Further evidence of the Levantine Iron Age geomagnetic anomaly from Georgian pottery

Shaar, Ron; Tauxe, Lisa; Goguitchaichvili, Avto; Devidze, Marina; Licheli, Vakhtang

doi:10.1002/2016gl071494

Cited by 32 publications

(67 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Only 1% show angular deviations larger than 19 • , demonstrating that the high inclination high declination episode in the tenth-ninth century BCE is a unique phenomenon. Altogether the new archaeomagnetic data covering the LIAA show large azimuthal deviations from an axial dipole (Figures 3C, 6) and steep inclinations (Figures 3B, 5B), corroborating the LIAA hypothesis of Shaar et al (2016Shaar et al ( , 2017.…”

Section: Comparison With Sedimentary Datasupporting

confidence: 69%

“…Only <1% of the published archaeomagnetic data from the past four millennia show angular deviations exceeding 19 • suggesting an unusual field behavior. The large angular deviation occurred during a period with extremely high field intensity in the Levant, providing additional support to the Levantine Iron Age Anomaly hypothesis of Shaar et al (2016Shaar et al ( , 2017 of a regional high field anomaly at the beginning of the first millennium BCE.…”

Section: Discussionmentioning

confidence: 59%

“…Non-axial Dipole Field During the Iron Age Anomaly Shaar et al (2016Shaar et al ( , 2017 hypothesized a positive local geomagnetic anomaly in the Levant between 1050 BCE to 750 BCE which they termed "The Levantine Iron Age Anomaly" (LIAA). The paleointensity data from the Levant supporting the LIAA hypothesis ( Figure 5A) show high field values between the mid-Eleventh century BCE and the eighth century BCE and two geomagnetic spikes (virtual axial dipole moment, VADM > 160 ZAm 2 ) (Ben-Yosef et al, 2009Shaar et al, 2011Shaar et al, , 2016.…”

Section: Comparison With Sedimentary Datamentioning

confidence: 99%

See 2 more Smart Citations

The First Catalog of Archaeomagnetic Directions From Israel With 4,000 Years of Geomagnetic Secular Variations

et al. 2018

Self Cite

View full text Add to dashboard Cite

The large and well-studied archaeological record of Israel offers a unique opportunity for collecting high resolution archaeomagnetic data from the past several millennia. Here, we initiate the first catalog of archaeomagnetic directions from Israel, with data covering the past four millennia. The catalog consists of 76 directions, of which 47 fulfill quality selection criteria with Fisher precision parameter (k) ≥ 60, 95% cone of confidence (α 95) < 6 • and number of specimens per site (n) ≥ 8. The new catalog complements our published paleointensity data from the Levant and enables testing the hypothesis of a regional geomagnetic anomaly in the Levant during the Iron Age proposed by Shaar et al. (2016, 2017). Most of the archaeomagnetic directions show <15 • angular deviations from an axial dipole field. However, we observe in the tenth and ninth century BCE short intervals with field directions that are 19 •-22 • different from an axial dipole field and inclinations that are 20 •-22 • steeper than an axial dipole field. The beginning of the first millennium BCE is also characterized with fast secular variation rates. The new catalog provides additional support to the Levantine Iron Age Anomaly hypothesis.

show abstract

Section: Comparison With Sedimentary Datasupporting

confidence: 69%

Section: Discussionmentioning

confidence: 59%

Section: Comparison With Sedimentary Datamentioning

confidence: 99%

See 1 more Smart Citation

The First Catalog of Archaeomagnetic Directions From Israel With 4,000 Years of Geomagnetic Secular Variations

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…Together with dating uncertainties this fact produces important inconsistencies and internal discrepancies on both regional (e.g. Tema et al, 2012;Cai et al, 2017;Shaar et al, 2017;Molina-Cardín et al, 2018) and global (e.g. Pavón-Carrasco et al, 2014a;Constable et al, 2016) data sets.…”

Section: Cautionary Note On Trm Anisotropy Correctionmentioning

confidence: 99%

New archeointensity data from NW Argentina (1300–1500 CE)

Gómez‐Paccard

Chauvin

Albeck

et al. 2019

Physics of the Earth and Planetary Interiors

View full text Add to dashboard Cite

A good characterization of the geomagnetic field strength at centennial to millennial time scales in the Southern Hemisphere is particularly crucial to disentangle the long-term evolution of the South Atlantic Anomaly (SAA), an intriguing geomagnetic feature currently observed at the Earth´s surface. Here we present 59 new archeointensities obtained from four well-dated groups of potteries with ages ranging between 1300 and 1500 AD and collected in Northwest Argentina. The new data were obtained in accordance with the Thellier paleointensity method including partial thermoremanent magnetization (pTRM) checks and TRM anisotropy and cooling rate corrections. We have also performed a comparative study of the efficiency of magnetic the susceptibility, ARM and TRM anisotropy tensors to correct the TRM anisotropy effect upon intensity estimates. Our results suggest that the magnetic susceptibility tensor systematically underestimates the TRM anisotropy effect by 10 to 30 %. Our new data, together with a selection of selected archeointensities already published, confirm that the decrease of the geomagnetic field intensity in South America started around 1600-1650 AD, due to the arrival of the SAA.

show abstract

“…Another geomagnetic anomaly centered on the Middle East has recently been proposed at the beginning of the first millennium BCE (Shaar et al, 2016;Shaar et al, 2017). 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).…”

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

View full text Add to dashboard Cite

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").

show abstract

Further evidence of the Levantine Iron Age geomagnetic anomaly from Georgian pottery

Cited by 32 publications

References 52 publications

The First Catalog of Archaeomagnetic Directions From Israel With 4,000 Years of Geomagnetic Secular Variations

The First Catalog of Archaeomagnetic Directions From Israel With 4,000 Years of Geomagnetic Secular Variations

New archeointensity data from NW Argentina (1300–1500 CE)

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

Contact Info

Product

Resources

About