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

¹ Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
² University of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0, Canada
³ University of Regina, Regina, Saskatchewan S4P 4V4, Canada
⁴ Manitoba Industry, Trade and Mines, 1395 Ellice Avenue, Winnipeg, Manitoba R3G 3P2, Canada

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.

Key Words: collision • seismic reflection profiles • suture zones • tectonics

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