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«IZVESTIYA IRKUTSKOGO GOSUDARSTVENNOGO UNIVERSITETA». SERIYA «NAUKI O ZEMLE»
«THE BULLETIN OF IRKUTSK STATE UNIVERSITY». SERIES «EARTH SCIENCES»
ISSN 2073-3402 (Print)

List of issues > Series «Earth Sciences». 2017. Vol. 19

Solifluction Alluvial Model of Origin “Ancient Alluvium” of South Yakutia

Author(s)
S. V. Kaspersky
Abstract
On the example of the Central Aldan gold-bearing region are considered cenozoic formation of «ancient alluvium» having widespread in South Yakutia. The name they got from the particle size distribution of the similarity of modern alluvial formations, however, have a number of distinguishing features: increased gold strata, negative palynological analysis of samples, a weak correlation with the tectonics and relief area. A critical analysis of the genesis of gold deposits these hypotheses (alluvial-deluvium, mixtites). The main purpose of the work: study a new model of the formation of sediments – alluvial solifluction. In this concept, the mechanism of formation of the “ancient alluvium” associated with redeposition products ancient weathering crusts in the era of climate lows with the formation of the inverted profile of the weathering crust in depressions. The main process performs solifluction. In periods of interglacial deposits processed river processes to produce gold placers. This erosion took place in conditions of excess debris in depressions. Erosion terraces-ridges were formed on the basis of loose debris. Thus, the “ancient alluvium” is a sophisticated complex deposits to include up to three levels of placers, where the most gold-bearing is lower, reworked as a product of ancient weathering crusts. Age dating of deposits recommended Eopleistocene-late Pleistocene undifferentiated. The model allows for new insights into the origin and dissemination of data structures, as well as help in the search for gold placers.
Keywords
Central Aldan area, Kuranakh and Lebedinsky types of gold, the gold-bearing placers, the weathering crust, the glaciation, the interglacial period
UDC
553.411 (571.56)
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