Refined 3600 years palaeointensity curve for Mexico

Mahgoub, Ahmed Nasser; Juárez-Arriaga, Erick; Böhnel, Harald; Manzanilla, Linda; Cyphers, Ann

doi:10.1016/j.pepi.2019.106328

Cited by 11 publications

(29 citation statements)

References 76 publications

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“…Our curve does not show any evidence for the "geomagnetic spike" seen in 893±135 BCE in two sedimentary sequences of Hall's cave in Texas, only 1,200 km away from Mexico City (Bourne et al, 2016) (Figure 5b). Unlike palaeointensities higher than 100 μT, two data (CHAL102, this study; EB-229, Mahgoub et al, 2019b) possibly point out an intensity low around 15-20 μT at the same period. These low values will have to be confirmed but already shows that the intensity of the geomagnetic field varied at the regional scale over a larger range than previously thought.…”

Section: 1029/2019gc008668mentioning

confidence: 47%

“…Intensities of Rodriguez‐Ceja et al (, ) calculated on a secondary or two overlapping components of magnetization were not considered. Since the publication of Hervé, Chauvin, et al (), the short high‐quality dataset was updated with four new data from Mahgoub et al () and seven from Mahgoub et al (). Concerning our new Chalcatzingo data, 21/23 respect these criteria; the two sherds (CHAL019 and CHAL132) are discarded because only two successful archaeointensities were obtained by sherd…”

Section: Discussionmentioning

confidence: 99%

“…Geochemistry, Geophysics, Geosystems (2009,2012) calculated on a secondary or two overlapping components of magnetization were not considered. Since the publication of , the short high-quality dataset was updated with four new data from Mahgoub et al (2019a) and seven from Mahgoub et al (2019b). Concerning our new Chalcatzingo data, 21/23 respect these criteria; the two sherds (CHAL019 and CHAL132) are discarded because only two successful archaeointensities were obtained by sherd Most other Mexican data were corrected for anisotropy effects with the Mean (XYZ) method, averaging the archaeointensities of six specimens from the same sample, for which the laboratory field during the Thellier experiments was applied along +x, −x, +y, −y, +z, or −z axis, respectively.…”

Section: 1029/2019gc008668mentioning

confidence: 99%

“…This clearly underlines the necessity of full vector determination for a good resolution of the secular variation of the Earth Magnetic field. (Goguitchaichvili et al, 2018;Mahgoub et al, 2019aMahgoub et al, , 2019b and the predictions of global models BIGMUDI4k.1 (Arneitz et al, 2019), CALS10k.2 (Constable et al, 2016), COV-ARCH, and COV-LAKE (Hellio & Gillet, 2018). (b) Comparison of the curve of the Virtual Axial Dipole Moment (VADM) in Mexico with data from north-western USA (Champion, 1980), the East Pacific Ridge (Gee et al, 2000;Pick & Tauxe, 1993) and Hawaii (Cromwell et al, 2018;Mankinen & Champion, 1993;Pressling et al, 2006;Pressling et al, 2007;Tema et al, 2017;Valet et al, 1998).…”

Section: Comparison With Other Regional Recordsmentioning

confidence: 99%

“…In Mexico, a large number of archaeomagnetic studies on baked clays or lava flows have been published in the last 10 years (e.g., Fanjat et al, 2013;Mahgoub et al, 2017;Mahgoub et al, 2019bMahgoub et al, , 2019aMahgoub et al, 2019aMahgoub et al, , 2019bPétronille et al, 2012;Rodriguez-Ceja et al, 2009;Rodriguez-Trejo et al, 2019;Terán et al, 2016), but a recent critical analysis of the Mexican dataset showed that around 70% of these data cannot be considered as high quality, according to basic selection criteria. Two local secular variation curves have been recently proposed using only Mexican data (Mahgoub et al, 2019a) or also some from the southwestern United States (Goguitchaichvili et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: 1029/2019gc008668mentioning

confidence: 47%

Section: Discussionmentioning

confidence: 99%

Section: 1029/2019gc008668mentioning

confidence: 99%

Section: Comparison With Other Regional Recordsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Archaeomagnetic dating and magnetic characterization of ceramics from the Paquimé, Casas Grandes region, Chihuahua, Mexico

Alva‐Valdivia

Rodríguez-Trejo

Cruz-Antillón

et al. 2021

Journal of Archaeological Science: Reports

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Reassessment of paleointensity estimated of a single lava flow from Xitle volcano, Mexico, by means of multispecimen domain-state corrected

Alva‐Valdivia

Bravo-Ayala

Camps

et al. 2020

Journal of South American Earth Sciences

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Determining paleomagnetic field intensity (paleointensity: PI) for lavas with high reliability and low measurement uncertainty is still difficult to achieve. In addition to the factors on which the PI used methods depend, this could be attributed to some non-ideal physical and magnetic characteristics of lava sample, including grain size, cooling rate effect, and thermal stability. Xitle volcano (SW Mexico City) is a good example to illustrate and discuss this problem because dozens of previous PI studies were carried out on its evolved flow units, which have commonly resulted in different mean values with large dispersions. Indeed, 211 published PI data obtained by use of Thellier and microwave experiments gave a mean of 64.1 µT with a standard deviation of 11.0 µT. After a careful evaluation, we found that only 134 of these data can be considered reliable, as they meet a set of selection criteria designed in this study. These evaluated data gave an average mean of 62.0 ± 9.3 µT. In order to strengthen the PI estimates of Xitle, we conducted a multispecimen domain-state corrected (MSP-DSC) method along one vertical (~ 4.5m) and three horizontal (~ 1.25m, each) profiles. Top horizontal and vertical profiles have fulfilled a stringent criteria set while central and bottom profiles exceeded the alteration check criteria limit and thus are considered unreliable. Accordingly, Xitle PI mean derived from MSP-DSC experiment is calculated at 60.5 ± 4 µT, thus in a good agreement with the mean value estimated from previous filtered data. The result and success rate obtained may be ascribed to cooling rate variations commonly found at the lava profile, and indicate that MSP-DSC outcome is governed by the magnetic properties such as the domain-size behavior and the thermal stability of the magnetic carriers present in the treated specimens, as in the conventional Thellier & microwave-style experiments. From these two averages, a combined mean and standard deviation of 61.9 ± 9 µT is calculated, which technically is considered the most probable intensity estimate at the Xitle eruption time, . 370 AD.

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Refined 3600 years palaeointensity curve for Mexico

Cited by 11 publications

References 76 publications

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

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

Archaeomagnetic dating and magnetic characterization of ceramics from the Paquimé, Casas Grandes region, Chihuahua, Mexico

Reassessment of paleointensity estimated of a single lava flow from Xitle volcano, Mexico, by means of multispecimen domain-state corrected

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Refined 3600 years palaeointensity curve for Mexico

Cited by 11 publications

References 76 publications

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

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

Archaeomagnetic dating and magnetic characterization of ceramics from the Paquimé, Casas Grandes region, Chihuahua, Mexico

Reassessment of paleointensity estimated of a single lava flow from Xitle volcano, Mexico, by means of multispecimen domain-state corrected

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Refined 3600 years palaeointensity curve for Mexico