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Both he and I were off duty and the weather was below freezing with sleet falling. We were out for about 1.5hrs. I came in and laid my .45 Colt 1911 on the nightstand. It was not cocked but had a round in the chamber.
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With the caveat that I know very little about the workings of a 1911, my lame guess is that it involved the rapid warming of the 1911 with a round in the chamber and the hammer down: As the chambered round quickly warmed up, the primer and its components expanded. But since the hammer was down, the expanding primer couldn't go much further backward and eventually forced the anvil hard against the propellant, setting the gun off. Would explain the lack of dimple, and maybe even the unseated primer.