Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7176
AuthorsSagnotti, L.* 
Macrì, P.* 
Lucchi, R.* 
Rebesco, M.* 
Camerlenghi, A.* 
TitleA Holocene paleosecular variation record from the northwestern Barents Sea continental margin
Issue Date1-Nov-2011
Series/Report no.11/12 (2011)
DOI10.1029/2011GC003810
URIhttp://hdl.handle.net/2122/7176
KeywordsBarents Sea
Holocene
Storfjorden
geomagnetic paleosecular variation
relative paleointensity
Subject Classification04. Solid Earth::04.05. Geomagnetism::04.05.01. Dynamo theory 
04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 
04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field 
04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism 
AbstractA high‐resolution paleomagnetic and rock magnetic study has been carried out on sediment cores collected in glaciomarine silty‐clay sequences from the continental shelf and slope of the southern Storfjorden trough‐mouth fan, on the northwestern Barents Sea continental margin. The Storfjorden sedimentary system was investigated during the SVAIS and EGLACOM cruises, when 10 gravity cores, with a variable length from 1.03 m to 6.41 m, were retrieved. Accelerator mass spectrometry (AMS) 14C analyses on 24 samples indicate that the cores span a time interval that includes the Holocene, the last deglaciation phase and in some cores the last glacial maximum. The sediments carry a well‐defined characteristic remanent magnetization and have a valuable potential to reconstruct the paleosecular variation (PSV) of the geomagnetic field, including relative paleointensity (RPI) variations. The paleomagnetic data allow reconstruction of past dynamics and amplitude of the geomagnetic field variations at high northern latitudes (75°–76° N). At the same time, the rock magnetic and paleomagnetic data allow a high‐resolution correlation of the sedimentary sequences and a refinement of their preliminary age models. The Holocene PSV and RPI records appear particularly sound, since they are consistent between cores and they can be correlated to the closest regional stacking curves (UK PSV, FENNOSTACK and FENNORPIS) and global geomagnetic model for the last 7 ka (CALS7k.2). The computed amplitude of secular variation is lower than that outlined by some geomagnetic field models, suggesting that it has been almost independent from latitude during the Holocene.
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