328 Washington — Chamockite Series of Igneous Rocks. 



Table II. 

 Analyses of Quartz diorites. 

 ABC 



Si0 2 63-85 63-77 64-35 



A1 2 3 14-87 16-30 15-46 



Fe 2 3 2-32 7-49 7*50 



FeO .-. _ 5-07 n.d. n.d. 



MgO 3-29 2-49 0-50 



CaO 4-48 6-33 3'58 



Na 2 3-72 3-68 3-28 



K 2 1-09 1-21 3-54 



H 2 0-11 none 



Ti0 2 0-83 1-68 



Zr0 2 ._ trace 



PA — ._.. 0-08 



CI none .... 



S -. 0-15 FeS 2 



Ci\0 3 none 



MnO 0-05 



BaO none 



SrO 0-04 



D 



E 



63-22 



59-50 



17-46 



18-71 



1-35 



2-32 



3-40 



3-96 



2-05 



3-49 



4-91 



5-10 



5-12 



3-82 



1-31 



1-18 



0-60 



0-60 



0-74 



1-68 



0-07 



0-44 



0-07 



99-95 101-27 



99-94 100-67 100-43 



A. Quartz-hypersthene diorite (II.4.3.4"). Yercaud, Skevaroy 

 Hills, Madras. (11-915.) H. S. Washington analyst. 



B. "Intermediate charnockite." Same locality. (11-915.) T. 

 L. Walker analyst. T. H. Holland, op. cit., p. 151. 



C. Banatite. Dypvik, near Farsund, Norway. C, F. Kolderup 

 analyst. Berg. Mus. Aarb., 1896, No. v, p. 123. 



D. Hypersthene-quartz diorite. (II.4.3.4.) Foulke Fjord, 

 Ellesmere Land. P. Schei analyst. C. Bugge, Rep. 2nd Fram 

 Exp., No. 22, p. 18, 1900. 



E. Hypersthene granite. ("II.4.3.4.) Mount Zan, Ivory Coast. 

 Pisani analyst. A. Lacroix. C. R., cl, p. 21, 1910. 



The rock therefore falls in tonalose, with the symbol 

 IL4.3.4/. The three analyses of rocks from the similar regions 

 of Norway, Ellesmere Land, and the Ivory Coast resemble the 

 India one in general features, though in each there are certain 

 divergences. They will be discussed later. 



Norite. {"Basic Charnockite".) 



Two specimens of this type are represented. One (9-660) is 

 from St. Thomas' Mount, where it forms the two ends of 

 Magazine Hill. The other (9-673) is from Pammal Hill, at 

 Pallavaram, 11 miles south of Madras. They are both fine- 

 grained, dark gray or almost black, showing an even mixture 



