POLYGENETIC COMPOUND ORE DEPOSITS AND THEIR ORIGIN IN THE CONTEXT OF REGULARITIES IN CRUSTAL EVOLUTION

<正> Polygenetic compound ore deposits are here defined as those ore deposits which evidently possess many-sided genetic characteristics as a comprehensive result of more than one mineralization stages, from many material sources, and of many genetic types. They are formed most commonly during the diwa (geodepression) stage in the process of crustal evolution and, therefore, spread most widely in diwa regions. At the present stage of our knowledge, they may be subdivided into three principal models and many types of metallogenesis, controlled by different geotectonic conditions and being distributed in time and in space according to the corresponding regularities. This is a newly recognized, third genetic type of ore deposits, being not reasonable to be simply referred to either pure endogenic or pure exogenic origin. They are very important and are of great study-significance, because they commonly are rich and have a large amount of reserve with high. economic value.