Zusammenfassung
Paläomagnetische Analysen einer Serie von Sedimentkernen aus der Norwegisch-Grönländischen See dokumentieren die Existenz von sieben kurzen geomagnetischen Ereignissen innerhalb der letzten etwa 500.000 Jahre. Alter und Dauer dieser extrem von der regulären Konfiguration normaler Polarität des erdmagnetischen Feldes der Brunhes Epoche abweichenden Episoden werden im Zeitrahmen von Biostratigraphien kalkiger Nannofossilien bestimmt, die mit einer Sauerstoffisotopen-Chronostratigraphie korreliert sind. Die geomagnetischen Ereignisse erstrecken sich typischerweise über Zeiträume von 5 bis 10 tausend Jahren. Zwei Ereignisse werden im Intervall der Sauerstoffisotopen Stadien 2–4 beobachtet. Ein kurzes Ereignis fällt in etwa mit der Stadien 4/5 Grenze zusammen, ein weiteres findet sich knapp unterhalb der Stadien 5/6 Grenze. Drei weitere geomagnetische Ereignisse sind im Sauerstoffisotopen Stadium 6, an der Stadien 9/10 Grenze und nahe dem Ende des Stadiums 13 identifiziert worden.
Abstract
Paleomagnetic analyses of a series of sediment cores from the Norwegian—Greenland Sea document the existence of seven short-lived geomagnetic events during the last about 500.000 years. Calcareous nannofossil biostratigraphy, correlated to oxygen isotope chronostratigraphy, provides a time framework to infer age and duration of these periods of extreme divergence of the earth's magnetic paleofield from the regular normal polarity configuration of the Brunhes Chron. The geomagnetic events typically extend over 5 to 10 kyr. Two events are observed within the oxygen isotope stage 2–4 interval. A short event is recorded at the stage 4/5 boundary and another just below the stage 5/6 boundary. Additional three geomagnetic events are identified in oxygen isotope stage 6, at the stage 9/10 boundary and near the top of oxygen isotope stage 13, respectively.
Résumé
Des analyses paléomagnétiques pratiquées dans une série de carottes de sédiments de la mer de Norvège-Groenland montrent l'existence de sept événements géomagnétiques de courte durée, au cours des derniers 500.000 ans. Ces événements sont marqués par une extrême divergence du champ paléomagnétique terrestre par rapport à la configuration régulière de la polarité normale de Brunhes. La biostratigraphie des nannofossiles calcaires, correlée à la chronostratigraphie des isotopes de l'oxygène, fournit un cannevas temporel qui permet d'en préciser l'âge et la durée. Ils s'étendent typiquement sur 5 000 à 10 000 ans. Deux événements sont observés dans l'intervalle 2–4 des stades des isotopes de l'oxygène. Un événement court est enregistré à la limite des stades 4/5 et un autre juste sous la limite 5/6. Les trois autres événements se situent respectivement dans le stade 6, à la limite des stades 9/10 et près du sommet du stade 13.
Краткое содержание
С помощью метода пале омагнитных измерени й на серии кернов седимен тов из гренландского моря установили, что за последние 500.000 лет здесь имели место 7 геомагнитных событи я. Возраст и продолжит ельность этих чрезвычайных, от кланяющихся от регул ярной конфигурации нормал ьной полярности земного магнитного п оля эпохи Brunhes, определил и по биостратиграфии и звестковых наннофау н, которые коррелируют с хронос тратиграфией. Продол жительность каждого геомагнитно го события составлял а от 5 до 10 тысяч лет. Два со бытия наблюдали в интеравале стадий 2–4 и зотопов кислорода. Од но краткое событие имел о место в интервале ру бежа стадий 4/5, следующее — чуть ниж е рубежа стадий 5/6. Три дальнейших события с овпадают со стадией 6, р убежем стадий 9/10 и в конце стад ии 13.
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Bleil, U., Gard, G. Chronology and correlation of Quaternary magnetostratigraphy and nannofossil biostratigraphy in Norwegian-Greenland Sea sediments. Geol Rundsch 78, 1173–1187 (1989). https://doi.org/10.1007/BF01829339
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DOI: https://doi.org/10.1007/BF01829339