陕西洛南绿松石的锶同位素特征及其产地意义——兼论二里头出土绿松石的产源
Research on the Source Characteristics of Luonan Turquoise by Using Strontium Isotopic Method
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摘要: 陕西洛南县河口绿松石采矿遗址距今约4 000年，为中国目前最早的一处绿松石采矿遗址。为判定该古矿出产绿松石的流向和中国古代绿松石矿料的来源，尝试利用固体热电离高精度质谱计检测秦岭东段5处绿松石矿样品的Sr同位素比值，进而对不同产地绿松石开展产源判别研究，期望为绿松石产源示踪提供帮助。结果发现：Sr同位素比值可以以0.710 5和0.716 5为界划分为3个聚集区。随之建立Sr含量和Sr同位素二元散点图，发现Sr的地球化学特征能够在一定程度上实现对不同产地绿松石的产源区分。运用该区分成果，发现二里头出土的绿松石废料与洛南古矿有着较为密切的关系。该研究为寻找河口古矿的绿松石流向提供帮助，也为开展绿松石文物产源研究提供技术支持。Abstract: The discovery of the Hekou ancient turquoise mining site in Shaanxi provides significant information for the provenance of turquoise in early China. High Precision Mass Spectrometer has been employed to try to detect the strontium isotopic composition of the turquoise samples that from five mines in the eastern Qinling Mountains. And then, the respective habitat characteristics of these turquoise samples have been identified and analyzed. The result shows that the strontium isotope ratio (87Sr/86Sr) of turquoise can be divided into three groups, with a range of 0.710 5 to 0.716 5. If the content of Strontium has been put into consider, the separation effect can be improved. Combined with the content data of the trace element Sr, a model for distinguishing different origins of turquoise has been established. Through using this model to test the turquoise from the Erlitou site, the result suggests that the Erlitou turquoise was likely to come from the Luonan ancient turquoise mine.
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Key words:
- turquoise /
- strontium isotope /
- habitat discrimination /
- Erlitou site
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