Abstract In the current study, an integration of Enhanced
Thematic Mapper Plus (ETM+), field, and laboratory data
have been used for lithological mapping of different
granitic phases in the Kadabora area, Eastern Desert, Egypt.
Application of enhancement techniques, including a new
proposed band ratio combination (ratio 5/3, 3/1, 7/5 in
RGB, respectively) and supervised classification images are
used in discriminating different granitic phases in the
Kadabora pluton from each other and from their environs.
The data have been proved with the help of field and
geochemical investigations. The results revealed that: (1)
the Kadabora granitic pluton could be distinguished into
three phases that recognized by field and laboratory
investigation including granodiorite (phase I), monzogranite
(phase II), and syeno-alkali feldspar granite (phase III).
These phases are arranged according to their relative ages
while the country rocks include ophiolitic mélange and
metagabbro–diorite complex. It is also confirmed that the
granitic pluton is invaded by dyke swarms which is
trending in N–S direction. Geochemically, results show
that the granodiorite is calc-alkaline, I-type and formed
under subduction tectonic regime. Monzogranite falls
within the alkaline and highly fractionated calc-alkaline
granites, whereas syeno-alkali feldspar granite extends into
proper alkaline granitoids field. Monzogranite and syenoalkali
feldspar granite belong to the A2-subtype granite.
This A2-subtype granite was probably formed in an
extensional regime, subsequent to subduction which can
lead to tensional break-up of the crust (i.e., post-collisional,
post-orogenic granites). The monzogranite and the syenoalkali
feldspar granite were probably formed by partial
melting of relatively anhydrous lower crust source and/or
tonalite to granodiorite is viable alternative to the granulite
source.