Өрмөгтэй формацын гарал үүслийн судалгаа

Authors

  • Ц.Оюунболд МУИС, ШУС, Геологи, Геофизикийн тэнхим
  • Л.Жаргал МУИС, ШУС, Геологи, Геофизикийн тэнхим

Keywords:

Urmugtei Formation, petrography, geochemistry, geochronology, provenance, source rock

Abstract

Early Carboniferous Urmugtei Formation is widely distributed in Kharaa terrane, Khangai-Khentii Belt and consists of marine conglomerate, sandstone and siltstone. The purpose of this study is to identify provenance of Urmugtei formation based on petrological, geochemical and geochronological studies of sandstone, collected from the formation. The sandstone of Urmugtei formation is classified into three types: lithic arkose, feldspathiclitharenite, and arkose composition. QFL discrimination diagram of the samples indicates that Urmugtei formation sandstone was derived from the transitional magmatic arc setting.

As the results of major element oxides, sandstone samples are characterized by intermediate to acidic composition (andesite to dacite) suggesting continental island arc environment. Geochronological studies show 238U/206 Pb Concordia age of 356-365 Ma, indicating that sandstone source was formed in Late Devonian to early Carboniferous time.

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References

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Published

2023-10-16

How to Cite

Ц.Оюунболд, and Л.Жаргал. 2023. “Өрмөгтэй формацын гарал үүслийн судалгаа”. Geological Issues 14 (October):72-79. https://journal.num.edu.mn/geology/article/view/6018.

Issue

Vol. 14 (2016): Геологийн асуудлууд

Section

Судалгааны өгүүллэг

License

Copyright (c) 2023 Геологийн асуудлууд

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