The significance of heat transport by shallow fluid flow at an active plate boundary; the Southern Alps, New Zealand
The significance of heat transport by shallow fluid flow at an active plate boundary; the Southern Alps, New Zealand
Fluid flow can influence fault behavior. Here we quantify the role of groundwater heat advection in establishing the thermal structure of the Alpine Fault, a major tectonic boundary in southern New Zealand that accommodates most of the motion between the Australian and Pacific Plates. Convergence on the Alpine Fault has rapidly uplifted the Southern Alps, resulting in high geothermal gradients and a thin seismogenic zone. A new equilibrium temperature profile from the 818 m‐deep Deep Fault Drilling Project 2B (DFDP‐2B) borehole has been interrogated using one‐dimensional analytical models of fluid and rock advection. Models indicate a total heat flux of 720 mW·m‐2 results from groundwater flow with Darcy velocities approximating to 7.8×10‐10 m·s‐1. Groundwaters advect significantly more heat than rock advection in the shallow orogen (<6 km depth) and are the major control on the subsurface temperature field.
Coussens, Jamie
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Woodman, Nicholas
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Upton, Phaedra
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Menzies, Catriona D
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Janku-Capova, Lucie
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Sutherland, Rupert
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Teagle, Damon A H
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Coussens, Jamie
10b295ab-dcbb-4111-baa0-d21e631d6af4
Woodman, Nicholas
9870f75a-6d12-4815-84b8-6610e657a6ad
Upton, Phaedra
45d085d3-dc9f-4233-8ef0-f8094d5a6728
Menzies, Catriona D
04bc2a62-064d-4911-9c45-17b47f3005de
Janku-Capova, Lucie
8f2daee3-da5d-445d-b08f-9bdff288b4ec
Sutherland, Rupert
e1194f14-af6c-4982-9276-599e56dd4b6b
Teagle, Damon A H
396539c5-acbe-4dfa-bb9b-94af878fe286
Coussens, Jamie, Woodman, Nicholas, Upton, Phaedra, Menzies, Catriona D, Janku-Capova, Lucie, Sutherland, Rupert and Teagle, Damon A H
(2018)
The significance of heat transport by shallow fluid flow at an active plate boundary; the Southern Alps, New Zealand.
Geophysical Research Letters.
(doi:10.1029/2018GL078692).
Abstract
Fluid flow can influence fault behavior. Here we quantify the role of groundwater heat advection in establishing the thermal structure of the Alpine Fault, a major tectonic boundary in southern New Zealand that accommodates most of the motion between the Australian and Pacific Plates. Convergence on the Alpine Fault has rapidly uplifted the Southern Alps, resulting in high geothermal gradients and a thin seismogenic zone. A new equilibrium temperature profile from the 818 m‐deep Deep Fault Drilling Project 2B (DFDP‐2B) borehole has been interrogated using one‐dimensional analytical models of fluid and rock advection. Models indicate a total heat flux of 720 mW·m‐2 results from groundwater flow with Darcy velocities approximating to 7.8×10‐10 m·s‐1. Groundwaters advect significantly more heat than rock advection in the shallow orogen (<6 km depth) and are the major control on the subsurface temperature field.
Text
GRL Revised 10092018
- Author's Original
Text
2018GL078692
- Accepted Manuscript
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Accepted/In Press date: 12 September 2018
e-pub ahead of print date: 17 September 2018
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Local EPrints ID: 423816
URI: http://eprints.soton.ac.uk/id/eprint/423816
ISSN: 1944-8007
PURE UUID: 9cf0e036-d8f2-4246-8626-bb4a424fa4ce
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Date deposited: 02 Oct 2018 16:30
Last modified: 16 Mar 2024 07:07
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Author:
Jamie Coussens
Author:
Phaedra Upton
Author:
Catriona D Menzies
Author:
Lucie Janku-Capova
Author:
Rupert Sutherland
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