Purevjav Narantuya (Mongolia)

Email: s099707 @matsu.shimane-u.ac.jp

Thesis title:  Geochemistry of Devonian and Carboniferous sedimentary rocks in the Sudut area, Uvurkhangai province, Mongolia.

Supervisor:  Assoc. Prof. Barry P. Roser (2009-2012).

The Sudut area is situated in the Hangai – Hentey basin of Mongolia. My study area consists of Devonian and Carboniferous siltstones and sandstones of the Erdenetsogt Formation, conglomerates and claystones of the Jargalant Formation, and sandstones and claystones of the Tsetserleg Formation. The original tectonic environment of the Hangai – Hentey basin is controversial, with proposals in the literature including accretionary wedge, oceanic basin, active continental margin, or post-orogenic successor basin settings (Badarch et al. (2002).

Sedimentary geochemistry has seldom been used in Mongolia to reconstruct the depositional history of sedimentary terranes. In this study, I will apply established petrographic and sedimentary geochemistry methods to identify the provenance, weathering history and tectonic setting of the basement sedimentary rocks. Comprehensive petrographic and geochemical data will provide information on the effect of provenance, weathering, tectonic setting, transportation, hydraulic sorting, and climate on the composition of the Sudut sediments. Similar techniques could be applied elsewhere in Mongolia.

I will also extend work from my M.Sc. on quartz veins in the Sudut area and their relationship to newly-discovered plutonic rocks in the district. This may help constrain the origin and source of gold-bearing placer deposits in the area.