Multiple Ir anomalies in uppermost Triassic to Jurassic-age strata of the Blomidon Formation, Fundy basin, eastern Canada

Platinum-group elements link the end-Triassic mass extinction and the Central Atlantic Magmatic Province

“…3). This is consistent with several independent observations such as multiple levels with elevated Ir concentrations, lack of shocked minerals or spherules in the sediments, and lack of an impact structure of appropriate age and size 33,38,45,49,50 . This is also consistent with elevated Hg (and Hg/TOC) values reported for ETE sediments that have been interpreted as volcanic in origin 7,8,27 (Fig.…”

“…Data from refs. 7,14,16,18,20,28,31,45,49,50,53 . There is also a report of Ir concentrations in the Newark basin 28 (not shown) that is very similar to Ir variations in the Fundy basin.…”

The quest for chron E23r at Partridge Island, Bay of Fundy, Canada: CAMP emplacement postdates the end-Triassic extinction event at the North American craton

“…But this turnover event has been questioned by Cirilli et al (2009), who reported instead a level with enriched fern spores ∼15 cm below the proposed turnover event. Additionally, several horizons with small iridium anomalies in the top 1.5 m. of the red beds have been reported (Tanner and Kyte 2005;Tanner et al 2008).…”

Tracking the redox history and nitrogen cycle in the pelagic Panthalassic deep ocean in the Middle Triassic to Early Jurassic: Insights from redox-sensitive elements and nitrogen isotopes

“…These events were likely linked to major redox changes in the Tethys (McArthur et al, 2008;Pearce et al, 2008;Quan et al, 2008;Bonis et al, 2010;Pálfy and Zajzon, 2012;Richoz et al, 2012;Jaraula et al, 2013;French et al, 2014;Kemp and Izumi, 2014;Kasprak et al, 2015) and Panthalassic Oceans (Hori, 1993;Hori et al, 2007). In addition to sea level changes (e.g., Hallam and Wignall, 1999), anomalous events occurred in both marine and terrestrial environments, such as global-scale intense volcanism and bolide impacts within less than a few million years (Cohen et al, 1999;Coe, 2002, 2007;Olsen et al, 2002aOlsen et al, , 2002bCohen et al, 2004;Tanner and Kyte, 2005;Tanner et al, 2008;Kuroda et al, 2010). The evidence for widespread anoxia in Middle Triassic and Early Jurassic shelf sedimentary rocks has been independently confirmed by multigeochemical proxies and lithological changes (e.g., Jenkyns, 1988;Quan et al, 2008;Bonis et al, 2010;Mazzini et al, 2010;Izumi et al, 2012;Pálfy and Zajzon, 2012;Song et al, 2012;Richoz et al, 2012;Jaraula et al, 2013;French et al, 2014;Kemp and Izumi, 2014;Kasprak et al, 2015).…”