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 |
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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Distribution of basalts in the Emeishan (a, after He Bin et al., 2006; Li Hongbo et al., 2012); geological schematic map of the study area (b); section of rock mass (c)
Petrographic characteristics of basaltic trachyandesite
CL image and zircon U-Pb age of basaltic trachyandesite in Huize
Zircon U-Pb concordia age diagram of basaltic trachyandesite in Huize
SiO2- (Na2O + K2O) diagram of basaltic trachyandesite (a, after Lebas et al., 1986) and SiO2-K2O diagram of basaltic trachyandesite (b, after Hastie et al., 2007)
Chondrite-normalized REE patterns(a)and primitive mantle-normalized trace element spider diagram(b)for the basaltic trachyandesite (standard value after Winchester and Floyd, 1977)
Covariation relationship between MgO and other oxides and trace elements in Huize basaltic trachyandesite
(La / Sm)-(Sm / Yb) diagram of basaltic trachyandesite (after Mahoney et al., 1997)
Diagenetic environment diagram
Schematic diagram of basalt tectonic environment