On zonality of ore occurrences in the central part of the Miao-Chan Ridge

Abstract

In connection with the search for blind ore bodies and the evaluation of mineralization at depth, the study of vertical and horizontal zonation has recently received increasing attention. In this regard, the area of the central part of the Miao-Chan Ridge belongs to the region of Mesocenozoic folding and is composed of terrigenous formations of Jurassic age and Cretaceous effusives. Sand-shale strata of the Middle and Upper Jurassic are crushed into northeastern strike-slip folds and unconformably overlain by Cretaceous effusives of acidic and medium composition. The Cretaceous sediments are also folded into gentle folds. Discordant small intrusions of Upper Cretaceous age are widely developed in the area, more often with a characteristic hybrid composition - gabbro, gabbro-monzonites, diorites, diorite-porphyrites. Magmatic activity in the area ended with the introduction of a series of dykes of lamprophyre composition.