Late Eocene impact microspherules - Stratigraphy, age and geochemistry

Details Late Eocene impact microspherules - Stratigraphy, age and geochemistry Late Eocene impact microspherules - Stratigraphy, age and geochemistry

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987metic..22...25k&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 22, March 31, 1987, p. 25-60. Research supported by the U.S.-Spain Joint Committee for Scient

Computer Science

45

Geochemistry, Micrometeorites, Ocean Bottom, Spherules, Stratigraphy, Carbon 13, Carbonates, Iridium, Oxygen 18, Pacific Ocean, Spherules, Stratigraphy, Age, Geochemistry, Samples, Terrestrial, Maps, Layers, Sediments, Strewnfields, Microtektites, Extinction, Impacts, Field Studies, Procedure, Data, Dating Methods, Oxides, Silicon Dioxide, Crystals, Iridium, Calcium Carbonate, Oxygen, Photomicrographs

Scientific paper

The stratigraphy, faunal changes, and geochemistry of deep-sea sediments associated with late Eocene microtektite and microspherule layers are reported. Microprobe analyses of major element compositions of microspherules show that, although there is some compositional overlap in all three late Eocene layers as well as with the Pleistocene Australasian and Ivory Coast microtektites, each microspherule population has characteristic compositional features. All three microspherule layers are associated with decreased carbonate, possibly due to a sudden productivity change, increased dissolution as a result of sea-level and climate fluctuations, or impact events. A discovery of microtektites in the Gl. cerroazulensis Zone off the New Jersey coast extends the North American strewn field from the Caribbean to the northwest Atlantic.

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