Structural map of the central Lepontine Alps

Structural map of the central Lepontine Alps

2
55
75
L IN
TAL
RIS
30
26
F6
25
F4
26
30°
?
690
ANTIGORIO
4
e
.B
UN
VERAMPIO
LE
5
21
OM
P. Osbarino
M
L
I
F4
B
R
SO
78
5
70
CCO
18
40
F6
F4
45
Valle
F4
11
Me
90
NCU
90 S.
cc.
lezzo o
F5
80
9
19
A
MUGHER
CA
29
A
A
OS
R
E
RO
NT 30
ANT
MO
F3 3°
70
5°
IA
S
E
S
5
670
AVES
CAN
110
O
NER
33
28
70
LT
AU
EF
F6
75
32
E
ES
40
AV
CA N 680
33
690
F6
FI
31
90
e
M
Maggia
S.
e
Intragna
zza
Mele
90
e
90
34
34
2
O
NZ
planar structure dip
eclogite
calcite or dolomite marble
20
60
F
4
20°
20
15°
e ee
e
30
25°
90
10°
20°
90
F6
F4
60
e
e
22
e
e
A
OSCI
MERG
e?
ee
e
F4
ee
22
e F4e
Teggiolo Mesozoic cover, Antigorio nappe
4
Leventin basement
5
Leventina Triassic quartzites
6
Campo Tencia basement, Simano nappe
7
Verzasca granitegneiss of Simano nappe
8
Campolungo Triassic of Simano nappe
9
Campolungo calc-schist of Simano unit
10
Monte Leone basement
11
Moncucco (= Monte Leone) basement
12
marble
13
Osbarino basement
14
Lebendun Mesozoic series
15
San Giotgio conglomerates and schists
16
San Giorgio Mesozoic
17
Valais calc-schist
18
Ruginenta basement (= Berisal unit)
19
Camughera (= Siviez Mischabel nappe)
20
Bosco basement
21
Bosco-Bombogno-Isorno-Orselina unit
22
Mergoscia and Cima Lunga HP units
22°
23
Someo Mesozoic series
24
Pertusio Triassic quartzite, U. J. marble
25
Maggia basement
26
Matorello and Cocco granitoids
27
Cristallina Mesozoic of Maggia nappe
28
Monte Rosa basement
29
Antrona HP ophiolites
30
Zermatt-Saas Fee HP ophiolites
31
Sesia basement
32
Canavese basement and Mesozoic series
33
Ivrea amphibolites and peridotites
34
Ivrea stronalites
75
75
21
Locarno
TONALE
1
3
12
ORSELINA
21
3
0
25
Claro
A
Antigorio basement
5
e
75
28 10°
EA
AULT
IVR - LORO F
RE
LO
e
GI
F4
80
F4e
4
e
AG
F6
BORDOGLIO
SE
CANAV E
10°
e
M
9
alli
A 31
A
ntov
ROS 2° 30 S E S I
31°
e
E
C
T
Ascona
ON30
5°
32
5° M
0° 28
F3
ZERMATT-SAAS 45
31
ZIC
CENTO80
Maria Maggiore 90
1°
75
10°
21 ORSELINA
VALLI FAULT
Melezzo ori
entale
Druogno
T
NEGINE N
DomoO
Z
U
N
dossola A
18 R
V
NA
0
MO
ee
Valle Onsernone
S
REMA
R ?C
CHE
0
Brione
12 e
CIMA LUNGA
5°
COCCO
20°
6 e e e M
12°Salmone
90
Ziccher
65
2
F6
12°
M M
Is o r o
e
ura
2
e
7
20°
SALMONE
F6
55
RA
MASE Vigezzo
7°
75
15°
Os
e
ee
75
O
2
O
E
TE
ON
N
EO
F
6
n 75
M
PIODA DI CRANA
AR
78
110
Pioda di Crana
N
60
B
OS
23
SOMEO
ELE
TTO
M
2
Loan a
13
40
Someo
e
BO
IN
O
Toce
28
RG
25
40
e
MAGGIA
Valle di Vergele
tto
F4
10°
13°
e
GN
?
ME
O
25
30
10
F4
20
M
18 22
O
12
BE
1
Rosso di Ribia
M?
25°
ND
TOCE
0
4
10
A
3
0
75
22
VE
22
a
3
e
10°
25
OSA 20
4
0
F4
2
F
6
F6
10
Verz as c
F6
21
a
Biasca
VERZASCA
23
4 6 eSO
F6
Monte Zucchero
SOMEO
CA
BOMBOGNO
BOSCO
Rov
P. Bombogno
308±7Ma
AS
30
naF
5
SIMANO
30
COCCO
RZ
Toc
15
0
Verampio basement
O
e
65
TI
IN
FAULT
2
1
F
6
F6
1
140
C
FU R
KA
e
e
e
24 PERTUSIO
65
26
5
LEGEND
TI
N
Bignasco
7
VE
3
2
Wandfluhhorn LT
U
FA
RK A
20°
E FU
H I TER
10
GUR
INER
ee
6
e
? Brontallo
Ba
vo
Fn4a
43
MERGOSCIA
F
4b
F1
14
A.B
OS
CHER
ZIC
F2
?
TIC
IN
ino
Ti c
3
A
20
30°
Ma
ggi a
50
N
CAMPO TENCIA
NA
F4a
4
O
GL
RO
O
F
F
25 4
SYNCLINE
F2 ANTIFORMAL
35°
F4
60
F4
4
N
F2
F6
IO
P. Campo Tencia
F2
SYNFORMAL
SYNCLINE
F6
VE
LO
20
M
P
MOGNO
Peccia
140
F C 6
P. Cana 6 A
20°
Alpe
Piota
PIOTA
F6
LE
20°
F4
NA
CA
Chiggiogna
IA
NC
TE
IO
E GG
S. Carlo
F4
F2
5°
40°
SAN
G
I
15
by Albrecht Steck, Franco Della Torre,
Franz Keller, Hans-Rudolf Pfeifer and
Henri Masson
TI C
IN
O
5
16
NG
O
O
140
3
MP
CA
65Fusio
A
P. Basodino
CAMPO LU
EV
PR A
30°
I
PIG
AL
F3
LEBENDUN F1
IS
9
45
45
FUSIO
VANISC F4
25
his
t
710
Fiesso
Rodi
90
50° 65°
F 2 Triassi
c
F2
34° CRISTALLINA NGO
10° 8
27
LU
O
MATORELLO
SAMBUCOF4 45°
14
calc
sc
F
2
F4
85 P. Cristallina
80
F
6
±
04
0-3
1 17 VALA
?
85
O
GI
OR
C
T
27
40°
A
AL LIN 45°
60 CRIST
a
A 65
8M
680
670
F4
T
Structural map
of the central
Lepontine Alps
150
FAULT
o
Ticin
10 km
gioreALPINE STRUCTURES
g
a
M
110
Lago
tectonic or stratigraphic boundary
fault
fold axis and plunge
25°
F4b
fold axial trace F1 - F4a- F6
syncline
antiformal syncline
anticline (or F6 crest line)
synformal anticline
AS 2013
1 - 6 Stereographic projections on Fig.6
Fig. 2 Structural map of the Lepontine Alps after field observations by Preiswerk et al. (1934), Hasler (1949), Kobe (1956), Knup (1958), Hunziker (1966), Wieland (1966), Keller (1968), Bianconi (1971), Keller et al. (1980), Colombi (1989), Burri (2005), Steck (1998, 2008), Berger and Mercolli (2006),
Matasci et al. (2011) and unpublished documents by Paul Graeter (†) and Eduard Wenk (†). (Printable version of Fig. 2 in the article by Steck et al. in the Swiss Journal of Geosciences, Volume 106, Number 3, DOI 10.1007/s00015- 013-0135-7)