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

Hervé, Gwenaël; Perrin, Mireille; Alva‐Valdivia, Luis M.; Tchibinda, Brina Madingou; Rodríguez-Trejo, A.; Hernández‐Cardona, Arnaldo; Tello, Mario Córdova; Rodríguez, Carolina Meza

doi:10.1016/j.pepi.2019.02.004

Cited by 9 publications

(15 citation statements)

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“…Data were retrieved from GEOMAGIA50 (Brown et al, 2021) Open (full) circles on Zijderveld plots correspond to a vertical (horizontal) plane projection, respectively. and from regional compilations (Hervé, Perrin, Alva-Valdivia, Tchibinda Madingou, et al, 2019;Jones et al, 2020Jones et al, , 2021Mahgoub, Juárez-Arriaga, Böhnel, Manzanilla, & Cyphers, 2019;Soler-Arechalde et al, 2019). Data were relocated to Casas de Fuego via the Virtual Geomagnetic Pole (VGP) and the Virtual Axial Dipole Moment (VADM) assumptions for directions and intensities respectively.…”

Section: Discussionmentioning

confidence: 99%

“…For the last 2 kyrs, 192 intensity averages were found within 2,000 km from Casas de Fuego: 141 from Mexico (see Alva-Valdivia et al, 2021;Garcia et al, 2021;Hervé, Perrin, Alva-Valdivia, Tchibinda Madingou, et al, 2019;Mahgoub, Juárez-Arriaga, Böhnel, Manzanilla, & Cyphers, 2019) and 51 from Western North America (e.g., Bowles et al, 2002;Champion, 1980;Jones et al, 2020;Sternberg, 1982). Archeological baked clays constitute 80% of the data set.…”

Section: Comparison With Intensity Data and Modelsmentioning

confidence: 99%

“…There has been a long tradition of archeomagnetic studies in Northern and Central America, with the first studies in the mid 60s (e.g., Bucha et al, 1970;Lee, 1975 for Mexico and see Jones et al, 2021 for USA) and continuous improvements since (e.g., Alva-Valdivia et al, 2020Dubois, 1989;Hagstrum & Champion, 2002;Hervé, Perrin, Alva-Valdivia, Tchibinda Madingou, et al, 2019;Jones et al, 2020Jones et al, , 2021Lengyel & Eighmy, 2002;Mahgoub, Juárez-Arriaga, Böhnel, Manzanilla, & Cyphers, 2019;Morales et al, 2009;Pétronille et al, 2012;Rodríguez-Trejo et al, 2019;Schaafsma et al, 2002;Soler-Arechalde et al, 2019;Sternberg, 1989;Wolfman, 1990). For the past 2 kyrs, around 325 intensities and 690 directions, respectively 11% and 12% of the worldwide archeomagnetic data set (GEOMAGIA50.v3.4; Brown et al, 2021), have been published.…”

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confidence: 99%

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First Full Vector Archeomagnetic Data From Northern Mexico

Madingou

Perrin

Hervé

et al. 2021

Geochem Geophys Geosyst

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Direct measurements of the geomagnetic field are available through ground observatories and navigators' data for the last 400 years (Jonkers et al., 2003) and satellite measurements for the last decades. For earlier periods, the data are obtained through the archeomagnetic study of archeological baked materials and volcanic rocks that acquire, during their last cooling, a thermoremanent magnetization (TRM) whose direction is parallel, and intensity is proportional to the intensity of the local geomagnetic field.Global models of the Earth's magnetic field have been constructed from direct, historical, and archeomagnetic data by inversion with spherical harmonic analysis in space (e.g.,

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Section: Discussionmentioning

confidence: 99%

Section: Comparison With Intensity Data and Modelsmentioning

confidence: 99%

mentioning

confidence: 99%

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First Full Vector Archeomagnetic Data From Northern Mexico

Madingou

Perrin

Hervé

et al. 2021

Geochem Geophys Geosyst

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“…The TRM intensity also depends on the cooling duration, and many archaeointensity studies on baked clays have demonstrated the necessity to correct this cooling rate effect, when the duration of the initial and laboratory cooling is significantly different (e.g., Fox & Aitken, ; Hervé et al, ). In this study, the cooling of the specimens in the laboratory furnace lasted about 30 min that is much faster than the archaeological cooling.…”

Section: Archaeomagnetic Experimentsmentioning

confidence: 99%

“…If we cannot totally discard an effect of this possible underestimation of the archaeological cooling on the archaeointensity determinations, it was shown that the TRM intensity increases with the cooling duration following a logarithmic trend (e.g., Genevey et al, ; Halgedahl et al, ). Hervé, Perrin, et al () demonstrated that such imprecision on the cooling estimation does not result in a significant inaccuracy of the average archaeointensity. Furthermore, much slower values of cooling rate are not expected at this archaeological period.…”

Section: Archaeomagnetic Experimentsmentioning

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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