Vibranium Cancer
When a small sub-molecular imperfection was introduced into Captain America's shield, each impact over the years spread to neighboring molecules. It grew until the molecular bonds of the shield were completely broken down, shattering the shield. The shattering effect continued to spread to other vibranium, unconnected to the shield. This created a vibranium "cancer", a shock wave propagating throughout the world. It violently detonated any vibranium it found, from mineral deposits to components of ships or equipment. The shock wave was traveling to the "Great Vibranium Mound" in Wakanda, where the resulting explosion could destroy the world. With the unwitting aid of the villain Klaw, Captain America was able to stop the cancer and restore his shield.
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