Between 2019 and 2022, six new sacrificial pits (K3-K8) were excavated in the sacrificial area of the Sanxingdui Bronze Age site on the Chengdu Plain, Sichuan, yielding roughly 13,000 catalogued artefacts. As reported by the excavators in 2022, only Pit K4 had published radiocarbon dates (six AMS determinations, 1260-924 cal BC), while the dating of Pits K5 and K6 to the early Western Zhou rested on artefact-based estimates awaiting radiometric confirmation, and the systematic differences among the pits in depositional content and sequence were only beginning to be characterised. The problem remains open: through mid-2026, no radiometrically anchored chronology has been published for any pit other than K4, the functional differentiation of the pits (pits for sacrificial activity versus burial pits for ritual objects) remains a hypothesis under active testing, and Sanxingdui's relationship to contemporaneous Bronze Age urban centres is the subject of intensifying but unresolved provenance and comparative research.

Background

Sanxingdui is a Bronze Age site of roughly 12 square kilometres in Guanghan County on the Chengdu Plain, Sichuan, south-west China, occupied from approximately 2700 to 1000 BC. It is the type site of the Sanxingdui culture, a Bronze Age society of the Sichuan Basin that left no indigenous writing and is unrecorded in later Chinese historical texts. In 1986, two pits filled with deliberately damaged bronze, gold, jade, and ivory objects (Pits 1 and 2, now usually labelled K1 and K2) were discovered there and became foundational evidence that early Chinese civilisation developed in multiple regional centres rather than only in the Central Plains around the late Shang capitals. Between December 2019 and 2022, six further pits (K3-K8) were excavated in the same sacrificial area with extensive multidisciplinary recording, recovering about 13,000 catalogued artefacts, including the roughly 280 g golden mask from K5 and a cinnabar-painted wooden chest from K6.

Two conventions are needed to read the dating evidence. AMS radiocarbon dating (accelerator mass spectrometry radiocarbon dating) measures the carbon-14 content of organic material; calibrated results are expressed as calendar-year ranges written 'cal BC'. The conventional historical pegs are the Yinxu period (the phase of the late Shang dynasty, c. 1200-1046 BC, named after the Shang capital at Anyang, whose phase IV is the latest sub-phase) and the early Western Zhou dynasty (c. 1046-950 BC), which follows the Shang conquest.

At the time of the source report (Li, Qiu, Guo and Li, Antiquity, published online November 2022), the chronological framework of the new pits was this: six AMS radiocarbon dates on samples from Pit K4 indicated 1260-924 cal BC, while on the basis of artefact typology and burial pattern, Pits 1-4, 7 and 8 were estimated to fall roughly in Yinxu Phase IV (c. 1200-1000 BC) and Pits 5 and 6 'probably' in the early Western Zhou (c. 1046-950 BC). The two ranges rest on different conventions: the Yinxu period's span above (c. 1200-1046 BC) is the conventional dynastic chronology ending at the Shang-Zhou transition, whereas the artefact-based Yinxu Phase IV estimate (c. 1200-1000 BC) is an archaeological range that need not be bounded by that dynastic end. The excavators also recorded clear but unexplained differences in deposition: artefacts in Pits 3, 4, 7 and 8 lay in recognisable layers, with ivory dominating upper layers and bronze the lower layers, whereas K5 contained predominantly small gold objects and ivory products and K6 contained the painted wooden chest. They concluded that, as excavations proceeded, 'the systematic differences between the various pits, as well as their precise chronology, will become clearer', enabling a more detailed understanding of the dynamics of the Sanxingdui culture and of how it compares with other contemporaneous Bronze Age urban centres in early China.

Subsequent work has begun to fill parts of this programme. The excavation team's own report on the sacrificial area (English translation published in Chinese Archaeology in 2023) proposed a first functional differentiation: pits K5 and K6 were used for sacrificial activities, while the other pits served as burial pits for ritual objects. Scientific analyses of sediments, jades, ivories, and residues have shown that several pits received burnt material (fired sediments, burnt jade from K3 and K7, graphitic carbon on 'black' ivory), consistent with a ritual of burning offerings before burying them. A dedicated formation-process study of Pit K4 (2026) reconstructs its depositional history in detail and even questions whether the 'sacrificial pit' label is warranted for it, and interpretive work has differentiated plausible ritual modes from the bronze assemblages. Provenance studies (analyses identifying the geographic origin of raw materials) of bronze casting cores, carnelian beads, and other materials are actively mapping Sanxingdui's exchange networks with northern China and elsewhere. No radiometrically anchored date for any pit other than K4, and no systematic, evidence-linked comparative account of depositional content, sequence, and function across all six pits, has been published through mid-2026.

Problem Statement

For the six sacrificial pits (K3-K8) of the Sanxingdui site's sacrificial area, the excavators' open problem has three jointly linked components that together serve one objective — characterising the Sanxingdui sacrificial programme and the dynamics of the Sanxingdui culture; all three components are mandatory. First, establish the best-supported absolute chronology of the pits from the available evidence and specify the further determinations needed to confirm it: published AMS radiocarbon dates exist only for Pit K4 (1260-924 cal BC), so the chronology of K3, K5, K6, K7 and K8 rests on combining the K4 determinations with the artefact-based estimates, and the further radiometric anchoring required should be set out by specifying and prioritising secure, short-lived contexts (materials such as annual plants or young twigs that were alive shortly before deposition, so that their radiocarbon age would closely date the burial event) — in particular assessing whether the tentative artefact-based placement of Pits K5 and K6 in the early Western Zhou (c. 1046-950 BC) is consistent with the late Yinxu Phase IV attribution of the other pits. Second, characterise systematically the differences in depositional content, sequence, and function among K3-K8 (the questions that follow are illustrative, not an exhaustive list) — for example, whether K5 and K6 were pits for sacrificial activities while the others were burial pits for ritual objects, whether the burning-then-burial ritual attested in several pits applied to all, and how the layered ivory-over-bronze deposits of K3, K4, K7 and K8 relate to the differing fills of K5 and K6. Third, integrate the chronological and depositional results into an account of the chronological phases, rituals, and political economy of the sacrificial programme, and of Sanxingdui's relationship to contemporaneous Bronze Age urban centres in early China, including the Central Plains (Yinxu) and middle Yangtze centres.

References

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