Rapid Intensity Decrease During the Second Half of the First Millennium BCE in Central Asia and Global Implications

Bonilla-Alba, Raquel; Gómez‐Paccard, Miriam; Pavón-Carrasco, Fco. Javier; Rı́o, Joaquı́n Del; Beamud, Elisabet; Ferreras, Verònica Martínez; Gurt-Esparraguera, J. M.; Gil, Enrique Ariño; Palencia-Ortas, A.; Martín-Hernández, F.; Chauvin, Annick; Osete, M. L.

doi:10.1029/2021jb022011

Cited by 2 publications

(9 citation statements)

References 74 publications

(137 reference statements)

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“…In our previous study (Bonilla-Alba et al, 2021), we already suggested that the V-shaped intensity feature may have originated from a non-dipole contribution of the geomagnetic field. The new intensity data acquired here further corroborate this V-shaped pattern and contribute to a refined definition of the increasing branch by revealing high intensities at the end of the second century CE.…”

Section: Evidences Of a Non-dipole Field Contribution In Central Asia...mentioning

confidence: 84%

“…Based on the preceding description, our primary focus now centers on geomagnetic field changes within the time frame spanning from 400 BCE to 400 CE, where the most important differences between robust data and models are observed. For the following discussion we considered the new data obtained here along with the data obtained in our previous study (Bonilla-Alba et al, 2021). Any previous data that do not meet modern standards of quality (represented by gray dots in Figure 5) have been excluded from our interpretation.…”

Section: First Full-vector Archeomagnetic Data From Central Asia: Com...mentioning

confidence: 99%

“…In our study, NRM-TRM plots were analyzed using a set of quality criteria similar to those used in our earlier research on pottery fragments from Uzbekistan. For a detailed description of the selection criteria applied, please refer to Bonilla-Alba et al (2021). Figure 3 displays representative Arai plots together with the corresponding Zijderveld diagrams.…”

Section: First Full-vector Archeomagnetic Data From Central Asiamentioning

confidence: 99%

“…The data and the models' results are plotted in Figure 5. Furthermore, we included the paleosecular intensity curve published for Central Asia in our previous study (Bonilla-Alba et al, 2021), which was established for the time frame spanning from 600 BCE to 600 CE.…”

Section: First Full-vector Archeomagnetic Data From Central Asia: Com...mentioning

confidence: 99%

“…In terms of directional archeomagnetic data, no declination values have ever been provided for this region, and limited inclination information is available (Brown et al, 2015(Brown et al, updated in 2021and references therein). While intensity is the most extensively documented geomagnetic field element, with more than 250 entries, it is important to note that the majority of archeointensities fail to meet the minimum quality criteria commonly applied in modern studies (please, see Bonilla-Alba et al, 2021 for a deeper discussion). Therefore, the new full-vector data presented here will enhance the existing database that defines the geomagnetic field changes in Central Asia and, consequently, will help improve future global paleoreconstructions.…”

Section: Introductionmentioning

confidence: 99%

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First Full‐Vector Archeomagnetic Data From Central Asia (3 BCE to 15 CE Centuries): Evidence for a Large Non‐Dipole Field Contribution Around the First Century BCE

Bonilla‐Alba,

Gómez‐Paccard,

Pavón‐Carrasco

et al. 2024

JGR Solid Earth

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Unraveling the short‐term behavior of the Earth's past geomagnetic field at regional scales is crucial for understanding its global behavior and, thus, the dynamics of the deep Earth. In this context, obtaining accurate full‐vector geomagnetic field records from regions where archeomagnetic data are absent becomes essential. Here, we present the first full‐vector archeomagnetic data from Central Asia, derived from the analysis of nine archeological kilns sampled in South Uzbekistan, dating back to the period between 200 BCE and 1429 CE. To obtain these new data, we conducted thermal and alternating field demagnetization procedures, along with Thellier‐Thellier paleointensity experiments, including partial thermoremanent magnetization checks, thermoremanent magnetization anisotropy and cooling rate corrections. The comparison between the new data, previous selected data from Central Asia, and available global models reveals important differences between approximately 400 BCE and 400 CE, especially concerning the geomagnetic field intensity element. In order to investigate this in detail, we have developed a regional update of the SHAWQ global models family by incorporating, for the first time, high‐quality data from Central Asia. The results suggest that this deviation is linked to non‐dipolar sources of the geomagnetic field in Central Asia reaching a maximum contribution around the first century BCE. According to the updated global paleoreconstruction, this non‐dipole feature, manifested at the Earth's surface as low intensities, is associated with the presence of a reversed flux patch at the core‐mantle boundary beneath this region.

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Section: Evidences Of a Non-dipole Field Contribution In Central Asia...mentioning

confidence: 84%

Section: First Full-vector Archeomagnetic Data From Central Asia: Com...mentioning

confidence: 99%

Section: First Full-vector Archeomagnetic Data From Central Asiamentioning

confidence: 99%

Section: First Full-vector Archeomagnetic Data From Central Asia: Com...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

First Full‐Vector Archeomagnetic Data From Central Asia (3 BCE to 15 CE Centuries): Evidence for a Large Non‐Dipole Field Contribution Around the First Century BCE

Bonilla‐Alba,

Gómez‐Paccard,

Pavón‐Carrasco

et al. 2024

JGR Solid Earth

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Geomagnetic Field Intensity During the First Millennium BCE From Royal Judean Storage Jars: Constraining the Duration of the Levantine Iron Age Anomaly

Hassul,

Shaar,

Vaknin

et al. 2024

Geochem Geophys Geosyst

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The rich and extensively studied archaeological record of the Near East provides an opportunity to develop a comprehensive archaeomagnetic dataset for exploring the behavior of the geomagnetic field with high precision. The Levantine archaeomagnetic curve (LAC) project is an ongoing effort to develop a continuous high‐resolution geomagnetic intensity curve for the Levant and Mesopotamia. The first version of the LAC covered the period between 3000 and 550 BCE. Here, we report archaeointensity data from 169 samples compiled into 32 groups dating between the 7th and the 1st centuries BCE aiming at extending the LAC up to the end of the first millennium BCE. Twenty‐two groups are assembled from storage jar handles bearing different types of royal seal impressions, which were used in Judah as part of a taxation administrative system. These groups are combined with 10 other groups of pottery assemblages, three of which are from Hellenistic destruction layers dated using radiocarbon and coins. The new curve shows that the Levantine Iron Age Anomaly (LIAA) spanned 550 years (1100 ‐ 550 BCE) and that the rate of decline during the last spike around 600 BCE could have reached ∼0.6 μT/year. During the 6th century, the virtual axial dipole moment (VADM) dropped from 160 ZAm2 to 125 ZAm2 after which field intensity only slightly increased to 135 ZAm2, until another considerable decline to ∼90 ZAm2 during the 3rd to the 1st centuries BCE. We highlight the archaeomagnetic implication of the new curve in inferring the relative chronological relationship between different stamp types.

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Rapid Intensity Decrease During the Second Half of the First Millennium BCE in Central Asia and Global Implications

Abstract: The geomagnetic field measured at the Earth's surface is the result of various sources. The main field, generated in the outer core, has changed over time at different time scales, varying from years (geomagnetic jerks)

Cited by 2 publications

References 74 publications

First Full‐Vector Archeomagnetic Data From Central Asia (3 BCE to 15 CE Centuries): Evidence for a Large Non‐Dipole Field Contribution Around the First Century BCE

First Full‐Vector Archeomagnetic Data From Central Asia (3 BCE to 15 CE Centuries): Evidence for a Large Non‐Dipole Field Contribution Around the First Century BCE

Geomagnetic Field Intensity During the First Millennium BCE From Royal Judean Storage Jars: Constraining the Duration of the Levantine Iron Age Anomaly

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