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Title: 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:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]
  1. Texas A & M Univ., College Station, TX (United States)
  2. U.S. Geological Survey, Portland, OR (United States)
  3. U.S. Geological Survey, Menlo Park, CA (United States)
  4. 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}
}

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