The name of Academician A.N. Zavaritsky, one of the greatest scientists of our country, is associated with a significant stage in the development of Soviet petrography and geology of ore deposits.

In the geological literature of the last decade, researchers are increasingly turning to such concepts as geological and ore formation. Increased interest I formational analysis of geological (including ore) formations is explained, in our opinion, by two reasons ...

Mass accumulation of geological data, in many cases having the character of "information explosion", is a process not only of quantitative nature; at a certain stage it leads to the emergence of qualitatively new elements in the very nature of the information obtained ...

Despite the ever-increasing use of formation concepts in metallogenic studies, in the approach to the allocation of ore formations not only does not converge points of view, but, on the contrary, there are new divergences in views ...

Formation analysis of geological and ore formations is increasingly used in geological studies of various kinds, especially in metallogeny. At the same time in the interpretation of such basic concepts as “geological formation”, “magmatic formation” and especially “ore formation”, there are very significant differences ...

With the development of metallogenic ideas about the regular, closely related to the peculiarities of the geological structure of the placement of minerals in the Earth's crust prediction of deposits, the allocation of more and more local areas for prospecting becomes one of the most urgent tasks of theoretical and practical geology. This task has long been solved on the basis of the method of analogies, and its mathematical equipment, widely practiced now, does not change anything in its essence ...

One of the most characteristic features of the activation zones is the clearly expressed independence of the structural plan of the activation period in relation to the structural plan of the basement. In the territory of the Eastern Transbaikalia, chains of troughs, dike belts, chains of intrusions and volcanic apparatuses associated with Late Mesozoic activation cross the boundaries of the basement blocks having different composition and different geological history.

Many geologists-tectonists, as well as specialists dealing with the issues of general and regional metallogeny, consider it necessary to distinguish a special type of structures of the continental earth crust, different from the platform and geosynclinal structures. However, the volume of such structures, the content and nature of the processes generating them and their place in the general history of development of crustal structures are considered from completely different, often opposite points of view.

The widespread use of metallogenic studies of various scales, the need to identify large genetic communities of rocks and ore formations has led to the increasingly widespread use in the geological literature of the term formation in relation to mineral deposits ...

Volcanic formations of Priargunya play a significant role in the metallogenic appearance of the region. A number of types of mineral deposits are paragenetically associated with them, for other deposits they are host rocks, in one way or another affecting the spatial distribution of deposits ...

In the complex history of Mesozoic magmatism and ore formation in the Eastern Transbaikalia, the latest stages of the history, associated with the formation of numerous linearly elongated depressions of northeastern strike, are the least studied. They are bordered by large faults and are filled with Late Mesozoic sedimentary and volcanogenic rocks. It is to the depressions that the areas of the strongest manifestation of young tectonic movements and manifestation of the latest magmatic formations gravitate. Accordingly, the latest manifestations of hydrothermal mineralization in the Eastern Transbaikalia are closely related to depressions themselves or to the systems of discontinuities surrounding them (gold deposits of the Baley type, deposits of fluorspar, ferberite-antimony-nite ores of the Barun-Shivey type, ore occurrences of antimonite, cinnabar, barite, etc.). The overwhelming majority, if not all these ore occurrences, belong to the type of low-temperature hydrothermal formations of shallow depths. Both the source of this mineralization and its age are still disputable. However, in recent years the opinion has been expressed that this mineralization is related to the Lower Cretaceous volcanogenic complexes. Therefore, it is very important to study the history of Lower Cretaceous volcanism of the Eastern Transbaikalia, in particular, to investigate various subvolcanic, vent, etc. formations, since in a number of geologically similar areas their location largely determines the peculiarities of mineralization placement ...

Over the last few years, many works on metallogeny of the Eastern Transbaikalia have raised the question of the relationship between volcanism and hydrothermal formations. In some cases, volcanic structures are considered to be the most favorable sites for localization of mineralization, while in other cases, a closer (genetic and paragenetic) connection between volcanic and hydrothermal processes is assumed. Proponents of the latter point of view in support of their ideas refer to the age proximity of Late Mesozoic volcanogenic complexes and Late Mesozoic mineralization, to the confinement of volcanic formations and ore fields to the same regional structures, to the characteristic surface appearance of ores of a number of deposits, to analogies with other ore areas, in particular, with the classical areas of development of “subvolcanic” deposits. While these arguments are convincing, they lack more direct, geochemical data on the links between volcanic and hydrothermal formations. The identification of such relationships is an important but very laborious task, involving the need to perform and compare a large number of diverse analyses. However, some characteristic petrographic features of the effusive formations of Priargunya can already be used in solving the question about the potential ore-bearing capacity of those magmatic centers with which the effusives are associated ...

Н. V. Petrovskaya in her work “On productive associations in gold deposits” and others states that gold associations in quartz-gold deposits are determined by the simultaneity of sedimentation and chemically or mechanically favorable for gold deposition environment represented by some early minerals. These two types of gold associations have been respectively named constant-productive and alternating-productive.