Smartville Block: Difference between revisions
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''Assembling California'', by John McPhee, published 1993 by Farrar, Straus and Giroux, New York. |
''Assembling California'', by John McPhee, published 1993 by Farrar, Straus and Giroux, New York. |
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[[Category:Sierra Nevada]] |
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Revision as of 04:10, 21 December 2006
The Smartville Block, also called the Smartville Complex or Smartville Intrusive Complex, is a geologic zone in the foothills of the Sierra Nevada mountains in California. Its eastern margin generally defines the gold-bearing veins of the Mother Lode important in California's history. It is named for the small town of Smartville in the Gold Country.
The Smartville Block is thought to be a geologic terrane, a piece of crust, probably an island arc, which accreted to the North American continent in the Jurassic Period, about 165 million years ago. The collision created sufficient crustal heating to drive mineral-laden water up through numerous fissures along the contact zone. When these cooled, among the precipitating minerals was gold.
Reference
Assembling California, by John McPhee, published 1993 by Farrar, Straus and Giroux, New York.