Quartz textural analysis from an anastomosing shear zone system: Implications for the tectonic evolution of the Ribeira belt, Brazil

Conte, Thailli; Cavalcante, Carolina; Lagoeiro, Leonardo Evangelista; Fossen, Haakon; Silveira, Camila

doi:10.1016/j.jsames.2020.102750

Cited by 13 publications

(7 citation statements)

References 56 publications

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“…In this case, no SGR features with BLG superimposition were observed. Conte et al (2020) observed rocks recrystallized by bulging in the southern portion of the Lancinha Shear Zone and by subgrain rotation and GBM in the northern portion of the zone. The processes of recrystallization by bulging or subgrain rotation are considered the main recrystallization mechanisms.…”

Section: Second Migmatizaton Phasementioning

confidence: 87%

“…Protomylonitic to ultramylonitic migmatites exhibit oligoclase or andesine and microcline with new grain features and quartz formed by GBM, suggesting temperature of 500°C (Stipp et al 2002). Quartz also occurs as new grains by subgrain rotation (temperatures of 400-500°C, Stipp et al 2002) and bulging at temperatures of approximately 280-400°C Handy 1991, Stipp et al 2002), probably due to exhumation effects and retrograde metamorphism that occurred in the final phase of deformation of the Atuba Complex and may be related to the Curitiba Shear Zone (Gonçalves 2012, Cabrita 2015, Conte et al 2020. The mylonite migmatites show dislocation creep mechanisms.…”

Section: Second Migmatizaton Phasementioning

confidence: 99%

“…Transpressional, progressive, and partitioned deformation was suggested by Ebert and Hasui (1998) for the Ribeira Belt; by Dehler et al (2007) in the Serra do Azeite Shear Zone; by Faleiros et al (2016) in four deformation phases (D3-D6) of the southern Ribeira Belt; by Fossen et al (2019) for the entire Ribeira Belt; by Ribeiro et al (2019) along the Taxaquara Shear Zone; by Baldin et al (2020aBaldin et al ( , 2020b in the Atuba Complex; and by Conte et al (2020) in the Lancinha Shear Zone. The rocks noted in this deformation phase may have ages between 620 and 600 Ma (Siga Junior et al 2007).…”

Section: S Nmentioning

confidence: 99%

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Advancing geological and structural understanding of the Atuba Complex: a study in the Curitiba Terrane of the Southern Ribeira Belt, Southern Brazil

Tissi Baldin,

Salamuni,

Lagoeiro

et al. 2024

Braz. J. Geol.

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The Atuba Complex occurs in the eastern region of Paraná State, located in the Southern Ribeira Belt. It is comprised of the Curitiba Terrane, northward of the Luís Alves Terrane, and southward of the Apiaí Terrane. This research was carried out by means of detailed petrography, microtectonics, and brittle and ductile structural analysis. The Atuba Complex is composed of migmatites, felsic granulites, granitoids, quartzites, phyllonites, schists, amphibolites, and cataclasites. The lithotypes are cut by diabase or gabbro dikes, lamprophyre dikes, pseudotachylites, and quartz, epidote, carbonate, or chlorite veins. The migmatites are characterized by two migmatization phases, the first composed of tonalitic leucosomes and the second formed by granitic leucosomes. The stromatic and mylonitized migmatites suggest dislocation creep mechanisms and dynamic recrystallization processes, mainly in quartz and feldspars. During the initial phase, melting reactions took place through dehydration, while in the subsequent phase, melting was facilitated by the presence of water-fluxed. The Atuba Complex comprises two foliations, S n-1 (D n-1 phase) and S n (D n phase). The S n-1 surface (compositional banding) presents a ductile and anastomosed aspect with an N45W/55NE attitude, whereas the S n mylonitic foliation is defined by the presence of mineral flattening or stretching and by the orientation of amphibole and biotite shapes, with a maximum plane of N45E/85NW. The observed faults and fractures strike in the NE-SW and NW-SE main directions. The paleostress study provided the recognition of a NE-SW sigma 1 associated with a NW-SE-striking sigma 3 for the left-lateral strike-slip faults and an E-W compressive SHMAX and an N-S distensive SHMIN for the right-lateral strike-slip faults.

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Section: Second Migmatizaton Phasementioning

confidence: 87%

Section: Second Migmatizaton Phasementioning

confidence: 99%

Section: S Nmentioning

confidence: 99%

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Advancing geological and structural understanding of the Atuba Complex: a study in the Curitiba Terrane of the Southern Ribeira Belt, Southern Brazil

Tissi Baldin,

Salamuni,

Lagoeiro

et al. 2024

Braz. J. Geol.

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“…Behrmann and Mainprice, 1987;Prior et al, 1999;Maitland and Sitzman, 2007;Mariani et al, 2008. Chen andThomson, 2010;Kilian et al, 2011;Oliot et al, 2014;Platt, 2015;Desbois et al, 2016;Vrolijk et al, 2018;Cavalcante et al, 2018;Goswami et al, 2018;Scheiber et al, 2019;Bella et al, 2019;Ribeiro et al, 2019;Ault, 2020;Conte et al, 2020).…”

Section: Submicroscopic Sem-tem-ebsd Analysisunclassified

Geological-structural mapping and geocronology of shear zones: A methodological proposal

Ortega¹,

Isaza²,

Herrera³

et al. 2021

Bol.geol.

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The deformation registered in rocks in the field can be characterized based on the structures preserved in outcrops, which can related be to wide discontinuity zones named faults and shear zones. The geological-structural mapping and the geochronology of these tectonic structures are a topic of great interest not only for tectonic modeling but also for reconstruction of the geological evolution of the national territory. The methodology suggest for the analysis of faults and shear zones is based on eight steps, including: 1) definition of the geological context in which the structure was developed; 2) photointerpretation, image geoprocessing, and geological-structural mapping of the structural and lithological characteristics of the faults and shear zones; 3) petrographic analysis of field-oriented samples; 4) quantification of strain orientation and geometry through 3D finite strain analyses and quantification of non-coaxiliaty of deformation through vorticity analyses; 5) SEM-TEM-EBSD microanalysis; 6) quantification of the P-T conditions of deformation through phase-equilibria modeling or conventional geothermobarometry; 7) dating of syn-kinematic minerals phases and mylonitic rocks through Ar-Ar analyses, in order to determine the reactivation and deformation ages of the structure, respectively, as well as the implementation of the U-Pb technique in syn-kinematic calcite crystals developed in the fault planes; and 8) dating of geological elements adjacent to the structure, such as syn-kinematic intrusive bodies associated with the deformation event using zircon U-Pb dating, rocks hydrothermally altered through Ar-Ar method, and zircon and apatite fission-tracks dating of the blocks adjacent to the faults for determining exhumation ages.

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“…The SEM-EBSD along with detailed microstructural characterization is a powerful tool for addressing the rheology of the crust (dynamic processes in Earth's crust), as it allows for a complete evaluation of crystallographic orientations of rock-forming minerals. Therefore, it has been widely used to investigate the way quartz deforms in shear zones at different temperatures (e.g., Kilian et al, 2011;Lee et al, 2020;Conte et al, 2020), and has been fundamental to the investigation of crystal-plastic deformation recorded in mylonitic rocks.…”

mentioning

confidence: 99%

TitaniQ temperatures and textural analysis as a record of the deformation history in a major continental shear zone system, Borborema Province, Brazil

Cavalcante

Costa²,

Lagoeiro³

et al. 2022

Tectonophysics

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Quartz textural analysis from an anastomosing shear zone system: Implications for the tectonic evolution of the Ribeira belt, Brazil

Cited by 13 publications

References 56 publications

Advancing geological and structural understanding of the Atuba Complex: a study in the Curitiba Terrane of the Southern Ribeira Belt, Southern Brazil

Advancing geological and structural understanding of the Atuba Complex: a study in the Curitiba Terrane of the Southern Ribeira Belt, Southern Brazil

Geological-structural mapping and geocronology of shear zones: A methodological proposal

TitaniQ temperatures and textural analysis as a record of the deformation history in a major continental shear zone system, Borborema Province, Brazil

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