K/T spherules from Haiti and Wyoming: Origin, diagenesis, and similarity to some microtektites

Details K/T spherules from Haiti and Wyoming: Origin, diagenesis, and similarity to some microtektites K/T spherules from Haiti and Wyoming: Origin, diagenesis, and similarity to some microtektites

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..145b&link_type=abstract

In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 145-146 (SEE N94-12015 01-91)

Computer Science

Cretaceous-Tertiary Boundary, Ejecta, Glass, Micrometeorites, Spherules, Tektites, Andesite, Haiti, Meteoritic Composition, Scalloping, Wyoming

Scientific paper

Spherules with relict glass cores in the K/T boundary bed of Haiti allow for a comparison of these bodies with hollow goyazite shells in the K/T boundary claystone of Wyoming and with younger microtektites of the Ivory Coast strewn field. Samples of the Haitian beds from undisturbed sections at Beloc, as determined by Jehanno et al., contain both hollow shells and relict glass cores rimmed by palagonite that has been partially converted to smectite. These palagonite rims developed from hydration zones formed when hot, splash-form droplets of andesitic impact glass were deposited into water. Mutual collisions between these droplets in the ejecta curtain may have formed point-source stresses on their surfaces. Initiation of hydration would be facilitated at these surface stress points and propagated radially into the glass. The inner surface of these merged hemispherical fronts appears mammillary, which is reflected as scalloping in Haitian relict glass cores.

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