Evidence for coeval Late Triassic terrestrial impacts from the Rochechouart (France) meteorite crater

Details Evidence for coeval Late Triassic terrestrial impacts from the Rochechouart (France) meteorite crater Evidence for coeval Late Triassic terrestrial impacts from the Rochechouart (France) meteorite crater

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmgp11a0056g&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #GP11A-0056

Mathematics

Logic

1527 Paleomagnetism Applied To Geologic Processes, 1530 Rapid Time Variations, 1533 Remagnetization, 1535 Reversals: Process, Timescale, Magnetostratigraphy, 5420 Impact Phenomena, Cratering (6022, 8136)

Scientific paper

High temperature impact melt breccias from the Rochechouart (France) meteorite crater record a magnetization component with antipodal, normal and reverse polarities. The corresponding paleomagnetic pole for this component lies between the 220 Ma and 210 Ma reference poles on the Eurasian apparent polar wander path, consistent with the 214 ± 8 Ma ^{40} Ar/ ^{39} Ar age of the crater [Kelley and Spray, 1997]. Late Triassic tectonic reconstructions of the Eurasian and North American plates place this pole within 95 % confidence limits of the paleomagnetic pole from the Manicouagan (Canada) meteorite impact crater, which is dated at 214 ± 1 Ma [Hodych and Dunning, 1992]. Together, these observations reinforce the hypothesis of Spray et al. [1998] for a Late Triassic, multiple meteorite impact event on Earth. References: Hodych, J. P., and G. R. Dunning (1992), Did the Manicouagan impact trigger end-of-Triassic mass extinction?, Geology, 20, 51-54. Kelley, S. P., and J. G. Spray (1997), A late Triassic age for the Rochechouart impact structure, France, Meteor., 32, 629-636. Spray, J. G., S. P. Kelley, and D. B. Rowley (1998), Evidence for a late Triassic multiple impact event on Earth, Nature, 392, 171-173.

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