The 
rem: 
inde 
2.2 Characterization by ferric iron and discriminate between the rich iron alteration and those 
acidity indices having the higher content kaolinite, related with 
Uranium mineralization (Hallalouche, D.,1995b) . These N 
two indices were defined by Cervelle and Al, 1988a. The | is 
iron index is expressed by equation (1): | 
  
The ferric iron index calculation well related to the iron 
content (figure 2) and the acidity index ( figure 3) 
(which is the optic translation of the geochimical content 
of the rich rocks in clear mineral and essentially the 
aluminosilicate) was used respectively in order to 
F3, = (tm3-tm2)/(tm3-tm4) (1) 
  
qm - [ a 
LEGEND Q 3 Km 
  
CU  Tonality of iron index EHE Tonality of acidity index 
Figure 2. The Application of the Iron Index to the Alteration Profile 3. 
Wheareas the acidity index A, is calculated by the relation : | In a 
| geok 
Am = (tm2+tm3+tm4)/100 (2) Azac 
map 
dese; 
their 
ther: 
It is 
geok 
speci 
owin 
the | 
spec 
outcı 
nece 
  
  
  
estat 
wheı 
of th 
struc 
6Km | gran 
  
  
  
LEGEND | 
EH The tonality of iron index C3 The tonality of acidity index | struc 
Figure 3. The Application of the Acidity Index to the Alteration Profile 
604 International Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998 |