137 / 352
6. PROVENANCE OF THE HP-HT UPPER ALLOCHTHON
121
MORB – depleted mantle
2
5
8
5
0
–5
–10
–15
–20
–25
CHUR
(
n
= 42)
Armorica
(Gerdes & Zeh, 2006)
0.5
1.0
1.5
2.0
2.5
3.0 (Ga)
13
27
40
MORB – depleted mantle
5
0
–5
–10
–15
–20
–25
Ganderia
(Willner
et al
., 2014)
CHUR
(
n
= 292)
0.5
1.0
1.5
2.0
2.5
3.0 (Ga)
38
77
116
MORB – depleted mantle
5
0
–5
–10
–15
–20
–25
CHUR
Avalonia
(Willner
et al
. 2013)
(
n
= 600)
0.5
1.0
1.5
2.0
2.5
3.0 (Ga)
13
27
40
MORB – depleted mantle
5
0
–5
–10
–15
–20
–25
CHUR
NE Laurentia
(Willner
et al
., 2014)
(
n
= 332)
0.5
1.0
1.5
2.0
2.5
3.0 (Ga)
12
25
37
MORB – depleted mantle
5
0
–5
–10
–15
–20
–25
CHUR
(
n
= 267)
West Africa
(Abati
et al
., 2012)
0.5
1.0
1.5
2.0
2.5
3.0 (Ga)
20
40
60
81
MORB – depleted mantle
5
0
–5
–10
–15
–20
–25
0.5
1.0
1.5
2.0
2.5
3.0
CHUR
(Ga)
HP-HT Variscan
unit
(This study)
(
n
= 456)
εHf
(
t
)
εHf
(
t
)
εHf
(
t
)
εHf
(
t
)
εHf
(
t
)
εHf
(
t
)
Fig. 10.
Schematic
e
Hf
(
t
)
v.
age for detrital zircon from data presented herein and from Gerdes & Zeh (2006), Abati
et al.
(2012)
and Willner
et al.
(2013, 2014). Light purple shaded areas represent crustal evolution trends of zircon that might have originated
from common crustal domains. Vertical yellow shaded areas represent mixing between juvenile and recycled crustal material, most
likely formed in magmatic arcs. Light blue shaded areas at the base of each plot are density distributions of the considered zircon
(aKDE, DensityPlotter5.0 software, Vermeesch, 2012). Figure modified from Willner
et al.
(2014).
©
2015 John Wiley & Sons Ltd
PROVENANCE OF THE HP
–
HT VARISCAN TERRANE
971