skip to main content

DOE PAGESDOE PAGES

Title: Three-dimensional modeling of outcrop-to-outcrop hydrothermal circulation on the eastern flank of the Juan de Fuca Ridge

We present three-dimensional simulations of coupled fluid and heat transport in the ocean crust, to explore patterns and controls on ridge-flank hydrothermal circulation on the eastern flank of the Juan de Fuca Ridge. Field studies have shown that there is large-scale fluid flow in the volcanic ocean crust in this region, including local convection and circulation between two basement outcrops separated by ~50 km. New simulations include an assessment of crustal permeability and aquifer thickness, outcrop permeability, the potential influence of multiple discharging outcrops, and a comparison between two-dimensional (profile) and three-dimensional representations of the natural system. Field observations that help to constrain new simulations include a modest range of flow rates between recharging and discharging outcrops, secondary convection adjacent to the recharging outcrop, crustal permeability determinations made in boreholes, and the lack of a regional seafloor heat flux anomaly as a consequence of advective heat loss from the crust. Three-dimensional simulations are most consistent with field observations when models use a crustal permeability of 3 ×10 -13 to 2 × 10 -12 m 2, and the crustal aquifer is ≤300 m thick, values consistent with borehole observations. Here, we find fluid flow rates and crustal cooling efficiencies that aremore » an order of magnitude greater in three-dimensional simulations than in two-dimensional simulations using equivalent properties. Lastly, simulations including discharge from an additional outcrop can also replicate field observations but tend to increase the overall rate of recharge and reduce the flow rate at the primary discharge site.« less
Authors:
 [1] ;  [1] ; ORCiD logo [2] ; ORCiD logo [2] ;  [2]
  1. Univ. of California, Santa Cruz, CA (United States). Earth and Planetary Sciences Dept.
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-27653
Journal ID: ISSN 2169-9313
Grant/Contract Number:
AC52-06NA25396; OIA- 0939564; OCE-1031808; OCE-1260408
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 121; Journal Issue: 3; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
National Science Foundation (NSF); USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Earth Sciences; Hydrothermal circulation; fluid flow; heat flow; permeability; modeling; three‐dimensional
OSTI Identifier:
1469543

Winslow, Dustin, Fisher, Andrew, Stauffer, Philip H., Gable, Carl Walter, and Zyvoloski, George Anthony. Three-dimensional modeling of outcrop-to-outcrop hydrothermal circulation on the eastern flank of the Juan de Fuca Ridge. United States: N. p., Web. doi:10.1002/2015JB012606.
Winslow, Dustin, Fisher, Andrew, Stauffer, Philip H., Gable, Carl Walter, & Zyvoloski, George Anthony. Three-dimensional modeling of outcrop-to-outcrop hydrothermal circulation on the eastern flank of the Juan de Fuca Ridge. United States. doi:10.1002/2015JB012606.
Winslow, Dustin, Fisher, Andrew, Stauffer, Philip H., Gable, Carl Walter, and Zyvoloski, George Anthony. 2016. "Three-dimensional modeling of outcrop-to-outcrop hydrothermal circulation on the eastern flank of the Juan de Fuca Ridge". United States. doi:10.1002/2015JB012606. https://www.osti.gov/servlets/purl/1469543.
@article{osti_1469543,
title = {Three-dimensional modeling of outcrop-to-outcrop hydrothermal circulation on the eastern flank of the Juan de Fuca Ridge},
author = {Winslow, Dustin and Fisher, Andrew and Stauffer, Philip H. and Gable, Carl Walter and Zyvoloski, George Anthony},
abstractNote = {We present three-dimensional simulations of coupled fluid and heat transport in the ocean crust, to explore patterns and controls on ridge-flank hydrothermal circulation on the eastern flank of the Juan de Fuca Ridge. Field studies have shown that there is large-scale fluid flow in the volcanic ocean crust in this region, including local convection and circulation between two basement outcrops separated by ~50 km. New simulations include an assessment of crustal permeability and aquifer thickness, outcrop permeability, the potential influence of multiple discharging outcrops, and a comparison between two-dimensional (profile) and three-dimensional representations of the natural system. Field observations that help to constrain new simulations include a modest range of flow rates between recharging and discharging outcrops, secondary convection adjacent to the recharging outcrop, crustal permeability determinations made in boreholes, and the lack of a regional seafloor heat flux anomaly as a consequence of advective heat loss from the crust. Three-dimensional simulations are most consistent with field observations when models use a crustal permeability of 3 ×10-13 to 2 × 10-12 m2, and the crustal aquifer is ≤300 m thick, values consistent with borehole observations. Here, we find fluid flow rates and crustal cooling efficiencies that are an order of magnitude greater in three-dimensional simulations than in two-dimensional simulations using equivalent properties. Lastly, simulations including discharge from an additional outcrop can also replicate field observations but tend to increase the overall rate of recharge and reduce the flow rate at the primary discharge site.},
doi = {10.1002/2015JB012606},
journal = {Journal of Geophysical Research. Solid Earth},
number = 3,
volume = 121,
place = {United States},
year = {2016},
month = {3}
}