Metamorphic evolution of metasedimentary rocks of the Feira Nova region: Tectonic implications for the Brasiliano Orogeny in eastern Borborema Province, Northeast Brazil

Silva, Valdielly L.; Pereira, Salviano; Bustamante, Andrés; Neves, Sérgio P.

doi:10.1016/j.jsames.2020.102590

Cited by 5 publications

(4 citation statements)

References 63 publications

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“…In this work, structures prior to S 2 are limited to a local isoclinally folded foliation present in basement rocks (Fig. 3B) and seen petrographically in both basement and Neoproterozoic supracrustal units (Silva et al 2020). Therefore, this foliation also belongs to the contractional regime and the mentioned dikes may actually be younger than what Accioly (2000) proposed, being related to the late stages of the Brasiliano Orogeny.…”

Section: Discussionsupporting

confidence: 45%

“…3D). This previous foliation is also observed petrographically in micaschist and paragneiss, being defined by rare kink biotite porphyroblasts and biotite inclusions in garnet that are orthogonal or oblique to S 2 (Silva et al 2020). Stretching mineral lineations have dominantly low plunge and medium to high rake and are marked by quartz, feldspar, sillimanite, amphibole, and pressure shadows around garnet (Fig.…”

Section: Thrust Tectonicsmentioning

confidence: 54%

“…4) suggest that temperature conditions were high during thrusting, remained high during strike-slip deformation (e.g., chessboard extinction in quartz), and then migrated to lower ones (e.g., bulging recrystallization in quartz). Using conventional garnet-biotite geothermometer, garnet-Al 2 SiO 5 -quartz-plagioclase (GASP) geobarometer, and X-ray maps, Silva et al (2020) estimated metamorphic peak conditions of 650-760°C and ∼0.6-0.9 GPa for the Surubim Complex in the study area, coeval with the development of flat-lying foliation and local anatexis. Garnet rims indicated 590-520°C and 0.4-0.3 GPa, which was interpreted as exhumation with low erosional and cooling rates.…”

Section: Discussionmentioning

confidence: 99%

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Transition from contractional to transpressive tectonics: evidence from the Feira Nova Region, Rio Capibaribe Domain, Borborema Province, NE Brazil

Silva

Neves

2021

Braz. J. Geol.

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Differences in tectonic style and kinematics in orogenic belts can result from either multiphase or progressive deformation. In eastern Borborema Province, a regional shallow dipping foliation is multiply folded and crosscut by transcurrent shear zones. Here, we investigate if these fabrics resulted from diachronous deformational events or from a single-phase progressive deformation. The study area, the Feira Nova region, mostly comprises metasedimentary rocks from the Surubim Complex, and is bounded by the NE-trending sinistral Gloria do Goitá (GGSZ) and the sinistral contractional Paudalho (PSZ) shear zones, which separate it from Paleoproterozoic basement rocks. Structures can be grouped into a contractional and a transpressional stage, both related to the Brasiliano Orogeny. The contraction-related structures are represented by a gently dipping foliation (S 2 ) related to a top-to-the-NW tectonic transport. The contact between the metasedimentary and basement rocks is parallel to S 2 , indicating the fabrics in both lithotypes are of Brasiliano age, with strain localization having produced the PSZ. NW-verging macroscopic folds are consistent with this regime. The following transpression generated steep mylonitic foliation (S 3 ) mainly along the GGSZ, and caused refolding. The data here presented are consistent with a progressive deformation history comprising a gradual transition from contraction to transpression.

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Section: Discussionsupporting

confidence: 45%

Section: Thrust Tectonicsmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 99%

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Transition from contractional to transpressive tectonics: evidence from the Feira Nova Region, Rio Capibaribe Domain, Borborema Province, NE Brazil

Silva

Neves

2021

Braz. J. Geol.

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“…Detrital zircon ages are based on compilations by Neves[38] and Caxito et al[71]. P − T estimates are from[45,48,60,[72][73][74][75][76][77]. Transport directions are from[44,46,48,50,51,54,78].…”

mentioning

confidence: 99%

The Borborema Strike-Slip Shear Zone System (NE Brazil): Large-Scale Intracontinental Strain Localization in a Heterogeneous Plate

et al. 2021

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Large-scale strike-slip faults are fundamental tectonic elements of the continental lithosphere. They constitute plate boundaries (continental transforms), separate terranes with contrasting geological histories within accretionary orogens, or accommodate heterogeneous deformation in intracontinental settings. In ancient orogens, where deeper levels of the crust are exposed, these faults are expressed as shear zones materialized by up to tens of km-wide mylonitic belts. The Borborema shear zone system in northeastern Brazil is one of the largest and best-exposed intracontinental strike-slip shear zone systems in the world, cropping out over 250,000 km2. Here, we review its main geophysical, structural, petrologic, and geochronologic characteristics and discuss the factors controlling its development. This complex continental scale shear zone system is composed of a set of NE- to NNE-trending dextral shear zones from which there are two major E-trending dextral shear zones with horse-tail terminations into the transpressional belt branch, as well as several smaller E-trending dextral and NE-trending dextral and sinistral shear zones. The major shear zones are marked by extensive linear or curvilinear magnetic gradients, implying their continuation at depth. The major shear zones are materialized by migmatite to amphibolite-facies mylonites, but the entire system shows evidence of late deformation at lower temperatures. The system developed during the late stages of the Neoproterozoic Brasiliano (Pan-African) orogeny (mainly from 590 to 560 Ma), postdating by more than 20 Ma the main stage of contractional deformation. Localization of strike-slip shearing in this intraplate setting was controlled by rheological contrasts between blocks with distinct Paleoproterozoic histories, the presence of preorogenic Neoproterozoic rifts, the craton geometry, and zones of enhanced magmatic activity, highlighting the importance of rheological heterogeneity in controlling shear zone nucleation and evolution.

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How many oceans closed during the Brasiliano Cycle in northeastern Brazil? Implications for the amalgamation of western Gondwana

Neves

2024

Earth-Science Reviews

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Metamorphic evolution of metasedimentary rocks of the Feira Nova region: Tectonic implications for the Brasiliano Orogeny in eastern Borborema Province, Northeast Brazil

Cited by 5 publications

References 63 publications

Transition from contractional to transpressive tectonics: evidence from the Feira Nova Region, Rio Capibaribe Domain, Borborema Province, NE Brazil

Transition from contractional to transpressive tectonics: evidence from the Feira Nova Region, Rio Capibaribe Domain, Borborema Province, NE Brazil

The Borborema Strike-Slip Shear Zone System (NE Brazil): Large-Scale Intracontinental Strain Localization in a Heterogeneous Plate

How many oceans closed during the Brasiliano Cycle in northeastern Brazil? Implications for the amalgamation of western Gondwana

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