[meteorite-list] Tectite (Tektite) ages

[E.P. Grondine]

Hi Sterling, all - 

What we're seeing in regards to recent large iron
impacts (Barringer, Alaska, and Siberia) is a rain of
molten iron spherules. What we're seeing in regards to
recent cometary impacts (at 10,900 BCE) is a rain of
carbon spherules, containing high levels of 3He. 

Perhaps (once again, "Perhaps") the reason for the
identical dates for the tektites is an identical date
for the parent body, which is what they are formed
from, and not the age of the Earth's crust, as they
are not formed from that material. But Elton can speak
to large impact mechanics better than I can.

E.P. Grondine
Man and Impact in the Americas


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