Material composition and formation conditions of lower Paleozoic sandstones of Engane-Pe Ridge (Polar Urals)

Abstract

The paper presents the results of the study of the material composition of Upper Cambrian-Lower Ordovician Manitanyrd sandstones series in the southern part of Engane-Pe Ridge (Polar Urals). The study of the lithological and geochemical characteristics of feldspar-quartz sandstones has confirmed their formation in a shallow-water basin at the passive continental margin in a cold climate. An episode of volcanic activity, associated with the epicontinental riftogenesis, resulted in the appearance of a sub-comformable body of ultra-potassium basaltoids, and at a distance from it, there is a sandstone horizon containing "concretion" formations. In the composition of the sandstones there is a slightly altered volcanomictic material but they lack of recycled fragments and redeposited material of the weathering crust. The petrochemical features of Manitanyrd sandstones do not allow expecting sedimentary gold mineralization in them.

Keywords

• песчаник
• вещественный состав
• обломки
• условия осадконакопления