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Experimental simulation of bubble nucleation and magma ascent in basaltic systems : implications for Stromboli volcano.

Nolwenn Le Gall 1, 2 Michel Pichavant 1, 2
1 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
2 Magma - UMR7327
ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
Abstract : The ascent of H2O- and HO-CO2-bearing basaltic melts from the deeper to the shallower part of the Stromboli magmatic system and their vesiculation were simulated from decompression experiments. A well-studied “golden” pumice produced during an intermediate to a large-scale paroxysm was used as starting material. Volatile-bearing glasses were synthesized at an oxygen fugacity (fO2) ranging from NNO–1.4 to +0.9, 1200°C and 200 MPa. The resulting crystal and bubble-free glasses were then isothermally (1200°C) decompressed to final pressures Pf ranging between 200 and 25 MPa, at a linear ascent rate of 1.5 m/s (or 39 kPa/s) prior to be rapidly quenched.
Keywords : Volatiles Stromboli Basalt Magma ascent Magm a degassing Bubble 44 nucleation Fragmentation
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https://hal-insu.archives-ouvertes.fr/insu-01321433
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Submitted on : Wednesday, May 25, 2016 - 4:01:14 PM
Last modification on : Wednesday, October 14, 2020 - 3:40:37 AM

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Nolwenn Le Gall, Michel Pichavant. Experimental simulation of bubble nucleation and magma ascent in basaltic systems : implications for Stromboli volcano.. American Mineralogist, Mineralogical Society of America, 2016, 101, pp.1967-1985. ⟨10.2138/am-2016-5639⟩. ⟨insu-01321433⟩

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