Wang, Xiangli; Reinhard, Christopher T; Planavsky, Noah J; Owens, Jeremy D; Lyons, Timothy W; Johnson, Thomas M (2017): Geochemical results for black shale samples from different Holes of ODP Site 1258 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.873605, Supplement to: Wang, X et al. (2016): Sedimentary chromium isotopic compositions across the Cretaceous OAE2 at Demerara Rise Site 1258. Chemical Geology, 429, 85-92, https://doi.org/10.1016/j.chemgeo.2016.03.006
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Abstract:
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.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 9.433330 * Median Longitude: -54.733033 * South-bound Latitude: 9.433330 * West-bound Longitude: -54.733310 * North-bound Latitude: 9.433330 * East-bound Longitude: -54.732760
Date/Time Start: 2003-01-22T18:15:00 * Date/Time End: 2003-10-28T10:10:00
Minimum Elevation: -3192.2 m * Maximum Elevation: -3192.2 m
Event(s):
207-1258A * Latitude: 9.433330 * Longitude: -54.733310 * Date/Time Start: 2003-01-22T18:15:00 * Date/Time End: 2003-01-25T10:10:00 * Elevation: -3192.2 m * Penetration: 447.5 m * Recovery: 375.46 m * Location: South Atlantic Ocean * Campaign: Leg207 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 50 cores; 447.5 m cored; 0 m drilled; 83.9 % recovery
207-1258B * Latitude: 9.433330 * Longitude: -54.733030 * Date/Time Start: 2003-01-25T10:10:00 * Date/Time End: 2003-10-28T10:10:00 * Elevation: -3192.2 m * Penetration: 460.9 m * Recovery: 346.13 m * Location: South Atlantic Ocean * Campaign: Leg207 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 57 cores; 453.9 m cored; 7 m drilled; 76.3 % recovery
207-1258C * Latitude: 9.433330 * Longitude: -54.732760 * Date/Time Start: 2003-01-28T10:10:00 * Date/Time End: 2003-02-01T07:50:00 * Elevation: -3192.2 m * Penetration: 485 m * Recovery: 161.08 m * Location: South Atlantic Ocean * Campaign: Leg207 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 34 cores; 215.2 m cored; 269.8 m drilled; 74.9 % recovery
Comment:
Age model is constructed using a sedimentation rate of 0.9 cm/kyr (Sageman et al., 2006 (doi:10.1130/G22074.1) and MacLeod et al., 2008 (doi:10.1130/G24999A.1)). The authigenic fraction is estimated using crustal Cr/Ti values of 0.03 (Methods section).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Wang, Xiangli | |||
| 2 | Sample code/label | Sample label | Wang, Xiangli | |||
| 3 | Depth, composite | Depth comp | mcd | Wang, Xiangli | ||
| 4 | AGE | Age | ka BP | Wang, Xiangli | Geocode | |
| 5 | Carbon, organic, total | TOC | % | Wang, Xiangli | ICP-MS, Agilent 7500-ce | |
| 6 | Chromium | Cr | mg/kg | Wang, Xiangli | ICP-MS, Agilent 7500-ce | |
| 7 | Titanium | Ti | mg/kg | Wang, Xiangli | ICP-MS, Agilent 7500-ce | |
| 8 | Molybdenum | Mo | mg/kg | Wang, Xiangli | ICP-MS, Agilent 7500-ce | |
| 9 | δ53Cr | δ53Cr | ‰ | Wang, Xiangli | bulk | |
| 10 | δ53Cr | δ53Cr | ‰ | Wang, Xiangli | authigenic fraction | |
| 11 | Fraction | Fraction | Wang, Xiangli | authigenic |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
261 data points