Advances in archaeomagnetic dating in Britain: New data, new approaches and a new calibration curve

Advances in archaeomagnetic dating in Britain: New data, new approaches and a new calibration curve
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英国古磁测年的进展:新数据、新方法和新校准曲线

DOI:
10.1016/j.jas.2017.07.002
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发表时间:
2017
影响因子:
2.8
通讯作者:
Batt C
Batt C
中科院分区:
地球科学2区
文献类型:
--
作者:
Batt C

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古地磁测年为考古调查提供了一个有价值的年代学工具,特别是对测定烧制材料的年代。该方法依赖于建立一个过时的记录地球磁场的长期变化,本文提出了新的和更新的考古地磁方向数据从英国和地磁长期变化曲线所产生的。这些数据取自20世纪50年代至今的出版物;重新评估了来自现有考古和地磁数据库的422个日期条目,并添加了487个新方向,从而产生了909个具有相应日期的条目,这是单个国家最大的日期考古地磁方向集合。一种方法来改善最大的不确定性来源,独立定年,提出并应用于英国铁器时代,导致145个方向,从目前可用的数据库正在更新修订的年龄和/或不确定性,并大规模重新评估的年龄分配之前,列入过去的磁矩和GEOMAGIA50数据库。从显着改进的数据集,一个新的考古地磁测年曲线为英国推导出一个时间上连续的地磁场模型的发展,并与以前的英国考古地磁测年曲线和全球场模型进行比较。新的模型,ARCH-UK. 1允许模型预测在英国的任何位置与相关的不确定性。它被证明可以提高古地磁定年的精度和准确性,并为过去的地磁场变化提供新的见解。
Archaeomagnetic dating offers a valuable chronological tool for archaeological investigations, particularly for dating fired material. The method depends on the establishment of a dated record of secular variation of the Earth's magnetic field and this paper presents new and updated archaeomagnetic directional data from the UK and geomagnetic secular variation curves arising from them. The data are taken from publications from the 1950's to the present day; 422 dated entries derived from existing archaeo and geomagnetic databases are re-evaluated and 487 new directions added, resulting in 909 entries with corresponding dates, the largest collection of dated archaeomagnetic directions from a single country. An approach to improving the largest source of uncertainty, the independent dating, is proposed and applied to the British Iron Age, resulting in 145 directions from currently available databases being updated with revised ages and/or uncertainties, and a large scale reassessment of age assignments prior to inclusion into the Magnetic Moments of the Past and GEOMAGIA50 databases. From the significantly improved dataset a new archaeomagnetic dating curve for the UK is derived through the development of a temporally continuous geomagnetic field model, and is compared with previous UK archaeomagnetic dating curves and global field models. The new model, ARCH-UK.1 allows model predictions for any location in the UK with associated uncertainties. It is shown to improve precision and accuracy in archaeomagnetic dating, and to provide new insight into past geomagnetic field changes.
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