Lithology of Lower Permian Carbonate and Sulfate Evaporites at the Area of a «Classical» Kungurian sediments: Perm kray

Abstract

Lithological study of carbonate and sulfate evaporites of the "classical" Kungur sediments (Perm kray) allowed identifying that these strata were created during the five formation cycles of the evaporate basin finalized with its shrinkage (except the territory of the Solikamsk basin). Replacement of thin-bedded pelitomorphic or massive oolitic dolomite by chevron, massive and nodular sulfates within a cyclothem may indicate the regular variation of basin water concentration during a cycle. This cyclothems structure and their numerous alternations in cross-section of Lower Permian evaporites are indicators of sedimentation in the widespread shallow, periodically freshened basin. Sulfates texture is formed at a sedimentation-and-diagenesis stage and depends on the content of not-sulfate materials in the rock and anisotropy of the minerogenesis environment. Lithologic features of younger Solikamsk rocks formed after chlorides in the Solikamsk basin allow supposing that their formation conditions were close to modern sabkha.

Keywords

• Пермский край
• карбонатные и сульфатные эвапориты
• литология
• иренская свита
• кунгур