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New high precision full-vector archaeomagnetic data from a roman kiln in MÉRIDA (Spain)
Physics of the Earth and Planetary Interiors ( IF 2.3 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.pepi.2020.106591
N. García-Redondo , M. Calvo-Rathert , A. Carrancho , M. Bustamante-Álvarez

Abstract This study presents new high precision age and full-vector archaeomagnetic data from a kiln excavated in the Roman archaeological site of Mitreo's house (Merida, Badajoz, Spain). The age of the kiln was obtained by the stratigraphic method and by the ceramological study of the italic and sigillata pottery found with a very precise age date of 55 ± 15 years AD. Rock-magnetic experiments pointed towards magnetite as the main carrier of remanence and highly reversible thermomagnetic curves suggested that the studied samples were suitable for archaeoeointensity determinations.Paleomagnetic experiments including thermal and stepwise alternating field demagnetization yielded the following mean direction for the kiln: declination D = 0.6°; inclination I = 54.0°; (k = 481; α95 = 2.5°). Archaeointensityexperiments with the Thellier – Coe protocol on 28 samples yielded successful determinations in 27 cases. Anisotropy factors between 0.90 and 1.04 were obtained from anisotropy of thermoremanent magnetization (ATRM) experiments. A mean anisotropy-corrected archaeointensity value F = 56.3 ± 5.5 μT was obtained. The geomagnetic model SHA.DIF.14 k was used for an archaeomagnetic dating yielding a chronological interval between 40 BCEE and 150 CE. This low age resolution when compared with the pottery-based age data is related to the behavior of the geomagnetic field in the Iberian Peninsula during the Roman period, which does not allow to differentiate well between results corresponding to those centuries. However, it is also related to the fact that the Iberian archaeomagnetic dataset in the analysed time range is highly scattered. A high quality full-vector data with a very precise age have been obtained which contribute to improve the Iberian secular variation curve and geomagnetic databases.

中文翻译:

来自梅里达(西班牙)罗马窑炉的全新高精度全矢量古地磁数据

摘要 本研究提供了新的高精度年龄和全矢量考古磁数据,该数据来自在 Mitreo 家(梅里达,巴达霍斯,西班牙)的罗马考古遗址中挖掘的窑。窑的年龄是通过地层学方法和通过斜体和 sigillata 陶器的陶瓷学研究获得的,这些陶器的年龄非常精确,为公元 55 ± 15 年。岩磁实验表明,磁铁矿是剩磁的主要载体,高度可逆的热磁曲线表明,所研究的样品适合于古代强度的测定。包括热和逐步交变场退磁在内的古地磁实验得出了以下窑炉的平均方向:偏角 D = 0.6°;倾角 I = 54.0°;(k = 481;α95 = 2.5°)。使用 Thellier-Coe 协议对 28 个样品进行的考古强度实验在 27 个案例中获得了成功的测定结果。从热剩磁 (ATRM) 实验的各向异性获得了介于 0.90 和 1.04 之间的各向异性因子。获得了平均各向异性校正的考古强度值 F = 56.3 ± 5.5 μT。地磁模型 SHA.DIF.14 k 用于古地磁测年,其时间间隔为公元前 40 年至公元 150 年。与基于陶器的年龄数据相比,这种低年龄分辨率与罗马时期伊比利亚半岛的地磁场行为有关,这无法很好地区分对应于这些世纪的结果。然而,这也与分析时间范围内的伊比利亚古地磁数据集高度分散有关。
更新日期:2020-12-01
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