Re: Geology of a recently terraformed planet
In article <Tillman-EBB7B3.10585218022006@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Peter D. Tillman <Tillman@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Very likely, few or no significant metallic-mineral deposits, either
(including uranium). Since it's likely that almost all such deposits,
here on earth, are biologically-mediated, and formed in the 10 exp4 to
10exp6 year age-range. [1]
10^4 to 10^6 years seems incredibly young -- wasn't the Gabon natural
reactor pure enough uranium-compound to sustain fission two gigayears
ago, aren't the banded iron ore formations things that date from the
advent of oxygen-producing life a gigayear or so back?
Tom
.
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(talk.origins) |
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