Magma Degassing during 7600 14C Kurile Lake Caldera-Forming Eruption and Its Climatic Impact

The main goal of this investigation is estimating volume of volatile emission, atmospheric and climatic impact of the Kurile Lake caldera-forming eruption, one of the Earth's largest Holocene explosive eruptions. The volatile content of magma before the eruption was estimated by comparing H2O, S, Cl and F contents in natural quenched glassy melt inclusions trapped by plagioclase phenocrysts. The volatile content of igneous rocks after eruption was estimated by comparing concentrations of degassed matrix glasses. As a result of KO-eruption not more than (3.7-4.2) x 10(12) kg of water, (4.3-4.9) x 10(10) kg of chlorine, (8.6-9.8) x 10(9) kg of fluorine and (2.6-2.9) x 10(10) kg of sulphur were injected into the atmosphere. This eruption had to produce an important climatic impact.