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首页> 外文期刊>Quaternary geochronology >Evaluating tephrochronology in the permafrost peatlands of northern Sweden
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Evaluating tephrochronology in the permafrost peatlands of northern Sweden

机译：评估瑞典北部永久冻土泥炭泥土的Tephrochronology

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Tephrochronology is an increasingly important tool for the dating of sediment and peat profiles for palaeoecological, palaeoclimatic and archaeological research. However, although much work has been done on tephra in temperate peatlands, there have been very few in-depth investigations of permafrost peatlands. Here we present the analysis of nine peatland cores from Abisko, northern Sweden, and show that the presence of tephra layers may be highly variable even over a scale of 10 km. Using electron probe microanalysis (EPMA) combined with age-depth profiles compiled from radiocarbon (C-14) and Pb-210 dating of peat records, we identify the Hekla 1104, Hekla 1158, Hekla-Selsund and the Hekla 4 tephra layers. We also infer the presence of the Askja 1875 tephra, in addition to an unassigned tephra dating from between 1971-1987 AD in two separate cores. Five of the nine analysed cores do not contain distinct tephra layers. Volcanic ash deposits in northern Scandinavia are subject to both regional-scale variations in climate and atmospheric circulation, and local-scale variations on the order of tens of kilometres in topography, vegetation, snow cover, and ground permeability. The extreme inconsistency of tephra preservation within a small study area (similar to 3000 km(2)) brings into question the reliability of tephrochronology within permafrost peatlands, and highlights the necessity of alternative methods for dating peat profiles in this region.
机译：Tephrochronologrol是古老，古教物和考古学研究的沉积物和泥炭型材约会的越来越重要的工具。然而，虽然在温带泥炭块的Tephra在Tephra在Tephra进行了很多工作，但在永久冻土泥炭块的深入调查中已经非常少。在这里，我们展示了来自瑞典北部的Abisko，九个泥炭缘核心的分析，表明，即使在＆ 10公里。使用电子探针微透析（EPMA）与从RadioCarbon（C-14）和PB-210的泥炭记录编制的年龄深度曲线相结合，我们识别Hekla 1104，Hekla 1158，Hekla-Selsund和Hekla 4 Tephra层。除了从1971年至1987年在两个单独的核心之间的未分配Tephara约会，我们还推断出Aaskja 1875 Tephra的存在。九个分析的核中的五个不含不同的Tephra层。斯堪的纳维亚北部的火山灰矿床受到气候和大气循环的区域规模变化，以及地形，植被，雪覆盖和地面渗透率的数十公里的局部变化。 Tephra保存在小型研究区内的极端不一致（类似于3000公里（2）），提出了PEMAFROST泥炭地区的Tephrochronologics的可靠性，并突出了该地区约会泥炭型材的替代方法的必要性。

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