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2023 Vol. 46, No. 1
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HU Peng, ZENG Wei, DUAN Ming, WANG Jia-ying. 2023. Research on tectonic setting of Mesozoic granitoids in the Wuyuan county area, northeastern Jiangxi province. North China Geology, 46(1): 33-41. doi: 10.19948/j.12-1471/P.2023.01.04
Citation: HU Peng, ZENG Wei, DUAN Ming, WANG Jia-ying. 2023. Research on tectonic setting of Mesozoic granitoids in the Wuyuan county area, northeastern Jiangxi province. North China Geology, 46(1): 33-41. doi: 10.19948/j.12-1471/P.2023.01.04
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Research on tectonic setting of Mesozoic granitoids in the Wuyuan county area, northeastern Jiangxi province

  • 1. Tianjin Center, China Geological Survey, Tianjin 300170, China;

  • 2. North China Center of Geoscience Innovation, China Geological Survey, Tianjin 300170, China

Received Date:  20 December 2021
    Abstract
  • The Bangyankeng, Duanxin and Qingshanling granitic plutons intrude in the eastern part of Jiangnan orogenic belt.The Bangyankeng pluton shows high SiO2 content(65.56%~71.36%), rich in aluminum(Al2O3=14.12%~16.58%), and poor in MgO(1.08 to 1.33).It is also rich in potassium(3.42%~4.56%), and weak negative Eu anomaly(δEu=0.65~0.92), (La/Yb)N has a higher value of 13.92~19.09.As the content characteristic element, Y is with a low value of 13.8 ×10-6~17.9×10-6.Sr is of 335.9×10-6~484×10-6, with the significant negative anomalies of Nb and Ti.Various characteristics indicate that Bangyankeng granite belongs to C-type adakites with the partial melting of mafic crust formation.The DuanXin and Qingshanling granites are rich in Si, K, poor in Ca, Mg and peraluminous characteristics.The LREE and HREE exhibit moderate right orientation, strong negative anomalies of Eu.It shows classic right-slope"V" shape.The incompatible elements Rb, Th, Ta are high, and Zris slight loss.Ba, Sr, Eu show strong negative anomaly, together with Ga/ Al=3.12~3.44.The geochemistry indicates that DuanXin and Qingshanling rock belong to A2-type granite, as the product of postorogenic extensional.The crust in northeast of Jiangxi was thickened after the Indosinian orogeny and then suffer the regional tectonic stress shifts during the Late Jurassic to Early Cretaceous.The compression under the tectonic thickening transfers to the post-orogenic extension.
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