Bitumen from north-eastern Mesopotamian seeps was exchanged across the Tigris and the Euphrates in antiquity. Nonetheless, recent research proposed a decline in its trade during the Bronze Age alongside the boost of central Mesopotamian (Hit) seeps trade. This paper presents new provenance studies from ancient bitumen recovered at Tell Lashkir, a 4th-2nd millennium BC settlement between the lower and upper Zab Tigris tributaries. The novel application of Bayesian mixing models to biomarker and isotopic data has narrowed down the identification of the bitumen putative sources and improved the apportionment of mixtures. This placed Tell Lashkir within the pathway of bitumen active trade routes in the Bronze Age. Thus, the population inhabiting Tell Lashkir participated in exchange networks which reached southern Mesopotamia, and traded with natural resources most probably originating from central and north-eastern Mesopotamia. From a methodological standpoint, the appraisal of the Bayesian mixing models in our study with modern and archaeological reference samples has provided a better understanding of the strengths and limitations of such an approach to apportion bitumen sources from several Bronze age territories.

古代美索不达米亚东北部渗出的沥青在底格里斯河和幼发拉底河之间交换。尽管如此，最近的研究表明，随着中部美索不达米亚（Hit）渗出贸易的增加，青铜时代的贸易量下降。本文介绍了在 Tell Lashkir 回收的古代沥青的新来源研究，Tell Lashkir 是位于 Zab Tigris 上下支流之间的公元前 4 至 2 千年定居点。贝叶斯混合模型在生物标志物和同位素数据中的新应用缩小了沥青推定来源的识别范围，并改进了混合物的分配。这将泰尔拉什基尔置于青铜时代活跃的沥青贸易路线中。因此，居住在泰尔拉什基尔的居民参与了到达美索不达米亚南部的交换网络，并与最有可能来自美索不达米亚中部和东北部的自然资源进行交易。从方法论的角度来看，我们研究中的贝叶斯混合模型与现代和考古参考样本的评估使我们更好地了解了这种分配来自几个青铜时代地区的沥青来源的方法的优势和局限性。