[meteorite-list] Meteorites delivered Earth's gold

From: cdtucson at cox.net <cdtucson_at_meteoritecentral.com>
Date: Sat, 10 Sep 2011 17:36:48 -0400
Message-ID: <20110910173648.3GG2O.1888168.imail_at_fed1rmwml36>

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

--
                                                             
"Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote". 
  
 
---- "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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Received on Sat 10 Sep 2011 05:36:48 PM PDT