929 similar to 0. 722178) and low epsilon(Nd) (t) (-10. 33 similar to -9. 02). Such signatures display geochemical characteristics of typical subduction-related arc volcanic rocks. Together with early Paleozoic MORB-type metabasic volcanic rocks and Permian E-MORB type basalts were formed in an back-arc spreading center setting in the region, appears to support a development of a Paleozoic oceanic basin within the southwestern segment of the joint belt between the Yangtze and Cathaysian blocks (so-called Qinzhou-Hangzhou joint belt), which suggests that the oceanic basin had not been closed until the Indosinian orogeny at middle Triassic resulted in the final collision between the Yangtze and Cathaysian blocks.
学科主题	火成岩岩石学
WOS关键词	OCEAN ISLAND BASALTS ; TRACE-ELEMENT ; ISOTOPIC CONSTRAINTS ; CONTINENTAL-CRUST ; MANTLE WEDGE ; CHINA ; COLLISION ; ORIGIN ; ND ; DIFFERENTIATION
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000289926600018
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39290]
专题	中国地质调查局
作者单位	Guangxi Inst Reg Geol Survey, Guilin 541003, Peoples R China
推荐引用方式 GB/T 7714	Qin, XF ,Wang, ZQ ,Zhang, YL ,et al. Geochronology and geochemistry of Early Mesozoic acid volcanic rocks from Southwest Guangxi Constraints on tectonic evolution of the southwestern segment of Qinzhou-Hangzhou joint belt[J]. ACTA PETROLOGICA SINICA,2011,27(3):794-808.
APA	Qin, XF ,Wang, ZQ ,Zhang, YL ,Pan, LZ ,Hu, GA ,&Zhou, FS .(2011).Geochronology and geochemistry of Early Mesozoic acid volcanic rocks from Southwest Guangxi Constraints on tectonic evolution of the southwestern segment of Qinzhou-Hangzhou joint belt.ACTA PETROLOGICA SINICA,27(3),794-808.
MLA	Qin, XF ,et al."Geochronology and geochemistry of Early Mesozoic acid volcanic rocks from Southwest Guangxi Constraints on tectonic evolution of the southwestern segment of Qinzhou-Hangzhou joint belt".ACTA PETROLOGICA SINICA 27.3(2011):794-808.