|
|
Andesite
|
K/Ar
|
WR
|
27.00
|
2.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
|
|
|
|
Granodiorite
|
K/Ar
|
Bio
|
27.00
|
2.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
|
Sta. Maria Tlaxiaco, Oax.
|
|
|
Ignimbrite
|
K/Ar
|
|
27.00
|
|
Moran-Zenteno et al. unpub.
|
|
|
|
|
|
|
|
|
*
|
Panalillo, SLP
|
-101.16
|
21.82
|
Ignimbrite
|
K/Ar
|
WR
|
26.80
|
1.30
|
Labarthe-Hernandez et al., 1982
|
|
|
|
|
|
|
|
|
CM 2
|
Cinco Minas, Ags.
|
-103.91
|
21.03
|
Microdiorite Dike
|
K/Ar
|
gms
|
26.70
|
0.60
|
Nieto-Obregón et al. 1985
|
|
|
|
|
|
|
|
|
RGS 11
|
S. Pedro Analco, Ags.
|
-103.95
|
21.08
|
Granodiorite
|
K/Ar
|
Hb
|
26.60
|
0.60
|
Nieto-Obregón et al. 1985
|
|
|
|
|
|
|
|
|
*3
|
Mojarras, Nay.
|
-104.44
|
21.37
|
Diorite
|
K/Ar
|
WR
|
26.20
|
3.10
|
Gastil, 1975
|
|
|
|
|
|
|
|
|
|
|
|
|
Rhyolite
|
K/Ar
|
San
|
26.00
|
2.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
|
Magdalena Zahuatlan, Oax.
|
|
|
Ignimbrite
|
K/Ar
|
San
|
26.00
|
|
Moran-Zenteno et al. unpub.
|
|
|
|
|
|
|
|
|
LP476
|
Juchipila, Zac.
|
-103.00
|
21.51
|
Ignimbrite
|
FT
|
Zr
|
25.90
|
2.50
|
Webber et al., 1994
|
|
|
|
|
|
|
|
|
|
La Ordeña, Gto.
|
-101.01
|
20.68
|
Rhyolite
|
K/Ar
|
WR
|
25.90
|
0.20
|
Hasenaka et al., 1994
|
|
|
|
|
|
|
|
|
HR467
|
Juchipila, Zac.
|
-103.18
|
21.50
|
Ignimbrite
|
FT
|
Zr
|
25.30
|
2.40
|
Webber et al., 1994
|
|
|
|
|
|
|
|
|
BQ483
|
Juchipila, Zac.
|
-103.30
|
21.45
|
Ignimbrite
|
FT
|
Zr
|
25.20
|
2.20
|
Webber et al., 1994
|
|
|
|
|
|
|
|
|
|
|
|
|
Andesite
|
K/Ar
|
WR
|
25.00
|
2.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
HR460
|
Juchipila, Zac.
|
-103.17
|
21.50
|
Ignimbrite
|
FT
|
Zr
|
24.90
|
2.70
|
Webber et al., 1994
|
|
|
|
|
|
|
|
|
AMC-03
|
La Sauceda, Gto.
|
-101.17
|
20.89
|
Ignimbrite
|
K/Ar
|
San
|
24.80
|
0.60
|
Nieto-Samaniego et al., 1996
|
|
|
|
|
|
|
|
|
BV 12
|
Buenavista, Gro.
|
-99.37
|
18.48
|
Ignimbrite
|
K/Ar
|
Hb
|
24.80
|
1.30
|
Alba-Aldarve et al., 1996
|
|
|
|
|
|
|
|
|
CM 3
|
Cinco Minas, Ags.
|
-103.90
|
21.03
|
Andesite
|
K/Ar
|
gms
|
24.70
|
0.60
|
Nieto-Obregón et al. 1985
|
|
|
|
|
|
|
|
|
DCH 1
|
Cueramaro, Gto.
|
-101.67
|
20.22
|
Rhyolite
|
K/Ar
|
San
|
24.70
|
1.00
|
Castillo-Hdz. and Romero-Rios, 1991
|
|
|
|
|
|
|
|
|
SLP 9
|
Matehuala
|
|
|
Rhyolite
|
K/Ar
|
San
|
24.38
|
1.20
|
Ferrari unpublished
|
|
|
|
|
|
|
|
|
SL29
|
Nazas, Dur.
|
-104.20
|
25.26
|
Alk. Basalt
|
K/Ar
|
WR
|
24.30
|
0.5
|
Aguirre & McDoweell, 1993
|
|
|
|
|
|
|
|
|
DCH 3
|
Cerro Grande, Jal.
|
-102.02
|
20.67
|
Ignimbrite
|
K/Ar
|
San
|
24.10
|
0.80
|
Castillo-Hdz. and Romero-Rios, 1991
|
|
|
|
|
|
|
|
|
|
|
|
|
Rhyolite
|
K/Ar
|
San
|
24.00
|
3.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
|
|
|
|
Ignimbrite
|
K/Ar
|
San
|
24.00
|
2.00
|
IMP, UNPUBLISHED
|
|
|
|
|
|
|
|
|
3-71-3- F
|
SE of El Salto, Dgo.
|
-105.32
|
23.75
|
Ignimbrite
|
K/Ar
|
Feld
|
23.90
|
0.50
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
|
|
|
N of San Ignacio, Sin.
|
-106.43
|
24.06
|
Rhyolitic dike
|
K/Ar
|
Bio
|
23.80
|
0.30
|
Henry & Fredrikson, 1987
|
|
|
|
|
|
|
|
|
UAKA 82-01
|
El Rosario, Bolanos, Zac.
|
-103.90
|
21.67
|
Andesite
|
K/Ar
|
Pl
|
23.70
|
0.60
|
Scheubel et al., 1988
|
|
|
|
|
|
|
|
|
FM291
|
Juchipila, Zac.
|
-103.02
|
21.43
|
Ignimbrite
|
K/Ar
|
WR
|
23.70
|
1.40
|
Webber et al., 1994
|
|
|
|
|
|
|
|
|
Ped Jal 15
|
P. La Cuna, Jal.
|
-103.78
|
21.01
|
Ignimbrite
|
K/Ar
|
Pl
|
23.60
|
0.50
|
Nieto-Obregón et al. 1981
|
|
|
|
|
|
|
|
|
79-02
|
Las Canoas, Nay.
|
-104.32
|
22.43
|
Ignimbrite
|
K/Ar
|
Feld
|
23.51
|
0.50
|
Clark et al., 1981
|
|
|
|
|
|
|
|
|
3-71-4 P
|
W of El Salto, Dgo.
|
-105.42
|
23.76
|
Ignimbrite
|
K/Ar
|
Pl
|
23.40
|
0.50
|
McDowell & Keitzer, 1976
|
|
|
|
|
|
|
|
|
3-71-6 F
|
W of Las Adjuntas, Dgo.
|
-105.52
|
23.75
|
Ignimbrite
|
K/Ar
|
Feld
|
23.30
|
0.50
|
McDowell & Keitzer, 1977
|
|
|
|
|
|
|
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