Mineral Resources Potential - Geothermal Resources

g
8
2
550-500
Ma?
Y7
Pan African omgen
Geological outline 1 7
2.2 An overview of the main structuml features in Ethiopia
The Precambrian
WYEHT
W-udmm
sedimenta~y -
ultlamfk
belts
(Neoproiemzolc
'lhre wries)
Gmnite-
GwW
TmW
possi~.
reworked -
~emoblilred
pm
mqmmb
(1 2 - 0.9
Gal7
Maln bxpo~urer hletamrphic rocks U
ln BYkw
N. pOst-l6dmk
E ~ ~ I ttudvsa O ~
IrIgaY)
, w,
Emiopia
' ponegal
S.
Ethkpla
(Sibwno)
E.
Efiw.
(Hams)
Granuk
fscle~ In S and
Ethiopia
lwgnde blrnodal
ate- votcano
a-lary island.
The Pre-Cambrian basement structures constitute the oldest
structures which also controlIed later stnrctural patterns. Two major
Precmbri an (Neoproterozoic) tectono-stratigraphic units are
recognized in Ethiopia: high-grade gneiss and low-grade meta-
sediments (Fig. l ) . The gneissic *mck consists of polydeformed and
metamorphosed schists and gneisses (biotite-hornblende gneiss and
mphibolites). These rocks are comparable to the predominantly
grreissic terraines of the Mozambique Belt described by Vail(1987,
1988). The low-grade metamorphic volcano-sedimentary units
consist of amphibolite, cmbonaceous quartz-mica schist, chlorite-
arc
W cph~olitZc sultes
~ P W
psammltlc -
M~c met
sediment& mema
Wdle Cornplei')
Hie-
po(YmetamoQhased
h h h a
gnairgm.
mlgrnatites
("Lower Complefl
Au,PGE, Ht
1Co)
Cu, Cr
fe' Ti. (w W)
Ta, (Nb, REE.
s
, .u. m)
3k, Feld,
ya. Qr Kln,
&
TIC,