A geomagnetic event recorded in loess deposits of the Tönchesberg (Germany): identification of the Blake magnetic polarity episode

Reinders, Jan; Hambach, Ulrich

doi:10.1111/j.1365-246x.1995.tb07004.x

Cited by 32 publications

(18 citation statements)

References 33 publications

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“…Tarling and Hrouda, 1993;Lagroix and Banerjee, 2002), or may be caused by post-depositional processes (e.g. slope movement processes, Reinders and Hambach, 1995).…”

Section: Anisotropy Parametersmentioning

confidence: 99%

Loess magnetic fabric of the Krems-Wachtberg archaeological site

Zeeden

Hambach

Händel

2015

Quaternary International

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“…Tarling and Hrouda, 1993;Lagroix and Banerjee, 2002), or may be caused by post-depositional processes (e.g. slope movement processes, Reinders and Hambach, 1995).…”

Section: Anisotropy Parametersmentioning

confidence: 99%

Loess magnetic fabric of the Krems-Wachtberg archaeological site

Zeeden

Hambach

Händel

2015

Quaternary International

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“…Since then it has been reported in different records, including oceanic sediments (Tric et aI., 1991;Thouveny et aI., 2004;Lund et aI., 2006) lacustrine sediments ((reer et aI., 1980), loess deposits (Zhu et aI., 1994;Reinders and Hambach, 1995;Fang et aI., 1997) and continental sediments (Shier et aI., 2011). But the morphology and age of the event still remain controversial.…”

Section: Introductionmentioning

confidence: 99%

The Blake geomagnetic excursion recorded in a radiometrically dated speleothem

Osete

Martı́n-Chivelet

Rossi

et al. 2012

Earth and Planetary Science Letters

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Keywords:geomagnetic excursions speleothems radioisotope geochronology palaeointensity rock magnetism quaternary geochronologyOne of the most important developments in geomagnetism has been the recognition of polarity excursions of the Earth's magnetic field. Accurate timing of the excursions is a key point for understanding the geodynamo process and for magnetostratigraphic correlation. One of the best known excursions is the Blake geomagnetic episode, which occurred during marine isotope stage MIS 5, but its morphology and age remain controversial. Here we show, for the first time, the Blake excursion recorded in a stalag mite which was dated using the uranium-series disequilibrium techniques. The characteristic remanent magnetisation is carried by fine-graine d magnetite. The event is documented by two reversed intervals (Bl and B2). The age of the event is estimated to be between 116.5 + 0.7 kyr BP and 112.0 + 1.9 kyr BP, slightly younger (�3-4 kyr) than recent estimations from sedimentary records dated by astronomical tuning. Low values of relative palaeointensity during the Blake episode are estimated, but a relative maximum in the palaeofield intensity coeval with the complete reversal during the B2 interval was observed. Duration of the Blake geomagnetic excursion is 4.5 kyr, two times lower than single excursions and slightly higher than the estimated diffusion time for the inner core (�3 kyr).

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“…Zhu et al, 1994;Bourne et al, 2012). However, stable endpoints are not always reached, as reported by Reinders and Hambach (1995).…”

Section: Discussionmentioning

confidence: 84%

“…Available data for Europe show 'mixed' results. For example, Reinders and Hambach (1995) published palaeomagnetic directions from a 130 cm thick loess profile from the Eifel (Germany) for which "no stable endpoint could be determined", but some levels were interpreted as fully reversed. Other samples show more intermediate directions.…”

Section: Introductionmentioning

confidence: 99%

Evidence for the Blake Event recorded at the Eemian archaeological site of Caours, France

Sier

Parés

Antoine

et al. 2015

Quaternary International

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a b s t r a c tA palaeomagnetic study of the Last Interglacial calcareous tufa sequence at the archaeological site of Caours (northern France) identified a geomagnetic excursion that we interpret as the Blake Event. Earlier palaeontological (molluscs, mammals) and geochemical proxy studies at this site allowed recognition of full interglacial conditions prevailing during the deposition of the tufa sequence. The tufa sequence and associated Palaeolithic levels have been dated to the Eemian interglacial by a set of TIMS U/Th measurements on calcitic concretions (average : 123 ± 3 ka). By previous correlations of the Blake Event with the Eemian sensu stricto (as defined in the Netherlands) pollenzones at Neumark Nord 2 (Germany) and Rutten (The Netherlands) it has been shown that the continental Eemian starts after the peak of Marine Isotope Stage (MIS) 5e. The identification of the Blake Event at Caours implies a post MIS 5e peak age for all four levels of the Palaeolithic occupation. In perspective of the time lag between the MIS 5e peak and the beginning of the Eemian identified in other studies, it is very likely that during the main occupation of Caours a significant barrier was in place between north western France and Great Britain, in the form of the English Channel. It is possible that the chronological position of the Last Interglacial environments in northwestern Europe in relation to sea-level change is a key factor behind the apparent absence of Last Interglacial Palaeolithic sites in Great Britain.

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A geomagnetic event recorded in loess deposits of the Tönchesberg (Germany): identification of the Blake magnetic polarity episode

Cited by 32 publications

References 33 publications

Loess magnetic fabric of the Krems-Wachtberg archaeological site

Loess magnetic fabric of the Krems-Wachtberg archaeological site

The Blake geomagnetic excursion recorded in a radiometrically dated speleothem

Evidence for the Blake Event recorded at the Eemian archaeological site of Caours, France

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