Rudolph Allard Johannes Trouw

Universidade Federal do Rio de Janeiro

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Cees W. Passchier

Johannes Gutenberg University Mainz

André Ribeiro

Universidade Federal do Rio de Janeiro

Renata da Silva Schmitt

Universidade Federal do Rio de Janeiro

Rodrigo Vinagre

Universidade Federal do Rio de Janeiro

Rodrigo Peternel

Universidade do Estado do Rio de Janeiro

Júlio Cézar Mendes

Universidade Federal do Rio de Janeiro

Dirk J. Wiersma

Elton Luiz Dantas

Instituto de Geociencias

Rodrigo S. Marimon

Universidade Federal do Rio de Janeiro

Patrícia Duffles

Universidade Federal Rural do Rio de Janeiro

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Universidade Federal do Rio de Janeiro

Instituto de Geociencias

Johannes Gutenberg University Mainz

Büro Vatter (Switzerland)

Universidade do Estado do Rio de Janeiro

Universidade de São Paulo

National Council for Scientific and Technological Development

Petrobras (Brazil)

Brazilian Institute of Geography and Statistics

Universidade Brasil

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Superposition of structures in the interference zone between the southern Brasília belt and the central Ribeira belt in the region SW of Itajubá (MG), SE Brazil

Brazilian Journal of Geology (2016)

Rodrigo Vinagre Rudolph Allard Johannes Trouw Hugo Kussama Rodrigo Peternel Júlio Cézar Mendes

ABSTRACT: The study area is localized in the Socorro nappe, part of the southern Brasília belt, with a minor part in the Embu terrane, part of the central Ribeira belt. Three phases of deformation were detected, Dn-1, Dn and Dn+1. Sn-1 seems to be generally transposed into Sn, but in the northwestern part it is well preserved, dipping about 60º to W and SW, with a stretching and/or mineral lineation plunging down dip. The main foliation in most of the area is Sn, dipping about 70º to SSE. Dn folds are tight to isoclinal, with axes that plunge about 40º to SW. Quartz-feldspathic segregation veins are folded by Dn. The structures related to Dn-1 and Dn are cut and modified by four important shear zones ascribed to deformation phase Dn+1. Two samples of a granite that is elongated along the Caxambu shear zone, and also cut by it, were dated. One yielded a crystallization age of 575 ± 5 Ma, and the other one, from the shear zone, an age of 567 ± 8 Ma, interpreted either as representing the age of movement along the Caxambu shear zone, or as metamorphic growth.

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Foliation (geology)

10.1590/2317-4889201620160034

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Citations (15)

Medium-Grade Mylonites

Springer eBooks (2009)

Rudolph Allard Johannes Trouw Cees W. Passchier Dirk J. Wiersma

Mylonite

10.1007/978-3-642-03608-8_5

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Citations (2)

Constraining timing and P-T conditions of continental collision and late overprinting in the Southern Brasília Orogen (SE-Brazil): U-Pb zircon ages and geothermobarometry of the Andrelândia Nappe System

Precambrian Research (2017)

Mariana Barroso Coelho Rudolph Allard Johannes Trouw Carlos E. Ganade Rodrigo Vinagre Júlio Cézar Mendes

Orogeny

continental collision

Geothermobarometry

Basement

10.1016/j.precamres.2017.02.001

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Citations (64)

The geometry of folded tectonic shear sense indicators

Journal of Structural Geology (1999)

Ben Goscombe Rudolph Allard Johannes Trouw

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10.1016/s0191-8141(98)00092-3

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Citations (30)

Evolução tectônica da Zona de Cisalhamento Caxambu, MG

Revista Brasileira de Geociências (2007)

Camilo Correia Trouw Felipe Fernandes Fonseca de Medeiros Rudolph Allard Johannes Trouw

The NE-SW trending Caxambu Shear Zone (CSZ) is an example of a group of similar shear zones that crop out in southern Minas Gerais and adjacent Rio de Janeiro states. They represent the final stage of the Neoproterozoic tectonic activity related to the Brasiliano Orogeny in this region. It is a dextral shear zone with predominantly ductile behavior. The CSZ affects metaigneous and metasedimentary rocks of a Paleoproterozoic basement with its Neoproterozoic cover denominated Andrelândia Megasequence (AMS). Six mapping units were recognized: orthogneiss (basement), banded biotite gneiss (AMS), quartzite (AMS), biotite schist (AMS), garnet muscovite schist (AMS) and a plug of alkaline intrusive rocks of probable Cretaceous age. Two groups of structures were recognized in the area. The first group, attributed to deformation phase DB, related to the Brasília Belt, includes the main foliation and associated lineation and extensive nappe structures with tectonic transport top to the east. The second group, related to the Ribeira Belt and labeled DR, includes the Caxambu Shear Zone. The CSZ is more then 100 km long and about 2.5 km wide; its dextral horizontal displacement in the studied area is estimated at about 14.5 km. Including published estimates from adjacent areas an average value of 17.6 km is obtained, resulting in an approximate average value for γ of simple shear of seven. Associated to the CSZ mylonitic rocks were formed containing the following shear sense indicators: mica fish and other minerals with similar shape and asymmetry, oblique foliation, S-C structures, mantled porphyroclasts and asymmetric microfolds. The metamorphic conditions during mylonitization are estimated at lower amphibolite facies.

Mylonite

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10.25249/0375-7536.2007374767776

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Citations (12)

Thermobarometric and geochronologic constraints on the tectonic evolution of the southern Brasília Fold Belt, Brazil

AGU Spring Meeting Abstracts (2006)

B. L. Reno Mark J. F. Brown Philip M. Piccoli Rudolph Allard Johannes Trouw K. Kobayashi

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Tectonic Implications of Ultrahigh-Temperature and High-Pressure Granulite Metamorphism in the Neoproterozoic Brasiliano Belts of SE Brazil