Structure of the lithospheric mantle beneath the Trans-Hudson Orogen, Canada

Balázs Németh, Z. Hajnal

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Refraction and wide-angle reflection seismic data collected in northern Saskatchewan and Manitoba in 1993 by LITHOPROBE provide new glimpses of the deep structure of the lithospheric mantle beneath the Trans-Hudson Orogen. Velocity models obtained through ray-tracing modelling techniques revealed the presence of complicated mantle structures down to a depth of 160 km beneath the orogen. Like the crust, the lithospheric mantle appears to show a seismically transparent upper and a highly reflective lower part, suggesting that the rheological environment responsible for development of reflections in the lithospheric mantle and of that in the crust are similar. This appears to be consistent with the observation that the strong and brittle upper 30 km of the mantle contain remnants of former tectonic processes in a form of velocity anisotropy, and the lower, more ductile zone seems highly reflective and isotropic. The suspected beginning of the lithosphere-asthenosphere transition zone at a depth of 160 km, imaged as gradual disappearance of mantle reflections, coincides well with models established using other geophysical methods.

Original languageEnglish
Pages (from-to)93-104
Number of pages12
JournalTectonophysics
Volume288
Issue number1-4
Publication statusPublished - Mar 30 1998

Fingerprint

Canada
Earth mantle
mantle
crusts
crust
Manitoba
Saskatchewan
mantle structure
geophysical method
ray tracing
asthenosphere
refraction
transition zone
lithosphere
seismic data
anisotropy
tectonics
modeling

Keywords

  • Anisotropy
  • Lithosphere
  • Ray tracing
  • Reflection
  • Seismic refraction
  • Upper mantle

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geophysics

Cite this

Structure of the lithospheric mantle beneath the Trans-Hudson Orogen, Canada. / Németh, Balázs; Hajnal, Z.

In: Tectonophysics, Vol. 288, No. 1-4, 30.03.1998, p. 93-104.

Research output: Contribution to journalArticle

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