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目前北美出土的铜器中既有北美土著居民用自然铜矿直接打制的铜器,也有用欧洲冶炼铜加工而成的铜器。长期以来,如何区分二者并探寻这些出土铜器的矿料来源一直是北美考古学者十分关注的课题。利用石墨炉原子吸收光谱法(GF-AAS)对北美多个矿区的55件自然铜样品进行铅含量测定,北美出土的自然铜铜器与欧洲冶炼铜中的铅含量具有显著差异。因此,铅含量可考虑用作区分北美自然铜铜器和欧洲冶炼铜铜器的一个指标。自然铜矿的铅含量分析结果对于北美自然铜的微量元素以及铅同位素考古探源分析也具有一定的指导价值和参考意义。
At present, North American unearthed bronze both native North American natives use natural copper directly produced bronze, but also with the European smelting copper processing made of bronze. For a long time, how to differentiate the two and explore the source of the mineral resources of these unearthed bronzes has always been a topic of great concern to archaeologists in North America. Lead content was determined by graphite furnace atomic absorption spectrometry (GF-AAS) on 55 natural copper samples from several mines in North America. There was a significant difference between lead content of natural copper bronze unearthed in North America and that of European smelting copper. Therefore, lead content may be considered as an indicator of the distinction between natural copper bronze in North America and copper smelter in Europe. The results of lead content analysis of natural copper ore also have certain guiding value and reference significance for the trace elements of natural copper in North America and the analysis of lead isotope archeology.