[Rockhounds] Science News article about banded iron formations

[Kreigh Tomaszewski]

Thank you Alan!

That was great geology that explains the jaspelite (banded hematite and  
jasper) from Michigan's UP.

Kreigh


On Friday, Jul 10, 2009, at 13:17 America/Detroit, Alan Silverstein  
wrote:

> The June 20 issue of Science News contained an interesting feature
> article about new research into banded iron formations.  And apparently
> it's publically available here:
>
>    
> http://www.sciencenews.org/view/feature/id/44350/title/ 
> The_iron_record_of_Earth.s_oxygen
>
> It ties together reduction of nickel in the oceans => less methane in
> the air => "great oxidation event" => precipitation of iron and silica.
>
> I found it interesting partly because I've collected "ironwood", which
> is orange/red/purple, magnetic/hematite plus agate, in eastern Wyoming.
>
> Cheers,
> Alan Silverstein
> -- 
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