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

Sep 1986

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

Journal of Geophysical Research, Volume 91, Issue B13, p. E259-E262

Physics

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 understook 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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