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GEOREF RECORD

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 and H. V. Zwanzig
Suture-zone geometry along an irregular Paleoproterozoic margin; the Superior boundary zone, Manitoba, Canada
Geology (Boulder) (August 2002) 30 (8): 735-738

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 approximately 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 decollement. 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.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 30
Serial Issue: 8
Title: Suture-zone geometry along an irregular Paleoproterozoic margin; the Superior boundary zone, Manitoba, Canada
Affiliation: Geological Survey of Canada, Ottawa, ON, Canada
Pages: 735-738
Published: 200208
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 24
Accession Number: 2002-079348
Categories: Solid-earth geophysicsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Lithoprobe Contrib. No. 1279; Geol. Surv. Can., Contrib. No. 2001176
Illustration Description: sects., geol. sketch map
N54°00'00" - N56°00'00", W98°00'00" - W95°30'00"
Secondary Affiliation: University of Saskatchewan, CAN, CanadaUniversity of Regina, CAN, CanadaManitoba Industry, Trade and Mines, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200224
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