Establishing a first archaeointensity record for the SW Pacific
Establishing a first archaeointensity record for the SW Pacific
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DOI：
10.1016/j.epsl.2010.07.031
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发表时间：
2010-09
影响因子：
5.3
通讯作者：
F. Stark;J. Cassidy;M. Hill;J. Shaw;P. Sheppard
中科院分区：
文献类型：
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作者：
F. Stark;J. Cassidy;M. Hill;J. Shaw;P. Sheppard
南半球考古地磁强度资料的缺乏是评估全新世全球地磁演化模式的一个限制因素。在这里，我们展示了来自约克公爵群岛，斐济和瓦努阿图西南太平洋的34个陶瓷碎片（21个考古背景）的高质量微波考古强度数据。校正各向异性后的互补泰勒实验结果与微波实验结果吻合较好。250AD之前的大多数新数据显示出明显低于当前全球场模型（CALS3k）预测的强度。3和ARCH3k)，在250BC时的最小视强度低至现今场强的50%。在公元400 - 1500年间，数据与全球场模型基本一致，但在公元1200 - 1400年间，数据高出20%。因此，这些新的结果意味着地磁场的变化范围比预测的要大，而且来自该地区的进一步数据对于更好地约束全球磁场模型是必不可少的。研究结果还表明，建立西南太平洋陶瓷制品的古磁参考曲线是可行的，这对太平洋考古研究具有潜在的重要意义。
The dearth of archaeomagnetic intensity data from the southern hemisphere is a limiting factor in evaluating models of global geomagnetic field evolution during the Holocene. Here we present high quality microwave archaeointensity data obtained from 34 ceramic fragments (21 archaeological contexts) from the Duke of York Islands, Fiji and Vanuatu, SW Pacific. Complementary Thellier-type experiments, corrected for anisotropy give good agreement with the microwave results. The majority of the new data prior to 250AD exhibit significantly lower intensity than predicted by current global field models (CALS3k.3 and ARCH3k) for the region, with an apparent intensity minimum at 250BC reaching as low as 50% of the present-day field strength. Between 400AD and 1500AD, the data are broadly consistent with the global field models but with a 20% higher field between 1200 and 1400AD. These new results therefore imply that the geomagnetic field has a greater range of variability than predicted and that further data from the region are essential to better constrain the global field models. The results also demonstrate that establishing an archaeomagnetic reference curve for dating SW Pacific ceramic artefacts is feasible, which has potentially significant implications for Pacific archaeological research.