Journal article

APATITE FISSION-TRACK DATING OF 2 CRATER STRUCTURES IN THE CANADIAN WILLISTON BASIN

BP KOHN, KG OSADETZ, RK BEZYS

BULLETIN OF CANADIAN PETROLEUM GEOLOGY | CANADIAN SOC PETROL GEOLOGISTS | Published : 1995

Abstract

The High Rock Lake and Lake St. Martin structures, on the northeastern flank of the Williston Basin in Manitoba, are circular craters commonly thought to be astroblemes. Apatite fission-track (FT) ages from basement rocks in the two structures are markedly younger than those previously derived in the region. Constraints from regional geohistory combined with forward modelling of apatite FT data are discussed. The estimated time of cratering is in excellent agreement with stratigraphic evidence which constrains the event as Late Ordovician to Mid-Silurian. The resetting of apatite FT clocks within the basement rocks by two discrete Phanerozoic cratering events provides a unique opportunity to..

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