Crustal-scale rheological transitions during late-orogenic collapse

Olivier Vanderhaeghe, Christian Teyssier

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

Orogeny involves crustal thickening followed by thermal relaxation and radiogenic heat production in the thickened crust, culminating in crustal melting and magma intrusion which decrease the crustal viscosity by several orders of magnitude and cause late-orogenic collapse. Collapse of the Canadian Cordillera is expressed in the Early Tertiary Shuswap metamorphic core complex, British Columbia, which displays a three-layer crustal section separated by two fundamental rheological discontinuities: (1) the brittle-ductile transition, across which high-angle normal faults in the upper crust control basin formation merge into a low-angle detachment zone where leucogranite laccoliths ponded and deformed progressively under submagmatic to low-temperature conditions; and (2) the metatexite-diatexite transition across which the rocks lose their solid framework and behave like a viscous magma. This transition has the potential to mechanically decouple the upper crust from the rest of the lithosphere during a late-orogenic gravitational collapse.

Original languageEnglish (US)
Pages (from-to)211-228
Number of pages18
JournalTectonophysics
Volume335
Issue number1-2
DOIs
StatePublished - Aug 18 2001

Fingerprint

crusts
upper crust
magma
ductile-brittle transition
British Columbia
leucogranite
heat production
gravitational collapse
crustal thickening
basin evolution
cordillera
detachment
intrusion
lithosphere
orogeny
normal fault
discontinuity
viscosity
melting
rocks

Keywords

  • Brittle-ductile transition
  • Canadian cordillera
  • Crustal rheology
  • Gravitational collapse
  • Migmatites
  • Orogeny
  • Partial melting
  • Shuswap metamorphic core complex

Cite this

Crustal-scale rheological transitions during late-orogenic collapse. / Vanderhaeghe, Olivier; Teyssier, Christian.

In: Tectonophysics, Vol. 335, No. 1-2, 18.08.2001, p. 211-228.

Research output: Contribution to journalArticle

Vanderhaeghe, Olivier ; Teyssier, Christian. / Crustal-scale rheological transitions during late-orogenic collapse. In: Tectonophysics. 2001 ; Vol. 335, No. 1-2. pp. 211-228.
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