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Re: Moonquakes

Subject: Re: Moonquakes
From: "John Curtis"
Date: 16 Mar 2006 09:34:43 -0800
Newsgroups: sci.astro, alt.sci.planetary, sci.geo.earthquakes
Aidan Karley wrote:
>
>        By doing analyses of the rocks returned by the Apollo missions. The
> rocks returned are *very* dry. Extrememly dry. In comparisons, most
> earth-formed rocks contain a percent or so of water, as both patent water
> (which can be evaporated from the powder by drying at around 120deg C) and
> as chemically-bound water within silicates. For example, most amphibole
> minerals will contain the equivalent of around one percent of water as
> hydroxyl entities, which can be freed from the rest of the components by
> fusion under (earth) atmospheric pressure (may take a while). Moon rocks, by
> contrast, don't contain the free water, and are made from minerals that
> don't contain much of the components of water. The lack of water components
> *within* mineral grains *within* rocks indicates that the Moon was very dry
> at the time that the mineral were formed, typically 4½ gigayears ago.
>
Fresh olivine is formed at deep ocean volcanos and at dying stars,
where water is the dominant compound.
http://www.edpsciences.org/articles/aa/pdf/2001/34/aade292.pdf?access=ok
Since lunar olivine is not presolar, in situ formation is an
alternative.
Silicates relinquish water while still in acid form, H4SiO4,
but once converted into salts, such as olivine (Fe or Mg)2SiO4
or Zircon,  ZrSiO4,  they become impervious to desiccation
by heat or vacuum. John Curtis


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