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Carbonates on planet Venus

 
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andre
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Joined: 02 Jan 2005
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PostPosted: 25 Jan 2005 23:04    Post subject: Carbonates on planet Venus Reply with quote

I'm not a carbonate specialist at all, just a generalist trying to find answers. I believe that planet Venus and Earth may have much more in common than it obviously seems to be.

There is a notion that the amount of carbon (dioxide) in the atmosphere of Venus is the same order of magnetude as all the carbon in the Earth lithosphere. If the general composition of Earth and Venus are comparable, it begs the question if there are any carbonates in the soil of Venus.

Anybody has ideas about this?
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NileQueen
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Joined: 31 Dec 2004
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PostPosted: 08 Feb 2005 04:42    Post subject: Reply with quote

Soil would imply organic matter and what would be left after that meltdown? Maybe you mean lithosphere or crust.

So if a carbonate was organic or inorganic, if you burned it, would the resulting CO2 have an isotopic signature?

On earth is there an isotopic difference between inorganic and organic carbonate?

Thanks
NQ
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Bjarne Rafaelsen
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PostPosted: 19 Oct 2005 13:51    Post subject: Carbonates Venus Reply with quote

The surface temperature of Venus is sufficiently high that I do not think any soil as we know it would exist. Also, the temperature might be too high for preservation of carbonate rock. Be that as it may, the presence of soil in no way implies the presence of organic matter. Soil is weathered rock and on earth usually contains organic matter. That is just because there's so much organic matter on the Earth. Organic and inorganic carbonates do indeed differ isotopically. The relationship is not simple, but basically organic carbon is much lighter than inorganic carbon. This is because several of the processes by which organisms build molecules containing carbon involve a bias towards the lighter carbon atoms. Some inorganic carbonate building processes involve the opposite bias.

Posted for David C. Kopaska-Merkel,
Geological Survey of Alabama
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Bjarne Rafaelsen
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PostPosted: 12 Feb 2008 15:35    Post subject: Carbonates on Mars? Reply with quote

If not on Venus, there are speculations of carbonates on Mars: http://science.nasa.gov/headlines/y2001/ast04feb_1.htm
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Dmitriy Volkov
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PostPosted: 14 Feb 2008 15:53    Post subject: Reply with quote

Of course, there is not sedimentary carbonates on the surface of Venus, due to its extreme temperature. But don't you think that there can appear mostly carbonate rocks of igneous origin, such as carbonatites?
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