Cassiterite U-Pb geochronology: A framework for tin provenance in the Bronze Age world.

Cassiterite U-Pb dating reveals that over 1,500 km of tin was transported from Northeast China to Middle Shang sites, indicating a vast ancient circulation network.

• Why it matters: Understanding the sources and movement of tin in the Bronze Age is crucial for unraveling early global trade and technological exchange, especially in East Asia where provenance data has been limited.
• What they did: The study applied U-Pb dating to cassiterite grains from various archaeological contexts, including smelting sites and hoards, to trace the origin of tin used during the Shang dynasty.
• The result: Findings demonstrate a long-distance, continent-scale metal circulation system, expanding the concept of Bronze Age globalization and providing a new methodological framework for provenance analysis.