Magnesioferrite spinel in Cretaceous/Tertiary boundary sediments of the Pacific basin: Remnants of hot, early ejecta from the Chicxulub impact?

Details Magnesioferrite spinel in Cretaceous/Tertiary boundary sediments of the Pacific basin: Remnants of hot, early ejecta from the Chicxulub impact? Magnesioferrite spinel in Cretaceous/Tertiary boundary sediments of the Pacific basin: Remnants of hot, early ejecta from the Chicxulub impact?

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.132..113k&link_type=abstract

Earth and Planetary Science Letters, vol. 132, Issue 1-4, pp.113-127

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23

Scientific paper

Magnesioferrite spinel in sediments from six ( ) boundary sites in the Pacific basin are found to have relatively uniform compositions and textures. They typically have much higher MgO, Al 2 O 3 , and than spinel from boundaries in western Europe and the South Atlantic or in meteor ablation debris. These compositions are similar to those found in a few grains from the boundary at ODP Site 761 (eastern Indian Ocean) and in spherules from a late Pliocene impact. Pacific spinel commonly exhibit unique textures with large, porous, anhedral grains which we believe reflect a myrmekitic intergrowth with another phase that has been destroyed by diagenetic alteration. A prime candidate for this other phase is Ni-rich periclase (Mg,Ni,Fe)O, a mineral that has been observed as trace inclusions in several spinel grains from Pacific Ocean DSDP Sites 577 and 596. The strewnfield for the Pacific spinel extends over > 5% of the Earth's surface, but it could be a much larger area. These spinel must have crystallized from silicate liquids produced by a large impact event. If their source is the impact that made the Chicxulub structure on the Yucatán Peninsula, Mexico, then there is a clear compositional asymmetry to the distribution of this component of the ejecta. We speculate that a possible cause of this asymmetry could be a low-angle impact. If the projectile came in from the east, the vapor cloud would deposit the earliest, hottest materials over the Pacific basin.

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