Weak and Slow, Strong and Fast: How Shear Zones Evolve in a Dry Continental Crust (Musgrave Ranges, Central Australia)

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
  • F Hawemann
  • NS Mancktelow
  • G Pennacchioni
  • S Wex
  • A Camacho
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000459758900012&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1029/2018JB016559
eISSN
2169-9356
Externe Identifier
  • Clarivate Analytics Document Solution ID: HM8UT
ISSN
2169-9313
Ausgabe der Veröffentlichung
1
Zeitschrift
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Paginierung
219 - 240
Datum der Veröffentlichung
2019
Status
Published
Titel
Weak and Slow, Strong and Fast: How Shear Zones Evolve in a Dry Continental Crust (Musgrave Ranges, Central Australia)
Sub types
  • Article
Ausgabe der Zeitschrift
124

Datenquelle: Web of Science (Lite)

Andere Metadatenquellen:
Abstract
<jats:title>Abstract</jats:title><jats:p>The strike‐slip Davenport Shear Zone in Central Australia developed during the Petermann Orogeny (~550 Ma) in an intracontinental lower crustal setting under dry subeclogite facies conditions (~650 °C, 1.2 GPa). This approximately 5‐km‐wide mylonite zone encloses several large low‐strain domains, allowing a detailed study of the initiation of shear zones and their progressive development. Quartzo‐feldspathic gneisses and granitoids contain compositional layers, such as quartz‐rich pegmatites, mafic bands, and dykes, which should preferentially localize viscous deformation if favorably orientated. This is not observed, except for long, continuous, and fine‐grained dolerite dykes. Instead, many shear zones, typically a few millimeters to centimeters in width but extending for tens of meters, commonly exploited pseudotachylytes and are sometimes parallel to a network of little overprinted fractures. The recrystallized mineral assemblage in the sheared pseudotachylyte is similar to that in the host gneiss, without associated hydration due to fluid‐rock interaction. Lack of localization in quartz‐rich, coarser‐grained (typically &gt;50 μm) rocks compared to mafic dykes, precursor fractures, and pseudotachylytes implies that localization in the dry lower crust preferentially occurs along elongate, planar fine‐grained layers. Transient high stress repeatedly initiated fractures, providing finer‐grained, weaker, planar precursors that localized subsequent ductile shear zones. This intimate interplay between brittle and ductile deformation suggests a local source for lower crustal earthquakes, rather than downward migration of earthquakes from the shallower, usually more seismogenic part of the crust.</jats:p>
Autoren
  • F Hawemann
  • NS Mancktelow
  • G Pennacchioni
  • S Wex
  • A Camacho
DOI
10.1029/2018jb016559
eISSN
2169-9356
ISSN
2169-9313
Ausgabe der Veröffentlichung
1
Zeitschrift
Journal of Geophysical Research: Solid Earth
Sprache
en
Online publication date
2019
Paginierung
219 - 240
Datum der Veröffentlichung
2019
Status
Published
Herausgeber
American Geophysical Union (AGU)
Herausgeber URL
http://dx.doi.org/10.1029/2018jb016559
Datum der Datenerfassung
2023
Titel
Weak and Slow, Strong and Fast: How Shear Zones Evolve in a Dry Continental Crust (Musgrave Ranges, Central Australia)
Ausgabe der Zeitschrift
124

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