Geological Summary

This volcanic area is described by Hoang et al. (2015) as follows: "The Nghia Dan volcanic plateau comprises a number of monogenetic volcanoes, forming a lava cover with thickness ranging from several meters to more than 200 m. The volcanoes include Nui Tien (Nghia Son village), Nui Hang (Nghia Lam), Doi Tro and Doi Troc (Nghia My) and Nui Ro (Xuan Binh). The basalts are both massive and porous, but porous lava type is dominant. The massive type sometimes occurs as 4-to-5 sided columnar lavas (KeLui, Nghia Lam)." This area was listed on the IAVCEI Post-Miocene data sheets, which indicated two adjacent areas with basaltic cones in this general location, one with three and the other with four volcanoes. A geological map (Fromagel, 1971) showed six small areas of basalt outcrops, and satellite imagery shows no cones. Hoang et al. (2015) further noted that there was an "Ar-Ar age of 5.9 Ma (C.T. Chi et al., 1998) for a sample collected in the Nghia My village area; and another was dated to 4.2 Ma (Lee et al., 1998)."

References

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

Hoang N, Ogasawara M, Huong T T, Hung P V, Thu N T, Thang C S, Dang P T, Xuan P T, 2015. Geochemistry of Neogene Basalts in the Nghia Dan district, western Nghe An. Vietnam Journal of Earth Sciences, 36(4), 403–412. https://doi.org/10.15625/0866-7187/36/4/6428

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome, International Association of Volcanology and Chemistry of the Earth's Interior.