[Rockhounds] Another extinction impact-13 KYA

[J Bryan Kramer]

Iridium has been found associated with certain volcanic ashes. The Hawaiian
and the Antarctic volcanoes produce iridium enriched ashes as do others:

<http://bulletin.geoscienceworld.org/cgi/content/abstract/108/4/489>

Not that they are talking about ppt (part per trillion) enhancement of Ir
but the KT layer is enhanced to 5-10 ppb (parts per billion) and one ppb
equals 1000 ppt. The Antarctic enhancement are reported to be locally in the
ppb range tho.

But there are other markers in the KT event, diamond nanoparticles for one:

<http://geology.geoscienceworld.org/cgi/content/abstract/25/11/1019>

Cubic diamonds in this case.  The Columia flood basalt event does seem to be
going on around the same time as the KT event so you have to wonder about
that.

BK

On Sat, Jan 3, 2009 at 09:52, Dora Smith <tiggernut24 at yahoo.com> wrote:

> 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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-- 

""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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