Age models for Black Sea sediments ...

• Main Authors: Nowaczyk, Norbert R, Arz, Helge Wolfgang, Frank, Ute, Kind, J, Plessen, Birgit
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2012
• Subjects: Antarc*; Antarctica; Geomagnetic Pole; Greenland; ice core; NGRIP
• Online Access: https://dx.doi.org/10.1594/pangaea.853657; https://doi.pangaea.de/10.1594/PANGAEA.853657

Investigated sediment cores from the southeastern Black Sea provide a high-resolution record from mid latitudes of the Laschamp geomagnetic polarity excursion. Age constraints are provided by 16 AMS 14C ages, identification of the Campanian Ignimbrite tephra (39.28±0.11 ka), and by detailed tuning of sedimentologic parameters of the Black Sea sediments to the oxygen isotope record from the Greenland NGRIP ice core. According to the derived age model, virtual geomagnetic pole (VGP) positions during the Laschamp excursion persisted in Antarctica for an estimated 440 yr, making the Laschamp excursion a short-lived event with fully reversed polarity directions. The reversed phase, centred at 41.0 ka, is associated with a significant field intensity recovery to 20% of the preceding strong field maximum at ~50 ka. Recorded field reversals of the Laschamp excursion, lasting only an estimated ~250 yr, are characterized by low relative paleointensities (5% relative to 50 ka). The central, fully reversed phase of the ... : Supplement to: Nowaczyk, Norbert R; Arz, Helge Wolfgang; Frank, Ute; Kind, J; Plessen, Birgit (2012): Dynamics of the Laschamp geomagnetic excursion from Black Sea sediments. Earth and Planetary Science Letters, 351-352, 54-69 ...