[Rockhounds] Source of heavy elements in crust?

[Alan Goldstein]

It would be a safe bet to say the geology of Earth is a reflection of the 
composition of the formation of the Solar System. Whether precious metals 
were accumulated during the initial collision of planetesimals or the rain 
of meteorites during the first billion years of the Earth's history doesn't 
rate among the more pressing issues of geology for me. Have any precious 
metals been found in any meteorite? They are "precious" because of their 
scarcity. Since meteorites are relatively scarce as well, one would expect 
"scarce squared" would indicate that you are not likely to find gold, 
silver, etc. in meteorites.

On a related matter, geologists say that earth's oceans are from comets 
colliding with our planet.

Alan


----- Original Message ----- 
From: "J Bryan Kramer" <codeburner at gmail.com>
To: "Rockhounds at drizzle.com: A mailing list for rock and gem collectors" 
<rockhounds at lists.drizzle.com>
Sent: Monday, September 22, 2008 10:36 AM
Subject: [Rockhounds] Source of heavy elements in crust?


This fellow thinks the crust was seeded with  heavy elements from meteor
strikes 4 GYa

<
http://www.universetoday.com/2008/09/22/earths-precious-metals-could-be-from-meteorites-and-asteroids/
>

BK