Diorites as an intermediate in gold-producing fluid-magmatic granite-doleritic complexes

Abstract

On the example of the Kedrovskiy deposit of North Transbaikalia, conditions of gold-producing fluid-magmatic granite-dolerite complex's making are concretized. Participation in its structure of average igneous rocks, emphasizing in magmatism's generalized antidrome scheme an evolutionary change of early ultrametamorphical granodiorites and quartz diorites of focal-dome construction by moderately alkali quartz diorite porphyrites and further - accompanied by ore-formation of moderate alkaline basaltoids in dyke's facio is shown and is discussed. Presence of diorites in other mesothermal gold deposits reflects, as it is represented, prevalence of the phenomenon of evolutionary transition from early to late magmatities of the discussed fluid-magmatic complexes and explains the expediency of its further studying.