Geochemical Characteristics and Genesis Analysis of Deju Basalt in Midu County, Western Yunnan

Abstract

Deju basalts is a characteristic volcanic association and was first founded in the 1 : 50 000 regional geological survey. There is no previous study. The basalts’ characteristics and genesis are systematically studied from the geochemistry. It is showed that the basalts’s w(SiO2) = 50.61‒54.54%, w(K2O + Na2O) = 0.15‒5.96%, w(P2O5) = 0.18‒0.45%, w(TiO2) = 1.82‒3.58%, belong to sub alkaline basalt series. Chondrite-normalized REE patterns indicate the basalts are relatively rich in LREE but deficient in HREE (LREE/HREE = 5.81‒6.51), and have a similar mantle source with WPB and OIB. The mantle source have a characteristics of GP. The discrimination diagrams of basalt tectonic setting reflect the basalts in Deju belongs to continental intraplate basalt, formed in a continental rift stretching environment, and during the diagenesis process, the magma source was contaminated by the crust and oceanic crust subducted materials.

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Correspondence to Zhao Ya-Nan.

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Ya-Nan, Z., Qian-Ru, X., Hong-Xiao, L. et al. Geochemical Characteristics and Genesis Analysis of Deju Basalt in Midu County, Western Yunnan. Dokl. Earth Sc. 495, 888–893 (2020). https://doi.org/10.1134/S1028334X20120144

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Keywords:

  • geochemistry
  • petrogenes genesis
  • Permian basalts
  • Midu County