The Alpine Fault Hangingwall Viewed From Within: Structural Analysis of Ultrasonic Image Logs in the DFDP-2B Borehole, New Zealand

Publication type:
Journal article
Metadata:
Autoren
  • Cecile Massiot
  • Bernard Celerier
  • Mai-Linh Doan
  • Tim A Little
  • John Townend
  • David D McNamara
  • Jack Williams
  • Douglas R Schmitt
  • Virginia G Toy
  • Rupert Sutherland
  • Lucie Janku-Capova
  • Phaedra Upton
  • Philippe A Pezard
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000452122500013&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1029/2017GC007368
eISSN
1525-2027
Externe Identifier
  • Clarivate Analytics Document Solution ID: HC9JQ
Ausgabe der Veröffentlichung
8
Zeitschrift
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Paginierung
2492 - 2515
Datum der Veröffentlichung
2018
Status
Published
Titel
The Alpine Fault Hangingwall Viewed From Within: Structural Analysis of Ultrasonic Image Logs in the DFDP-2B Borehole, New Zealand
Sub types
  • Article
Ausgabe der Zeitschrift
19

Data source: Web of Science (Lite)

Other metadata sources:
Abstract
<jats:title>Abstract</jats:title><jats:p>Ultrasonic image logs acquired in the DFDP‐2B borehole yield the first continuous, subsurface description of the transition from schist to mylonite in the hangingwall of the Alpine Fault, New Zealand, to a depth of 818 m below surface. Three feature sets are delineated. One set, comprising foliation and foliation‐parallel veins and fractures, has a constant orientation. The average dip direction of 145° is subparallel to the dip direction of the Alpine Fault, and the average dip magnitude of 60° is similar to nearby outcrop observations of foliation in the Alpine mylonites that occur immediately above the Alpine Fault. We suggest that this foliation orientation is similar to the Alpine Fault plane at ∼1 km depth in the Whataroa valley. The other two auxiliary feature sets are interpreted as joints based on their morphology and orientation. Subvertical joints with NW‐SE (137°) strike occurring dominantly above ∼500 m are interpreted as being formed during the exhumation and unloading of the Alpine Fault's hangingwall. Gently dipping joints, predominantly observed below ∼500 m, are interpreted as inherited hydrofractures exhumed from their depth of formation. These three fracture sets, combined with subsidiary brecciated fault zones, define the fluid pathways and anisotropic permeability directions. In addition, high topographic relief, which perturbs the stress tensor, likely enhances the slip potential and thus permeability of subvertical fractures below the ridges, and of gently dipping fractures below the valleys. Thus, DFDP‐2B borehole observations support the inference of a large zone of enhanced permeability in the hangingwall of the Alpine Fault.</jats:p>
Autoren
  • Cécile Massiot
  • Bernard Célérier
  • Mai‐Linh Doan
  • Tim A Little
  • John Townend
  • David D McNamara
  • Jack Williams
  • Douglas R Schmitt
  • Virginia G Toy
  • Rupert Sutherland
  • Lucie Janku‐Capova
  • Phaedra Upton
  • Philippe A Pezard
DOI
10.1029/2017gc007368
eISSN
1525-2027
ISSN
1525-2027
Ausgabe der Veröffentlichung
8
Zeitschrift
Geochemistry, Geophysics, Geosystems
Sprache
en
Online publication date
2018
Paginierung
2492 - 2515
Datum der Veröffentlichung
2018
Status
Published
Herausgeber
American Geophysical Union (AGU)
Herausgeber URL
http://dx.doi.org/10.1029/2017gc007368
Datum der Datenerfassung
2024
Titel
The Alpine Fault Hangingwall Viewed From Within: Structural Analysis of Ultrasonic Image Logs in the DFDP‐2B Borehole, New Zealand
Ausgabe der Zeitschrift
19

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