Richard Harwood's Thesis

Cinder Cone Breaching Events at

Strawberry and O'Neill Craters

TABLES

Table 1.

Scoria vents in the San Francisco volcanic field (Ulrich, unpublished data).

Basalt
    539
Basaltic Andesite      
15
Benmoreite
14
Total
568

Table 2.

Classification of volcanic rocks in the San Francisco volcanic field. The Colton (1936) and Cooley (1962) classification schemes are based on geomorphic relationships. The Moore and other (1974) classification is based on K-Ar dates.

Time Scale Colton (1936) Cooley (1962) Moore et al. (1974)
0-1000 yr Stage V V Sunset Crater Sunset Crater Age
1,000 - 100,000 yr Stage IV IV Grand Falls Merriam Crater Age
100,000 - 500,000 yr Stage III III Deadman Wash Tappan Age
500,000 - 1,000,000 yr Stage II II Tappan Spring
IA Woodhouse Woodhouse Mesa Age
>1,000,000 yr Stage I IB Black Point
Older Basalt Older Basalts Cedar Ranch Age

Table 3.

Complete oxide analysis for Strawberry and O'Neill Craters. Data is from Moore and Wolfe (1987), samples 2929 to 4929; and Bloomfield (1988, written comm.), samples 72206A to 80403.

  2929 2929B 2929D 2929E 2929G 2933A 4920 4920A 4920B 4920C 4929
SiO2
46.96
54.40
54.30
67.30
52.20
58.40
58.91
62.82
74.68
49.19
59.30
Al2O3
14.66
15.20
15.10
15.30
15.00
15.50
15.81
15.42
13.53
14.39
16.60
Fe2O3
2.20
2.60
2.40
0.80
2.30
1.30
1.73
0.92
1.24
4.51
1.80
FeO
7.61
5.24
5.15
2.66
6.03
5.13
4.69
3.69
0.91
5.56
4.90
MgO
9.25
6.50
6.00
1.20
7.40
4.30
4.04
2.54
0.67
8.69
3.90
CaO
12.61
9.10
8.70
2.60
10.10
6.70
6.26
4.28
4.35
11.37
6.40
Na2O
2.84
3.40
3.90
4.90
3.30
4.10
3.90
4.27
4.22
2.95
3.80
K2O
0.74
1.80
2.00
3.70
1.60
2.60
2.64
3.27
0.22
0.91
2.30
H2O
0.22
0.20
0.55
0.98
0.44
0.66
0.34
1.20
0.23
0.25
0.69
TiO2
1.37
1.14
1.11
0.45
1.26
0.96
0.91
0.62
0.19
1.25
0.98
P2O5
0.78
0.59
0.59
0.23
0.69
0.51
0.43
0.27
0.04
0.60
0.21
MnO
0.18
0.17
0.17
0.10
0.19
0.14
0.12
0.10
0.03
0.17
0.10
CO2
0.06
0.05
0.05
0.05
0.05
0.06
0.02
0.04
0.04
0.05
0.04
Total
99.48
100.39
100.02
100.27
100.56
100.36
99.80
99.44
100.35
99.89
101.02

  72206A 72206C 80302A 80302C 80302E 80302G 80303 80304 80401 80402 80403
SiO2
57.11
55.80
55.63
49.05
49.83
49.15
63.98
59.69
54.12
59.49
59.35
Al2O3
15.42
15.43
15.27
14.80
15.21
15.41
15.40
15.17
15.09
15.34
15.56
Fe2O3
7.68
8.15
8.17
10.14
10.33
10.72
5.33
6.89
8.88
6.85
7.07
FeO
 
 
 
 
 
 
 
 
 
 
 
MgO
4.72
5.34
5.40
7.92
7.57
8.14
2.69
4.44
6.63
4.02
4.04
CaO
6.85
7.51
7.73
12.65
11.99
10.27
4.24
6.10
8.14
6.25
5.98
Na2O
3.83
3.74
3.70
2.60
2.89
2.90
4.33
4.07
3.41
4.01
3.98
K2O
2.30
2.08
2.08
0.88
1.05
0.95
3.37
2.69
1.77
2.65
2.56
H2O
 
 
 
 
 
 
 
 
 
 
 
TiO2
0.96
1.03
1.04
1.29
1.36
1.33
0.64
0.83
1.11
0.87
0.92
P2O5
0.43
0.47
0.47
0.64
0.64
0.64
0.27
0.40
0.50
0.40
0.41
MnO
0.14
0.14
0.14
0.17
0.17
0.17
0.11
0.12
0.15
0.12
0.13
CO2
 
 
 
 
 
 
 
 
 
 
 
Total
99.44
99.69
99.63
100.14
101.04
99.68
100.36
100.40
99.80
100.00
100.00

Table 4.

Breach azimuths and statistical calculations for cinder cones in the San Francisco volcanic field. The data for the volcanic field has been divided into two subsets. Each subset represents azimuths for cinder cones whose breach direction is either east or west. The location name is based on the USGS MF-1956 through MF-1960 series maps.

Data set #1 - Cones breached to the east.

vent degree radian cos sin location type
V3034 36 0.628 0.809 0.588 East Bas. Andesite
V2919 80 1.396 0.174 0.985 East Basalt
V4920 90 1.571 0.000 1.000 East Bas. Andesite
V3507 95 1.658 -0.087 0.996 Central Basalt
V5923 98 1.710 -0.139 0.990 East Basalt
V2929 105 1.833 -0.259 0.966 East Bas. Andesite
V1602 106 1.859 -0.276 0.961 Central Benmoreite
V5831 107 1.868 -0.292 0.956 Central Basalt
V2A01 110 1.920 -0.342 0.940 East Basalt
V5914 114 1.990 -0.407 0.914 East Basalt
V2014 114 1.990 -0.407 0.914 East Basalt
V3821A 120 2.094 -0.500 0.866 East Basalt
V5725 139 2.426 -0.755 0.656 S P Basalt
V4301 140 <2.443 -0.766 0.643 Southwest Bas. Andesite
V1615 146 2.548 -0.829 0.559 Central Basalt
V5411 158 2.758 -0.927 0.375 Northwest Basalt
V3932 160 2.793 -0.940 0.342 East Basalt
V3307 170 2.967 -0.985 0.174 Southwest Basalt
V1316A 170 2.967 -0.985 0.174 Southwest Basalt
V4225 177 3.089 -0.999 0.052 Southwest Bas. Andesite
n=20   SUM -8.911 14.050    

Mean = 122.355°
C = -0.446
S = 0.702
R = 0.832

95% confidence interval 106.825° =< theta =< 137.88°

Data set #2 - Cones breached to the west.

vent degree radian cos sin location type
V1009 217 3.787 -0.799 -0.602 East Basalt
V3335 230 4.014 -0.643 -0.766 Southwest Basalt
V6409 250 4.363 -0.342 -0.940 Northwest Basalt
V3523A 260 4.538 -0.174 -0.985 Central Basalt
V4327 274 4.782 0.070 -0.998 Southwest Basalt
V3824 281 4.904 0.191 -0.982 East Basalt
V3310 282 4.922 0.208 -0.978 Southwest Basalt
V3522 290 5.061 0.342 -0.940 Central Benmoreite
V2008 303 5.288 0.545 -0.839 East Basalt
V4626 307 5.358 0.602 -0.799 Central Basalt
V5704 314 5.480 0.695 -0.719 S P Basalt
V3619 322 5.620 0.788 -0.616 Central Basalt
V2308 322 5.620 0.788 -0.616 Southwest Basalt
V1303 324 5.655 0.809 -0.588 Southwest Basalt
V3426 326 5.690 0.829 -0.559 Central Basalt
V4931 354 6.178 0.995 -0.105 East Basalt
n=16   SUM 4.903 -12.029    

Mean 292.142°
C = 0.306
S = -0.752
R = 0.812

95% confidence interval 274.153° =< theta =< 310.131°

Table 5.

Breach azimuths and statistical calculations for cinder cones located east of longitude 111° 45' in the San Francisco volcanic field. Location name is based on the USGS MF-1956 through MF-1960 series maps.

vent degree radian cos sin location type
V3034 36 0.628 0.809 0.588 East Bas. Andesite
V2919 80 1.396 0.174 0.985 East Basalt
V4920 90 1.571 0.000 1.000 East Bas. Andesite
V5923 98 1.710 -0.139 0.990 East Basalt
V2929 105 1.833 -0.259 0.966 East Bas. Andesite
V1602 106 1.859 -0.276 0.961 Central Benmoreite
V5831 107 1.868 -0.292 0.956 Central Basalt
V2A01 110 1.920 -0.342 0.940 East Basalt
V5914 114 1.990 -0.407 0.914 East Basalt
V2014 114 1.990 -0.407 0.914 East Basalt
V3821A 120 2.094 -0.500 0.866 East Basalt
V5725 139 2.426 -0.755 0.656 S P Basalt
V1615 146 2.548 -0.829 0.559 Central Basalt
V3932 160 2.793 -0.940 0.342 East Basalt
V1009 217 3.787 -0.799 -0.602 East Basalt
V3824 281 4.904 0.191 -0.982 East Basalt
V2008 303 5.288 0.545 -0.839 East Basalt
V4626 307 5.358 0.602 -0.799 Central Basalt
V5704 314 5.480 0.695 -0.719 S P Basalt
V4931 354 6.178 0.995 -0.105 East Basalt
n=20   SUM -1.934 7.592    

Mean 104.257°
C = -0.097
S = 0.380
R = 0.392

95% confidence interval 60.691° =< theta =< 147.823°

Table 6.

Breach azimuths and statistical calculations for cinder cones located west of longitude 111° 45' in the San Francisco volcanic field. Location name is based on the USGS MF-1956 through MF-1960 series maps.

vent degree radian cos sin location type
V3507 95 1.658 -0.087 0.996 Central Basalt
V4301 140 2.443 -0.766 0.643 Southwest Bas. Andesite
V5411 158 2.758 -0.927 0.375 Northwest Basalt
V3307 170 2.967 -0.985 0.174 Southwest Basalt
V1316A 170 2.967 -0.985 0.174 Southwest Basalt
V4225 177 3.089 -0.999 0.052 Southwest Bas. Andesite
V3335 230 4.014 -0.643 -0.766 Southwest Basalt
V6409 250 4.363 -0.342 -0.940 Northwest Basalt
V3523A 260 4.538 -0.174 -0.985 Central Basalt
V4327 274 4.782 0.070 -0.998 Southwest Basalt
V3310 282 4.922 0.208 -0.978 Southwest Basalt
V3522 290 5.061 0.342 -0.940 Central Benmoreite
V3619 322 5.620 0.788 -0.616 Central Basalt
V2308 322 5.620 0.788 -0.616 Southwest Basalt
V1303 324 5.655 0.809 -0.588 Southwest Basalt
V3426 326 5.690 0.829 -0.559 Central Basalt
n=16   SUM -2.073 -5.571    

Mean 249.622°
C = -0.130
S = -0.348
R = 0.372

95% confidence interval 198.038° =< theta =< 301.206°