After listening to the Vangelis music, I compared the cymbal crash sounds with my Emulator-I library.
I didn't find an exact match, but one percussion sound set contains a "long" cymbal crash which sounds similar (although at a lower pitch).
I don't have a library reference ID for this particular sound set, but on my disk it has been combined with a lower sound set originating from percussion library disk 53.
The sound is not exactly the same, especially the beginning is different, perhaps Vangelis combined it with another sound.
But to be honest... I think he used another sound source