Updated Iberian Archeomagnetic Catalogue: New Full Vector Paleosecular Variation Curve for the Last Three Millennia

Molina‐Cardín, Alberto; Campuzano, Saioa A.; Osete, M. L.; Rivero-Montero, M.; Pavón‐Carrasco, F. J.; Palencia-Ortas, A.; Martín-Hernández, F.; Gómez‐Paccard, Miriam; Chauvin, Annick; Guerrero-Suarez, S.; Pérez-Fuentes, J. C.; McIntosh, G.; Catanzariti, Gianluca; Sastre-Blanco, José; Larrazabal, J.; Martínez, Víctor Manuel Fernández; Sanchís, Jesús R. Álvarez; Hernández, Jesús Rodríguez; Viso, Iñaki Martín; Rubert, David Garcia i

doi:10.1029/2018gc007781

Cited by 43 publications

(43 citation statements)

References 91 publications

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“…The new French DSV curve is compared in Fig. 12 with other regional curves established in neighbouring countries, namely Germany (Schnepp and Lanos, 2005), the UK (Batt et al, 2017) and Iberia (Molina-Cardín et al, 2018). The latter curves are based on databases that cover most of the last two millennia with only a weak influence of the French database (i.e.…”

Section: Comparison Of the Revised French Dsv Curve With Other Westermentioning

confidence: 99%

“…Numerous studies have led to a better understanding of the temporal variations of the geomagnetic field in different parts of the world, although these data still mainly concern the European area (e.g. Schnepp and Lanos, 2005;Gómez-Paccard et al, 2006;Martón and Ferencz, 2006;Tema et al, 2006;Batt et al, 2017;Molina-Cardín et al, 2018;Shaar et al, 2018;Schnepp et al, 2020). For metropolitan France, in particular, the last two decades have been marked by significant progress in the knowledge of directional variations during the first millennium BC (e.g.…”

Section: Introductionmentioning

confidence: 99%

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An updated archeomagnetic directional variation curve for France over the past two millennia, following 25 years of additional data acquisition

Goff

Gallet

Warmé

et al. 2020

Physics of the Earth and Planetary Interiors

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Nearly 40 years ago, Emile Thellier published an article summarizing the archeomagnetic data he had obtained during his career, which had allowed him to recover the main features of the directional variations of the geomagnetic field in France for the last two millennia. This database went on to be significantly completed 25 years ago by Ileana Bucur, who had taken over Thellier's work on archeomagnetism; this forms the current basis of our knowledge of the directional evolution of the geomagnetic field in France. Since then, archeomagnetic studies have been continued at Thellier's historical laboratory in Saint Maur. This article presents the directional archeomagnetic data obtained in France over the past 25 years in this same laboratory. A total of 528 new data are presented, which, together with the 170 results obtained on the French territory previously listed in Bucur (1994), constitute the French directional database (698 data in all). All but two of these data were obtained using the experimental protocol developed by E. Thellier based on the analysis of large samples and on a magnetic viscosity test that has proved its reliability on numerous occasions. The directions from the entire French database have been precisely defined, with 95% of the α 95 values being less than 1.9°, and ~50% being less than 0.8°. The selection of 286 data with dating

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Section: Comparison Of the Revised French Dsv Curve With Other Westermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An updated archeomagnetic directional variation curve for France over the past two millennia, following 25 years of additional data acquisition

Goff

Gallet

Warmé

et al. 2020

Physics of the Earth and Planetary Interiors

View full text Add to dashboard Cite

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“…Hervé et al, 2017;Osete et al, 2016). The effects can also be high in burnt walls and soils (Palencia-Ortas et al, 2017;Molina-Cardin et al, 2018). Conversely, the influence of the TRM anisotropy is assumed negligible in lava flows.…”

Section: Challenges In Palaeointensity Determinationmentioning

confidence: 99%

Critical analysis of the Holocene palaeointensity database in Central America: Impact on geomagnetic modelling

Hervé

Perrin

Alva‐Valdivia

et al. 2019

Physics of the Earth and Planetary Interiors

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Thanks to its rich archaeological heritage, Central America is a key region to recover the past secular variation of the geomagnetic field. This article presents 13 new palaeointensity data on Epiclassic (650-900 CE) pottery sherds from Central Mexico. Archaeointensities were determined using the Thellier-Thellier protocol with anisotropy and cooling rate corrections. Average results between 25 and 42 µT reveals a fast secular variation in the second half of the first millennium CE but are not in agreement with global geomagnetic models that predict a higher geomagnetic field strength. To check the reasons of this discrepancy, we compiled all intensity data over the last millennia published in Central America. The Bayesian curve calculated from 194 data covering the last 4 millennia highlights a rapid succession of oscillations of the geomagnetic field strength between 20 and 80 µT. But a critical analysis of the dataset shows a large influence of data quality, 74% of them having a poor cooling unit consistency and experimental quality. The small number of specimens per cooling unit and the anisotropy correction absent or incorrectly made increase the scatter between data, whereas the absence of cooling rate correction biases the dataset towards higher palaeointensity. Discarding these data results in a lower secular variation by removing most extreme values and several intensity oscillations. The weaknesses of the dataset are likely the main reason of the limitations of global models in Central America. Pending the acquisition of new high-quality data, archaeomagnetic dating seems premature in Central America.

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“…This Levantine Iron Age anomaly (LIAA) was likely at the origin of two short-lived high-intensity events called "geomagnetic spikes" (Ben-Yosef et al, 2009;Shaar et al, 2011). The migration of the LIAA through Europe would be responsible for the large and fast variations of the geomagnetic field observed in this region during the first millennium BCE in both direction (e.g., Hervé et al, 2013;Palencia-Ortas et al, 2017;Shaar et al, 2018) and intensity (e.g., Hervé et al, 2017;Molina-Cardin et al, 2018;Shaar et al, 2016). Besides the role of these nondipolar fields, global reconstructions of data suggest that the influence of the dipolar field should not be underestimated with a maximum of the dipole moment during the first millennium BCE (Usoskin et al, 2016) and a 10-15°dipole tilt during the first half of this millennium (Nilsson et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Secular Variation of the Intensity of the Geomagnetic Field in Mexico During the First Millennium BCE

Hervé

Perrin

Alva‐Valdivia

et al. 2019

Geochem Geophys Geosyst

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In Western Eurasia, the first millennium BCE is characterized by the fastest secular variation of the Earth Magnetic Field observed over the last millennia and by a geomagnetic anomaly centered on the Middle East. On the global scale, the variation of the dipolar field during this period remains poorly constrained because of the lack of data in other geographical areas. Here, we presented 23 new mean archaeointensity data on ceramic sherds dated between 1500 BCE and 200 CE from Chalcatzingo archaeological site in Central Mexico. Archaeointensities were determined using the classical Thellier-Thellier protocol with corrections for TRM anisotropy and cooling rate effects. Our work doubles the number of high-quality archaeointensity data in Mexico during the considered period. Using a Bayesian approach, a new secular variation curve was calculated at Mexico City between 1500 BCE and 200 CE after selection of Mexican archaeointensity data. After a period of oscillations of the intensity between 20 and 40 μT from 1500 to 300 BCE, the curve shows a large maximum`~65 μT in the second century BCE. The corresponding VADM varied between~4.0 and~11.0 × 10 22 Am 2 , which highlights further that the intensity of the geomagnetic field could vary at regional scale over a larger range as previously thought. However, this amplitude variation may be overestimated, as it does not take into account the fast directional variation observed at this time.Plain Language Summary Archaeological baked clays are the best material to reconstitute the past secular variation of the Earth magnetic field, because they acquired a generally stable thermoremanent magnetization usually parallel and proportional to the ambient field at the time of their baking. Global modeling of the geomagnetic field requires a spatial and temporal distribution of data as homogeneous as possible, which is still not the case yet. In spite of its rich archaeological heritage, high-quality archaeointensity data are still very few in Mexico. The present study focuses on pottery sherds dated between 1500 BCE and 200 CE from Chalcatzingo archaeological site in Central Mexico. We obtained 21 new mean archaeointensities, which almost doubles the high-quality Mexican dataset for this period. The new secular variation Mexican curve exhibits oscillations of the intensity between 20 and 40 μT from 1500 to 300 BCE, before a large maximum~65 μT in the second century BCE. This work will help to have a better knowledge of the variation of the dipolar geomagnetic field during the first millennium BCE, when the fastest secular variation over the last millennia was reported in the Middle East ("geomagnetic spikes").

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Updated Iberian Archeomagnetic Catalogue: New Full Vector Paleosecular Variation Curve for the Last Three Millennia

Cited by 43 publications

References 91 publications

An updated archeomagnetic directional variation curve for France over the past two millennia, following 25 years of additional data acquisition

An updated archeomagnetic directional variation curve for France over the past two millennia, following 25 years of additional data acquisition

Critical analysis of the Holocene palaeointensity database in Central America: Impact on geomagnetic modelling

Secular Variation of the Intensity of the Geomagnetic Field in Mexico During the First Millennium BCE

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