Rock magnetic signature of the Cretaceous-Tertiary boundary

Details Rock magnetic signature of the Cretaceous-Tertiary boundary Rock magnetic signature of the Cretaceous-Tertiary boundary

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14.1083w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, Nov. 1987, p. 1083-1086. NSF-supported research.

Other

10

Magnetic Anomalies, Magnetic Signatures, Paleomagnetism, Sedimentary Rocks, Crystal Structure, Magnetic Measurement

Scientific paper

A nondestructive magnetic method is used in a detailed study of black magnetic microspherules extracted from the Cretaceous-Tertiary boundary at Petriccio, Italy. A rock magnetic characterization by hysteresis, isothermal remanent magnetization acquisition, demagnetization, and thermomagnetic measurements identifies the magnetic minerals in the microspherules as ferrites with a near magnetite composition and soft magnetic behavior. It is suggested that further susceptibility studies on samples from other locations around the world may reveal a global distribution pattern and indicate the site(s) at which catastrophic impact took place.

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