Combined archaeomagnetic and thermoluminescence study of a brick kiln excavated at Fontanetto Po (Vercelli, Northern Italy)
Combined archaeomagnetic and thermoluminescence study of a brick kiln excavated at Fontanetto Po (Vercelli, Northern Italy)
复制标题
对丰塔内托波（意大利北部韦尔切利）出土的砖窑进行考古磁学和热释光联合研究
DOI：
10.1016/j.jas.2012.12.011
复制
发表时间：
2013
影响因子：
2.8
通讯作者：
M. Gulmini
中科院分区：
文献类型：
--
作者：
E. Tema;F. Fantino;E. Ferrara;A. Giudice;J. Morales;A. Goguitchaichvili;P. Camps;F. Barello;M. Gulmini
在意大利韦尔切利省沿着Fontanetto Po村南部边界的稻田下安装甲烷气体管道时发现了一个窑炉，作为抢救性考古发掘的一部分，对该窑炉进行了考古磁力和热释光联合研究。共收集了23个独立的砖样，用测斜仪在原地定向;由于窑下有金属管，窑上有塑料盖，因此无法使用磁罗盘和太阳罗盘。标准的考古地磁程序用于确定考古地磁倾角和绝对地磁强度。分步热退磁显示出非常稳定的特征剩磁，计算出23个样品的平均磁倾角为I = 65.3°，α95= 2.4°，k = 156。利用Coe改进的经典Thellier方法进行了磁感应强度实验，并进行了定期的部分热释电磁化（pTRM）检查。研究了冷却速率和剩磁各向异性对热释磁磁化（TRM）的影响。使用对应于线性NRM-TRM图的总共19个古强度测定值（样本水平）计算研究中心平均古强度，即46.4 ± 2.9 μT。古地磁测年结果显示，在过去1000年中，有两个可能的测年间隔，以95%的置信区间计算：第一个是从公元1511年到1614年，第二个是从公元1768年到1872年。热释光（TL）的研究也进行了两个砖样品从窑的内壁，使用传统的实验室程序。根据热释光的结果，窑的最后一次使用是在公元1796年和1914年之间。这一年龄与考古地磁分析得到的第二个测年区间吻合得很好。结合考古磁性和热释光的结果表明，最后一次烧制的窑可能发生在18世纪末和20世纪初。
A combined archaeomagnetic and thermoluminescence study was carried out as part of a rescue archaeological excavation on a kiln discovered during the installation of methane gas pipelines beneath a rice field, along the southern border of Fontanetto Po village (Vercelli province, Italy). A total of 23 independent brick samples have been collected, oriented in situ with an inclinometer; the use of magnetic and sun compass was not possible due to the existence of metallic tubes beneath the kiln and a plastic cover above it. Standard archaeomagnetic procedures have been used for the determination of the archaeomagnetic inclination and absolute geomagnetic intensity. Stepwise thermal demagnetization shows a very stable characteristic remanent magnetization and the calculated mean inclination of the 23 samples is I = 65.3° with α95= 2.4° and k = 156. Archaeointensity experiments have been performed using the classical Thellier method as modified by Coe, with regular partial thermoremanent magnetization (pTRM) checks. The cooling rate and remanence anisotropy effects upon thermoremanent magnetization (TRM) have been investigated in all the specimens. A total of 19 archaeointensity determinations (at specimen level) that correspond to linear NRM–TRM plots were used for the calculation of the site mean archaeointensity that is 46.4 ± 2.9 μT. Archaeomagnetic dating results show two possible dating intervals for the last 1000 years, calculated at 95% confidence interval: a first one from 1511 to 1614 AD, and a second one from 1768 to 1872 AD. Thermoluminescence (TL) study has been also performed on two brick samples from the kiln's internal wall, using conventional laboratory procedures. According to the thermoluminescence results the kiln's last usage lies between 1796 and 1914 AD. This age is in good agreement with the second dating interval obtained by the archaeomagnetic analysis. The combined archaeomagnetic and thermoluminescence results suggest that the last firing of the kiln could have occurred between the end of the 18th century and the beginning of 20th century.