Bioavailable 87 Sr/ 86 Sr in European soils: A baseline for provenancing studies

Jurian A. Hoogewerff, Clemens Reimann, Henriette Ueckermann, Robert Frei, Karin M. Frei, Thalita van Aswegen, Claudine Stirling, Malcolm Reid, Aaron Clayton, Anna Ladenberger, Stefano Albanese, Madelen Andersson, Rainer Baritz, A. Bel-Lan, Manfred Birke, Domenico Cicchella, Aleco Demetriades, Benedetto De Vivo, Enrico Dinelli, M. DurišA. Dusza-Dobek, O. A. Eggen, M. Eklund, V. Ernsten, P. Filzmoser, D. M.A. Flight, S. Forrester, M. Fuchs, U. Fügedi, A. Gilucis, M. Gosar, V. Gregorauskiene, W. De Groot, A. Gulan, J. Halamic̀, Edith Haslinger, P. Hayoz, R. Hoffmann, H. Hrvatovic, S. Husnjak, L. Janik, Greg Jordan, M. Kaminari, J. Kirby, J. Kivisilla, V. Klos, F. Krone, P. Kwecko, L. Kuti, Annamaria Lima, J. Locutura, D. P. Lucivjansky, Alan Mann, D. Mackovych, Jörg Matschullat, M. McLaughlin, B. I. Malyuk, R. Maquil, R. G. Meuli, G. Mol, P. Négrel, P. O’Connor, R. K. Oorts, R. T. Ottesen, A. Pasieczna, W. Petersell, S. Pfleiderer, M. Poňavič, S. Pramuka, C. Prazeres, U. Rauch, S. Radusinović, Clemens Reimann, Martiya Sadeghi, I. Salpeteur, R. Scanlon, A. Schedl, Andreas J. Scheib, I. Schoeters, P. Šefčik, E. Sellersjö, F. Skopljak, I. Slaninka, J. M. Soriano-Disla, A. Šorša, T. Stafilov, T. Tarvainen, V. Trendavilov, Paolo Valera, V. Verougstraete, D. Vidojević, A. Zissimos, Z. Zomeni

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Abstract

We present 87 Sr/ 86 Sr isotope ratios for ~1200 selected soil samples, collected by the GEMAS consortium from grazing (Gr) and agricultural (Ap) soils in Europe with the aim to better understand the strontium isotope distribution in the bioavailable fraction of the top-soil and its potential for provenancing applications. Spatial analysis shows that there is a clear distinction between coastal (<100 km) and non-coastal (>100 km) samples in their variance and that this variance is mirrored in the sodium concentration, suggesting an important but highly variable contribution from seaspray. We present two 87 Sr/ 86 Sr maps at 25 km × 25 km scale: one based solely on the measured data using a classical kriging approach and one based on a Random Forest model using complementary GEMAS data to predict the strontium isotope composition at the remaining 3000+ GEMAS sampling locations, including appropriate uncertainty assessment. Using a forensic Bayesian likelihood ratio approach, a tool was developed in R to create provenancing likelihood ratio maps. The maps delineate areas of high and low likelihood and allow investigators to direct their resources to areas of interest. For actual forensic case work either the measured or the modelled data can be used as reference data for the overall distribution of 87 Sr/ 86 Sr values in Europe.

Original languageEnglish
Pages (from-to)1033-1044
Number of pages12
JournalScience of the Total Environment
Volume672
DOIs
Publication statusPublished - 1 Jul 2019

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    Hoogewerff, J. A., Reimann, C., Ueckermann, H., Frei, R., Frei, K. M., van Aswegen, T., Stirling, C., Reid, M., Clayton, A., Ladenberger, A., Albanese, S., Andersson, M., Baritz, R., Bel-Lan, A., Birke, M., Cicchella, D., Demetriades, A., De Vivo, B., Dinelli, E., ... Zomeni, Z. (2019). Bioavailable 87 Sr/ 86 Sr in European soils: A baseline for provenancing studies. Science of the Total Environment, 672, 1033-1044. https://doi.org/10.1016/j.scitotenv.2019.03.387