INTEKMEDIATE CHARACTER OF APPALACHIAN GRANITES 



21 



The position of the North Carolina rocks in the quantitative scheme of 

 classification has been computed, and is shown in the tabular statement 

 below. 



Granites of North Carolina. 



From the position of these rocks in the quantitative classification as 

 tabulated above, it will be observed that I and II are in the peralkalic rang 

 and the sodipotassic subrang, and are termed alaskose. Ill, IV, V and VI 

 fall in the domalkalic rang and the dosodic subrang, but vary in their posi- 

 tion either as to class or order. Ill and V are 1. 4. 2. 4., lassenose; IV is 

 1. 3. 2. 4., alsbachose; and VI is II. 4. 2. 4., and is dacose. 



South Carolina. 



Mineral composition. — The South Carolina granites are biotite granites 

 with or without muscovite. Hornblende associated with biotite is only 

 known to the writer at one locality in the State. The essential and acces- 

 sory minerals are the same as for the Maryland, Virginia, and North 

 Carolina rock^. The same types, based on texture and structure, are 

 recognized as for the other states. 



Chemical composition. — The range in silica, lime, and the alkalies in 

 the South Carolina rocks is shown in table H. 



H. Taile of partial analyses of South Carolina granites.^ 



I. Clover, York county, South Carolina. Bull. No. 2, Series IV, S. C. Geol. 

 Survey, 1908, p. 254. 

 II. Moores Creek, Saluda county. South Carolina. Bull. No. 2, Series IV, S. C. 

 Geol. Survey, 1908, pp. 191-192. 



'Sloan, E. A Catalogue of the Mineral Localities of South Carolina. S. C. Geol. 

 Survey, Bull. No. 2, Series IV, 1908, pp. 174-229, 250-255. 



