The rare earth elements (REEs) were measured in pore waters of the Bering Sea sediments using HR-ICP-MS after RE-spec column separation. Site U1345 was drilled during IODP Exp. 323 at the gateway to the Arctic Ocean to a depth of 140 mbsf. This is an area of high biological productivity and the drill site was at a water depth of 1008m in the center of modern oxygen minimum zone [1]. The pore water sampling depth resolution was 10m in Hole A (n=17) and 0.25m in Hole B (n=77). The pore water REE concentrations were higher than sea water. Maximum concentrations were found below the sulfate-methane transition zone (6.5 mbsf) and centered at approximately 8-17 m: e.g. 790 pmol kg (super -1) Nd, 3000 pmol kg (super -1) Yb. The concentrations then decreased toward the bottom. Shale-normalized REE patterns were HREE-enriched at all depths. This pattern has been linked to remineralization of POC and complexation of the HREE with DOC [3]. The HREE-enrichment was most extreme at the depth of maximum REE concentrations. There was a slight MREE bulge in the upper 3m. Ce anomalies were negligible throughout the depth profile. Comparison to other chemical species (shipboard analyses of dissolved Fe, Mn, Ba, phosphate, etc.) will be presented.

West: -179.2813 East: -179.2813 North: 60.0913 South: 60.0913

Expedition: 323

Site: 323-U1345

Provider: SEDIS Publication Catalogue

Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=2012-068514 (c.f. for more detailed metadata)

Data download: application/pdf

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