Explosive basaltic volcanism from Cerro Negro volcano: Influence of volatiles on eruptive style

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).

[1]  W. Bryan,et al.  The influence of water on the petrogenesis of subductionrelated igneous rocks , 1993, Nature.

[2]  G. Layne,et al.  H2O in basalt and basaltic andesite glass inclusions from four subduction-related volcanoes , 1993 .

[3]  C. Robin,et al.  Giant tuff cone and 12-km-wide associated caldera at Ambrym Volcano (Vanuatu, New Hebrides Arc) , 1993 .

[4]  T. Sisson,et al.  Temperatures and H2O contents of low-MgO high-alumina basalts , 1993 .

[5]  N. Dunbar,et al.  Petrogenesis and volatile stratigraphy of the Bishop Tuff: Evidence from melt inclusion analysis , 1992 .

[6]  C. Jaupart,et al.  Gas content, eruption rate and instabilities of eruption regime in silicic volcanoes , 1991 .

[7]  A. T. Anderson,et al.  Homogenizing rhyolitic glass inclusions from the Bishop Tuff , 1990 .

[8]  M. J. Carr,et al.  The Petrogenetic Significance of Interstratified High- and Low-Ti Basalts in Central Nicaragua , 1990 .

[9]  E. A. Bennett,et al.  Incompatible element and isotopic evidence for tectonic control of source mixing and melt extraction along the Central American arc , 1990 .

[10]  M. Perfit,et al.  Water contents, temperatures and diversity of the magmas of the catastrophic eruption of Nevado del Ruiz, Colombia, November 13, 1985 , 1990 .

[11]  A. Klaus,et al.  Explosive Deep Water Basalt in the Sumisu Backarc Rift , 1990, Science.

[12]  S. Vergniolle,et al.  Dynamics of degassing at Kilauea Volcano, Hawaii , 1990 .

[13]  M. J. Carr,et al.  Compositional variations caused by phenocryst sorting at Cerro Negro volcano , 1986 .

[14]  C. Burnham.  Energy release in subvolcanic environments; implications for breccia formation , 1985 .

[15]  Stanley N. Williams,et al.  Plinian airfall deposits of basaltic composition , 1983 .

[16]  Lionel Wilson,et al.  Ascent and eruption of basaltic magma on the earth and moon , 1981 .

[17]  L. Wilson.  Relationships between pressure, volatile content and ejecta velocity in three types of volcanic explosion , 1980 .

[18]  A. T. Anderson,et al.  The October 1974 basaltic tephra from Fuego volcano: Description and history of the magma body , 1978 .

[19]  R. Sparks,et al.  The dynamics of bubble formation and growth in magmas , 1978 .

[20]  Grant Heiken,et al.  Morphology and Petrography of Volcanic Ashes , 1972 .

[21]  D. L. Peck,et al.  The viscosity of basaltic magma; an analysis of field measurements in Makaopuhi lava lake, Hawaii , 1968 .

[22]  M. J. Carr,et al.  Boron geochemistry of the Central American Volcanic Arc: Constraints on the genesis of subduction-related magmas , 1994 .