|
|
|
1156
|
S. Vallejo, Nay.
|
-105.20
|
20.95
|
Gabbro
|
K/Ar
|
Pl
|
13.30
|
2.00
|
Gastil et al. 1979
|
|
|
|
|
|
|
|
|
79-20
|
El Zopilote, Nay.
|
-104.93
|
21.96
|
Ignimbrite dac.
|
K/Ar
|
Pl
|
13.21
|
0.35
|
Clark et al., 1981
|
|
|
|
|
|
|
|
|
|
La Ordeña, Gto.
|
-101.80
|
20.68
|
Andesite
|
K/Ar
|
WR
|
13.20
|
0.20
|
Hasenaka et al., 1994
|
|
|
|
|
|
|
|
|
AG 47
|
El Sauz, Gto.
|
|
|
Andesite
|
K/Ar
|
gms
|
13.20
|
0.20
|
Aguirre and Lopez, unpublished
|
|
|
|
|
|
|
|
|
GTO 6
|
San José de los Allende, Gto.
|
|
|
Basalto
|
Ar/Ar
|
gms
|
12.70§
12.50§
|
0.30
0.30
|
Cerca-Martínez, 1998
|
|
|
|
|
|
|
|
|
Hz 22
|
Zitacuaro area, Mich.
|
-100.27
|
19.57
|
Andesite
|
K/Ar
|
gms
|
13.10
|
1.00
|
CFE, 1992b
|
|
|
|
|
|
|
|
|
|
|
|
|
Rhyolite
|
K/Ar
|
Feld
|
13.00
|
1.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
|
|
|
|
Andesite
|
K/Ar
|
WR
|
13.00
|
0.80
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
|
|
|
|
Andesite
|
K/Ar
|
WR
|
13.00
|
1.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
GTO 14
|
Mesa el Gato, Gto.
|
|
|
Basalto
|
Ar/Ar
|
WR
|
12.50
|
0.20
|
Cerca-Martínez, 1998
|
|
|
|
|
|
|
|
|
|
|
|
|
Basalt
|
K/Ar
|
WR
|
13.00
|
1.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
*G
|
Calera de Cofrados, Nay.
|
-104.73
|
21.61
|
Trachyte
|
K/Ar
|
|
12.90
|
0.50
|
Soto and Ortega, 1982
|
|
|
|
|
|
|
|
|
RK 13
|
Metates, Dur.
|
-105.07
|
23.87
|
Alk. Basalt
|
K/Ar
|
Pl
|
12.60
|
1.3
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
*
|
Candelaria, Ver.
|
-96.49
|
19.74
|
Microdiorite
|
K/Ar
|
|
12.60
|
0.00
|
Negendank et al. 1985
|
|
|
|
|
|
|
|
|
1153
|
S. Vallejo, Nay.
|
-105.40
|
20.91
|
Basaltic dike
|
K/Ar
|
WR
|
12.60
|
0.40
|
Gastil et al. 1979
|
|
|
|
|
|
|
|
|
-
|
N of S. M. de Allende, Gto.
|
-100.76
|
21.00
|
Basalt
|
K/Ar
|
WR
|
12.50
|
0.90
|
Carranza-Castaneda et al., 1994
|
|
|
|
|
|
|
|
|
RK 24
|
Metates, Dur.
|
-104.86
|
23.93
|
Alk. Basalt
|
|
Amph
|
12.40
|
0.4
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
EN 11
|
N Zimampan, Pach.
|
-99.20
|
20.86
|
Andesite
|
K/Ar
|
WR
|
12.40
|
0.60
|
Jacobo-Albarrán, 1986
|
|
|
|
|
|
|
|
|
*
|
Candelaria, Ver.
|
-96.49
|
19.74
|
Microdiorite
|
K/Ar
|
|
12.30
|
0.00
|
Negendank et al. 1985
|
|
|
|
|
|
|
|
|
Nucleo 5
|
Copilco 1 well, DF -1700
|
-99.08
|
19.40
|
Basalt
|
K/Ar
|
WR
|
12.30
|
1.00
|
Jacobo-Albarrán, 1986
|
|
|
|
|
|
|
|
|
Nucleo 7
|
Tulyehualco 1 well, D.F. -1330
|
-99.08
|
19.40
|
Basalt
|
K/Ar
|
WR
|
12.20
|
0.60
|
Jacobo-Albarrán, 1986
|
|
|
|
|
|
|
|
|
EN 114
|
Sierra Gavilan, Pur.
|
-101.49
|
20.03
|
Andesite
|
K/Ar
|
WR
|
12.12
|
0.20
|
Jacobo-Albarrán, 1986
|
|
|
|
|
|
|
|
|
Jag 3
|
Palo Huerfano volcano., Gto.
|
-101.71
|
20.83
|
Andesite
|
K/Ar
|
Pl
|
12.10
|
0.60
|
Perez-Venzor et al., 1997
|
|
|
|
|
|
|
|
|
-
|
Cerro Cubilete, Gto.
|
-101.37
|
21.02
|
Basalt
|
K/Ar
|
WR
|
12.10
|
0.20
|
Aguirre-Diaz et al., 1997
|
|
|
|
|
|
|
|
|
S 1
|
E Arandas, Jal.
|
-102.20
|
20.67
|
Basalt
|
K/Ar
|
WR
|
12.00
|
2.00
|
Verma et al. 1985
|
|
|
|
|
|
|
|
|
|
|
|
|
Porfido
|
K/Ar
|
Pl
|
12.00
|
1.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
79-19
|
El Zopilote, Nay.
|
-104.96
|
21.96
|
Bas.-And. dike
|
K/Ar
|
WR
|
11.92
|
0.26
|
Clark, 1981
|
|
|
|
|
|
|
|
|
EN 38
|
E S.Juan del Rio, Pach.
|
-99.84
|
20.36
|
Andesite
|
K/Ar
|
WR
|
11.88
|
0.60
|
Jacobo-Albarrán, 1986
|
|
|
|
|
|
|
|
|
Nucleo 10
|
Tulyehualco 1 well, DF -1898
|
-99.10
|
19.40
|
Andesite
|
K/Ar
|
WR
|
11.80
|
1.90
|
Jacobo-Albarrán, 1986
|
|
|
|
|
|
|
|
|
RK 12
|
Metates, Dgo.
|
-104.87
|
23.92
|
Alk. Basalt
|
K/Ar
|
Amph
|
11.70
|
0.3
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
*H
|
Presa el Bañadero, Nay.
|
-104.72
|
21.59
|
Rhyolite
|
K/Ar
|
WR
|
11.60
|
0.70
|
Soto and Ortega, 1982
|
|
|
|
|
|
|
|
|
|
Metates, Dgo.
|
-104.87
|
23.92
|
Alk. Basalt
|
Ar/Ar
|
WR
|
11.59
|
0.05
|
Henry & Aranda-Gomez, 1997
|
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