A5011796783- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- Geochemistry and Geologic Mapping
- High-pressure geophysics and materials
- Atmospheric Ozone and Climate
- Climate Change and Geoengineering
- Astro and Planetary Science
- Geological and Geophysical Studies
- Paleontology and Stratigraphy of Fossils
- Planetary Science and Exploration
Institut des Sciences de la Terre de Paris
2020-2021
Centre National de la Recherche Scientifique
2021
Sorbonne Université
2021
Dominica, one of the most magmatically active islands Lesser Antilles through its four volcanoes, is likely host under central part, below Morne Trois Pitons-Micotrin, to a well-established transcrustal mush system. Pre-eruptive spatiotemporal magma dynamics are examined for five, explosive, pumiceous eruptions this volcano in last 24 kyrs combined Crystal System Analysis and intracrystalline Fe-Mg interdiffusion timescales modelling approaches. Before all eruptions, two magmatic...
Abstract The Morne Trois Pitons‐Micotrin volcanic complex on the island of Dominica (Lesser Antilles) emitted a series plinian eruptions between 18 and 9 ka BP. We studied it to constrain magma storage conditions volatile degassing balances, by comparison with three previous ignimbrites (~60–24 BP). Volatile concentrations in glass inclusions mineral‐melt thermobarometry indicate at ≤200 MPa (~6–8 km) 860–880°C. magmas feeding these were stored shallower depth than those that older from same...
<p>Explosive eruptions of the Plinian type inject large amounts particles (pumice, ash, aerosols) and volatile species into atmosphere. They result from rapid discharge a magma chamber involve volumes (from km<sup>3</sup> to hundreds km<sup>3</sup>). Such correspond ascent in conduit driven by exsolution species. If supply is continuous, this jet produces convective eruptive column that can reach tens km height transports...
<p>Dominica island experienced the largest explosive eruptions (ignimbrites) of Lesser Antilles arc. The recent revised chronostratigraphy Morne Trois Pitons – Micotrin eruptive activity evidenced a series plinian that occurred between 18 ka and 9 BP. Here we focus on these in order to determine magma storage conditions at depth volatile degassing budget. Volatile concentrations (H<sub>2</sub>O,...
<p>A transcrustal mush system has been recognized beneath Dominica (Lesser Antilles) with different magma ponding zones that generated a series of pumiceous eruptions from Morne Trois Pitons–Micotrin volcano. Here, the latest, large, eruption (Grand Fond - 24 kyrs cal BP) and four, smaller, Plinian (18-9 are investigated. Pre-eruptive dynamics within unraveled through orthopyroxene phenocrysts by combining Crystal System Analysis approach (on unzoned zoned...