J4 ›› 2009, Vol. 39 ›› Issue (5): 828-838.

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Characteristics of Plume-Related A-Type Granites: An Example from the Emeishan Large Igneous Province

ZHONG Yu-ting1|2|XU Yi-gang1   

  1. 1.Guangzhou Institute of Geochemistry/Key Laboratory of Isotope Geochronology and Geochemistry, |Chinese Academy of Sciences, Guangzhou 510640,China;2.Graduate University, Chinese Academy of Sciences|Beijing 100049,China
  • Received:2009-05-27 Online:2009-09-26 Published:2009-09-26

Abstract:

Comparison of petrologic and geochemical characteristics of plumerelated (Panxi area) and non plumerelated (South China, Central Asian Orogenic Belt) A-type granites have been carried out in this study. It is shown that the plume-related A-type granites are characterized by (1) the close temporal and spatial association with maficultramafic rocks; (2) high zircon saturation temperature (860-960℃); (3) high Nb/Th and Ga/Al ratios, and (4) positive εNd（t） (but usually <5) and no significant difference between Nd model age and the formation age of the rocks. All these characteristics, largely relevant to the nature of the plume-generated magma source and/or parental magmas, and magmatic evolution, can be used to identify similar rock types in natural occurrence.

Key words: A-type granite, mantle plume, Emeishan large igneous province, juvenile crust

CLC Number: 

  • P588.1
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