2-18-5

Facies of the continental formations’ volcanogenic rocks

O. N. Gryaznov

 

DOI http://dx.doi.org/10.21440/2307-2091-2018-2-35-40

O. N. Gryaznov / News of the Ural State Mining University 2 (2018) 35-40

 

The relevance of the work is conditioned by the need to identify facies types of volcanogenic complexes in order to identify patterns of localization of hydrothermal mineralization in them.
The purpose of the study is the substantiation of the necessity to study the facies of the volcanogenic rocks and their role in controlling the localization of hydrothermal mineralization.
The research methodology is based on the data of geological surveys of volcanogenic complexes and on laboratory studies of rocks.
Results. The article considers the problem of facies of volcanogenic rocks of continental volcanogenic formations. The analysis of representations of M. A. Usov, Yu. A. Kuznetsov, V. K. Monich, E. B. Yakovleva, A. I. Semenov and other researchers is presented. The author associates himself with M. A. Usov and Yu. A. Kuznetsov, and understands the conditions of formation of volcanic rocks by the facies. The main factor is the depth, the secondary one is geological and structural features of the environment. The author is guided by proposed principles and proposes his own classification of facies volcanogenic rocks of the orogenic series. Facies were distinguished by depth of formation, and subfactions were distinguished by secondary factors. Effusive-pyroclastic facies include effusive, extrusion and volcanogenic-sedimentary subfacies. The vent facies covers a neck, a dyke and extrusive subfamilies. Subvolcanic facies is presented by the subfamily of subvolcanic intrusions and the dyke one. A hypabyssal facies includes subfile hypabyssal intrusions and dykes. Each subfamily is characterized by its inherent bodies of the corresponding shape. The characteristic of the named facies, subfamily and bodies is presented. In conclusion, the need is emphasized to study and discuss the issue in order to identify patterns of localization of mineralization of volcanic formations.

Keywords: facies; subfunctions; conditions of formation of volcanic bodies.

 

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