Late Eocene North American microtektites and clinopyroxene-bearing spherules

Details Late Eocene North American microtektites and clinopyroxene-bearing spherules Late Eocene North American microtektites and clinopyroxene-bearing spherules

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lpsc...16..175g&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,

Mathematics

Logic

11

Geochronology, Pyroxenes, Spherules, Tektites, Abundance, Biological Evolution, Impact, Iridium, Stratigraphy, Vertical Distribution, Microtektites, Clinopyroxene, Spherules, Silicate, Earth, Formation, Origin, Impacts, Layers, Strewn Fields, Age, Elements, Composition, Isotopes, Samples, Terrestrial, Analysis, Comparisons

Scientific paper

The geographic distribution, age, appearance, petrography, and composition of the late Eocene microtektites and clinopyroxene-bearing (cpx) spherules are discussed in detail. Their stratigraphic relationship to each other and to the extinction of several radiolarian taxa and to an iridium anomaly is examined. The results support the thesis that the cpx spherules, like the North American microtektites, were probably formed by an impact event. There, thus, appears to have been two impact events in the late Eocene. The first produced the cpx spherule layer, which is coincident with the iridium anomaly and appears to be synchronous with the extinction of several radiolarian species. The second impact, about 10,000-20,000 years later, produced the North American tektites and microtektites.

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