RK 22 F
|
42 km SE of Durango, Dgo.
|
-104.50
|
23.87
|
Ignimbrite
|
K/Ar
|
Feld
|
31.40
|
0.70
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
RK 10 P
|
27 km S of Durango, Dgo.
|
-104.67
|
23.83
|
Ignimbrite
|
K/Ar
|
Pl
|
31.20
|
1.50
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
RK 17 F
|
Guadalupe Victoria dam, Dgo.
|
-104.75
|
23.96
|
Ignimbrite
|
K/Ar
|
Feld
|
31.20
|
0.70
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
*
|
Texcoco well, -1500
|
-99.00
|
19.40
|
Andesite
|
K/Ar
|
WR
|
31.10
|
|
Mooser et al. 1974
|
|
|
|
|
|
|
|
|
*
|
Cuenca Libres-Oriental
|
-97.48
|
19.37
|
Sienite
|
K/Ar
|
|
31.00
|
1.90
|
Negendank et al. 1985
|
|
|
|
|
|
|
|
|
|
|
|
|
Andesite
|
K/Ar
|
WR
|
31.00
|
3.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
|
|
|
|
Tonalite
|
K/Ar
|
Bio
|
31.00
|
3.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
|
|
|
|
Granite
|
K/Ar
|
Bio
|
31.00
|
2.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
RK 20 F
|
7.5 km NW of Durango, Dgo.
|
-104.74
|
24.07
|
Ignimbrite
|
K/Ar
|
Feld
|
31.00
|
0.70
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
|
|
|
|
Granodiorite
|
K/Ar
|
Bio
|
31.00
|
3.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
|
Stgo. Chazumba, Oax.
|
|
|
Ignimbrite
|
K/Ar
|
|
31.00
|
|
Moran-Zenteno et al. unpub.
|
|
|
|
|
|
|
|
|
|
San Andres Lagunas, Oax.
|
|
|
Ignimbrite
|
K/Ar
|
|
31.00
|
|
Moran-Zenteno et al. unpub.
|
|
|
|
|
|
|
|
|
AMC-05
|
La Sauceda, Gto.
|
-101.17
|
20.89
|
Rhyolite
|
K/Ar
|
San
|
30.80
|
0.80
|
Nieto-Samaniego et al., 1996
|
|
|
|
|
|
|
|
|
AMC-08
|
N of Guanajuato, Gto.
|
-101.27
|
21.45
|
Rhyolite
|
K/Ar
|
San
|
30.70
|
0.80
|
Nieto-Samaniego et al., 1996
|
|
|
|
|
|
|
|
|
JL-RD-A P
|
5 km NE of Durango, Dgo.
|
-104.65
|
24.63
|
Rhyolitic dike
|
K/Ar
|
Pl
|
30.70
|
0.70
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
RK 23 B
|
El Pino, Dgo.
|
-104.83
|
23.99
|
Rhyolite
|
K/Ar
|
Bio
|
30.70
|
0.50
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
TS 10
|
W of Huejuquilla, Jal.
|
|
|
Ignimbrite
|
Ar/Ar
|
San
|
28.70§
|
0.40
|
Ferrari et al., in preparation
|
|
|
|
|
|
|
|
|
*
|
N of Sta. Maria del Rio, SLP
|
-100.68
|
21.90
|
Rhyodacite
|
K/Ar
|
WR
|
30.60
|
1.50
|
Labarthe-Hernandez et al., 1982
|
|
|
|
|
|
|
|
|
2-71-1 F
|
Cerro de Mercado, Dgo.
|
-104.67
|
24.05
|
Ignimbrite
|
K/Ar
|
Feld
|
30.60
|
0.90
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
BV 17
|
Tilzapotla, Mor.
|
-99.24
|
18.49
|
Ignimbrite
|
K/Ar
|
Pl
|
30.50
|
1.10
|
Alba-Aldarve et al., 1996
|
|
|
|
|
|
|
|
|
*
|
Texcoco well, -1500
|
-99.00
|
19.40
|
Andesite
|
K/Ar
|
WR
|
30.40
|
0.00
|
Mooser et al. 1974
|
|
|
|
|
|
|
|
|
EN 162
|
SE Tula, Pach.
|
-99.24
|
19.98
|
Bas.-Andes. dike
|
K/Ar
|
WR
|
30.27
|
1.90
|
Jacobo-Albarrán, 1986
|
|
|
|
|
|
|
|
|
AMC-06
|
NE of Santa Rosa, Gto.
|
-101.02
|
21.08
|
Rhyolite
|
K/Ar
|
San
|
30.10
|
0.80
|
Nieto-Samaniego et al., 1996
|
|
|
|
|
|
|
|
|
*
|
Sierra de Carranco, SLP
|
-101.15
|
21.85
|
Rhyolite
|
K/Ar
|
WR
|
30.00
|
1.50
|
Labarthe-Hernandez et al., 1982
|
|
|
|
|
|
|
|
|
GTO 74
|
Cañada la Virgen, Gto.
|
|
|
Andesite
|
K/Ar
|
WR
|
30.00
|
0.70
|
Cerca-Martínez, 1998
|
|
|
|
|
|
|
|
|
RK 5 F
|
9 km S of Durango, Dgo.
|
-104.67
|
23.93
|
Ignimbrite
|
K/Ar
|
Feld
|
30.00
|
0.70
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
|
Yucudaac, Oax.
|
-97.55
|
17.68
|
Andesite
|
K/Ar
|
WR
|
30.00
|
|
Ferrusquia & McDowell, in press
|
|
|
|
|
|
|
|
|
RK 6 F
|
La Ferreria, Dgo.
|
-104.67
|
23.95
|
Ignimbrite
|
K/Ar
|
Feld
|
29.90
|
0.70
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
JL BM LB R
|
Mesa Caleras, Dgo.
|
-104.22
|
24.53
|
Basalt
|
K/Ar
|
WR
|
29.80
|
0.60
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
*
|
Santa Maria del Rio, SLP.
|
-100.70
|
21.80
|
Ignimbrite
|
K/Ar
|
WR
|
29.50
|
1.50
|
Labarthe-Hernandez et al., 1982
|
|
|
|
|
|
|
|
|
HP 10
|
N of San Ignacio, Sin.
|
-106.47
|
24.06
|
Andesitic dike
|
K/Ar
|
Hb
|
29.50
|
0.7
|
Henry & Fredrikson, 1987
|
|
|
|
|
|
|
|
|
JL BR SI R
|
Mesa Caleras, Dgo.
|
-104.57
|
24.08
|
Basalt
|
K/Ar
|
WR
|
29.50
|
|
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