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Wien, Katharina; Wissmann, D; Kölling, Martin; Schulz, Horst D (2005): Geochemistry of bulk sediment from the Cape Basin. PANGAEA,, Supplement to: Wien, K et al. (2005): Fast application of X-ray fluorescence spectrometry aboard ship: how good is the portable new Spectro Xepos analyser? Geo-Marine Letters, 25(4), 248-264,

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A technique for onsite application of X-ray fluorescence (XRF) spectrometry to samples from sediment cores aboard a research vessel was developed and tested. The method is sufficiently simple, precise, and fast to be used routinely for high-resolution analyses of depth profiles as well as surface samples. Analyses were performed with the compact high-performance energy-dispersive polarisation X-ray fluorescence (EDPXRF) analyser Spectro Xepos. Contents of the elements Si, Ti, Al, Fe, Mn, Mg, Ca, K, Sr, Ba, Rb, Cu, Ni, Zn, P, S, Cl and Br were simultaneously determined on 200-225 samples of each core within 24 h of recovery. This study presents a description of the employed shipboard preparation and analysis technique, along with some example data. We show land-based datasets that support our decisions to use powder samples and to reduce the original measuring time for onboard analyses. We demonstrate how well the results from shipboard measurements for the various elements compare with the land-based findings. The onboard geochemical data enabled us to establish an element stratigraphy already during the cruise. Correlation of iron, calcium and silicon enrichment trends with an older reference core provided an age model for the newly retrieved cores. The Spectro Xepos instrument performed without any analytical and technical difficulties which could have been caused by rougher weather conditions or continuous movement and vibration of the research vessel. By now, this XRF technique has been applied during three RV Meteor cruises to approximately 5,000 Late Quaternary sediment samples from altogether 23 gravity cores, 25 multicorer cores and two box cores from the eastern South Atlantic off South Africa/Namibia and the eastern Atlantic off NW Africa.
Related to:
Wien, Katharina (2006): Element stratigraphy and age models for pelagites and gravity mass flow deposits based on shipboard xrf analysis. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 248, 100 pp, urn:nbn:de:gbv:46-ep000106803
Median Latitude: -19.916708 * Median Longitude: 8.110375 * South-bound Latitude: -34.774667 * West-bound Longitude: -18.758500 * North-bound Latitude: 18.504333 * East-bound Longitude: 17.698667
Date/Time Start: 2003-01-21T06:29:00 * Date/Time End: 2003-04-22T16:27:00
GeoB8301-5 * Latitude: -34.774667 * Longitude: 17.698667 * Date/Time: 2003-01-21T06:29:00 * Elevation: -1941.0 m * Recovery: 0.22 m * Campaign: M57/1 * Basis: Meteor (1986) * Device: MultiCorer (MUC) * Comment: 2 small tubes empty. BWT: 9°C. BWS for d13C and d18O analysis
GeoB8303-5 * Latitude: -34.261167 * Longitude: 16.784833 * Date/Time: 2003-01-22T09:56:00 * Elevation: -3447.0 m * Recovery: 0.21 m * Campaign: M57/1 * Basis: Meteor (1986) * Device: MultiCorer (MUC) * Comment: BWT: 8 °C. BWS for d13C and d18O analysis
GeoB8331-4 * Latitude: -29.135333 * Longitude: 16.716500 * Date/Time: 2003-01-31T11:40:00 * Elevation: -97.0 m * Recovery: 8.87 m * Campaign: M57/1 * Basis: Meteor (1986) * Device: Gravity corer (Kiel type) (SL) * Comment: see core description
Further relevant data see Wien et al. (2005) datasets: doi:10.1594/PANGAEA.711655
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