Geochemical results for black shale samples from different Holes of ODP Site 1258

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 sig...

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Bibliographic Details
Main Authors: Wang, Xiangli, Reinhard, Christopher T, Planavsky, Noah J, Owens, Jeremy D, Lyons, Timothy W, Johnson, Thomas M
Format: Dataset
Language:English
Published: PANGAEA 2017
Subjects:
207-1258A
207-1258B
207-1258C
AGE
Carbon
organic
total
Chromium
Depth
composite
DRILL
Drilling/drill rig
Event label
Fraction
ICP-MS
Agilent 7500-ce
Joides Resolution
Leg207
Molybdenum
North Atlantic Ocean
Ocean Drilling Program
ODP
Sample code/label
Titanium
δ53Cr
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.873605
https://doi.org/10.1594/PANGAEA.873605
Description
Summary: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.

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