[Rockhounds] Another extinction impact-13 KYA

[Dora Smith]

I recall iridium specifically being associated with certain catastrophic 
volcanos that could be associated wtih extinction events.  Such volcanos 
have both unusual force and unusual depth, and a few other forces that dont' 
happen with ordinary volcanos.

Yours,
Dora Smith
Austin, TX
tiggernut24 at yahoo.com
----- Original Message ----- 
From: "Kreigh Tomaszewski" <Kreigh at Tomaszewski.net>
To: "Dora Smith" <tiggernut24 at yahoo.com>; "Rockhounds at drizzle.com: A mailing 
list for rock and gem collectors" <rockhounds at lists.drizzle.com>
Sent: Friday, January 02, 2009 2:31 PM
Subject: Re: [Rockhounds] Another extinction impact-13 KYA


Iridium from volcano's is fairly rare, with only a very few known
examples. Iridium from comets and meteorites is fairly common.

Microdiamonds are related to almost every space based impact event.

I doubt you will find a volcano behind this event.

Kreigh


On Friday, Jan 2, 2009, at 13:05 America/Detroit, Dora Smith wrote:

> Here's more detail posted to a global warming list
>
> If I understand correctly on a fast glance, they did find iridium, one  of 
> the minerals I was referring to, which strengthens the case.
>
> I'd look for an earthbound volcano first, however.
>
> http://www.sciam.com/article.cfm?id=did-a-comet-hit-earth-12900-years- ago
>
> Yours,
> Dora Smith
> Austin, TX
> tiggernut24 at yahoo.com
> ----- Original Message ----- From: "J Bryan Kramer" 
> <codeburner at gmail.com>
> To: "Rockhounds at drizzle.com: A mailing list for rock and gem  collectors" 
> <rockhounds at lists.drizzle.com>
> Sent: Friday, January 02, 2009 9:11 AM
> Subject: [Rockhounds] Another extinction impact-13 KYA
>
>
> <
> http://www.nytimes.com/2009/01/02/science/ 
> 02impact.html?_r=2&partner=rss&emc=rss&pagewanted=all
>>
>
> I never heard of hexagonal diamonds, isn't that graphite's crystal
> structure?
>
> BK
> -- 
>
> ""It often seems to me that the night is much more alive and richly 
> colored
> than the day."
>
>                      Vincent van Gogh
> J Bryan Krämer
> North Florida, USA
> photos at:
> http://pbase.com/photoburner
>
>
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