[meteorite-list] Meteorites delivered Earth's gold

[Eric Wichman]

Quartz forms on Earth.



On 9/10/2011 2:36 PM, cdtucson at cox.net wrote:
> Paul, List,
> It seems to me that much of the Gold found on Earth is accompanied by Quartz.  In fact most of the finest Non-nugget specimens are usually found in quartz.
> That said; If this gold came from space then where did the quartz come from and for that matter why is gold not found buried in chonditic rock instead of quartz. . Quartz does not seem to be terribly abundant in meteorites.
> Just curious why we don't find gold / quartz meteorites. What changed meteorites? Do we have any witnessed falls of Gold meteorites?
> Do these researchers consider the Quartz issue here?
> Thanks.
> Carl
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> "Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote".
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> ---- "Paul H."<oxytropidoceras at cox.net>  wrote:
>> Young Earth was sprinkled with precious metals
> physicsworld.com, Sept. 7, 2011‎
> http://physicsworld.com/cws/article/news/47116
>
> Where does all the gold come from? University of
> Bristol, ‎Sept 7, 2011‎
> http://www.bristol.ac.uk/news/2011/7885.html
>
> Meteorites delivered Earth's gold, by Leila Battison
> BBC News, Sept 8, 2011‎
> http://www.bbc.co.uk/news/science-environment-14827624
>
> The paper is:
>
> Willbold, M., T. Elliott, and S. Moorbath, 2011, The
> tungsten isotopic composition of the Earth’s mantle
> before the terminal bombardment. Nature. vol. 477,
> no. 7363, pp. 195-198. DOI: 10.1038/nature10399
> http://www.nature.com/nature/journal/v477/n7363/full/nature10399.html
>
> A related paper is:
>
> Marty, B., and A. Meibom, 2007, Noble gas signature
> of the Late Heavy  Bombardment in the Earth’s
> atmosphere. eEarth. vol. 2, pp. 43–49.
>
> PDF file at:
> http://hal.archives-ouvertes.fr/docs/00/33/07/83/PDF/ee-2-43-2007.pdf
>
> Yours,
>
> Paul H.
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