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Abstract

One of the greatest enigmas in the study of Bronze Age China is the source of highly radiogenic lead discovered in the copper-based objects of the Shang period (ca. 1500–1046 BC). Although being relatively rare in nature, such lead contributed over half of the lead consumed across a vast area from the Yellow River to the Yangtze. Identifying its source and supply network would significantly contribute to our understanding of how China achieved the largest metal production across Eurasia. The past thirty years of research have seen various proposals for the origin of this lead, including south-western China, the middle Yangtze River valley, the Qinling and Zhongtiao mountains, and even Africa. This paper attempts to illustrate the tempero-spatial pattern of this highly radiogenic lead using the largest possible databank. Furthermore, by going beyond the bronze data and investigating lead isotopes in non-metal objects, we confirm that multiple sources of highly radiogenic lead must have been used across Chinese history. In turn, this implies the feasibility of a multi-source model for the lead in the Shang bronzes.

Abstract

Anyang, the last capital of the Chinese Shang dynasty, became one of the largest metal consumers in Eurasia during the second millennium BCE. However, it remains unclear how Anyang people managed to sustain such a large supply of metal. By considering the chemical analysis of bronze objects within archaeological contexts, this paper shows that the casting and circulation of metal at Anyang was effectively governed by social hierarchy. Objects belonging to the high elites such as Fuhao, particularly the bronze ritual vessels, were made by carefully controlled alloying practice (primary) using very pure copper, whereas the lower elites only had access to bronzes made by secondary alloying practice and copper with more impurities. Such contrasts allow scholars to identify those objects which are less likely to have been made by mixing and recycling, which has very important implications for the chemical and isotopic determination of provenance for future studies.

The role of Panlongcheng-a walled settlement on the Yangtze River with obvious links to the Erligang capital at Zhengzhou, ~ 500 km to the north-in early Bronze Age China has been the subject of much debate. Panlongcheng is a typical Erligang site (~ 1500-1300 BC), with evidence for people of elite status, unlike any other site apart from Zhengzhou itself. The tombs and bronzes at Panlongcheng, as well as other materials, closely resemble those at Zhengzhou. Why was Panlongcheng established along the Yangtze River, and what were the Erligang elites doing there? Considering the rich copper deposits in this area, it is widely assumed that the major function of Panlongcheng was to ship metal to Zhengzhou, and in return to receive bronze vessels from Zhengzhou. The purpose of this paper is to revisit this discussion through a re-evaluation of the scientific data on the bronzes from each site. A series of differences and similarities in the chemical and isotopic compositions of the metal objects at Panlongcheng and Zhengzhou are identified, suggesting that the relationship was more complex than was previously thought. In this light, despite a close social and presumably political affiliation with Zhengzhou, Panlongcheng appears likely to have had its own metal-casting capability, rather than having to rely completely on finished objects imported from Zhengzhou. This discovery encourages scholars to reconsider the metal supply network and the underlying political landscape in early dynastic China, shifting from a linear model to a complex but probably more realistic one.

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Ancient China is one of the most important regions for the development of agriculture in human history, contributing the two key crops millet and rice. Meanwhile, it was closely connected to the wider Eurasian network, receiving wheat and barley from the West. Because of the large isotopic differences between C3 and C4 crops, we are able to track their changing importance in different regions of China and underlying connections to their cultural and environmental contexts. We take a ‘big data’ approach, assembling the stable isotopic measurements on over 2000 ancient human bones. This is the first comprehensive meta-analysis of ancient Chinese human stable carbon and nitrogen isotope results and creates a more efficient tool for scholars to establish a fuller picture of dietary practices in ancient China. By charting their spatial-temporal variation, we can show that the primary crop facilitating the rise of the early Chinese state in the Central Plains was millet, particularly during the Bronze Age. The dominance of millet (C4), from an isotopic viewpoint, offers an opportunity to investigate the major changes in dietary practice through the proxy of δ13C, as a result of shifts between millet and other major C3 crops (rice, wheat and barley). More importantly, millet is probably one of the earliest examples for the existing local system in the Central Plains within which other imported elements (e.g. wheat) have to fit. This pattern, which has also been repetitively discovered with bronze and iron technology in later periods, starts to characterise some intrinsic features of Chinese prehistory.