Abstract

Paleomagnetic analysis of red siliclastics from the Watrous Formation in the Williston Basin of Saskatchewan defines aprimary or early diagenetic remanence of Pennsylvanian age held in hematite. Similar analysis of associated green-grey reduced zones (‘green beds’) defines a latest Cretaceous or earliest Tertiary characteristic remanence held in pyrrhotite and magnetite. The ‘green beds’ may have formed as an alteration product of fluid flow occurring in reducing conditions, which would therefore be constrained to have occurred late in the tectonic history of the Williston Basin. Such a reducing fluid could potentially carry hydrocarbons.

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