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172
THE JOURNAL OF GEOLOGY.

TABLE II.

Chemical Analyses of Volcanic Rocks of the Andes.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
SiO2 52.02
.867 		56.50
.941 		57.10
.951 		58.00
.966 		58.35
.972 		59.28
.988 		60.32
1.005 		62.35
1.039 		63.00
1.050 		63.19
1.050 		63.49
1.058 		63.69
1.061 		66.06
1.101 		72.46
1.207 		73.61
1.227
TiO2 tr .18
Al2O3 17.14
.168 		15.06
.147 		17.25
.169 		18.00
.176 		16.74
.164 		18.14
.177 		16.92
.165 		17.32
.169 		18.40
.180 		18.65
.183 		12.42
.121 		15.03
.147 		15.64
.153 		12.80
.125 		12.01
.117
Fe2O3 7.94
.049 		13.52 10.75 3.72
.023 		5.88
.036 		4.51
.028 		3.96
.024 		4.01
.025 		6.41
.040 		2.51
.015 		2.32
.014 		2.27
.014
FeO 3.52
.048 		2.73
.037 		6.71
.093 		8.79
.122 		1.40
.019 		1.89
.026 		1.34
.018 		2.41
.033 		3.90
.054
MnO .85 .54 tr .04 .10 .13 .85 .55 .71
MgO 3.13
.078 		2.72
.068 		2.50
.062 		3.56
.089 		4.84
.121 		3.43
.086 		3.52
.088 		3.60
.090 		3.71
.093 		1.20
.030 		1.32
.033 		.80
.020 		2.57
.064 		tr .20
.005
CaO 11.57
.206 		6.23
.111 		5.00
.089 		6.96
.122 		6.81
.121 		4.49
.080 		5.64
.100 		5.43
.097 		5.36
.095 		4.86
.086 		4.17
.074 		3.30
.059 		4.53
.080 		1.35
.024 		.89
.015
Na2O 2.38
.038 		4.55
.073 		5.12
.082 		4.36
.070 		4.69
.075 		4.26
.068 		3.83
.061 		4.29
.069 		4.22
.068 		3.69
.059 		4.90
.079 		6.54
.105 		4.00
.064 		4.48
.072 		4.34
.070
K2O .60
.006 		1.35
.014 		2.10
.022 		2.12
.022 		1.18
.012 		1.85
.019 		2.42
.025 		3.13
.033 		2.36
.025 		1.95
.020 		1.78
.019 		2.46
.026 		2.36
.025 		4.11
.043 		3.82
.040
P2O5 tr .15 tr tr
H2O .28 .30 .25 .32 .31 .44 .13 .36 .07 2.88 2.23 .30 2.92 3.35
99.45 100.23 100.07 99.77 100.17 100.24 100.37 100.80 101.47 100.07 99.56 99.52 100.09 100.44 100.53
  1. Portañuela, Volcano Yate, Southern Chili.
  2. Tunguragua, Ecuador.
  3. Chimborazo, Ecuador"
  4. Chimborazo, Ecuador"
  5. Tunguragua, Ecuador"
  6. Carahuirazo, Ecuador"
  7. Chimborazo, Ecuador"
  8. Pichincha, Ecuador"
  9. Cachutafruto, Ecuador.
  10. Tajumbina, Colombia.
  11. Volcano Yate, Southern Chili.
  12. Volcano Yate, Southern Chili"
  13. Tunguragua, Ecuador.
  14. Guamani, Tablon de Itulgache, Ecuador.
  15. Oyacachi.
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