Geochemical characteristics and petrogenesis of two types of acid volcanic rocks from Yingcheng Formation in Songliao Basin

	Geochemical characteristics and petrogenesis of two types of acid volcanic rocks from Yingcheng Formation in Songliao Basin
	Meng FanChao 1; Lu YuLin 2; Liu JiaQi 3; Cui Yan 4
刊名	ACTA PETROLOGICA SINICA
	2013-08-01
卷号	29 期号:8 页码:2731-2745
关键词	Songliao Basin Yingcheng Formation Acid volcanic rocks Petrogenesis
ISSN号	1000-0569
文献子类	Article
英文摘要	The thick volcanic rocks are widely distributed in Yingcheng Formation of Songliao Basin. Core and thin section identification exhibit that volcanic rocks are mainly composed of rhyolite, dacite, rhyolitic tuff, ignimbrite and so on. Major, trace elements and isotopic geochemistry studies indicate that acid rocks are obviously classified as two types: high Ti acid volcanic rocks (HTAVR) and low Ti acid volcanic rocks (LTAVR). Many conclusions can be draw from the results of geochemical elements: (1) HTAVR have higher TiO2 (TiO2>0.45%) but lower SiO2(64.87%similar to 68.79%). LTAVR have lower TiO2 (TiO2<0.4%) but higher SiO2(68.93%similar to 76.69%). (2) Major and trace elements express continuous variation between HTAVR and sub-alkaline intermediate-basic rocks. They also have similar Sr-Nd isotopic elements. LTAVR are the main components in Yingcheng Formation with wide initial 87Sr/86Sr ratios. (3) The two types of acid rocks were probably associated with the lithospheric thinning and asthenospheric mantle upwelling by subduction of the Pacific plate beneath eastern China. However, there are many different geochemical characteristics between the two types of acid rocks because of different magmas source, geochemistry process and crustal contamination. The magmas of HTAVR were generated partial melting of the depleted mantle which has been enriched but undergoing fractional crystallization. The generation of LTAVR origined from mixed melting of juvenile crust and low crust components with contaminated by supracrust.
WOS关键词	PHANEROZOIC CRUSTAL GROWTH ; QINGSHEN GAS-FIELD ; A-TYPE GRANITES ; ND ISOTOPIC EVIDENCE ; NE CHINA ; NORTHEASTERN CHINA ; CHEMICAL CLASSIFICATION ; TECTONIC IMPLICATIONS ; ANTARCTIC PENINSULA ; HINGGAN MOUNTAINS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000323689100010
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88054]
专题	中国科学院地质与地球物理研究所
通讯作者	Meng FanChao
作者单位	1.China Univ Petr, Sch Geosci, Qingdao 266580, Peoples R China 2.China Geol Survey, Res Dev Ctr, Beijing 100037, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 4.China Univ Petr, Shengli Coll, Dongying 257097, Peoples R China
推荐引用方式 GB/T 7714	Meng FanChao,Lu YuLin,Liu JiaQi,et al. Geochemical characteristics and petrogenesis of two types of acid volcanic rocks from Yingcheng Formation in Songliao Basin[J]. ACTA PETROLOGICA SINICA,2013,29(8):2731-2745.
APA	Meng FanChao,Lu YuLin,Liu JiaQi,&Cui Yan.(2013).Geochemical characteristics and petrogenesis of two types of acid volcanic rocks from Yingcheng Formation in Songliao Basin.ACTA PETROLOGICA SINICA,29(8),2731-2745.
MLA	Meng FanChao,et al."Geochemical characteristics and petrogenesis of two types of acid volcanic rocks from Yingcheng Formation in Songliao Basin".ACTA PETROLOGICA SINICA 29.8(2013):2731-2745.