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Caracterização estrutural de um segmento da rampa lateral de Capitólio, limite norte da nappe de Passos (MG)

2009; Sociedade Brasileira de Geologia; Volume: 39; Issue: 2 Linguagem: Inglês

10.25249/0375-7536.2009392360374

2177-4382

Tiago Eloi de Souza Sério dos Santos, Luiz Sérgio Amarante Simões,

Geography and Environmental Studies

The northern edge of Passos nappe, southwest of Minas Gerais state, is marked by a lateral ramp system called Capitólio Lateral Ramp. This ramp is the contact of the Internal and External domains of the Southern segment of the Brasilia Fold Belt. A detailed study of these domains permits to consider a model for the evolution of this ramp, explained as the vertical structures, which marks External Domain, changing to sub-horizontal structures verified in Internal Domain, both striking NW-SE. The contact between these domains is distinguished by a later thrust (D3) which obliterates the initial registers of the development of the lateral ramp, a steep plane (D2). The covered portion of this history involved complex deformation models, where by rotation of the vorticity axis is possible to see a transition of a vertical to horizontal Y-Monoclinic Shear Zone, respectively in the ramp and flat of the nappe.