Late Eocene microkrystites and microtektites at Maud Rise (ODP Hole 689B; Southern Ocean) suggest a global extension of the ~ 35.5 MA Pacific impact ejecta strewn field.

Details Late Eocene microkrystites and microtektites at Maud Rise (ODP Hole 689B; Southern Ocean) suggest a global extension of the ~ 35.5 MA Pacific impact ejecta strewn field. Late Eocene microkrystites and microtektites at Maud Rise (ODP Hole 689B; Southern Ocean) suggest a global extension of the ~ 35.5 MA Pacific impact ejecta strewn field.

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999m%26ps...34..747v&link_type=abstract

Meteoritics & Planetary Science, vol. 34, no. 5, pp. 747-755 (1999).

Computer Science

11

Scientific paper

Late Eocene microtektites and microkrystites recovered from ODP Hole 689B at Maud Rise (Southern Ocean) are stratigraphically and geochemically compared to spherules from the North American- and Pacific strewn fields, and to devitrified spherules from the Eocene-Oligocene GSSP section in Massignano (Italy). ODP 689B microkrystites compare well to the Pacific strewn field microkrystites, suggesting that the geographic extent of the Pacific strewn field was much larger than previously documented. The elemental composition of microtektites of ODP Hole 689B is comparable to tektites of the North American strewn field. Their 87Sr/86Sr ratio, however, is different. We tentatively interpret this to reflect geochemical heterogeneity within the North American strewn field, but can not exclude the option that the chemical discrepancies result from the existence of a third late Eocene impact site.

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