The pathways followed by the crude are shown in the triangular 

 diagram of the saturated and aromatic hydrocarbons, and the polar 

 compounds (resins + asphaltenes) (Fig. 24). 



P, PortsMl 22.?3.7!< 



P, Portsoll 23.C3.7P 



t} Portiall 4. CM. 79 



G^ Gui99nny 23.C?.?" 



Cj Gulssany 4.G1.7*! 



5 Drlgnopan i."i.7° 



rc noicirr 3.r3.7i 



in / ••• 



/■■■■"> 



SM. 



00&mm§ 





RES.+ ASPH.) 



FIGURE 24. Triangular diagram of the distribution by chemical family. 



For the sake of comparison, we have added the corresponding values in 

 samples of polluted sands and a subtidal sediment taken in the Aber 

 Wrac'h (AW 9) . 



Intertidal Sediments - Polluted Beach Sands 



The program of analysis employed for the study of these sands is 

 identical to that used for the subtidal sediments of the Aber Wrac'h 

 (Fig. 2). The characteristics of these samples are seen in Table 3. 



The sulfur contents of these polluted sands (2.5-2.6 %) are all 

 slightly higher than those of the emulsions — even the most advanced 

 (2.3-2.4 %) , but are about the same as those in samples taken from the 

 Aber Wrac'h. This evolution is explained by the disappearance of 



137 



