Formation of spinels in cosmic objects during atmospheric entry - A clue to the Cretaceous-Tertiary boundary event

Details Formation of spinels in cosmic objects during atmospheric entry - A clue to the Cretaceous-Tertiary boundary event Formation of spinels in cosmic objects during atmospheric entry - A clue to the Cretaceous-Tertiary boundary event

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.108..181r&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 108, no. 4, Feb. 1992, p. 181-190. Research supported by CEA and CNRS

Computer Science

50

Atmospheric Entry, Cretaceous-Tertiary Boundary, Meteoritic Composition, Meteoritic Microstructures, Spinel, Crystal Structure, Meteorite Collisions, Nickel Compounds, Oxidation

Scientific paper

Magnetic spinels produced by oxidation of extraterrestrial objects in the atmosphere have a composition distinct from terrestrial spinels. They are characterized by a high iron oxidation state, arising from crystallization under high oxygen fugacities, and a high nickel concentration due to the relatively high abundance of this element in extraterrestrial material. The iron oxidation state increased from micrometeorites, to meteoroid ablation material and to impact-generated products. This reflects a progressive increase of the oxygen fugacity, corresponding to decreasing altitudes of crytallization. Spinels found at the Cretaceous-Tertiary boundary are similar to those that crystallized from meteoroid ablation material and impact-generated products, supporting the view that a collisional event did occur at the end of the Cretaceous.

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