UPb isotopic. Dating of magmatic titanite grains with deformation microtwins from the Sudbury impact structure yielded a 207Pb206Pb age of 1851 ± 12 Ma that records either the shock heating or the crater modification stage of the impact event. The U-Pb dating method is based on the radioactive decay of 238U to 206Pb and 235U to 207Pb, 5.
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