Shocked Quartz, Ir, Sr, and OS Anomalies Found in the Late Eocene at Massignano (Ancona, Italy): Clear Evidence of a Bolide Impact

Details Shocked Quartz, Ir, Sr, and OS Anomalies Found in the Late Eocene at Massignano (Ancona, Italy): Clear Evidence of a Bolide Impact Shocked Quartz, Ir, Sr, and OS Anomalies Found in the Late Eocene at Massignano (Ancona, Italy): Clear Evidence of a Bolide Impact

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..239c&link_type=abstract

Lunar and Planetary Science, volume 27, page 239

Physics

1

Eocene, Impacts, Massignano, Quartz: Shocked

Scientific paper

Shock metamorphosed quartz grains coincident with a positive Ir anomaly of 199 +/- 19 ppb, a positive 87Sr/88Sr anomaly, and a negative 1870s/1880s anomaly of about 0.35 have been found in a marry layer of the Late Eocene Scaglia Variegata formation at Massignano (Ancona), which clearly indicates a large impact with an interpolated radiometric age of 35.7 +/- 0.4 Ma. The Popigai crater (Siberia, ~ 100 km diameter) and the recently discovered Chesapeake Bay Crater (Eastern U. S., ~80 km diameter) are the only known giant craters from the Late Eocene and are prime candidates for the event that distributed the shocked quartz and geochemical anomalies found at Massignano. Although the Middle and Late Eocene are characterized by significant stepwise extinctions, the only evidence of a biotic response at Massignano to an impact is a cooler water shift in the dinocyst assemblage associated with the impact layer. Therefore the effects of the impact on this region of the Late Eocene Tethys appears mild, and the global ramification s of the Late Eocene impacts on climate and life remains unclear. However, the tight age control of the Massignano impact layer presents a correlation potential that is a critical step in our understanding of the Late Eocene impact scenario.

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