Suture-zone geometry along an irregular Paleoproterozoic margin: The Superior boundary zone, Manitoba, Canada

D. J. White, S. B. Lucas, W. Bleeker, Z. Hajnal, J. F. Lewry, H. V. Zwanzig

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Lithoprobe acquired a 190-km-long deep seismic reflection profile across the Superior boundary zone at the eastern margin of the Paleoproterozoic Trans-Hudson orogen. The profile is located ∼250 km south of a major promontory along the ancient margin of the Superior craton and complements earlier profiles closer to the promontory. The new data image the remnants of a craton-verging thrust belt, younger than 1864 Ma, within the Superior boundary zone extending to a maximum depth of 15 km above a shallowly west dipping basal décollement. Across the surface suture zone, a dip reversal to east-dipping reflections occurs within the adjacent Reindeer zone, where a crustal-scale imbricate stack is imaged. Reindeer zone lower crust and upper mantle extend eastward beneath the Superior craton margin for 40-100 km. Preservation of a foreland thrust belt within the Superior boundary zone is explained as a result of reduced collisional convergence and subsequent exhumation within a reentrant flanking the Thompson promontory.

Original languageEnglish
Pages (from-to)735-738
Number of pages4
JournalGeology
Volume30
Issue number8
DOIs
Publication statusPublished - Aug 1 2002

Keywords

  • Collision
  • Seismic reflection profiles
  • Suture zones
  • Tectonics

ASJC Scopus subject areas

  • Geology

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