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学科主题: Geosciences, Multidisciplinary
题名: Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan, China
作者: Jia, DC ; Hu, RZ ; Lu, Y ; Xie, GQ ; Qiu, XL
通讯作者: jiadacheng@sina.com
关键词: sodium lamprophyre ; mantle source region ; tectonic setting ; genesis ; northeastern Hunan
刊名: SCIENCE IN CHINA SERIES D-EARTH SCIENCES
发表日期: 2004
卷: 47, 期:6, 页:559-569
收录类别: sci
部门归属: Chinese Acad Sci, Inst Geochem, Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China; Jilin Univ, Coll Geoexplorat Sci & Technol, Changchun 130026, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510301, Peoples R China
项目归属: 海洋地质
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.
原文出处: 查看原文
WOS记录号: WOS:000223147200010
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4796
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Jia, DC; Hu, RZ; Lu, Y; Xie, GQ; Qiu, XL.Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan, China,SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2004,47(6):559-569
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