1. Carbon Isotope Evidence of Methanogenesis in Sediments of the Dal’nyaya Taiga Group (Lower Vendian of the Patom Basin, Siberia)

   • P. Yu. Petrov
   • B. G. Pokrovsky

   OriginalPaper 22 March 2020 Pages: 83 - 94

   

2. Strontium Isotopic Composition in Carbonate from Breccias of Mud Volcanoes of Azerbaijan

   • M. I. Bujakaite
   • V. Yu. Lavrushin
   • B. G. Pokrovsky

   OriginalPaper 22 March 2020 Pages: 95 - 98

   

3. Geochemical Environments of Precambrian Sedimentation

   • V. G. Kuznetsov

   OriginalPaper 22 March 2020 Pages: 99 - 110

   

4. Isotopic Composition (δ¹³C, δ¹⁸O) and Genesis of Carbonates from Phosphorite Deposits in the Lesser Karatau (Kazakhstan)

   • V. N. Kuleshov
   • A. F. Georgievskii
   • V. M. Bugina

   OriginalPaper 22 March 2020 Pages: 111 - 130

   

5. Velingrad Hydrogeothermal System (Bulgaria): Geochemical Features and Heat Output

   • B. G. Polyak
   • O. E. Kikvadze
   • B. Deneva

   OriginalPaper 22 March 2020 Pages: 131 - 138

   

6. Genesis, Features of Mineral Composition, and Problems of the Development of Rare Metal–Titanium Placers in the West Siberian Megaprovince

   • E. N. Levchenko
   • D. S. Klyucharev
   • A. V. Lalomov

   OriginalPaper 22 March 2020 Pages: 139 - 151

   

7. Clay Minerals in Basalt Sills from the Sediment Cover, East Pacific Rise

   • V. B. Kurnosov
   • B. A. Sakharov
   • E. O. Goncharov

   OriginalPaper 22 March 2020 Pages: 152 - 163