Geochemical results for black shale samples from different Holes of ODP Site 1258, supplement to: Wang, Xiangli; Reinhard, Christopher T; Planavsky, Noah J; Owens, Jeremy D; Lyons, Timothy W; Johnson, Thomas M (2016): Sedimentary chromium isotopic compositions across the Cretaceous OAE2 at Demerara Rise Site 1258. Chemical Geology, 429, 85-92


In order to advance our understanding of the emerging chromium (Cr) isotope system as a paleoredox proxy, we measured the 53Cr/52Cr of black shales deposited before, during, and after Cretaceous Oceanic Anoxic Event 2 (OAE2). We observed a > 1 per mil coherent negative 53Cr/52Cr excursion and significant drawdown in Cr enrichments during OAE2 coincident with a large positive carbon isotope excursion. Our observed negative 53Cr/52Cr excursion during OAE2 is most easily linked to an increase in the ratio of euxinic to reducing conditions. Additional work on other OAE sections is needed to determine the spatial significance of this Cr isotope trend.

Metadata Access
Creator Reinhard, Christopher T;Johnson, Thomas M;Lyons, Timothy W;Planavsky, Noah J;Wang, Xiangli;Owens, Jeremy D
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2017
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Discipline Earth System Research
Spatial Coverage (9 N-9 N,55W-55W)
Temporal Point 2003-01-22T11:59:59Z