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SONG Yunhong, YANG Fengchao, HAO Libo, YAN Guolei, ZHAO Dongfang, ZHANG Zhehuan. SHRIMP U-Pb age, geochemical characteristics and its introcontinental extension of Fenghuangshan syenogranite in the east Liaoning[J]. GEOLOGY IN CHINA, 2022, 49(5): 1687-1698. DOI: 10.12029/gc20220521
Citation: SONG Yunhong, YANG Fengchao, HAO Libo, YAN Guolei, ZHAO Dongfang, ZHANG Zhehuan. SHRIMP U-Pb age, geochemical characteristics and its introcontinental extension of Fenghuangshan syenogranite in the east Liaoning[J]. GEOLOGY IN CHINA, 2022, 49(5): 1687-1698. DOI: 10.12029/gc20220521
shu

SHRIMP U-Pb age, geochemical characteristics and its introcontinental extension of Fenghuangshan syenogranite in the east Liaoning

  • 1.

    Shenyang Center of China Geological Survey, Shenyang 110034, Liaoning, China

  • 2.

    College of GeoExploration Science and Technology, Jilin University, Changchun 130026, Jilin, China

Funds: 

the project of China Geological Survey DD20221779

the project of China Geological Survey DD20190520

More Information
  • Author Bio:

    SONG Yunhong, female, born in 1983, senior engineer, mainly engaged in geochemical investigation and research work; E-mail: yunhong408@163.com

  • Received Date: September 19, 2019
  • Revised Date: September 16, 2022
  • Available Online: September 25, 2023
    Graphical Abstract
    • Abstract

  • This paper is the result of the geological survey engineering.

    Objective 

    Aperiod of A-type granite is developed in Dandong, Liaoning Province, which has been widely concerned because of its special genetic evolution, specific tectonic setting and important geodynamic significance.

    Methods 

    In this paper, the SHRIMP zircon U-Pb chronology and petrogeochemical characteristics of the Fenghuangshan pluton in Dandong, Liaoning Province, were analyzed to explore the formation age, petrogenesis and geodynamic background of the pluton.

    Results 

    The zircon U-Pb ages of the biotite syenogranite in Fenghuangshan, Liaodong are (122.3±1.7) Ma, (125.0±1.7) Ma and (122±2) Ma, representing that the magma of the biotite syenogranite in Fenghuangshan crystallized and intruded in the Early Cretaceous. Geochemical analysis shows that the SiO2 content is 65.65%-73.62%, whereas that of K2O and Na2O is 3.52%-5.76% and 3.64%-4.26%, respectively. They also contain 13.4%~15.49% of Al2O3, with A/CNK ratio of 1.02-1.46, indicative of their peraluminous nature. The alkalinity rate (AR) ranges from 2.71 to 5.13, and this range is within the AR of aluminous A-type granites. Its FeOt/MgO ranges from 4.69 to 18.05, which shows the A1 and A2 transition types of A-type granites. The Rb/Nb ranges from 6.02 to 8.64, which display a higher level than that of the continental crust of 2.2-4.7. This implies that continental crust components, which lead to an increase in Rb content, had a significant influence on its formation. The biotite syenogranites are relatively enriched in large ion lithophileelements Rb, Th, Zr, Hf, and depleted in Sr, P, Ba, Ti, Nb. The total content of rare earth elements is high, the fractionation between light and heavy rare earth elements is not obvious, and Eu has obvious negative anomalies.

    Conclusions 

    In summary, Fenghuangshan pluton might have been produced in stretching environment related to intracontinental shearing, which ought to be a response to the tectonization of the East Asia continental margins caused by the subduction of plates starting from the Middle Jurassic.

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    • References (60)
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