IRON SULFIDES AS AN INDICATOR OF MINERAL FORMING CONDITIONS IN THE MUD VOLCANOES OF AZERBAIJAN Journal title: Geologia i poleznye iskopaemye mirovogo okeana Authors: Yevgeny Shnyukov, Nikolai Maslakov, Adil Aliev, A.D. Ismailzade, A.M. Agaev, V.V. Permyakov Subject(s):