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Sistema de nappes Andrelândia, setor oriental: litoestratigrafia e posição estratigráfica

2007; Sociedade Brasileira de Geologia; Volume: 37; Issue: S4 Linguagem: Inglês

10.25249/0375-7536.200737s44760

ISSN

2177-4382

Autores

Mário da Costa Campos Neto, Valdecir Assis Janasi, Miguel Ângelo Stipp Basei, Oswaldo Siga Júnior,

Tópico(s)

Geological and Geochemical Analysis

Resumo

The Andrelândia Nappe System represents a crustal segment subducted under the Paranapanema Plate (Socorro-Guaxupé Nappe), which is allochthonous over the passive margin of the Sanfranciscan Plate (the Carrancas Thrust System). Three large structures transported to the E-NE and coeval to high-pressure metamorphism at ca. 610 Ma make up the eastern sector of this nappe system. The upper Pouso Alto Nappe and associated klippen is composed of pelitic granulites, while the Liberdade Nappe is dominantly pelitic and has retro-eclogite slices derived from tholeiitic basalts of Late Criogenian age. The lower Andrelândia Nappe, with 2400 m minimum apparent thickness, is divided into three formations: the basal Rio Capivari Schist, dominated by metapelites, the Santo Antonio Schist metawackes, an Ediacarean Neoproterozoic flysch having as a source-area a juvenile magmatic arc, and the upper schist-quartzite sequence of the Serra da Boa Vista Schist.

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