Geology Reference
In-Depth Information
X>Y>Z
LS
X > Y = Z
L
X = Y > Z
S
N
50
45
50
25
40
F
70
70
70
25
45
75
60
40
40
45
45
Meenalargan
Complex
20
85
60
70
60
G 2A
90
10
G 2B
25
90
20
55
75
65
80
G 1
Superimposed strain
related to main Donegal
pluton shear zone
65
80
70
1km
C
S
Figure 7.22 Synthesis of field date from in and around the Ardara pluton,
Donegal. Fabrics and structures within the pluton and country rock including
magmatic foliation planes, (dip degrees numbered), lineations, kinematic mark-
ers (insert shows S-C fabrics and asymmetric, sheared enclaves) and progressive
flattening of magmatic enclaves (plane strain) towards the outer margin. Together
with petrographic variations (Ardara pluton is compositionally zoned), these
structures suggest a pulsed emplacement history dominated by in-situ ballooning
of magma.
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