407 
IGNEOUS ROCKS OF THE SIERRA NEVADA. 
ANALYSES OF TERTIARY IGNEOUS ROCKS. 
HBL.- 
a0 HB. - Qrz- 
RuHYOLITE, OxpER Basatt. eS ee AgaES: Late PyroxENE-ANDESITES. Rae Tare Dee eRIe 
SPECIMEN BASALT. anes, ITE. ITE. 
NUMBER. a 
6 6 6 8 6 6 6 a) 66 626 
7 eae eet pliers: SWNT ISIN. | SAN. || SNe) SUN mee SN. | S.N. | S.N. | Plumas.| Plumas. 
SiO, - - 73.23 | 71.39 | 50.56 | 50.66 | 56.19 | 58.47 | 60.20 | 59.34 68.12 | 66.94 | 56.90 | 60.02 | 53.91 52.81 
TiO, - : - .09 7) of i 2.30 .69 51 5537) 32 25 .30 é 42 52 84 
Al,O, - - T27Be Pgeise |) TAL yale lets O7m |e 1O+7O4| 18.804) 17.20.) 17.00 16.24 | 16.49 sa) | MOM || I7/40)5) 16.60 
Cr.O, - - - or wa = a ae Ss zi .. | Done ae trace ve ag 
Fe,O, - - 99 63 3.54 2.55 3.05 3.34 3.12 3.63 1.26 1.41 : 2.17 Di 2.06 
FeO - - - .16 Bal 8.90 | 10.20 4.18 2.64 2.69 2.28 2.08 1.87 Se 3.40 4.80 6.13 
MnO - - trace | trace 52 .29 .10 13 .12 ale .10 13 : .10 .Io | undet. 
NiO - - - re : Pe | trace j a as : ws aa .. | none ae ne 
CaO - a= 61 1.01 7.58 8.08 6.53 6.60 6.04 6.45 3.80 4.77 7.83 7.01 | 10.40 10.14 
SrO- - - - none | trace | trace? | trace pee .05 | trace .04 .02 105 ; trace | trace trace 
BaO - - .02 .09 25 22 .19 .09 Il gill .09 .07 ais .08 105 .03 
MgO - - - 22, .08 4.07 4.45 3.79 2.09 3.18 3.50 1.35 1.98 shee 4.57 5.52 6.12 
K,O - - 5.17 5.69 2.10 1.95 4.46 2.01 1.44 1.94 2.54 1.05 1.37 1.59 1.34 1.05 
Na,O - - - 1.91 2.89 2.94 3.32 2.53 3.58 3.35 3.40 3.89 3.88 3.24 3.55 2.90 2.79 
Li,O - - trace | trace | trace? | none | trace | trace | trace | trace | trace | trace none | trace trace 
H.O below 110° C. 53 .42 1.06 52g] 34 14 1.12 .64 oe 35 a .24 .20 38 
H,O above 110° C.| 4.51 3.32 1.12 43 .66 .92 1.18 74 .40 .22 é 645 .20 54 
P5Oe = - - .02 .03 1.14 1.01 55 22, 5ll7/ 25 14 a2 : oft] 23 23 
Onn Bee es 3 Chien | ks I ees... SO a 
100.19 | 100.22 | 99.81 | 99.81 | 100.02 | 100.19 | 100.50 | 100.37 | 100.28 | 100.23 .. | 99.96 | 100.31 | 100.32 
