Deschamps, Charles-Edouard; St-Onge, Guillaume; Montero-Serrano, Jean-Carlos; Polyak, Leonid (2017): Palaeomagnetic investigation of three sediment cores from the Chukchi and Beaufort Sea margin [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.884466, Supplement to: Deschamps, Pierre; St-Onge, Guillaume; Montero-Serrano, Jean-Carlos; Polyak, Leonid (2017): Chronostratigraphy and spatial distribution of magnetic sediments in the Chukchi and Beaufort seas since the last deglaciation. Boreas, https://doi.org/10.1111/bor.12296
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Abstract:
Palaeomagnetic investigation of three sediment cores from the Chukchi and Beaufort Sea margins was performed to better constrain the regional chronostratigraphy and to gain insights into sediment magnetic properties at the North American Arctic margin during the Holocene and the preceding deglaciation. 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. The estimated sedimentation rates were stable and relatively high since the deglaciation in cores 01JPC (60 cm ka-1) and 03PC (40-70 cm ka-1). Core 02PC shows much lower Holocene sedimentation rates with a strong decrease after the deglaciation from ~60 to 10-20 cm ka-1. Overall, this study illustrates the usefulness of palaeomagnetism to improve the dating of late Quaternary sedimentary records in the Arctic Ocean.
Coverage:
Median Latitude: 71.686667 * Median Longitude: -143.176667 * South-bound Latitude: 70.550000 * West-bound Longitude: -158.420000 * North-bound Latitude: 72.900000 * East-bound Longitude: -133.570000
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Deschamps, C-E; St-Onge, G; Montero-Serrano, J-C et al. (2017): Palaeomagnetic investigation of sediment core AMD0214-02PC collected during the ArcticNet expedition in 2014. https://doi.org/10.1594/PANGAEA.884463
- Deschamps, C-E; St-Onge, G; Montero-Serrano, J-C et al. (2017): Palaeomagnetic investigation of sediment core AMD0214-03PC collected during the ArcticNet expedition in 2014. https://doi.org/10.1594/PANGAEA.884464
- Deschamps, C-E; St-Onge, G; Montero-Serrano, J-C et al. (2017): Palaeomagnetic investigation of sediment core HLY0501-01JPC from the Chukchi-Alaskan margin during the Healy-Oden Trans-Arctic Expedition in 2005. https://doi.org/10.1594/PANGAEA.884465