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Chinese Journal of Geochemistry

, Volume 23, Issue 2, pp 124–134 | Cite as

Geochemical characteristics and implications of eclogite gravels from Mesozoic strata at the northern margin of Dabie orogenic belt

  • Li Shuangying 
  • Yue Shucang 
  • Wang Daoxuan 
  • Liu Yin 
  • Li Renwei 
  • Meng Qingren 
  • Jin Fuquan 
Article

Abstract

The eclogite gravels, which were found in the Mesozoic Fenghuangtai and Maotanchang formations on the northern margin of the Dabie orogenic belt, are rich in K2O (1.21%), ΣREE (278µg/g), and LILE (such as Rb, Ba, K, Th, etc.), with high (La/Yb)N ratios (14.4), on the basis of the analyses of major elements, rare-earth elements (REE) and trace elements. Their enrichment in LILE, notable Nb-Ta depletion through, and depletion in HFSE relative to REE in comparison with the primitive mantle and N-MORB indicate that the protoliths of the eclogite gravels were formed in an island-arc setting. According to the Th-Hf-Ta discrimination diagram, the protoliths of the eclogite gravels are characterized by volcanic arc basalts. Trace element data indicate that the subducted marine sediments were assimilated in the magma chamber, resulting in the enrichment of LILE in the protoliths. Therefore, the protoliths of the eclogite gravels are considered to have been formed in an inland-arc setting, indicating that there had developed a paleo-inland arc before Triassic collision between the North and South China blocks in the Dabie orogenic belt. There is a marked difference between the eclogite gravels and the eclogites developed along the Dabie orogenic belt, solely based on their geochemical data, especially REE. Therefore, the eclogite gravels may not be derived from eclogite terrains preserved in the Dabie orogenic belt.

Key words

eclogite gravel geochemistry Nb-Ta depletion through protolith paleo-island arc Dabie orogenic belt 

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Copyright information

© Science Press 2000

Authors and Affiliations

  • Li Shuangying 
    • 1
  • Yue Shucang 
    • 1
  • Wang Daoxuan 
    • 1
  • Liu Yin 
    • 1
  • Li Renwei 
    • 1
  • Meng Qingren 
    • 2
  • Jin Fuquan 
    • 1
  1. 1.College of Natural Resources and Environmental ScienceHefei University of TechnologyHefeiChina
  2. 2.Institute of Geology and GeophysicsChinese Academy of SciencesBeijingChina

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