Geological and geochemical characteristics of early Tertiary basaltic;rocks in center Jiangxi province, Southeast China and their geological;implication.

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	Geological and geochemical characteristics of early Tertiary basaltic;rocks in center Jiangxi province, Southeast China and their geological;implication.
	Xie, GQ 5; Mao, JW ; Hu, RZ ; Li, RL ; Cao, JJ
刊名	ACTA PETROLOGICA SINICA
	2005
卷号	21 期号:1 页码:77-90
关键词	basaltic rock geochemistry geodynamics implication early Tertiary Jiangxi
ISSN号	1000-0569
英文摘要	Geological and geochemical characteristics of Paleocene basaltic rocks in center Jiangxi province, Southeast China is systematically researched in this article, aiming to discuss genesis of those and their geodynamics implication. Plenty of basaltic rocks occurred dikes and stock as Jian-Taihe later Cretaceous basin. On the basic of field characteristics and K-Ar dating (49 similar to 65 Ma, Paleocene) for them, the basaltic rocks were formed during early Tertiary. The trace element and rare earth element chemistry of the basaltic rocks are characterized by enrichment of large ion element, moderate enrichment high field strength element and light rare earth element, and all samples do not display significantly Nb and Ta negative anomalies and are similar to within-plate basalts. The initial Sr-87/Sr-16 compositions of the basaltic rocks are low, ranging from 0.7041 similar to 0.7064, and initial Nd-143/Nd-144 of them are high with epsilon(Nd) (T) = +0.8 similar to +6.2. Combining geological and geochemical characteristics with regional geological history, the Paleocene basaltic rock studied are related to asthenospheric mantle uplift and lithospheric extension, and were generated by partial melting and mixing of different proportions of depleted asthenospheric mantle and EM II-type lithospheric mantle and had undergone different degree of fractional crystallization en rote to the surface. All features indicate that southeast China was dominated by lithosphere uplift and extension rather than related to pacific plate subduction during the Paleoeene time. The occurrence of Paleocene basaltic rock are geochemical distinct from the Cretaceous magmas, similar to Cenozoic basalts, indicting tectonics setting of southeast China change from continental are to intra-plate regime, and this significant change result from lithosphere extension and asthenosphere upwelling.
学科主题	火成岩岩石学
WOS关键词	SE CHINA ; CENOZOIC BASALTS ; TRACE-ELEMENT ; EASTERN CHINA ; CONTINENTAL-CRUST ; TECTONIC SIGNIFICANCE ; CHEMICAL-COMPOSITION ; REGIONAL ; VARIATIONS ; MANTLE SOURCES ; PB ISOTOPE
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000227476000008
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37913]
专题	中国地质调查局发展研究中心
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China. 2.Chinese Acad Sci, Inst Geochem, Guiyang 550002, Peoples R China. 3.China Univ Geosci, Fac Earth Sci, Beijing 100083, Peoples R China. 4.Sun Yat Sen Univ, Earth Sci Dept, Guangzhou 510275, Peoples R China. 5.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Xie, GQ,Mao, JW,Hu, RZ,et al. Geological and geochemical characteristics of early Tertiary basaltic;rocks in center Jiangxi province, Southeast China and their geological;implication.[J]. ACTA PETROLOGICA SINICA,2005,21(1):77-90.
APA	Xie, GQ,Mao, JW,Hu, RZ,Li, RL,&Cao, JJ.(2005).Geological and geochemical characteristics of early Tertiary basaltic;rocks in center Jiangxi province, Southeast China and their geological;implication..ACTA PETROLOGICA SINICA,21(1),77-90.
MLA	Xie, GQ,et al."Geological and geochemical characteristics of early Tertiary basaltic;rocks in center Jiangxi province, Southeast China and their geological;implication.".ACTA PETROLOGICA SINICA 21.1(2005):77-90.