Some features of Late Upper Jurassic effusives of Priargunya and their metallogenic significance
Abstract
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 ...
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