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

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doi: 10.1016/j.dsr2.2016.02.004
Author(s): Lund, Steve; Stoner, Joseph; Okada, Makoto; Mortazavi, Emily
Author Affiliation(s): Primary:
University of Southern California, Department of Earth Sciences, Los Angeles, CA, United States
Other:
Oregon State University, United States
Ibaraki University, Japan
Volume Title: Plio-Pleistocene paleoceanography of the Bering Sea
Volume Author(s): Takahashi, Kozo, editor; Ravelo, A. Christina; Okazaki, Yusuke
Source: Plio-Pleistocene paleoceanography of the Bering Sea, edited by Kozo Takahashi, A. Christina Ravelo and Yusuke Okazaki. Deep-Sea Research. Part II: Topical Studies in Oceanography, Vol.125-126, p.107-116. Publisher: Elsevier, Oxford, International. ISSN: 0967-0645
Note: In English. 28 refs.; illus., incl. 2 tables, sketch map
Summary: IODP Expedition 323 recovered six complete and replicate records of Brunhes-Chron paleomagnetic field variability (0-780,000 years BP) in 2820 m 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 300 m 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. Abstract Copyright (2016) Elsevier, B.V.
Year of Publication: 2016
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 03 Geochronology; 24 Surficial Geology, Quaternary Geology; Bering Sea; Bowers Ridge; Brunhes Chron; Cenozoic; Chronostratigraphy; Cores; Depositional environment; Expedition 323; IODP Site U1339; IODP Site U1340; IODP Site U1341; IODP Site U1342; IODP Site U1343; IODP Site U1344; IODP Site U1345; Integrated Ocean Drilling Program; Magnetic intensity; Magnetostratigraphy; Marine environment; Matuyama Chron; North Pacific; Northwest Pacific; Pacific Ocean; Paleomagnetism; Pleistocene; Quaternary; Secular variations; Upper Cenozoic; Upper Quaternary; West Pacific
Record ID: 2017013129
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands

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