We have developed replicate paleomagnetic secular variation (PSV) records for MIS 6–7 (130–244 ka) from IODP Ex. 3 23 Sites 1,343, 1,344, and 1,345 (Bering Sea). We can correlate the PSV at all three sites and identify 90 inclination features and 64 declination features. We have developed relative paleointensity records for all three sites by normalizing the demagnetized natural remanence to magnetic susceptibility. Paleointensity highs/lows can be tied to the PISO-1500 global oxygen-isotope-dated paleointensity record. This provides a significant increase in chronostratigraphic resolution for these sites. Only one excursion is recorded in the MIS 6–7 sediments of the Bering Sea—the Iceland Basin Excursion (∼196 ± 3 ka). Replicate records of the inclinations and declinations both flip quickly to reversed polarity directions, stay there for several hundred years and then flip quickly back to normal polarity directions. However, the inclination flips occur without significant declinations changes and visa versa. A statistical PSV study was carried out by averaging the data in 3 ky and 9 ky windows. There is a distinctive bimodal pattern to the angular dispersions with most time spent with low angular dispersion values (∼10°–15°), but there is an interval of more than 30 ky (185–220 ka) with angular dispersions averaging two to three times higher amplitudes (∼25°–35°). This interval also has low paleointensities and the Iceland Basin Excursion. This same, coupled pattern of high angular dispersion, low paleointensity, and excursions is noted synchronously in the central North Atlantic Ocean and may indicate a global pattern to the geomagnetic field.

中文翻译：

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白令海的古地磁场变化和修订的年代地层学 （IODP Expedition 323）MIS 6-7 （130-144 ka） 期间的深海沉积物


我们已经从 IODP Ex. 3 23 站点 1,343、1,344 和 1,345（白令海）开发了 MIS 6-7 （130-244 ka） 的复制古地磁长期变化 （PSV） 记录。我们可以关联所有三个站点的 PSV 并识别 90 个倾斜特征和 64 个赤纬特征。通过将退磁自然剩磁标准化为磁化率，我们开发了所有三个站点的相对古强度记录。古强度高/低可以与 PISO-1500 全球氧同位素测年古强度记录相关联。这显著提高了这些遗址的年代地层分辨率。在白令海的 MIS 6-7 沉积物中只记录了一次短途旅行——冰岛盆地短途旅行（∼196 ± 3 ka）。倾斜和偏角的复制记录都迅速翻转到相反的极性方向，在那里停留几百年，然后迅速翻转回正常的极性方向。然而，倾斜翻转发生时没有明显的赤纬变化，反之亦然。通过在 3 ky 和 9 ky 窗口中平均数据进行统计 PSV 研究。角度色散具有独特的双峰模式，大部分时间都花在较低的角度色散值 （∼10°–15°） 上，但存在超过 30 ky （185–220 ka） 的间隔，角度色散的平均振幅高出两到三倍 （∼25°–35°）。这个层间也具有低古强度和冰岛盆地游览。这种高角度色散、低古强度和偏移的耦合模式在北大西洋中部同步记录，可能表明地磁场的全球模式。