FN Archimer Export Format PT J TI The influence of high-latitude flux lobes on the Holocene paleomagnetic record of IODP Site U1305 and the northern North Atlantic BT AF STONER, Joseph S. CHANNELL, James E. T. MAZAUD, Alain STRANO, Sarah E. XUAN, Chuang AS 1:1;2:2;3:3;4:1;5:1; FF 1:;2:;3:;4:;5:; C1 Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA. Univ Florida, Dept Geol Sci, Gainesville, FL USA. Domaine CNRS, LSCE, CNRS, Gif Sur Yvette, France. C2 UNIV OREGON STATE, USA UNIV FLORIDA, USA CNRS, FRANCE IF 3.054 TC 28 UR https://archimer.ifremer.fr/doc/00264/37480/36500.pdf https://archimer.ifremer.fr/doc/00264/37480/36501.pdf https://archimer.ifremer.fr/doc/00264/37480/36502.pdf https://archimer.ifremer.fr/doc/00264/37480/36503.pdf LA English DT Article CR IMAGES V LEG 1-MD114 IMAGES V LEG 4-MD114 MD 132 / P.I.C.A.S.S.O.-IMAGES11 BO Marion Dufresne DE ;paleomagnetism;North Atlantic;paleointensity AB Paleomagnetic analysis and radiocarbon dating of an expanded Holocene deep-sea sediment sequence recovered by Integrated Ocean Drilling Program (IODP) Expedition 303 from Labrador Sea Site U1305 (Lat.: 57 degrees 28.5 N, Long.: 48 degrees 31.8 W, water depth 3459 m) provides insights into mechanisms that drive both paleomagnetic secular variation (PSV) and magnetization acquisition in deep-sea sediments. Seventeen radiocarbon dates on planktonic foraminifera define postglacial (ca. 8 ka) sedimentation rates as ranging from 35 to > 90 cm/kyr. Alternating field (AF) demagnetization of u-channel samples show that these homogeneous sediments preserve a strong, stable, and consistently well-defined component magnetization. Normalized remanence records pass reliability criteria for relative paleointensity (RPI) estimates. Assuming that the age of magnetization is most accurately defined by well dated PSV records with the highest sedimentation rates, allows us to estimate and correct for temporal offsets at Site U1305 interpreted to result from postdepositional remanence acquisition at a depth of similar to 20 cm. Comparisons indicate that the northern North Atlantic PSV and RPI records are more consistent with European than North American records, and the evolution of virtual geomagnetic poles (VGP) are temporally and longitudinally similar to global reconstructions, though with much larger latitudinal variation. The largest deviations from a geocentric axial dipole (GAD) are observed during times of the highest intensities, in contrast to the usual assumption. These observations are consistent with the idea that PSV in the North Atlantic and elsewhere during the Holocene results from temporal oscillations of high-latitude flux concentrations at a few recurrent locations. PY 2013 PD OCT SO Geochemistry Geophysics Geosystems SN 1525-2027 PU Amer Geophysical Union VL 14 IS 10 UT 000330531400042 BP 4623 EP 4646 DI 10.1002/ggge.20272 ID 37480 ER EF