Mid-Brunhes magnetic excursions in marine isotope stages 9, 13, 14, and 15 (286, 495, 540, and 590 ka) at North Atlantic IODP Sites U1302/3, U1305, and U1306

Online Access: Get full text
doi: 10.1002/2016GC006626
Author(s): Channell, J. E. T.
Author Affiliation(s): Primary:
University of Florida, Department of Geological Sciences, Gainesville, FL, United States
Volume Title: Geochemistry, Geophysics, Geosystems - G<sup>3</sup>
Source: Geochemistry, Geophysics, Geosystems - G>3`, 18(2), p.473-487. Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027
Note: In English. 57 refs.; illus., incl. 1 table, sketch map
Summary: Integrated Ocean Drilling Program (IODP) Site U1302/3 (Orphan Knoll, off Newfoundland) recorded magnetic excursions in marine isotope stages (MIS) 9a (at 286 ka) and 13a (at 495 ka). Sites U1306 and U1305 (Eirik Drift, off SE Greenland) record excursions in MIS 14a/b (at 540 ka) and 15b/c (at 590 ka). In the excursion intervals, magnetic measurements of continuous "u-channel" samples from multiple holes within site are augmented by measurements of cubic (8 cm3) discrete samples. The excursions lie in relative paleointensity (RPI) minima at each site and in RPI reference stacks, and correspond to dated intervals of 10Be overproduction in other deep-sea sediment records. Although observed at multiple holes at each site, and from u-channel and discrete samples, the excursions are not observed at all three sites, and often at only one of the three sites. Sporadic recording of these magnetic excursions, and excursions in general, is attributed to a combination of filtering by the process of acquisition of detrital remanent magnetization (DRM), postdepositional overprint of weak excursion magnetizations, the millennial or even centennial duration of directional excursions, and nonuniform sedimentation rates at these timescales in North Atlantic sediment drifts. Abstract Copyright (2017), . American Geophysical Union. All Rights Reserved.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; 24 Surficial Geology, Quaternary Geology; Alkaline earth metals; Arctic region; Atlantic Ocean; Be-10; Bermuda Rise; Beryllium; Brunhes Chron; Canada; Cenozoic; Eastern Canada; Expedition 303; Expeditions 303/306; Greenland; IODP Site U1302; IODP Site U1303; IODP Site U1304; IODP Site U1305; IODP Site U1306; Integrated Ocean Drilling Program; Isotopes; Leg 162; Leg 172; MIS 13; MIS 14; MIS 15; MIS 9; Magnetic excursions; Magnetic properties; Magnetization; Metals; Newfoundland; Newfoundland and Labrador; North Atlantic; Northeast Atlantic; Northwest Atlantic; ODP Site 1063; ODP Site 980; ODP Site 983; ODP Site 984; Ocean Drilling Program; Orphan Knoll; Paleomagnetism; Quaternary; Radioactive isotopes; Remanent magnetization; Reykjanes Ridge; Rockall Bank; South Greenland; Upper Quaternary
Coordinates: N501000 N501000 W0453800 W0453800
N501200 N501200 W0454100 W0454100
N572800 N572900 W0483200 W0483200
N581400 N581400 W0453800 W0453900
Record ID: 2017041429
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom, Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union