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High-Precision Id-Tims U-Pb Zircon Geochronology Of Three Cenomanian Bentonites From The Western Canada Foreland Basin, Ivan R. Barker
High-Precision Id-Tims U-Pb Zircon Geochronology Of Three Cenomanian Bentonites From The Western Canada Foreland Basin, Ivan R. Barker
Digitized Theses
The Western Canada foreland basin contains a rich record of Upper Cretaceous marine
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| and tectonic change, yet is sparse in biostratigraphically useful fauna that permit
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| continental and global correlation. However, numerous extensive bentonites have been
1 mapped in Cenomanian strata and traced into the U.S. portion of the basin where
relationships to globally correlated ammonite zones can be determined. The X, A-X and Bighorn River bentonites provide important calibration points for the Cenomanian Stage. Single zircon crystals from these bentonites were chemically-abraded and dated using high-precision U-Pb ID-TIMS geochronology techniques. The Pb/ U weighted-mean ages are: 95.87±0.10 Ma …