Global archaeomagnetic data: The state of the art and future challenges

Brown, M. C.; Hervé, Gwenaël; Korte, Monika; Genevey, Agnès

doi:10.1016/j.pepi.2021.106766

Cited by 27 publications

(16 citation statements)

References 289 publications

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“…4 B,C). It is important to note that the time interval from 5000 BCE to 1900 CE is relatively well-document in terms of paleomagnetic data 57 , whereas some time intervals lack critically reliable paleomagnetic data (ex. from 7000 to 5000 BCE).…”

Section: Discussionmentioning

confidence: 99%

Paleomagnetic techniques can date speleothems with high concentrations of detrital material

Sánchez‐Moreno

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Pavón‐Carrasco

et al. 2022

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The U-series dating of young and ‘dirty’ speleothems is challenging due to difficulties in assessing the isotopic composition of detrital contaminants and the low-abundance of 230Th generated in situ. Here we propose a new dating approach based on the comparison of a speleothem’s paleomagnetic directions to reference curves from global paleomagnetic reconstructions. This approach is demonstrated on a stalagmite collected from the Soprador do Carvalho cave in the Central Region of Portugal. A radioisotopic age model, built using four U-series ages and three 14C, suggests relatively steady carbonate precipitation from ~ 5760 BCE until ~ 1920 CE. Forty-five 6 mm-thick subsamples were analyzed using alternating field and thermal demagnetization protocols, providing well-defined, primary magnetic directions. An age model of the stalagmite was obtained by fitting its paleomagnetic record with the reference paleosecular variation curves obtained by previous paleo-reconstruction models, applying statistical bootstrapping analysis to define their best fit. The resulting age models fit closely with the radioisotopic age model but provide a significantly higher time resolution. We reach the same conclusion when applying this approach to another stalagmite from the Algarve region of Portugal. Our approach thus appears a promising alternative to date young speleothems with high detrital contents.

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Section: Discussionmentioning

confidence: 99%

Paleomagnetic techniques can date speleothems with high concentrations of detrital material

Sánchez‐Moreno

Font

Pavón‐Carrasco

et al. 2022

Sci Rep

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“…The integration of diverse data sources for creating new PSV curves will be critical. The combination of high-resolution lake and marine sediment records with archeomagnetic studies and alternative sources like speleothems will be vital for improving PSV records, particularly in the Southern Hemisphere (Korte et al 2019;Brown et al 2021).…”

Section: The Future Of Paleomagnetism and Its Applications In Volcano...mentioning

confidence: 99%

Paleomagnetism and rock magnetism as tools for volcanology

et al. 2022

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Paleomagnetic and rock magnetic methods for studying volcanoes and their products have been developed since the second half of the twentieth century. These methods have been used to find tephra in sediment cores, date volcanic eruptions and deposits, determine emplacement temperatures of volcanic deposits, and estimate flow directions of dikes, lava flows, and pyroclastic flow deposits. In the twenty-first century, these techniques have steadily improved and expanded, resulting in more probing and precise studies of volcanoes using paleomagnetism. We believe that continual improvement of existing techniques and the increased awareness and interest in paleomagnetic methods should allow more studies to enhance the understanding of volcanic processes.

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“…The acquisition of numerous, reliable, new data from well-dated, archaeological baked clays allowed to greatly improve our knowledge about the evolution of the Earth's magnetic field. Though this progress holds for both directions and intensities, the records of the latter are by far richer and more consistent leading to the improvement of regional and global geomagnetic models (Brown et al, 2021). Among the various recordings of the geomagnetic field (GMF) intensity, a feature which is being thoroughly studied are the "spikes" that is short-lived regional intensity maxima episodes whose spatial and temporal variation as well as their origin are nowadays better understood (e.g., Shaar et al, 2011;de Groot et al, 2013;Genevey et al, 2016;Gómez-Paccard et al, 2012, 2016Livermore et al, 2021).…”

Section: Introductionmentioning

confidence: 97%