An iridium anomaly in the middle-lower Jurassic of the Venetian region, Northern Italy

Details An iridium anomaly in the middle-lower Jurassic of the Venetian region, Northern Italy An iridium anomaly in the middle-lower Jurassic of the Venetian region, Northern Italy

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91..259r&link_type=abstract

(Lunar and Planetary Institute, NASA, AAS, et al., Lunar and Planetary Science Conference, 17th, Houston, TX, Mar. 17-21, 1986)

Physics

6

Alps Mountains (Europe), Anomalies, Geochemistry, Geochronology, Iridium, Asteroids, Earth Crust, Impact Melts, Italy, Sediments

Scientific paper

A significant iridium enrichment has been found in a Jurassic marine sequence, about 180 million years old, outcropping in the Alps of the Venetian region. The maximum iridium concentration of 3.2±0.2 ng g-1 occurs in a brown crust 2 - 3 mm thick, containing essentially iron hydroxide. This crust, characterized by a nearly total absence of detritic components, lies on top of upper Lias limestones, and is overlaid with Bajocian-Bathonian limestones. The origin of the Ir anomaly is not clearly understood yet but could be explained by either a drop in the sedimentation rate resulting in the concentration within a thin sediment layer of the normally infalling cosmic dust and/or by an increase of cosmic material infall following an asteroid or comet impact(s).

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