Lecture 23 Mar 24 2008 More plate tectonics and ore deposits

Lecture 23 Mar 24 2008 More plate tectonics and ore...

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There are three types of tectonic settings in which copper deposits are known to form. All three deposits, however, are hydrothermal.
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Associated with intermediate to felsic magmatic intrusions in continental settings, porphyry copper forms as disseminated, low-grade ore in the country rock overlying the magma chamber. We exploit ore containing as little as 0.2% copper. See lecture on 2-9-2008
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The tectonic setting for porphyry copper deposits is now well understood. The most extensive deposits are where Pacific ocean plate is subducted under American continental plates.
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A subducting ocean plate at a continental margin creates a deep-sea trench, a volcanic belt at the continental margin, and shallow- and deep-focus earthquakes.
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A Kuroko-type massive sulfide deposit is typically smaller than a porphyry copper deposit, but it is a higher grade of ore. (Grade is the percent of desired element in the bulk ore.) This environment of formation is an island arc system developing on a convergent boundary where ocean floor is subducting
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This note was uploaded on 04/11/2008 for the course EVSC 280 taught by Professor Herman during the Spring '08 term at UVA.

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Lecture 23 Mar 24 2008 More plate tectonics and ore...

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