[meteorite-list] Tunguska Note 2

[E.P. Grondine]

Hi Eric - 

In most hypervelocity impacts the binding forces between atoms are broken,  energy freed, and the resulting plasma recondenses into spherules. 

In some of the largest hyper-velocity impacts nuclear biding forces appear to be broken, freeing neutrons and protons to formm 14C and 10Be. For example, from the looks of INTCAL98 14C production measure, the Barringer Impact may be dated ca 44,000 BCE.

E.P. Grondine
Man and Impact in the Americas