The stratigraphic distribution of Ni-rich spinels in Cretaceous-Tertiary boundary rocks at EL Kef (Tunisia), Caravaca (Spain) and Hole 761 (Leg 122)

Details The stratigraphic distribution of Ni-rich spinels in Cretaceous-Tertiary boundary rocks at EL Kef (Tunisia), Caravaca (Spain) and Hole 761 (Leg 122) The stratigraphic distribution of Ni-rich spinels in Cretaceous-Tertiary boundary rocks at EL Kef (Tunisia), Caravaca (Spain) and Hole 761 (Leg 122)

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.107..715r&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 107, no. 3-4, Dec. 1991, p. 715-721.

Mathematics

Logic

28

Cretaceous-Tertiary Boundary, Meteorite Collisions, Nickel, Spinel, Stratigraphy, Ablation, Extinction, Geology, Iridium, Mineralogy

Scientific paper

The stratigraphic distributions of Ni-rich spinels at three widely scattered K-T sites are presented, and the implications in the present understanding of the K-T boundary event are discussed. The various Ni-rich spinel and carbonate distributions are interpreted as the result of an infall of extraterrestrial material occurring in close coincidence with the global mass extinctions. The duration of the pulse was very brief on the geological time scale, with upper limits ranging from 100 to 3000 years. Long-duration estimates (50 ka to 1 Ma), derived from the distribution of iridium, and probably other chemical markers, are found to be misleading and meaningless because of disturbance by postdepositional chemical processes. The volcanic crisis associated with Deccan Trap formation, whose duration greatly exceeds even the present upper limit of 3000 yr, should be rejected. Strong evidence for a collisional event occurring at the close of the Cretaceous is provided.

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