Putting South-West England on the (strontium isotope) map: A possible origin for highly radiogenic 87Sr/86Sr values from southern Britain
Putting South-West England on the (strontium isotope) map: A possible origin for highly radiogenic 87Sr/86Sr values from southern Britain
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DOI：
10.1016/j.jas.2022.105628
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发表时间：
2022-08-01
影响因子：
2.8
通讯作者：
Rippon, Steven
中科院分区：
文献类型：
--
作者：
Muldner, Gundula;Fremondeau, Delphine;Rippon, Steven
基于锶同位素的古代迁移率重建仅与研究区域生物可利用的锶基线值的估计一样可靠。英国目前的生物圈测绘表明，坎布里亚以南没有大片区域的 87Sr/86Sr 值高于 0.714。因此，具有这种（对英国来说）“高放射性”锶同位素值的考古人类或动物通常被解释为来自苏格兰或国外。本文基于 98 个现代生物圈样本（包括 68 个新测量值）展示了英格兰西南部第一个专用的锶同位素图。来自 Cornubian 花岗岩（达特穆尔）的许多样品的 87Sr/86Sr 值高于 0.714（最大 0.7287），并且根据它们的分布，表明以前难以捉摸的“高放射性”值是土壤铷浓度高的地区的特征。它们发生在海拔较低的地方，比高沼地更适合农业和永久人类居住。考虑到这些新结果，之前对英国南部考古样本的解释可能需要修改，但它们也强调了对生物圈采样的持续需求以及地球化学图作为考古学中锶同位素研究的常规部分的有用性。
Reconstructions of ancient mobility based on strontium isotopes are only ever as reliable as estimates for baseline values of bioavailable strontium in the study area. Current biosphere mapping for Britain suggests that there are no sizeable areas hosting 87Sr/86Sr values above 0.714 south of Cumbria. As a result, archaeological humans or animals with such (for Britain) 'highly radiogenic' strontium isotope values are commonly interpreted as having moved either from Scotland or abroad. This paper presents the first dedicated strontium isotope map for SouthWest England based on 98 modern biosphere samples (including 68 new measurements). Numerous samples from the Cornubian granite (Dartmoor) have 87Sr/86Sr values above 0.714 (maximum 0.7287) and, based on their distribution, it is suggested that the previously elusive 'highly radiogenic' values are characteristic for areas where the soil has with high rubidium concentrations. These occur at lower elevations which are better suited for agriculture and permanent human settlement than the high moors. Previous interpretations of archaeological samples from southern Britain may need to be revised considering these new results, but they also highlight the continued need for biosphere sampling and the usefulness of geochemical maps as a routine part of strontium isotope investigations in archaeology.