Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan, China

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan, China
	Jia, DC ; Hu, RZ ; Lu, Y ; Xie, GQ ; Qiu, XL
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2004
卷号	47 期号:6 页码:559-569
关键词	sodium lamprophyre mantle source region tectonic setting genesis northeastern Hunan
ISSN号	1006-9313
通讯作者	jiadacheng@sina.com
中文摘要	A set of unique sodium lamprophyres is developed in the Cenozoic intracontinental extensional zone of northeastern Hunan. These lamprophyres are significantly different in major and trace elements and Sr, Nd isotopes from ordinary potassic lamprophyres. The rocks are characterized as being enriched in Na2O and high in TiO2 and weakly enriched in Nb, Ta, Nd and LREE with no negative Eu anomaly. The trace elements and Sr, Nd isotopic compositions are typical of the mantle source region of oceanic island basalts (OIB). The average initial Sr-87/Sr-86 ratio is 0.705332, and the average initial Nd-143/Nd-144 ratio is 0.512650, with epsilon(Nd)(t) being +3.5- +3.9, marking a mantle source region of unique sodium lamprophyres. The lamprophyres were formed by metasomatism of the primitive mantle at the bottom of lithosphere by volatile-containing fluids/melts from the asthenosphere. The measured Rb-Sr isochron age of sodium lamprophyre is 136.61 Ma, representing a period in which the tectonic setting changed from compressive to extensional. Sodium lamprophyres were formed in a mantle plume tectonic setting characterized by mantle upwelling from the asthenosphere within the continent. Asthenospheric mantle upwelling is the principal geodynamic factor leading to the formation of sodium lamprophyres and constraining the Yanshanian intracontinental extensional activity in northeastern Hunan, China.
学科主题	Geosciences, Multidisciplinary
收录类别	SCI
原文出处	SCIENCE CHINA PRESS
WOS记录号	WOS:000223147200010
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/4796]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	Jia, DC,Hu, RZ,Lu, Y,et al. Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan, China[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2004,47(6):559-569.
APA	Jia, DC,Hu, RZ,Lu, Y,Xie, GQ,&Qiu, XL.(2004).Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan, China.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,47(6),559-569.
MLA	Jia, DC,et al."Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan, China".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 47.6(2004):559-569.