Computer Science
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.354..139b&link_type=abstract
Nature (ISSN 0028-0836), vol. 354, Nov. 14, 1991, p. 139, 140. Research supported by FNRS.
Computer Science
28
Anhydrides, Magma, Pumice, Sulfur Compounds, Volcanoes, Aerosols, Climate Change, Philippines
Scientific paper
The presence of primary anhydrite (CaSO4) phenocrysts in dacitic pumice clasts from the June 14-15 eruption of Mount Pinatubo, which clearly shows that the Mount Pinatubo magma is also rich in sulfur, is reported. The posteruptive sulfur content of the pumices ranges from 0.37 to 0.48 wt pct SO3. The considerable amount of sulfate aerosol should lead to a measurable cooling of the earth's surface over the next few years, and could also trigger heterogeneous chemical reactions leading to stratospheric ozone depletion. This new eruption of a sulfur-rich silicic magma thus shows that the El Chichon eruption is not unique, and that climate-modifying eruptions of this type may be more common than previously believed.
Bernard Alain
Demaiffe Daniel
Mattielli Nadine
Punongbayan Raymundo S.
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