Spofforth, David J A; Pälike, Heiko; Green, Darryl R H (2008): Paleogene record of elemental concentrations in sediments from the Arctic Ocean obtained by XRF analyses. PANGAEA, https://doi.org/10.1594/PANGAEA.695311, Supplement to: Spofforth, DJA et al. (2008): Paleogene record of elemental concentrations in sediments from the Arctic Ocean obtained by XRF analyses. Paleoceanography, 23(1), PA1S09, https://doi.org/10.1029/2007PA001489
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We present a high-resolution X-ray fluorescence (XRF) core scanner record for the expanded middle Eocene section from Integrated Ocean Drilling Program (IODP) Expedition 302 (ACEX) drilled on the Lomonosov Ridge, central Arctic Ocean. The division of the middle Eocene into two units (subunit 1/6 and unit 2) is seen in the cyclical behavior of the elements as well as the changing interelemental correlations and their relationship to physical property measurements of bulk sediment. Al, Ti, and K strongly correlate throughout the record, while the behavior of Fe, Mn, and Si is more complex. Utilizing sediment geochemistry calibration to ground truth the XRF data, we suggest the middle Eocene Arctic Ocean was predominately euxinic, although periodic oxygenation of bottom waters must have occurred during unit 2 (49.7-45.4 Ma). Initially, the sediments are rich in biogenic silica (unit 2), but there is a pronounced shift to terrigenous dominated sediment accumulation in subunit 1/6. We report changes in the elemental concentrations of these elements and investigate the relationship between Fe content and pyrite. Additionally, we explore the potential change in paleoenvironmental conditions across the unit boundary.
Median Latitude: 87.893880 * Median Longitude: 137.771180 * South-bound Latitude: 87.866580 * West-bound Longitude: 136.177350 * North-bound Latitude: 87.921180 * East-bound Longitude: 139.365010
Date/Time Start: 2004-08-19T00:00:00 * Date/Time End: 2004-08-27T00:00:00
302-M0002A (ACEX-M2A) * Latitude: 87.921180 * Longitude: 139.365010 * Date/Time: 2004-08-19T00:00:00 * Elevation: -1209.0 m * Penetration: 270.1 m * Recovery: 214.68 m * Location: Arctic Ocean * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: Vidar Viking * Device: Drilling/drill rig (DRILL)
302-M0004A (ACEX-M4A) * Latitude: 87.866580 * Longitude: 136.177350 * Date/Time: 2004-08-27T00:00:00 * Elevation: -1287.9 m * Penetration: 427.9 m * Recovery: 85.91 m * Location: Arctic Ocean * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: Vidar Viking * Device: Drilling/drill rig (DRILL)