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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; jiadacheng@sina.com
2004
Source PublicationSCIENCE IN CHINA SERIES D-EARTH SCIENCES
ISSN1006-9313
Volume47Issue:6Pages:559-569
AbstractA 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.
DepartmentChinese 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
KeywordSodium Lamprophyre Mantle Source Region Tectonic Setting Genesis Northeastern Hunan
Subject AreaGeosciences, Multidisciplinary
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Indexed Bysci
Funding Project海洋地质
WOS IDWOS:000223147200010
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/4796
Collection中科院边缘海地质重点实验室
Corresponding Authorjiadacheng@sina.com
Recommended Citation
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,&jiadacheng@sina.com.(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.
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