| Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan,China | |
JIA Dacheng; HU Ruizhong ; LU Yan; XIE Guiqing; QIU Xuelin
| |
| 2004 | |
| Source Publication | Science in China
 |
| Volume | 47Issue:6Pages:559-569 |
| metadata_24 | 其它 |
| Abstract | A set of unique sodium lamprophyres is devel)0.1(oped in the Cenozoic intraconti)]nental extensional zone of northeastern Hunan. These lamprophyres are significantly different in major [(and trace elements and Sr, Nd isotopes from ordinary potassic lamprophyr\ es. )0(The rocks)0( )(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 87Sr/86Sr ratio is 0.705332, and the average initial 143Nd/144Nd ratio is 0.512650, with εNd(t) being[( )45.4(+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 vola[(tile)(-)(containing )68.2(f)(l)(u-)]ids/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 set)0(ting 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 i)0(n)(tracontinental extensional activity in northeast)0(ern Hunan, China.)] |
| Keyword | Sodium Lamprophyre Mantle Source Region Tectonic Setting Genesis Northeastern Hunan |
| Subject Area | 中国典型特殊区带大规模成矿作用及其动力学 |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/3077 |
| Collection | 矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文 矿床地球化学国家重点实验室 |
| Recommended Citation GB/T 7714 | JIA Dacheng,HU Ruizhong,LU Yan,et al. Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan,China[J]. Science in China,2004,47(6):559-569. |
| APA | JIA Dacheng,HU Ruizhong,LU Yan,XIE Guiqing,&QIU Xuelin.(2004).Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan,China.Science in China,47(6),559-569. |
| MLA | JIA Dacheng,et al."Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan,China".Science in China 47.6(2004):559-569. |
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