Re: KRS - artificial weathering

From: Eric Stevens (eric.stevens_at_sum.co.nz)
Date: 09/20/04 

Date: Mon, 20 Sep 2004 21:22:59 +1200

On Mon, 20 Sep 2004 06:45:44 GMT, "zolota" <zolota3@REMOVEshaw.ca>
wrote:

>
>"Daryl Krupa" <icycalmca@yahoo.com> wrote in message
>news:c70365ef.0409191839.57b928de@posting.google.com...
>> "zolota" <zolota3@REMOVEshaw.ca> wrote in message
>> news:<YX92d.441656$gE.137762@pd7tw3no>...
>>
>> <snip>
>>
>>> As I said before, sulphuric acid cannot eat a calcite crystal.
>>> I also assume that you know that.
>> <snip>
>>
>> Yes; I was thinking about protecting the calcite from the
>> effects of the sulfuric acid sufficiently to avoid
>> the possibility of forming a gypsum layer,
>> and so avoid detection of application
>> of the sulfuric acid.
>
>True, but agogle on minnesota, groundwater, so4 gives over 2,300 hits and i
>quote one:
>Sulfate (SO4) occurs naturally in most of Minnesota's goundwater, with
>higher levels common in the western part of the state. At high levels,
>sulfate can give water a bitter or astringent taste and can have laxative
>effects. This brochure provides a basic discussion of sulfate in well water
>and discusses action you can take to minimize it effects.

Apparently the local soil is a limey till with pH of 7.5 [Wolters
2003].
>
>http://www.health.state.mn.us/divs/eh/wells/sulfate.html
>
>In other words, finding a calcite crystal with a gypsum surface is entirely
>logical in Kensington so could anyone say that it's presence is
>questionable? They could say that only if they have tested other local rocks
>that contain calcite and found gypsum to be absent. By the same reasoning i
>would expect the same depth or nature of sulphate in calcite on both the
>ancient back of the KRS and the inside of the letters.
>
>>
>>> A good page that covers several of the topics is available.
>>> Note the coment about oxidation of biotite mica.
>>>
>>> http://gpc.edu/~pgore/geology/geo101/weather.htm
>>
>> Yes, I agree, good background, and I've noted that page already.
>> There is also this one, which Hmmm, I wonder, might have
>> inspired Wolter to test slate tombstones instead of marble ones
>> (marble, at least, is similar in composition to the calcite
>> on / in the KRS):
>>
>> http://www.uwgb.edu/dutchs/EarthSC202Slides/soilslid.htm
>>
>>> Than you, thank you very much.
>>
>> http://homepages.compuserve.de/thkoern/elvis.gif
>>
>> Roll with them Stones . . .
>>
>> http://www.omelete.com.br/imagens/televisao/news/simpsons/rock.jpg
>>
>> http://figures.nohomers.net/Customs/Custom_Bart_as_Elvis.JPG
>>
>> Daryl Krupa
>> (still playing D.A., still on the case, awaiting deposition)
>
>Of gypsum?
>
>Z
>

Eric Stevens

Relevant Pages

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  • Re: KRS - artificial weathering
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