Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (1): 129-138.doi: 10.13278/j.cnki.jjuese.20190080

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Geochronology and Geochemistry of Volcanic Rocks in Tamulangou Formation from New Barag Right Banner, Inner Mongolia

Zhang Shuyi   

  1. No. 240 Institute of Nuclear Industry, Shenyang 110032, China
  • Received:2019-04-11 Published:2020-02-11
  • Supported by:
    Supported by Project of China Geological Survey(1212011120677,1212011220421)

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Abstract: The volcanic rocks of Tamulangou Formation in New Barag Right Banner are mainly composed of basalt, basaltic andesite,and andesite. TIMS zircon U-Pb dating result shows that the volcanic rocks were formed in the Late Jurassic (ca. 154 Ma). The geochemical data show that the volcanic rocks belong to alkaline series, and have low contents of MgO (w(MgO)=0.55%-3.36%) and small amount of Mg# (0.17-0.49); the chondrite-normalized rare earth element (REE) patterns indicate that the volcanic rocks are enriched in light rare earth elements (LREE) with significant fractionation of HREE from LREE ((La/Yb)N=9.51-17.21) and insignificant Eu anomalies (δEu=0.78-1.04); the trace element geochemistry is characterized by enrichment of large ionic lithophile elements (e.g. Rb, Ba, K) and LREEs, depletion of high field strength elements (e.g., Nb, Ta, Ti),and compatible elements (Cr, Co, Ni). These characteristics suggest that the magma may be derived from partial melting of lithosphere mantle and metasomatized by subduction related fluids. Combined with the regional research results, we suggest that the volcanic rocks were formed under a lithospheric extension after the closure of the Mongol-Okhotsk Ocean.

Key words: Tamulangou Formation, volcanic rock, geochronology, geochemistry, petrogenesis, New Barag Right Banner

CLC Number: 

  • P588.1
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