Science in China Series D

, Volume 49, Issue 1, pp 50–67 | Cite as

Geochemistry and U-Pb zircon geochronology of Late-Mesozoic lavas from Xishan, Beijing

  • Yuan Honglin 
  • Liu Xiaoming 
  • Liu Yongsheng 
  • Gao Shan 
  • Ling Wenli 
Article
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Abstract

Zircon U-Pb dating by both SHRIMP and LA-ICP-MS and geochemical study of the Tiaojishan Formation and the Donglintai Formation from Xishan, Beijing, reveal that ages of upper lavas of Tiaojishan Formation and Middle of Donglintai Formation are 137.1±4.5 Ma(2σ) and 130-134 Ma, respectively. The fomer is slightly older than the latter and the age difference between these two formations is less than 5 Ma. These lines of evidence prove that the two volcanoes erupted within a short time. The age of the Tiaojishan Formation from Xishan, Beijing is distinctively different from that of the Chende Basin. This indicated that the ages of Tiaojishan lavas varied in different regions. The Tiaojishan Formation consists of typical adakite (SiO2=56%, Na2O = 3.99-6.17, Na2O/K2O = 2.2-3.1, Sr = 680-1074×10-6, Y = 13.2-16.3×10-6, Yb = 1.13-1.52×10-6, Sr/Y = 43-66), high-Mg adakite and high-Mg andesite (Mg# = 54-55). Features of continental crust of adakite from the Tiaojishan Formation and its syngeneric middle silicic vocanic rocks, such as typical Nd-Ta negative abnormality and Pb possive abnormality, indicate that these lavas are originated from partial melts of continental crust. These results suggest that the adakite from the Tiaojishan Formation of Xishan, Beijing derived from thickened eclogitic lower crust and lithosphere beneath the North China craton at mesozoic that was foundered into the aesthenosphere, and subsequenctly partially melted and interacted with mantle olivine during melts upward migration. The age of lavas from the Tiaojishan Formation restrained the foundation which should last at least until 137 Ma. Lavas of the Donglintai Formation are rhyolith and andesite with normal Mg# and thus they did not interact with the mantle. These lavas represent remobilized melts of lower crust material caused by mantle aesthenosphere upwelling migration induced by foundation.

Keywords

adakite eclogite geochemistry North China craton lower crust foundation 
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Copyright information

© Science in China Press 2006

Authors and Affiliations

  • Yuan Honglin 
    • 1
  • Liu Xiaoming 
    • 1
  • Liu Yongsheng 
    • 2
  • Gao Shan 
    • 1
    • 2
  • Ling Wenli 
    • 2
  1. 1.Key Laboratory of Continental DynamicsNorthwest UniversityXi’anChina
  2. 2.Faculty of Earth SciencesChina University of GeosciencesWuhanChina

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