Explosive Basaltic Volcanism from Cerro Negro Volcano: Influence of Volatiles on Eruptive Style

See allHide authors and affiliations

Science  12 Sep 1997:
Vol. 277, Issue 5332, pp. 1639-1642
DOI: 10.1126/science.277.5332.1639

You are currently viewing the abstract.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution


The 1992 and 1995 basaltic eruptions of Cerro Negro volcano, Nicaragua, had contrasting eruptive styles. Although they were nearly identical in composition, the 1992 eruption was explosive, producing a 7-kilometer-high sustained ash column, whereas the 1995 eruption was essentially effusive. The differences in water and carbon dioxide contents of melt inclusions from the two eruptions define minimum saturation pressures and show how decompression of initially similar magmas influences eruptive style. Before eruption, the explosive 1992 magma retained water and carbon dioxide while ascending to a moderate crustal level (about 6 kilometers), whereas the nonexplosive 1995 magma lost all carbon dioxide by degassing during ascent to shallow crustal levels (about 1 to 2 kilometers).

  • Also at Center for Solid State Science, Box 871704, Arizona State University, Tempe, AZ 85287–1704, USA.

  • Present address: Friends Seminary, 222 East 16 Street, New York, NY 10003, USA.

View Full Text

Stay Connected to Science