Geochemical data (clay mineral, XRF-scanner and biomarker data) for core LC12 sediment record from Blaso, a large, epishelf lake in NW Greenland collected July-August 2017 ...

• Main Authors: Smith, James A., Callard, Louise, Sánchez Montes, Maria Luisa, McClymont, Erin L., Lloyd, Jeremy M., Ehrmann, Werner, Roberts, David, Bentley, Michael J., Jamieson, Stewart S. R., Lane, Timothy P., Darvill, Christopher M.
• Format: Dataset
• Language: English
• Published: NERC EDS UK Polar Data Centre 2022
• Subjects: "EARTH SCIENCE","PALEOCLIMATE","OCEAN/LAKE RECORDS","SEDIMENTS"; 79°N; Greenland; Holocene; epishelf lake; ice shelf history; palaeolimnology; Arctic; Kol’; Station Nord; Ice Shelf; Nordland
• Online Access: https://dx.doi.org/10.5285/5a286921-9031-4abc-b227-79bce58f0640; https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01667

The dataset comprises multi-proxy analyses of sediment core, LC12, extracted from Blaso, a large epishelf lake on the margin of 79 degree N Ice Shelf, NW Greenland in July-August 2017. The data are used to constrain ice shelf dynamics over the last 8500 calibrated years before present (cal. years B.P., where present is A.D. 1950). A 2 m-long sediment core was recovered with a UWITEC KOL 'Kolbenlot' percussion piston corer to a total sediment depth of 5.24. Core LC12: 90 m water depth; 79.5948 ° N, 22.44233 ° E. Geochemical data for the LC12 sediment records consists of clay mineral, XRF-scanner and biomarker data. This project was funded by the Natural Environment Research Council (NERC) through Standard Grant NE/N011228/1. We thank the Alfred Wegner Institute, and particularly Angelika Humbert and Hicham Rafiq, for their significant logistic support through the iGRIFF project. Additional support was provided from Station Nord (Jorgen Skafte), Nordland Air, Air Greenland and the Joint Arctic Command. ... : Prior to analysis sediment samples were treated with 20 % hydrogen peroxide to digest the organic material. Once the organic material has been digested the sample was centrifuged and then 20 ml distilled water plus 2 ml sodium hexametaphosphate was added to defloculate the sample. High-resolution elemental abundances were measured on the split core using a GEOTEK X-ray Fluorescence (MSCL-XRF) at 1 mm resolution. We use elemental ratios Ti/Ca as a proxy for terrigenous flux, while Mn/Fe and Br concentrations provides semi-quantitative information about lake oxygenation (Naeher et al., 2013) and marine organic carbon content (Ziegler et al., 2008) respectively. Ti contents in marine sediments is directly linked to terrigenous (siliciclastic) sediment supply delivered by fluvial and/or aeolian transport processes (Arz et al., 1999; Nace et al., 2014), while Ca concentrations reflect changes in the production of calcium carbonate (CaCO3) by marine plankton (Bahr et al., 2005). High Ti/Ca ratios are indicative of ...