Palaeomagnetism for chronologies of recent alpine lake sediments: successes and limits

Crouzet, C.; Wilhelm, B.; Sabatier, P.; Demory, F.; Thouveny, N.; Pignol, C.; Reyss, J.-L.; Magand, O.; Jeltsch-Thömmes, A.; Bajard, M.; Augustin, L.; Arnaud, F. (2019). Palaeomagnetism for chronologies of recent alpine lake sediments: successes and limits. Journal of Paleolimnology, 62(3), pp. 259-278. Springer 10.1007/s10933-019-00087-z

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Chronologies of lake-sediment records covering the last centuries to millennia are usually based on both short-lived radio nuclides and radio carbon dating. However, beyond the range of short-lived radio nuclides, age model accuracy often suffers from large radio carbon uncertainties. For high-altitude records, this issue is even more prominent as terrestrial plant fragments for radio carbon dating are often lacking due to the sparse vegetation in such environments. In this study, we evaluate the potential of the geomagnetic field secular variations as a complementary tool to establish more robust age–depth relationships. Our palaeomagnetic study, applied to five high-altitude lakes from the western European Alps, first shows that recent unconsolidated sediments can carry stable remanent magnetization. The analysis of the magnetic parameters indicates that low-coercivity.

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