Palaeomagnetic investigation of three sediment cores from the Chukchi and Beaufort Sea margin

Palaeomagnetic analyses reveal that the sediments under study are characterized by low-coercivity ferrimagnetic minerals (magnetite), mostly in the pseudo-single domain grain-size range, and by a strong, stable, well-defined remanent magnetization (MAD <5°).

Age models for these sediment cores were constrained by comparing their palaeomagnetic secular variations (inclination, declination and relative palaeointensity) with previously published and independently dated sedimentary marine records from the study area. The magnetostratigraphical age models were verified by AMS radiocarbon dating tie points, tephrochronology and 210Pb-based sedimentation rate estimate. The analysed cores 01JPC, 03PC and 02PC span c. 6000, 10 500 and 13 500 cal. a BP, respectively.