36°S
75°W
74°W
73°W
72°W
71°W
70°W
69°W
68°W
Itata
Basin
%
67°W
Morphotectonic units
Nazca Plate
37°S
Continental Slope
Continental Shelf
Bí o
-Bí
o
Coastal Platform
FZ
Coastal Cordillera
Chile
M
Vill ochaaric
aF
Z
Agrio
thrust
belt
lh
na
La
Co
rta
de
ras
lin
e
igh
Huincul h
FZ
Valdivia
Basin
Central Depression
Principal Cordillera
Neogene back-arc
basins
Neuquén Basin
ue
39°S
38°S
Arauco
Basin
Argentina
Cordillera del Viento
massif
San Rafael massif
40°S
North Patagonian
massif
Forearc basin
Quaternary
arc volcanics
Somuncura
plateau limit
fqui F
Chiloé
Basin
Liquiñ
e -O
42°S
41°S
Z
Pucatrihue
Basin
Major faults
Inferred faults
Somuncura
plateau
Figure 1. Morphotectonic units and major faults of the south-central Andes.
0
50
kilometers
100
36°S
75°W
74°W
73°W
%
72°W
71°W
70°W
69°W
68°W
67°W
Forearc
Intra-arc
Back-arc/
foreland
Qs
Qv
Qb
Chillán
Concepción
re nch
TQb
TQs
hile T
Pa cific
Ocean
TQsp
Pe rú-C
37°S
PQv
Chos Malal
Los Angeles
Ta
38°S
Tv
Tba
Arauco
Peninsula
Tm
Argentina
Tfv
Chile
Isla
Mocha
KT
Kfg
Temuco
JrTg
39°S
Neuquén
JrKnb
Jrg
Tr
PzTr
Pzg
40°S
Valdiv ia
P
Pz1
Bahía
Mansa
Pz2
Pz
Osorno
41°S
L
Bariloche
Major lakes
Major faults
Rev erse
Maquinchao
Normal
Pto.
Montt
Strike-slip
Undif f erentiated
42°S
0
Chiloé
50
kilometers
Figure 2. Geologic map compilation of the south-central Andes.
100
Oligo. Miocene Plio. Q.
Cenozoic
Forearc
Intra-arc
Back-arc & foreland
Qb
Qv
Qs
TQb
PQv
TQs
Tba
Ta
TQsp
Tv
Tfv
Cretaceous
KT
JrTg
Kfg
Jurassic
JrKnb
Dev.Ca. P. Triassic
Paleozoic
Mesozoic
Pal. Eocene
Tm
Jrg
Tr
PzTr
Pz1
Pz2
Pzg
P
Pz
Figure 3. Space-time diagram of the geologic units.