POSTERUPTIVE ACTIVITY ON THE FIRST CONE OF THE GREAT TOLBACHIK FISSURE ERUPTION AND RECENT VOLCANOGENIC GENERATION OF BAUXITES

Abstract

The posteruptive activity on the First Cone of the Northern break of the Great Tolbachik Fissure Eruption from 1976 to 2003 is characterized based on geochemical studies. Results are presented from the study of the mineralogy and geochemistry of material that occurs in areas where cone gases are released at the surface over a wide range of temperatures. More than 50 volcanic exhalation minerals, including five new mineral varieties, have been identified. The variation in the temperature regime and the cone microtectonics have been analyzed for this material. The geological-mineralogical and biogenic factors which result in the present-day volcanogenic occurrence of aluminum oxide have been discovered.