GRANITE KOCKS OF BUTTE, MONT., AND VICINITY 739 
In the following table the results are given of the analyses so 
far made of the rocks of the Boulder batholith: 
ANALYSES OF ROCKS FROM THE POST-CRETACEOUS GRANITIC BATHO- 
LITH OF THE BOULDER MOUNTAINS, MONTANA 
Butte granite Aplites 
a 526 525 130 311 623 6 989 98 518 640 g5I 
SiO,......... ./49.22/56. 41/61 .64)63 .87/63.88) 64.05/64.34| 64.17/67.12/76.87| 77.05 
PLO) recta toiars casi OFO5|| 10-08!) B57 TE) 265) 265 60] .53 G7) AS) 2, Tor Hh2 
AU Ola creas See L2 0207. O21 5 OZ/lh. 20 Dh 104) 15.39/15 72 15.2505 O02 a5 2)" 12.074 
Hes Oned a 277 le24l 330 na03 2. )1l| 2.2011 502i) 62.70) 1 .62'| G67, .56 
Ne Ol ret wecsress 8.80] 3.55] 2.69] 3.08] 2.59] 2.74] 2.94] 2.98] 2.23] none .14 
INO teers crete tr FOS|p a sOAy kealris, 207 SEU le 104|| OG) wow. a mone 
(CF OR eae ee 10.56) 8.66) 4.90] 4.30] 3.97] 4-30] 4.24] 4.24] 3.43] 0.49 157 
IMS Oe a neice OP2O|eae O72 O2e2 222) 2203) e208 217s 2 001i 47.4 NO.09 tr 
Ke OMe eremccnou tte. Le fOP2 OU .72|0 4618) A423 qOol 4.04 a. 34\ea 5215.70) 552 
INNO’ Saause ode EROO|| Be25|\ 2 04) 276)! 2S" 2.7222, 76) 2.62162.70|) 2.4176 2 or 
Hi,O below 110°; 0.27| .14) .28| .19]. .22 P27 25 ALOE OO sOR25 222 
Hi Orabove 1107) 1563) 276]-..91) .69] -..66 HOR iy ea7i0 -65} .58) 0.52 .48 
BAG) etencueas weed S 203| 09) {os {o7| 200 08} .06 207) es O7]|) eet | none 
SOY nese onso cll To@ehe lols) acyl) exeyiy) sAroy) .04] .03 tr FO2 |e enone 
BS Ole recites. care sf: On43|— 240 s2T oz) ear SPAT) meatal 216|2 205] 205) none 
Nejeee cnet waiaye 4814 08), "07 : eel ere tr ir 
SO eeicro 6 ate es SOG Zorvelllseersncas 07 .07 03 Bel toes © none 
SO sealers: POA ee emonelie see Hi eee ays MOA 10 iets ee 
COR ee Sita. ava oe |LOG) ais LS ASR 235 103]| NONE), Mone!) 2 a) none 
diotalsen. 99.77/99 .70,99.70|/99.91\99.72|100.05|99.80|100.18|99.88)99.82|100. 31 
H. N. Stokes, Analyst. 
526, 525. Contact facies of granite mass, Red Mountains. 
130. Diorite, Red Rock Creek, intrusive in batholith. 
311, 623, 6, 989. Butte type of granite, Butte district. 
98. Head of Clancey Creek, northern part of batholith. 
518. Prevailing type of granite of batholith, Boulder. 
640,951. Aplites of Butte granite, Butte. 
The foilowing table shows the chemical composition of this 
rock, only the essential elements being given, the complete analy- 
sis being shown in the preceding table. Partial analyses of quartz- 
monzonite from the Sierra Nevada‘t and of Brégger’s adamellite? 
are given for comparison. 
*H. W. TURNER: The granitic rocks of the Sierra Nevada, Jour. GEOL., May 
1899, p- 141. 
? Die eruptionsfolge der triadischer Eruptivgesteine bei Predazzo, p. 62. 
