[Rockhounds] West Michigan's geology could be answer to keepingcarbon emissions out of global-warming mix

[Kreigh Tomaszewski]

Axel,

The Urey Reaction has CO2 and siliceous rock, in the presence of water, 
converting to SiO2 and carbonates. Cements in the Mount Simon formation 
include quartz and feldspar overgrowths, hematite and kaolinite, 
carbonate, chlorite, and microquartz (chert). See 
http://aapgbull.geoscienceworld.org/cgi/content/abstract/68/6/753.

Since most of the cements are not affected, it should not be a problem. 
If it were, I suspect it would have shown up in the testing done so 
for. But it is a good question. Since I live over the formation I have 
left a message for the reporter to see if the question came up in his 
research for the article.

Kreigh



On Tuesday, Oct 7, 2008, at 05:44 America/Detroit, Axel Emmermann wrote:

> Kreigh,
>
> Mucho interesting idea!
> One thought crossed my mind when I found this about sandstone: " 
> Sandstone,
> the sedimentary rock is composed of small grains that are cemented by
> siliceous, felspathic or calcareous cementing material. The cementing
> material determines the durability of the sandstone.
>
> I keep forgetting the name of the reaction but there is a known effect 
> in
> which siliceous rock is weathered by CO2 and water into carbonates and 
> sand.
> It's the "?????-reaction". I keep forgetting the name but there's a 
> "u" in
> it ;-)))
> AAAAAHHHHHHUUUGGGGGHHHHHHRRRRRRRRRRRRRR (sound of me having a 
> brainstorm)
> Got it: the UREY-reaction. Named after Harold Urey.
> CO2 under high pressure could attack feldspars and other silicates. 
> Take
> away the cementing mineral from the sandstone and it could collapse. 
> That
> would have a fatal effect on the porosity of the layer in the immediate
> vicinity of the injection point.
>
> Normally the Urey reaction is a slow geological process. In this case
> however pressure and temperature may be important in speeding the 
> reaction.
>
> Axel
>
>
>
>> -----Oorspronkelijk bericht-----
>> Van: rockhounds-bounces at lists.drizzle.com
> [mailto:rockhounds-bounces at lists.drizzle.com]
>> Namens Kreigh Tomaszewski
>> Verzonden: zondag 5 oktober 2008 22:38
>> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem 
>> collectors
>> Onderwerp: [Rockhounds] West Michigan's geology could be answer to
> keepingcarbon
>> emissions out of global-warming mix
>>
>> It is not often that the main story on the front page of my local
>> newspaper is about geology.
>>
>> http://www.mlive.com/grpress/news/index.ssf/2008/10/
>> graphic_for_emissions_story.html
>>
>>
>> --
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