Impacts and glacio-eustasy, plate-tectonic episodes, geomagnetic reversals: a concept to facilitate detection of impact events

Details Impacts and glacio-eustasy, plate-tectonic episodes, geomagnetic reversals: a concept to facilitate detection of impact events Impacts and glacio-eustasy, plate-tectonic episodes, geomagnetic reversals: a concept to facilitate detection of impact events

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...50..183b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 50, Issue 2, p. 183-194.

Physics

6

Scientific paper

It is suggested that the Cretaceous/Tertiary (C/T)-impact destabilised and then profoundly changed the climatic structure of the Earth for Cenozoic times by establishing freezing conditions at the poles via the C/T-dust veil and the subsequent H2O-greenhouse evaporation (polar snow fields/ice caps, see level fall: TP1). It is also suggested that the C/T-impact affected the Earth's mantle (shock-induced phase transitions) and via chain reactions also the core-mantle boundary. This mantle-effect could possibly explain the Laramian plate-tectonic episode (+/- 65 Ma) and reversal T29 R/N, which occurred ~ 150 000 years after the C/T-boundary, as long term impact effects.
The combination of these and the multitude of associated events (c.f. faunal breaks) appear to correlate episodically in the geological past. It is proposed, that these repetitions can be used as a potential approach to narrow the search for impact-traces. Also, more examples of correlations between impact events and their possible effects are needed to ensure that the implications of the C/T-impact are generally valid.

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