Geology Reference
In-Depth Information
Fig. 7
Detail map of the Awsard
area (excerpt of the Geological
map of Morocco, scale 1:50,000),
with location of geosites
A6-A9
and trace of cross-section Fig.
10
.
The inner part of the syenite
intrusion is made up of kalsilite
syenite (Bea et al.
2013
)
Fig. 8 a
View of the rounded
hills of nepheline syenite next to
Awsard,
b
Magmatic lineation
marked by feldspar preferred
orientation on a
vertical
fracture
of the syenite,
c
Dliyat N
'
sour
migmatite with large basic blocks
crosscut by granite veins,
d
Laglat mica-schists showing
superimposed structures (notice
the isoclinal fold on the
left
) with
shear bands indicating top-to-the-
east kinematics
Geosite A9
can be reached by a short drive (ca 2 km) to the
NW on the road to Dakhla, then to the NNE over ca 2 km
more on a gravel road, and
intrusion and the basic dyke swarm are clearly seen amidst
whitish, eroded granitic country rocks. Moreover, this site
allows the visitors to observe the didactic unconformity
between the 3 Ga-old basement and its Late Ordovician cover
(Ashgill = Hirnantian, 445 Ma). The latter consists of pebbly
nally, a short walk to the hill.
The Dliyat En
Sour hill offers a beautiful panorama of the
Reguibat Shield around Awsard (Fig.
9
). The syenite
'
