0.44
Nieto-Obregón et al. 1981
|
|
|
|
|
|
|
|
|
393
|
SW Tepic, Nay.
|
-104.96
|
21.36
|
Andesite
|
K/Ar
|
Pl
|
20.40
|
2.90
|
Gastil et al. 1979
|
|
|
|
|
|
|
|
|
*
|
Pachuca-Real del Monte, Hgo.
|
-98.74
|
20.15
|
Andesite
|
K/Ar
|
Adu
|
20.30
|
0.50
|
McKee et al., 1992
|
|
|
|
|
|
|
|
|
NA 41
|
Nazas, Dur.
|
-104.30
|
25.42
|
Alk. Basalt
|
K/Ar
|
WR
|
20.30
|
0.4
|
Aguirre & McDoweell, 1993
|
|
|
|
|
|
|
|
|
CM 6
|
Cinco Minas, Ags.
|
-103.93
|
21.05
|
Ignimbrite
|
K/Ar
|
San
|
20.20
|
0.50
|
Nieto-Obregón et al. 1985
|
|
|
|
|
|
|
|
|
|
|
|
|
Ignimbrite
|
K/Ar
|
San
|
20.00
|
2.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
Taf 1
|
Paso Ancho, Tafetan, Mich.
|
-100.93
|
19.50
|
Basalt
|
K/Ar
|
WR
|
20.00
|
1.00
|
Pasquarè et al., 1991
|
|
|
|
|
|
|
|
|
Ped Jal 3
|
Veta Rica
|
-103.73
|
21.88
|
Basalt
|
K/Ar
|
WR
|
19.86
|
0.40
|
Nieto-Obregón et al. 1981
|
|
|
|
|
|
|
|
|
|
Magdalena Apaxco, Oax.
|
|
|
Ignimbrite
|
K/Ar
|
Pl
|
19.30
|
0.50
|
Ferrusquia & McDowell, in press
|
|
|
|
|
|
|
|
|
Ped Nay 8
|
RGS, N di Santa Fe, Nay.
|
-104.40
|
21.35
|
Andesite-bas.
|
K/Ar
|
WR
|
19.55
|
0.41
|
Damon et al., 1979
|
|
|
|
|
|
|
|
|
RGS 10
|
S.Pedro Analco, Ags.
|
-103.96
|
21.10
|
Felspar dike
|
K/Ar
|
Feld
|
19.50
|
0.50
|
Nieto-Obregón et al. 1985
|
|
|
|
|
|
|
|
|
*B
|
Calera de Cofrados, Nay.
|
-104.73
|
21.61
|
Ignimbrite
|
K/Ar
|
|
19.40
|
0.60
|
Soto and Ortega, 1982
|
|
|
|
|
|
|
|
|
Ped Nay 9
|
RGS, N di Santa Fe, Nay.
|
-104.42
|
21.33
|
Ignimbrite
|
K/Ar
|
Hb
|
19.03
|
0.40
|
Damon et al., 1979
|
|
|
|
|
|
|
|
|
GTO 16
|
San José de los Allende, Gto.
|
|
|
Ignimbrite
|
Ar/Ar
|
San
|
18.90
|
0.40
|
Cerca-Martínez, 1998
|
|
|
|
|
|
|
|
|
F-8-1
|
El Quelite, Sin.
|
-106.48
|
23.49
|
Ignimbrite
|
K/Ar
|
Pl
|
18.90
|
0.50
|
Henry & Fredrikson, 1987
|
|
|
|
|
|
|
|
|
*C
|
El Sordo, (Aguamilpa), Nay.
|
-104.80
|
21.84
|
Ignimbrite
|
K/Ar
|
|
18.70
|
1.10
|
Soto and Ortega, 1982
|
|
|
|
|
|
|
|
|
PR 103
|
Los Jacalitos, Jal.
|
|
|
Andesite
|
Ar/Ar
|
gms
|
21.80§
|
0.30
|
Ferrari et al., in prep.
|
|
|
|
|
|
|
|
|
165
|
Compostela, Nay.
|
-105.06
|
21.20
|
Rhyolite
|
K/Ar
|
Pl
|
18.50
|
0.70
|
Gastil et al. 1979
|
|
|
|
|
|
|
|
|
*D
|
El Sordo, (Aguamilpa), Nay.
|
-104.43
|
21.81
|
Qz-Monzonite
|
K/Ar
|
|
18.30
|
1.40
|
Soto and Ortega, 1982
|
|
|
|
|
|
|
|
|
Mex 215
|
SSE Indaparapeo, Mich.
|
-100.86
|
19.73
|
Andesite
|
K/Ar
|
WR
|
18.20
|
0.60
|
Pasquarè et al., 1991
|
|
|
|
|
|
|
|
|
404
|
Compostela, Tepic
|
-104.91
|
21.25
|
Rhyolite
|
K/Ar
|
Feld
|
18.10
|
0.80
|
Gastil et al. 1979
|
|
|
|
|
|
|
|
|
Mx 88-31
|
Presa Cointzio, Mich.
|
-101.27
|
19.63
|
Ignimbrite
|
K/Ar
|
Pl
|
18.00
|
0.50
|
Pasquarè et al., 1991
|
|
|
|
|
|
|
|
|
EN 119
|
W Sierra Penjamo, Jal.
|
-101.95
|
20.48
|
Basalt
|
K/Ar
|
WR
|
17.60
|
0.90
|
Jacobo-Albarrán, 1986
|
|
|
|
|
|
|
|
|
Hz 23
|
Zitacuaro area, Mich.
|
-100.17
|
19.53
|
Andesite
|
K/Ar
|
gms
|
17.60
|
1.00
|
CFE, 1992b
|
|
|
|
|
|
|
|
|
EN 182
|
W Villa de Allende, Mex.
|
-100.01
|
19.46
|
Dacite
|
K/Ar
|
WR
|
17.30
|
1.00
|
Jacobo-Albarrán, 1986
|
|
|
|
|
|
|
|
|
PHC 85
|
El Cajon, Nay.
|
-104.50
|
21.45
|
Granite
|
K/Ar
|
Bio
|
17.20
|
1.00
|
Rodriguez-C. and Rodriguez-T., 1992
|
|
|
|
|
|
|
|
|
|
|
|
|
Ignimbrite
|
K/Ar
|
San
|
17.00
|
1.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
Hz 3
|
Zitacuaro, Mich.
|
-100.14
|
19.40
|
Andesite
|
K/Ar
|
gms
|
17.00
|
1.00
|
CFE, 1992b
|
|
|
|
|
|
|
|
|
Ped Jal 22
|
Presa S. Rosa, Jal.
|
-103.72
|
20.92
|
Ignimbrite
|
K/Ar
|
Pl
|
16.90
|
0.50
|
Nieto-Obregón et al. 1985
|
|
|
|
|
|
|
|
|
Mx 88-3
|
C. Garnica, Mich.
|
-100.82
|
19.65
|
Andesite
|
K/Ar
|
Pl
|
16.20
|
0.80
|
Pasquarè et al., 1991
|
|
|
|
|
|
|
|
|
UAKA 79-12
|
RGS west bank, Nay.
|
-104.72
|
21.80
|
Latite
|
K/Ar
|
WR
|
16.20
|
0.34
|
Clark et al., 1981
|
|
|
|
|
|
|
|
|
|
Yautepec, Oax.
|
|
|
Ignimbrite
|
K/Ar
|
|
16.10
|
|
Ferrusquia & McDowell, in press
|
|
|
|
|
|
|
|
|
|
|
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