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A New Method For Combining Lead Isotope and Lead Abundance Data to Characterize Archaeological Copper Alloys*

机译:结合铅同位素和铅丰度数据表征考古铜合金的新方法*

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摘要

We present a new methodology for interpreting lead isotope data from archaeological copper alloy objects. It is not based on the conventional isotope ratio biplots, which were originally devised to allow the calculation of the geological age of the lead mineralization, but is derived from isotope mixing models, more often used for presenting strontium isotope data. We illustrate the method by reworking published data on Sardinian Nuragic oxhide ingots and copper alloy artefacts. While we confirm the consensus assumption that the oxhide ingot fragments found on Sardinia are isotopically consistent with Cypriot copper ores (although we see no isotopic reason to favour only Apliki, as originally suggested), we also show that there is evidence for mixing between local and ingot copper in some objects, which was previously not detected. More broadly, we suspect that the apparent mismatch between some source allocations for copper drawn from isotope geochemistry and the rest of the archaeological data in some cases might be due to mixed isotopic signals being incorrectly assigned to a specific source, and suggest that the method presented here will reduce the chances of this happening.
机译:我们提出了一种新的方法来解释考古铜合金物体中的铅同位素数据。它不是基于常规的同位素比双象限图,该方法最初是为了计算铅矿化的地质年龄而设计的,而是从同位素混合模型中得出的,该模型通常用于表示锶同位素数据。我们通过修改已发布的撒丁岛Nuragic牛皮和铜合金制品的数据来说明该方法。尽管我们确认了一致的假设,即撒丁岛上发现的氧化锡锭碎片与塞浦路斯铜矿石在同位素上是一致的(尽管正如最初所建议的那样,我们没有同位素理由只偏爱Apliki),但我们也表明,有证据表明本地和本地混合某些物体中以前没有检测到的铜锭。更广泛地说,我们怀疑在某些情况下,从同位素地球化学中提取的铜的某些来源分配与其余考古数据之间的明显不匹配,可能是由于混合同位素信号未正确分配给特定来源所致,因此建议采用该方法这将减少发生这种情况的机会。

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