Elvo Fassbinder

Universidade Federal do Paraná

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Carlos Eduardo de Mesquita Barros

Universidade Federal do Paraná

Rômulo Machado

Universidade de São Paulo

Alberto Pio Fiori

Universidade Federal do Paraná

Nolan Maia Dehler

Petrobras (Brazil)

Paulo Vasconcelos

University of Queensland

Haakon Fossen

University of Bergen

Aléxis Rosa Nummer

Universidade Federal Rural do Rio de Janeiro

Adriana P. do Nascimento

Universidade Federal do Ceará

Clotilde Zai

Universidade Federal do Paraná

Heloísa Rodrigues de Souza Dehler

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Universidade Federal do Paraná

Universidade de São Paulo

Instituto de Geociencias

National Council for Scientific and Technological Development

Universidade do Estado de Minas Gerais

University of Queensland

Environmental Earth Sciences

California Institute of Technology

Universidade Federal de Pernambuco

University of California, Berkeley

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Kinematics, Recrystallization Mechanisms and 40ar-39ar Dating of the Cal Shear Zone, Curitiba Microplate, Central Mantiqueira Province, Southern Brazil

SSRN Electronic Journal (2022)

Carlos Eduardo de Mesquita Barros Elvo Fassbinder Alberto Pio Fiori Paulo Vasconcelos Nicole Favoreto de Souza Bueno

Mylonites and ultramylonites resultant from plastic deformation of quartz-feldspathic rocks and granites occur for hundreds of meters along the Cal shear zone, located close to the western margin of the Curitiba Microplate, in the Central Mantiqueira province (southern Brazil). A conspicuous N30-40E/90 banding resulted from the intercalation of quartz-feldspathic mylonite and leucogranitic mylonite layers. N30/15 stretching lineation, sigmoidal structures, S/C/C’ surfaces, mica fish texture, and secondary foliation in quartz ribbons indicate sinistral sense of shear. Quartz recrystallization controlled by grain boundary migration and subgrain rotation suggests that temperatures of the order of 500 ºC were reached during dynamic metamorphism. These temperatures are also attested by generalized feldspar recrystallization. The presence of quartz veins suggests that pressure dissolution may have been a subordinated recrystallization mechanism. 40 Ar- 39 Ar dating of an ultramylonite (whole-rock) sample and biotite separates yielded the age of 608 Ma for the Cal strike-slip shear zone. A thermo-tectonic phase attributed to reactivation during dextral, brittle-plastic transcurrent shearing occurred later, at ca. 553 Ma.

Mylonite

Lineation

Recrystallization (geology)

Shearing (physics)

10.2139/ssrn.4159902

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Orogenic-parallel tangential shearing in convergent orogens: transient strain accommodating parallel flow during transpression and extrusion in the Paraíba do Sul belt, southeastern Brazil

Nolan Maia Dehler Rômulo Machado Heloísa Rodrigues de Souza Dehler Aléxis Rosa Nummer Elvo Fassbinder

Transpression

Shearing (physics)

Strain partitioning