Matrix systematic of the rare-metals granite magmatism and related ore metallization is represented as a table, where geodynamic types of intrusive groups form columns, and genetic types of ore metallization – lines (from rare-metal volcanites, granites and pegmatites to weathering crusts and placers). Cells in crossing of lines and columns include as well known so probable geological-industrial types of ore deposits. Analysis of this table shows which types of deposits may be combined in clusters, and which ones correspond to principally different ore-magmatic systems and, thus, can’t occur in a common cluster (except in combination of diachronous groups). Regularities of the rare-metal granites distribution through geological time correlate with the direct evolution of geodynamic environments in the Earth’s history.
Until now, the degree of study of intrusive massifs, with which associated with a variety of endogenous mineralization, remains insufficient to meet many of the demands of science and practice. In this regard, it is necessary to further improve the methods and techniques of study of these formations and, first of all, methods and techniques of field study of intrusions in the process of their geological survey.
In recent years, the diversity of ideas about the principles of magmatic formations, their relationship with tectonic structures, sequence and conditions of occurrence, the relationship with them mineral deposits, etc. has increased markedly.
Как известно, перспективными на хрусталеносные пегматиты обычно являются посторогенные, обычно межформационные, изометрячные в плане, неглубоко эродированные массивы гранитов существенно кварц-микроклинового состава с повышенным содержанием летучих, образованные в условиях небольших глубин. Наши исследования на территории более чем тридцати гранитоидных массивов позволяют уточнить некоторые из этих региональных поисковых предпосылок ...
