2020 Vol. 47, No. 3
Article Contents

LIU Lang, LIU Demin, SHAO Junqi, DING Guoli, HUANG Binbin, HUANG Jinshan. 2020. Geochronology, geochemistry and tectonic evolution of the basaltic trachyandesite in Huize, northeastern Yunnan Province[J]. Geology in China, 47(3): 678-692. doi: 10.12029/gc20200309
Citation: LIU Lang, LIU Demin, SHAO Junqi, DING Guoli, HUANG Binbin, HUANG Jinshan. 2020. Geochronology, geochemistry and tectonic evolution of the basaltic trachyandesite in Huize, northeastern Yunnan Province[J]. Geology in China, 47(3): 678-692. doi: 10.12029/gc20200309

Geochronology, geochemistry and tectonic evolution of the basaltic trachyandesite in Huize, northeastern Yunnan Province

    Fund Project: Supported by Hot Dry Rock Resources Survey Projects of Guangxi, China (No. 2019016207), Geological Survey Projects of China Geological Survey (No. 12120115041601), Deformation Characteristics and Structural Evolution of Xiaomiluo Fold in Huize County, Yunnan Province (No. 2015014062)
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  • Author Bio: LIU Lang, male, born in 1992, master, majors in structural geology, engages in research on tectonics; E-mail:237295093@qq.com
  • Corresponding author: LIU Demin, male, born in 1975, associate professor, majors in structural geology, mainly engages in the study of geodynamics of continent and geothermal geology; E-mail:1517953652@qq.com 
  • Several small-scale basalt trachyandesite rock masses were found in NNE direction in Emeishan basalts of Huize area, northeastern Yunnan Province. Based on detailed field geological survey, microscopic petrographic analysis, zircon U-Pb dating and rock geochemical test, the authors studied the formation age and geochemical characteristics of these basalt trachyandesites and their tectonic evolution process. LA-ICP-MS zircon U-Pb dating yielded a weighted mean 206Pb/238U age of(251.6±4.2)Ma (MSWD=0.20) for the basalt trachyandesite, and the alteration ages are(143.5±1.9) Ma and(150.5±2.4) Ma, respectively. The content of SiO2 in basalt trachyandesite is between 52.09%-54.10%, implying that it belongs to the intermediate basic volcanic rock. The Mg# values of basalt trachyandesite are from 19.88 to 40.86, and the TAS diagram generally shows that it belongs to alkali basalt trachyandesite series. The characteristics of REE and trace elements show that the basalt trachyandesite of Huize was derived from enriched mantle source. In the process of magmatic evolution, a part of clinopyroxene, plagioclase and magnetite experienced fractional crystallization. It is considered that the basalt trachyandesite of Huize is a part of Emeishan basalts, and that it might have been the product of the extinction of Emeishan mantle plume.

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