峨眉山玄武岩Sr、Nd、Pb同位素特征及其物源探讨

张招崇; 王福生

Volume 28 Issue 4

Jul. 2003

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ZHANG Zhao-chong, WANG Fu-sheng, 2003. Sr, Nd and Pb Isotopic Characteristics of Emeishan Basalt Province and Discussion on Their Source Region. Earth Science, 28(4): 431-439.

Citation:

ZHANG Zhao-chong, WANG Fu-sheng, 2003. Sr, Nd and Pb Isotopic Characteristics of Emeishan Basalt Province and Discussion on Their Source Region. Earth Science, 28(4): 431-439.

ZHANG Zhao-chong, WANG Fu-sheng, 2003. Sr, Nd and Pb Isotopic Characteristics of Emeishan Basalt Province and Discussion on Their Source Region. Earth Science, 28(4): 431-439.

Citation:

ZHANG Zhao-chong, WANG Fu-sheng, 2003. Sr, Nd and Pb Isotopic Characteristics of Emeishan Basalt Province and Discussion on Their Source Region. Earth Science, 28(4): 431-439.

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Sr, Nd and Pb Isotopic Characteristics of Emeishan Basalt Province and Discussion on Their Source Region

Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2003-02-22
Publish Date: 2003-07-25

Abstract

Abstract

Two most completely outcropped geological sections, Dadili of Yongsheng County and Shangcang of Binchuan County, Yunnan Province, are chosen for Sr, Nd and Pb isotopic geochemical study. Minor samples have the same Pb isotopic composition as C component defined by Hanan & Graham, whereas most of the samples are without C component, suggesting lithospheric materials besides mantle plume. On the diagram of Sr-Nd-Pb, they are plotted within three endmembers, EMⅠ, EMⅡ and DMM. This can be easily explained by different degrees mixing of mantle plume, enriched lithospheric mantle and crustal components. These data, in combination with previous trace element data, indicate that the crustal components are chiefly from lower crust. Basaltic magmas erupted during the early stages of volcanism are susceptible to more crustal contaminations as they establish pathways to the surface. The fertile lithospheric mantle may be related to metasomatism of small melt fractions enriched in Na and P, but poor in K released from mantle plume. Trachyte has the same isotopic compositions as the basalts, implying that it is generated by fractional crystallization.
- continental flood basalt,
- Sr,
- Nd and Pb isotopes,
- source region,
- mantle plume

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References(68)

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