Altered spherules of impact melt and associated relic glass from the K/T boundary sediments in Haiti

David A. Kring, William V. Boynton

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Partially to wholly altered glass spherules produced by impact-induced shock melting have been found in the K/T boundary sediments of Haiti which also contain grains of shocked quartz. The relic glass has an approximately dacitic composition, and although grossly similar in composition to most previously described tektite glasses, it is slightly enriched in Ca and slightly depleted in Si, suggesting the Haitian glass was produced either from a target with a greater fraction of carbonate and anhydrite lithologies and fewer silicate units than the targets from which most other tektites were produced, and/or from one with a significant mafic component. The composition of the glass can best be reconciled with a continental margin terrane, consistent with studies of shocked mineral phases reported elsewhere. The thickness of the deposit in which the impact spherules occur indicates the source of the ejecta was in the proto-Caribbean region.

Original languageEnglish (US)
Pages (from-to)1737-1742
Number of pages6
JournalGeochimica et Cosmochimica Acta
Volume55
Issue number6
DOIs
StatePublished - 1991

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spherule
Sediments
glass
melt
Glass
sediment
Chemical analysis
tektite
Silicates
Quartz
Lithology
Carbonates
anhydrite
ejecta
Minerals
continental margin
terrane
lithology
Melting
Deposits

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Altered spherules of impact melt and associated relic glass from the K/T boundary sediments in Haiti. / Kring, David A.; Boynton, William V.

In: Geochimica et Cosmochimica Acta, Vol. 55, No. 6, 1991, p. 1737-1742.

Research output: Contribution to journalArticle

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