The study of rocks related to Pilar Complex of the Açungui Group, which occur immediatelyto the SSE of São Paulo, revealed the existence of four distinct metamorphic episodes. The first one, regional in scale and progressive in character, attained its peak at temperatures around 700°C and pressure over 5,5 kbar, compatible with amphibolite fades or medium grade conditions. The second episode, also regional in scale, was probably a metasomatic event, promoted by aqueous acidic (low pH), B and K-rich solutions, remanents of former magmatic activity. The third episode, a retrograde one, was brought about by the adaptation of high P/T assemblages, ascribable to M1, to milder conditions, whilst the forth one corresponds to a structural and textural answer of rocks to movements along the fault zones.
