GEOCHRONOLOGY AND GEOCHEMISTRY OF THE ANDESITES FROM TAMULANGOU FORMATION IN BADAGUAN AREA, INNER MONGOLIA

CUI Jia-rui; HAN Zhi-bin; CHEN De-bing; LI Yan

doi:10.13686/j.cnki.dzyzy.2021.04.002

2021 Vol. 30, No. 4

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Article navigation > Geology and Resources > 2021 > 30(4): 414-424

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CUI Jia-rui, HAN Zhi-bin, CHEN De-bing, LI Yan. GEOCHRONOLOGY AND GEOCHEMISTRY OF THE ANDESITES FROM TAMULANGOU FORMATION IN BADAGUAN AREA, INNER MONGOLIA[J]. Geology and Resources, 2021, 30(4): 414-424. doi: 10.13686/j.cnki.dzyzy.2021.04.002

Citation:

CUI Jia-rui, HAN Zhi-bin, CHEN De-bing, LI Yan. GEOCHRONOLOGY AND GEOCHEMISTRY OF THE ANDESITES FROM TAMULANGOU FORMATION IN BADAGUAN AREA, INNER MONGOLIA[J]. Geology and Resources, 2021, 30(4): 414-424. doi: 10.13686/j.cnki.dzyzy.2021.04.002

GEOCHRONOLOGY AND GEOCHEMISTRY OF THE ANDESITES FROM TAMULANGOU FORMATION IN BADAGUAN AREA, INNER MONGOLIA

No. 240 Institute of CNNC, Shenyang 110032, China

Received Date: 01 March 2021

Revised Date: 24 March 2021

Publish Date: 25 August 2021

Abstract

Abstract

The paper analyzes the zircon U-Pb chronology and whole-rock geochemistry of the andesites from Tamulangou Formation in Badaguan area of northern Hailar to reveal the tectonic setting and petrogenesis of the andesites, and discusses tectonic evolution history of Mongolia-Okhotsk suture zone. The LA-ICP-MS zircon U-Pb dating results show the rocks were formed in 160.9-164.0 Ma. The lithogeochemical characteristics indicate the andesites belong to high-K calc-alkaline rock with notable fractionation of LREE and HREE, (La/Yb)_N of 9.97-26.85, and slight negative-weak positive Eu anomaly (δEu=0.71-1.11); The trace elements are characterized by enrichment of LILEs (Rb, U, Th and K), severe depletion of Sr, P and Ti, and relative depletion of Nb and Ta. The magma may be derived from the fluid-metasomatized mantle wedge and experienced obvious fractional crystallization during evolution. Combined with the regional evolution history, it is believed that the andesites in the study area were formed in the lithospheric extension environment after the closure of Mongolia-Okhotsk Ocean.
- Tamulangou Formation /
- andesite /
- Erguna block /
- Mongolia-Okhotsk Ocean /
- Inner Mongolia

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References

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