FN Archimer Export Format
PT J
TI Paleomagnetic direction and paleointensity variations during the Matuyama-Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan
BT 
AF OKADA, Makoto
   SUGANUMA, Yusuke
   HANEDA, Yuki
   KAZAOKA, Osamu
AS 1:1;2:2,3;3:1;4:4;
FF 1:;2:;3:;4:;
C1 Ibaraki Univ, Dept Earth Sci, 2-1-1 Bunkyo, Mito, Ibaraki 3108512, Japan.
   Natl Inst Polar Res, 10-3 Midoricho, Tachikawa, Tokyo 1908518, Japan.
   SOKENDAI, Dept Polar Sci, 10-3 Midoricho, Tachikawa, Tokyo 1908518, Japan.
   Res Inst Environm Geol, 3-5-1 Inagekaigan, Chiba, Chiba 2610005, Japan.
C2 UNIV IBARAKI, JAPAN
   NATL INST POLAR RES, JAPAN
   UNIV GRAD ADV STUDIES, JAPAN
   RES INST ENVIRONM GEOL, JAPAN
IN DOAJ
IF 2.773
TC 44
UR https://archimer.ifremer.fr/doc/00420/53174/55181.pdf
   https://archimer.ifremer.fr/doc/00420/53174/55182.xls
   https://archimer.ifremer.fr/doc/00420/53174/55184.xls
LA English
DT Article
CR IMAGES 3-IPHIS-MD106
   SEYMAMA - MD 65
BO Marion Dufresne
DE ;Paleomagnetism;Magnetostratigraphy;Matuyama-Brunhes boundary;Paleointensity;Marine isotope stage (MIS) 19;Chiba composite section
AB The youngest geomagnetic polarity reversal, the Matuyama-Brunhes (M-B) boundary, provides an important plane of data for sediments, ice cores, and lavas. The geomagnetic field intensity and directional changes that occurred during the reversal also provide important information for understanding the dynamics of the Earth's outer core, which generates the magnetic field. However, the reversal process is relatively rapid in terms of the geological timescale; therefore, adequate temporal resolution of the geomagnetic field record is essential for addressing these topics. Here, we report a new high-resolution paleomagnetic record from a continuous marine succession in the Chiba composite section of the Kokumoto Formation of the Kazusa Group, Japan, that reveals detailed behaviors of the virtual geomagnetic poles (VGPs) and relative paleointensity changes during the M-B polarity transition. The resultant relative paleointensity and VGP records show a significant paleointensity minimum near the M-B boundary, which is accompanied by a clear "polarity switch." A newly obtained high-resolution oxygen isotope chronology for the Chiba composite section indicates that the M-B boundary is located in the middle of marine isotope stage (MIS) 19 and yields an age of 771.7 ka for the boundary. This age is consistent with those based on the latest astronomically tuned marine and ice core records and with the recalculated age of 770.9 +/- 7.3 ka deduced from the U-Pb zircon age of the Byk-E tephra. To the best of our knowledge, our new paleomagnetic data represent one of the most detailed records on this geomagnetic field reversal that has thus far been obtained from marine sediments and will therefore be key for understanding the dynamics of the geomagnetic dynamo and for calibrating the geological timescale. 
PY 2017
PD MAR
SO Earth Planets And Space
SN 1880-5981
PU Springer Heidelberg
VL 69
IS 45
UT 000397333000002
DI 10.1186/s40623-017-0627-1
ID 53174
ER

EF