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peraluminous |
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peraluminous [‚pər·ə′lü·mə·nəs]
(petrology) Of igneous rock, having a molecular proportion of aluminum oxide greater than that of sodium oxide and potassium oxide combined. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Within the peraluminous granitic rocks of southern Nova Scotia, uranium concentrations generally increase and thorium concentrations decrease with increasing magmatic differentiation, resulting in abnormally high eU/eTh associated with the most evolved parts of these granitic intrusions. The "younger" Devonian event is characterized by intrusion of peralkaline, metaluminous, and peraluminous granitoid stocks and batholiths. Most of the gold occurs in a breccia unit related to the Sortan fault that strikes northwest, dips northeast and juxtaposes Jurassic Winterhaven Formation against lower plate gneisses which have been extensively intruded by biotite alaskite phases of the Marcus Wash peraluminous granitic complex. |
peraluminous |
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