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Pressure recovery in magma due to bubble growth
Author(s) -
Nishimura Takeshi
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl019810
Subject(s) - magma , geology , dike , magma chamber , cabin pressurization , bubble , overpressure , petrology , intrusion , volcano , seismology , mechanics , geochemistry , materials science , thermodynamics , physics , composite material
Pressure recovery in magma subject to sudden depressurization is investigated in terms of the growth of bubbles containing magmatic volatiles. Assuming conservation of volatile mass and pressure equilibration between the bubbles, melt and a surrounding elastic medium, the final magma pressure is completely determined by its initial pressure and the magnitude of the pressure drop. Simulations show that the initial magma pressure is easily recovered, or even exceeded, when magma containing tiny bubbles is surrounded by a relatively stiff elastic medium under low confining pressure. This result suggests that when processes such as magma withdrawal, dike intrusion, and nearby seismicity decrease the pressure in a magma chamber, magma re‐pressurization can occur without new injection of magma.