The Influence of Episodic Shallow Magma Degassing on Heat and Chemical Transport in Volcanic Hydrothermal Systems
Abstract
Abstract Springs at La Soufrière of Guadeloupe have been monitored for nearly four decades since the phreatic eruption and associated seismic activity in 1976. We conceptualize degassing vapor/gas mixtures as square‐wave sources of chloride and heat and apply a new semianalytic solution to demonstrate that chloride and heat pulses with the same timing and duration result in good matches between measured and simulated spring temperatures and concentrations. While the concentration of chloride pulses is variable, the local boiling temperature of 96°C was assigned to all thermal pulses. Because chloride is a conservative tracer, chloride breakthrough is only affected by one‐dimensional advection and dispersion. The thermal tracer is damped and lagged relative to chloride due to conductive heat exchange with the overlying and underlying strata. Joint analysis of temperature and chloride allows estimation of the onset and duration of degassing pulses, refining the chronology of recent magmatic intrusion.
- Authors:
-
- Texas A & M Univ., College Station, TX (United States)
- U.S. Geological Survey, Portland, OR (United States)
- U.S. Geological Survey, Menlo Park, CA (United States)
- Institut de Physique du Globe de Paris Paris France
- Publication Date:
- Research Org.:
- US Geological Survey, Boulder, CO (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1537308
- Alternate Identifier(s):
- OSTI ID: 1433036
- Grant/Contract Number:
- EE0007169; DE‐EE0007169
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 45; Journal Issue: 7; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Geology
Citation Formats
Chen, Kewei, Zhan, Hongbin, Burns, Erick R., Ingebritsen, Steven E., and Agrinier, Pierre. The Influence of Episodic Shallow Magma Degassing on Heat and Chemical Transport in Volcanic Hydrothermal Systems. United States: N. p., 2018.
Web. doi:10.1002/2017gl076449.
Chen, Kewei, Zhan, Hongbin, Burns, Erick R., Ingebritsen, Steven E., & Agrinier, Pierre. The Influence of Episodic Shallow Magma Degassing on Heat and Chemical Transport in Volcanic Hydrothermal Systems. United States. https://doi.org/10.1002/2017gl076449
Chen, Kewei, Zhan, Hongbin, Burns, Erick R., Ingebritsen, Steven E., and Agrinier, Pierre. Sat .
"The Influence of Episodic Shallow Magma Degassing on Heat and Chemical Transport in Volcanic Hydrothermal Systems". United States. https://doi.org/10.1002/2017gl076449. https://www.osti.gov/servlets/purl/1537308.
@article{osti_1537308,
title = {The Influence of Episodic Shallow Magma Degassing on Heat and Chemical Transport in Volcanic Hydrothermal Systems},
author = {Chen, Kewei and Zhan, Hongbin and Burns, Erick R. and Ingebritsen, Steven E. and Agrinier, Pierre},
abstractNote = {Abstract Springs at La Soufrière of Guadeloupe have been monitored for nearly four decades since the phreatic eruption and associated seismic activity in 1976. We conceptualize degassing vapor/gas mixtures as square‐wave sources of chloride and heat and apply a new semianalytic solution to demonstrate that chloride and heat pulses with the same timing and duration result in good matches between measured and simulated spring temperatures and concentrations. While the concentration of chloride pulses is variable, the local boiling temperature of 96°C was assigned to all thermal pulses. Because chloride is a conservative tracer, chloride breakthrough is only affected by one‐dimensional advection and dispersion. The thermal tracer is damped and lagged relative to chloride due to conductive heat exchange with the overlying and underlying strata. Joint analysis of temperature and chloride allows estimation of the onset and duration of degassing pulses, refining the chronology of recent magmatic intrusion.},
doi = {10.1002/2017gl076449},
journal = {Geophysical Research Letters},
number = 7,
volume = 45,
place = {United States},
year = {Sat Mar 31 00:00:00 EDT 2018},
month = {Sat Mar 31 00:00:00 EDT 2018}
}
Web of Science
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