Paleomagnetic field variability and chronostratigraphy of Brunhes-Chron deep-sea sediments from the Bering Sea: IODP Expedition 323

IODP Expedition 323 recovered six complete and replicate records of Brunhes-Chron paleomagnetic field variability (0–780,000 years BP) in 2820m core depth below sea floor (CSF) of deep-sea sediments. On shipboard, we made more than 220,000 paleomagnetic measurements on the recovered sediments. Since...

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Bibliographic Details
Published in:Deep-sea research. Part II, Topical studies in oceanography Topical studies in oceanography, 2016-03, Vol.125-126, p.107-116
Main Authors: Lund, Steve, Stoner, Joseph, Okada, Makoto, Mortazavi, Emily
Format: Article
Language:English
Subjects:
Correlation
Dating
Deep sea
Excursions
Expeditions
Magnetic fields
Magnetic stratigraphy
Marine
Oceanography
Paleomagnetic secular variation
Paleomagnetism
Rock
Sediments
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Summary:IODP Expedition 323 recovered six complete and replicate records of Brunhes-Chron paleomagnetic field variability (0–780,000 years BP) in 2820m core depth below sea floor (CSF) of deep-sea sediments. On shipboard, we made more than 220,000 paleomagnetic measurements on the recovered sediments. Since then, we have u-channel sampled more than 300m of Brunhes Chron sediments to corroborate our shipboard measurements and improve our paleomagnetic and rock magnetic understanding of these sediments. Several intervals of distinctive paleomagnetic secular variation (PSV) have been identified that appear to be correlatable among sites 1343, 1344, and 1345. One magnetic field excursion is recorded in sediments of sites 1339, 1343, 1344, and 1345. We identify this to be excursion 7α/Iceland Basin Event (192,000 years BP), which is also seen in the high-latitude North Atlantic Ocean (Channell et al., 1997). We have verified in u-channels the placement of the Brunhes/Matuyama boundary (780,000 years BP) at sites 1341 and 1343. Finally, we have developed a medium-quality relative paleointensity record for these sediments that is correlatable among the sites, even though it is still biased by large-amplitude environmental variability. On the basis of these observations we have built a magnetic chronostratigraphy of Expedition 323 sediments suitable for regional correlation and dating over the last 1 million years, and compared this with oxygen-isotope chronostratigraphy from sites U1339 and U1345.
ISSN:0967-0645
1879-0100
DOI:10.1016/j.dsr2.2016.02.004