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ASSOCIAÇÕES PLUTÔNICAS DO COMPLEXO GRANITÓIDE SOCORRO (ESTADOS DE SÃO PAULO E MINAS GERAIS, SE BRASIL)

1993; Sociedade Brasileira de Geologia; Volume: 23; Issue: 3 Linguagem: Inglês

10.25249/0375-7536.1993233265273

2177-4382

Antonio Carlos Artur, Eberhard Wernick, Paul Karl Hörmann, KLAUS WEBER-DIEFENBACH,

Geography and Environmental Studies

The pluriserial Socorro granitoid complex is located in an área highly affected by the convergence and collision of the Paraná and São Francisco plates during the Late Precambrian. The complex is affected by the tectonic periods of thrust, transcurrent and normal faulting which on regional scale express this convergence and collision. The complex comprises four distinct plutonic associations: Socorro I (calc-alkaline, medium/high K), Socorro II (calc-alkaline, high K), Nazaré Paulista (crustal, garnet bearing) and Piracaia (alkaline, polassic). They represem the main regional magmatic activities ocurred roughly between 650 and 550 Ma ago. The Socorro I association can be considered as linked with the convergent stage and the Nazaré Paulista association with the collisional stage of the plates. The Socorro II association is the magmatic product of the late-collision uplift and the Piracaia association is linked with the post-collision relaxing stage. The periods of emplacement of the four plutonic associations show partial temporal overlaps which reflects the gradual transitions between the successive stages in the regional geodynamic evolution.