HR: 0800h
AN: V41B-1449    [Abstracts]
TI: Melt Inclusions From Minopoli 1 Eruptive Products (Campi Flegrei, Campagna, Italy)
AU: * Cannatelli, C
EM: claudiac@vt.edu
AF: Department of Geophysics and Volcanology, University of Naples "Federico II", Via Mezzocannone, 8, Naples, 80134 Italy
AU: * Cannatelli, C
EM: claudiac@vt.edu
AF: Fluid Research Laboratory, Virginia Polytechnic Institute and State University, 4044 Derring Hall, Dept. of Geosciences, Blacksburg, VA 24061 United States
AU: Lima, A
EM: anlima@unina.it
AF: Department of Geophysics and Volcanology, University of Naples "Federico II", Via Mezzocannone, 8, Naples, 80134 Italy
AU: De Vivo, B
EM: bdevivo@unina.it
AF: Department of Geophysics and Volcanology, University of Naples "Federico II", Via Mezzocannone, 8, Naples, 80134 Italy
AU: Bodnar, R J
EM: rjb@vt.edu
AF: Fluid Research Laboratory, Virginia Polytechnic Institute and State University, 4044 Derring Hall, Dept. of Geosciences, Blacksburg, VA 24061 United States
AU: Webster, J D
EM: jdw@amnh.org
AF: American Museum Natural History, Department of Earth and Planetary Sciences, Central Park West at 79th Street , New York, NY 10024-5192 United States
AB: Campi Flegrei is an active volcanic caldera near the city of Naples, Italy, (more than 3 million inhabitants) and the Somma-Vesuvius volcanic complex. Naples and the surrounding area represent one of the world's best examples of a high volcanic risk area. Eruption forecasting and volcanic hazard assessment are essential for developing strategies to mitigate volcanic risk, and processes occurring in the magma chamber have an important bearing on the way a volcanic complex works. Melt inclusions (MI) provide direct information on the physical (pressure, temperature) and chemical (melt composition) conditions that existed in the magma chamber when the host crystals formed, including the volatile content of the melt. Two shoshonite-latite scoria samples from the Minopoli 1 eruption, which occurred between 11.1 and 10.3 ka, were analyzed. MI hosted in clinopyroxene from sample C1 vary from basalt to trachybasalt, and those hosted in olivine from sample C1 and clinopyroxene from sample C2 are trachybasaltic. Homogenization temperatures range from 1108-1122°C for MI in clinopyroxene in sample C1, from 1120-1145°C for olivine in sample C1, and ~1065°C for clinopyroxene in sample C2. The F concentration of MI in sample C1 is ~ 0.2 wt%, whereas no F was detected in sample C2. Chlorine contents of MI are ~0.4 wt% in both samples. Sulfur contents are ~1 wt% in sample C1 and ~0.4 wt% in sample C2. Water contents range from ~3.7 wt% in sample C1 and are ~3.4 wt% in sample C2. The volatile contents of MI from the Minopoli 1 eruption are low compared to the more explosive Fondo Riccio hydromagmatic eruption that occurred at 9.5 to 10.3 ka. These observations suggest that volatile contents of MI can be used to monitor the explosivity of volcanic eruptions. By studying the explosivity pattern of past eruptions along with the volatile contents of MI from those eruptions, the likelihood of explosive eruptions in the future may be predicted.
DE: 1036 Magma chamber processes (3618)
DE: 1043 Fluid and melt inclusion geochemistry
DE: 1065 Major and trace element geochemistry
SC: Volcanology, Geochemistry, Petrology [V]
MN: Fall Meeting 2005