Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3501b&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 23, p. 3501-3504
Physics
8
Volcanology, Volcanology: Eruption Mechanisms, Volcanology: Magma Migration, Volcanology: Physics And Chemistry Of Magma Bodies
Scientific paper
Melt and fluid inclusions in olivines from the last 1998 eruption of Piton de la Fournaise (PdF), have recorded a range of volatile partial pressures (350-420 MPa), the highest, so far for this volcano, are found in Fo-rich olivines from a vent remote from the main eruptive activity. Such pressures indicate that fractionation of olivine (and other crystals) occur below the crust-mantle boundary in a CO2-rich volatile saturated environment. Together with previously published data, the model that emerges for PdF is one where olivines which have crystallized from multiple past magma injection events [see Albarède et al., 1997], may be picked up by newly intruding magma, anywhere from upper-mantle depths to the surface. This model is likely to apply to other shield volcanoes. Magma production and transport to the surface is accompanied by continuous open-system degassing through the permeable volcanic pile. The calculated H2O content of primary basalts (MgO~12-14wt.%) from PdF may reach 0.7-1 wt.% implying a rather H2O-rich hot spot mantle source.
Bureau Hélène
Métrich Nicole
Semet Michel P.
Staudacher Thomas
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