PETROLOGY OF SOUTH CAROLINA GRANITES 735 
reasonably uniform, and is neither very high nor very low. Most of 
the lime in these analyses is to be attributed to the prevailingly large 
amount of soda-lime feldspar present in the rocks. 
CHEMICAL ANALYSES OF SOUTH CAROLINA GRANITES AND 
GNEISSES* 
I I Til IV V VI Vil VIII 
S1@galasveys ete jolene 68.70 | 68.80 | 68.90 | 69.79 | 70.54 | 70.70 | 69.95 | 68.94 
JENIK Opec ote Oe LOSAOM ec sp7 se) L575 a TO.OSm) TaesOn| ts (Osele mia TOE Thno7 
Ne-Oseaomeee ues I. TO Bera | tO I.o1f| 1.06 TTAt|| r.20- | “2.80 
Te Oenstots eo ath oushs Be ele S7 DAO | er OOF) er: O2 iar. 24ti| Met Ona in 220! 
IMs Oe Gee eerai OMGOMME VLeTOl Wh On 74y O53. |) On Srp Orson NOOO umisOx! 
CaO mri eee I.70 1.64 2.66 T5733 r.28 QnTAT | D04 2.24 
INGA O aoe mine BOO |e S54 Sulleard7On|= 407 "3h 07 la 3 COnl. suOralEs. 40 
K,0........... BROOM ean SAe lise ON eae 4S elms Seioy= lett On lm gieG Zale mest 
MioTane sys otis) oss 0.81 0.33 0.18 0.49] 0.27 0.48 | 0.39 0.29 
BIBI @ a eee: a os O02 O4))|) OO. 4509: 0230)" O.4 1h) 0.00: 0.2455, 10.43 0.50 
IM al O)e Ss eeseere ieee sirace ei Trace race. |; itrace, |) race traces; ,oon.|) derace 
Ee Or ia. | race! | race’ | (race | “Trace | ‘race |-“lrace: |) dirace: | “Brace 
SOR eee) cOntsa| “brace q|siirace di irace 0.06 | Trace | Trace 0.02 
99-51 | 99.81 | 99.49 |100.67 |I00.1I |100.49 | 99.88 | 99.92 
* Earle Sloan, South Carolina Geological Survey, 1908, Series IV, Bull. No. 2, pp. 174-225. 
+ Average of 2 analyses. 
ft One analysis. 
I. Porphyritic biotite granite, Clouds Creek, 4.7 miles north of Batesburg, 
Saluda County. 
II. Biotite granite, Cold Point Station, Laurens County. 
III. Biotite granite, Jackson’s Quarry, o.5 mile north of Clover, York County. 
IV. Average of 3 analyses, including biotite granite from Anderson Quarry, 
Fairfield County, biotite granite from Excelsior Quarry, Lancaster County, and 
biotite granite from Leitzsey Quarry, Newberry County. 
V. Biotite granite, Benjamin Quarry, 4 miles east of Greenwood, Greenwood 
County. 
VI. Average of 2 analyses, including biotite granite from Flatrock Quarry, Union 
County, and Keystone Granite Co.’s Quarry, Spartanburg County. 
VII. Average of 13 analyses of biotite granites. 
VIII. Average of 4 analyses of granite-gneisses, including Ware Shoals, Laurens 
and Abbeville counties, Beverly Quarry, Pickens County, Pendleton Quarry, Ander- 
son County, and Bates Quarry, Lexington County. 
The sum of the alkalies ranges from 6.45 to 9.34 per cent., with 
an average of 8.48 per cent. for 13 analyses of the South Carolina 
granites. In the relation between K,O and Na,O the former slightly 
predominates, ranging from 3.36 per cent. to 5.37 per cent. Na,O 
