[meteorite-list] Microcrater Swarms on Canyon Diablo

[Mr EMan]

Without researching to much on my own part, I would mention weathered out graphite and/or troilite nodules/veins.  The holes are too deep to be crater pits, IMO

Elton


--- On Thu, 2/19/09, Dark Matter <freequarks at gmail.com> wrote:


> From: Dark Matter <freequarks at gmail.com>

> Subject: [meteorite-list] Microcrater Swarms on Canyon Diablo

> To: "Meteorite List" <meteorite-list at meteoritecentral.com>

> Date: Thursday, February 19, 2009, 4:42 PM

> Hi All,

> 

> Once again, I found myself wandering the Smithsonian

> meteorite display

> in Washington DC this past weekend. This time, however, I

> spent less

> time studying the sexy stones and irons, and instead

> concentrated on

> the more common ones that I usually overlook.

> 

> One in particular caught my attention.

> 

> On display is a 435kg individual of Canyon Diablo. At

> first, I started

> on a quest to answer the question about if CD contains

> thumbprints or

> not. As I was carefully studying the surface, I noticed

> what I can

> only describe as swarms of micro craters.

> 

> I tried to come up with alternate hypotheses such as

> mechanical

> disassembly like pounding on it with a hammer and chisel,

> but no go.

> They have the splashforms of craters just like those

> commonly found on

> Sikhote-Alin individuals. Here's a link to a .pdf

> article about the

> S-A impact craters:

> 

> http://www.lpi.usra.edu/meetings/LPSC98/pdf/1839.pdf

> 

> 

> Linked are some pics of what I'm talking about.

> 

> http://www.geocities.com/planetwhy/CD1.JPG

> 

> http://www.geocities.com/planetwhy/CD2.JPG

> 

> http://www.geocities.com/planetwhy/CD3.JPG

> 

> Any thoughts?

> 

> -Martin

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