Eruptive Fluid Fracture Formations of the Nakyn Diamondiferous Field of Yakutia

Abstract

In the Nakyn diamondiferous field of the West Yakutia province various fluid fracture formations, including kimberlites, eruption breccias of basites, fluid fracture carbonate breccias, and accompanying fluidizite streaks were identified. The characteristic petrographic features and patterns of distribution of these formations in the rocks of the Lower Paleozoic sedimentary cover are presented. The predominantly tectonic control of the fluid fracture formations and their bi- and confocal distribution was revealed. It is suggested that the formations resulted from phreatic explosions of different ages directed along faults.