Petrophysical, Geochemical, and Hydrological Evidence for Extensive Fracture-Mediated Fluid and Heat Transport in the Alpine Fault's Hanging-Wall Damage Zone - Archive ouverte HAL Access content directly
Journal Articles Geochemistry, Geophysics, Geosystems Year : 2017

Petrophysical, Geochemical, and Hydrological Evidence for Extensive Fracture-Mediated Fluid and Heat Transport in the Alpine Fault's Hanging-Wall Damage Zone

Mai-Linh Doan
Bernard Celerier
  • Function : Author
  • PersonId : 1026745
Jamie Coussens
  • Function : Author
Tamara Jeppson
  • Function : Author
Lucie Janku-Capova
  • Function : Author
Phaedra Upton
  • Function : Author
Douglas R. Schmitt
  • Function : Author
Philippe Pezard
  • Function : Author
  • PersonId : 1001453
Jack Williams
  • Function : Author
Michael John Allen
  • Function : Author
Leeza Becroft
  • Function : Author
Carolin M. Boese
  • Function : Author
Carolyn Boulton
  • Function : Author
Neil Broderick
  • Function : Author
Brett Carpenter
  • Function : Author
Calum J. Chamberlain
  • Function : Author
Alan Cooper
  • Function : Author
Ashley Coutts
  • Function : Author
Lisa Craw
  • Function : Author
Jennifer D. Eccles
  • Function : Author
Dan Faulkner
  • Function : Author
Jason Grieve
  • Function : Author
Julia Grochowski
  • Function : Author
Anton Gulley
  • Function : Author
Arthur Hartog
  • Function : Author
Gilles Henry
  • Function : Author
  • PersonId : 987862
Jamie Howarth
  • Function : Author
Naoki Kato
  • Function : Author
Steven Keys
  • Function : Author
Martina Kirilova
  • Function : Author
Yusuke Kometani
  • Function : Author
Weiren Lin
  • Function : Author
Tim Little
  • Function : Author
Adrienn Lukacs
  • Function : Author
Deirdre Mallyon
  • Function : Author
Elisabetta Mariani
  • Function : Author
Loren Mathewson
  • Function : Author
Ben Melosh
  • Function : Author
Catriona Menzies
  • Function : Author
Jo Moore
  • Function : Author
Luis Morales
  • Function : Author
  • PersonId : 908871
Hiroshi Mori
  • Function : Author
André Niemeijer
Osamu Nishikawa
  • Function : Author
Olivier Nitsch
  • Function : Author
Jehanne Paris
  • Function : Author
David Prior
  • Function : Author
Katrina Sauer
  • Function : Author
Martha Savage
  • Function : Author
Anja Schleicher
  • Function : Author
Norio Shigematsu
  • Function : Author
Sam Taylor-Offord
  • Function : Author
Damon Teagle
Konrad Weaver
  • Function : Author
Martin Zimmer
  • Function : Author

Abstract

Fault rock assemblages reflect interaction between deformation, stress, temperature, fluid, and chemical regimes on distinct spatial and temporal scales at various positions in the crust. Here we interpret measurements made in the hanging‐wall of the Alpine Fault during the second stage of the Deep Fault Drilling Project (DFDP‐2). We present observational evidence for extensive fracturing and high hanging‐wall hydraulic conductivity (∼10−9 to 10−7 m/s, corresponding to permeability of ∼10−16 to 10−14 m2) extending several hundred meters from the fault's principal slip zone. Mud losses, gas chemistry anomalies, and petrophysical data indicate that a subset of fractures intersected by the borehole are capable of transmitting fluid volumes of several cubic meters on time scales of hours. DFDP‐2 observations and other data suggest that this hydrogeologically active portion of the fault zone in the hanging‐wall is several kilometers wide in the uppermost crust. This finding is consistent with numerical models of earthquake rupture and off‐fault damage. We conclude that the mechanically and hydrogeologically active part of the Alpine Fault is a more dynamic and extensive feature than commonly described in models based on exhumed faults. We propose that the hydrogeologically active damage zone of the Alpine Fault and other large active faults in areas of high topographic relief can be subdivided into an inner zone in which damage is controlled principally by earthquake rupture processes and an outer zone in which damage reflects coseismic shaking, strain accumulation and release on interseismic timescales, and inherited fracturing related to exhumation.
Fichier principal
Vignette du fichier
Townend2017_.pdf (4 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive
Loading...

Dates and versions

hal-01737938 , version 1 (26-06-2018)

Identifiers

Cite

John Townend, Rupert Sutherland, Virginia G. Toy, Mai-Linh Doan, Bernard Celerier, et al.. Petrophysical, Geochemical, and Hydrological Evidence for Extensive Fracture-Mediated Fluid and Heat Transport in the Alpine Fault's Hanging-Wall Damage Zone. Geochemistry, Geophysics, Geosystems, 2017, 18 (12), pp.4709-4732. ⟨10.1002/2017GC007202⟩. ⟨hal-01737938⟩
658 View
106 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More