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In 1971, following study with Gilles Tremblay, he began a period of three years' study in Europe, first with Gottfried Michael Koenig at the Institute for Sonology in Utrecht, and then in Cologne with Karlheinz Stockhausen.
He later studied orchestration with Norbert Rosseau, and serial technique and electronic composition with Gottfried Michael Koenig and De Meester.
Mariétan studied first at the Geneva Conservatory in 1955–60 with Marescotti, and later with, amongst others, Pierre Boulez, Bernd Alois Zimmermann, Gottfried Michael Koenig, Henri Pousseur, and Karlheinz Stockhausen, and his earliest works are squarely in the serialist camp (Muggler 2001).