Email: chinbat0905 @yahoo.com
In late Triassic to early Jurassic time, numerous metallogenic belts formed in Asia as result of granitoid generation during collision and the final closure of the Mongol-Okhotsk Ocean. This led to formation of the Mongol-Transbaikalia arc in North and Central Asia (Dril et al., 2004). This includes my study area, the North Khentei metallogenic belt, which is located in the central part of northern Mongolia (Fig. 1). The North Khentei belt constitutes a gold belt that contains many placer and lode gold deposits, along with other metallic occurrences.
Previous investigations and the tectonic-geological environment suggest epithermal, orogenic, and intrusion- related gold systems and porphyry type copper- gold deposits occur in the North Khentei gold belt. The presence of orogenic gold and intrusion-related gold system is thus probable, and the potential for discovery of new deposits in this area is high. Consequently, my study is focused on the four main deposits that have already been identified in this region, namely the Boroo (Au), Gatsuurt (Au), Ulaanbulag (Au) and Khadat (Cu, Au) deposits.
The aim of my study is to define the mineral compositions and mineralization stages for each deposit, and clarify the classification of gold deposits. I will then define the genetic evolution of mineralization in the North Khentei gold belt, and provide a model for the gold genesis and primary mineralization.
The Paleozoic and Mesozoic orogens of Northeast and Central Asia contain a number of economically significant ore deposits. I hope my study will significantly improve our understanding of the gold mineralization, its genesis, and the general features of gold systems in this paleo-collision zone. A refined genetic model can also contribute to exploration programs, and may lead to new approaches that can be used to discover gold deposits in this area.