TY JOUR TI Microspherulites in a biogenic-abiogenic carbonate formation (the Lower Maeotian carbonates, Cape Kazantip, the Kerch Peninsula) KW pelitomorphic matrix KW microspherulites KW mineralized biofilms KW authigenic mineral formation KW gas-fluid seeps KW Kazantip paleovolcano JO Vestnik of geosciences AU Antoshkina, A.I. PY 2023 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"