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DOI	10.1016/j.epsl.2019.116047
	Two archaeomagnetic intensity maxima and rapid directional variation rates during the Early Iron Age observed at Iberian coordinates. Implications on the evolution of the Levantine Iron Age Anomaly
	Osete M.L.; Molina-Cardín A.; Campuzano S.A.; Aguilella-Arzo G.; Barrachina-Ibañez A.; Falomir-Granell F.; Oliver Foix A.; Gómez-Paccard M.; Martín-Hernández F.; Palencia-Ortas A.; Pavón-Carrasco F.J.; Rivero-Montero M.
发表日期	2020
ISSN	0012821X
卷号	533
英文摘要	Variations of geomagnetic field in the Iberian Peninsula prior to Late Iron Age times are poorly constrained. Here we report 14 directional and 10 palaeointensity results from an archaeomagnetic study carried out on 17 combustion structures recovered from six archaeological sites in eastern Spain. The studied materials have been dated by archaeological evidences and supported by radiocarbon dates (8th-5th centuries BC). Rock magnetic experiments indicate that the characteristic remanent magnetization is carried by a low coercivity magnetic phase with Curie temperatures of 500-575 °C, most likely titanomagnetite/maghemite with low titanium content. Archaeointensity determinations were carried out by using the classical Thellier-Thellier experiment including pTRM-checks and magnetic anisotropy corrections. A new full vector Iberian Paleosecular Variation Curve for the Iron Age is presented. High fluctuation rates on both directions and intensities are observed during the Early Iron times that seems to be related with the Levantine Iron Age Anomaly (LIAA), the most prominent anomaly of the geomagnetic field of the last three millennia. Two intensity maxima were observed at Iberian coordinates, the oldest around 750 BC (associated with easterly declinations of around 23°) and the second 275 yrs later (475 BC) with northerly directions. The related virtual axial dipole moment was up to 14⋅1022 Am2 for the oldest materials (750 BC) and reaching 16⋅1022 Am2 for the materials corresponding to the end of the Early Iron Age. In order to investigate the origin of the unusually high fluctuations of the palaeofield we have developed a new global geomagnetic field reconstruction, the SHAWQ-IronAge model, which is based on a critical revision of the global archeomagnetic and volcanic dataset. The new model provides an improved description of the evolution of the LIAA, which is related to a normal flux patch at the core-mantle boundary (CMB) below Arabian Peninsula clearly observed at around 950 BC. This flux patch expanded towards the north-west, while decreasing in intensity, reaching Iberia at around 750 BC. Around 600-500 BC, it underwent a revival below the European continent after that it seems to vanish in situ. © 2019 Elsevier B.V.
关键词	archaeointensity archaeomagnetism geomagnetic modelling Iberian Peninsula Levantine Iron Age Anomaly (LIAA)secular variation
英文关键词	Geomagnetism; Lithology; Magnetic anisotropy; Archaeointensity; archaeomagnetism; Iberian Peninsula; Iron age; Secular variation; Iron; archaeology; Curie point; geomagnetic field; Iron Age; paleointensity; paleomagnetism; secular variation; titanium; Iberian Peninsula
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202821
作者单位	Departamento de Física de la Tierra, Astronomía y Astrofísica I (Geofísica y Meteorología), Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Plaza de las Ciencias 1, Madrid, 28040, Spain; Instituto de Geociencias (UCM-CSIC), Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Avda Complutense s/n, Madrid, 28040, Spain; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma 2, Via di Vigna Murata 605, Roma, 00143, Italy; Servicio de Investigaciones Arqueológicas y Prehistórica de la Diputación de Castellón, Museu Belles Arts, Av. Germans Bou, 28Castelló 12003, Spain
推荐引用方式 GB/T 7714	Osete M.L.,Molina-Cardín A.,Campuzano S.A.,et al. Two archaeomagnetic intensity maxima and rapid directional variation rates during the Early Iron Age observed at Iberian coordinates. Implications on the evolution of the Levantine Iron Age Anomaly[J],2020,533.
APA	Osete M.L..,Molina-Cardín A..,Campuzano S.A..,Aguilella-Arzo G..,Barrachina-Ibañez A..,...&Rivero-Montero M..(2020).Two archaeomagnetic intensity maxima and rapid directional variation rates during the Early Iron Age observed at Iberian coordinates. Implications on the evolution of the Levantine Iron Age Anomaly.Earth and Planetary Science Letters,533.
MLA	Osete M.L.,et al."Two archaeomagnetic intensity maxima and rapid directional variation rates during the Early Iron Age observed at Iberian coordinates. Implications on the evolution of the Levantine Iron Age Anomaly".Earth and Planetary Science Letters 533(2020).