6533b836fe1ef96bd12a152a
RESEARCH PRODUCT
Pre- and syn-eruptive geochemistry of volcanic gases from Soufriere Hills of Montserrat, West Indies
M. P. SemetFrancesco ParelloPhilippe Jean-baptisteGilbert HammouyaPatrick AllardS. R. Youngsubject
010504 meteorology & atmospheric sciencesLava75252 Paris cedex 05GeochemistryLSCEitaly (e-mail: pare!io010502 geochemistry & geophysics01 natural sciencesHydrothermal circulationBritish Geological SurveyVolcanic Gaseslsce.saclay.cea.ff) PalermoCEA-CNRSImpact craterevent[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment0105 earth and related environmental sciencesevent.disaster_type[SDU.OCEAN]Sciences of the Universe [physics]/Ocean AtmosphereLGSCFrance (semetg?)ipgp.j ussieu.t¾). -SS.R. YoungLava domeIPGPFumaroleGeophysics4 place JussieuDomoMagmambox.unipa.it). 4M.p. SemetGeneral Earth and Planetary Sciences91190 GiftYvette2p. Ailard and P. Jean-BaptisteFrance (e-mail: ailardGeologydescription
International audience; Soufriere Hills fumaroles contained magmaderived volatiles before and during the eruption initiated in 1995 but also preserved a typical and quite steady hydrothermal coinposition. Chemical changes due to increased boiling and a greater input of oxidizing magmatic gas occurred only at Galway's Soufriere, the most active fumarolic field. Hydrothermal buffering of the fumaroles has been favoured by their remote location (!-2 km) froin the eruptive vents and by a preferential degassing of the uprising magma through intrusive conduits under the crater. High temperature (720øC) gas collected froin the extruding lava dome in Feb. 1996 was chemically and isotopically representative of the magmatic gas stream. Its coinposition allows assessment of average eruptive fluxes of H20, CO 2 and HCI which require the degassing of only 2.5-3 times more magma than erupted.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1998-10-01 |