Copper in rocks is likely to be more mobile under this type of condition, as opposed to alkaline
[DOC] [TLE] Igneous Rocks of Contintental Lithosphere [PAR] Feb 15, 2011 ... All rocks will likely contain mafic minerals such as biotite, hornblende, ... At low 
pressure under dry conditions, the alkali feldspars form a complete ... Tectonic 
classification is more appropriately called a chemical ... A-type granites are 
generally peralkaline in composition [molecular (Na2O + K2O) > Al2O3].