THE PROBLEM OF FORMATION OF EOLIAN GOLD PLACERS ON THE TERRITORY OF MONGOLIA
Z.S. Nikiforova1, A.S. Borisenko2, V. L. Sukhoroslov3
1Diamond and Precious Metal Geology Institute of SB RAS, Republic of Sakha (Yakutia), Yakutsk, Russia
2 V.S. Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russia
3 Zarubezhtsvetmet JSC, Moscow, Russia
Keywords: eolian processes, relief, formation, eolian placers, distribution conditions, eolian gold, ventifacts, deflation, promising areas, Mongolia
Abstract
The influence of Aeolian processes on the formation of gold-bearing Aeolian placers has not yet been adequately taken into account in Mongolia, although there is well-reasoned evidence in favor of their formation. Based on the identification of Aeolian gold, the conclusion is substantiated that the formation of gold-bearing placers involved not only hydrodynamic, but also Aeolian processes, which were widely manifested in the Quaternary. The presence of Aeolian gold placers in the troughs and basins of the blowout suggests the formation of gold-bearing Aeolian placers. An analysis of the patterns of distribution of Aeolian gold has shown that the formation of Aeolian gold placers on the territory of Mongolia is quite possible – actually Aeolian placers and placers of heterogeneous origin. Actually, Aeolian placers (autochthonous and allochthonous) are formed due to deflation of ore sources or gold–bearing reservoirs, and placers of heterogeneous origin are formed by deflation of previously formed coastal-lake placers or as a result of alternating activity of temporary watercourses and Aeolian processes. The presence of pseudo-ore gold in the lacustrine-alluvial deposits suggested the arrival of gold from gold-bearing conglomerates of the Mesozoic age. So, based on the results of mineralogical studies of placer gold and field observations, it has been proved that for the first time isolated Aeolian gold and pseudorudic gold deposits on the territory of Mongolia, at a qualitatively new level of knowledge, make it possible to establish the genesis of the formation of gold-bearing placers, as well as more correctly predict the location of gold sources and select methods for their search.
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