Emplacement and deformation of the Cachoeirinha pluton (Borborema province, NE Brazil) inferred through petrostructural studies: Constraints on regional strain fields

Neves, Sérgio P.; Mariano, Gorki; Beltrão, Breno Augusto; Correia, Paulo B.

doi:10.1016/j.jsames.2005.04.004

Cited by 17 publications

(17 citation statements)

References 54 publications

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“…Therefore, these data allow the timing of this tectonic phase of the Brasiliano orogeny to be broadly constrained to the time span 630-600 Ma. The 587 ± 8 Ma and 573 ± 4 Ma ages of the Cachoeirinha pluton and Cabanas granite, respectively, are consistent with field relationship and internal structures in these intrusions, which suggest that the Cachoeirinha pluton is older than the Cabanas granite (Neves et al, 2005). The lack of large mylonitic zones in the Cachoeirinha pluton and its NNE-trending orientation indicate that it was not intensely affected by strike-slip-related deformation.…”

Section: Brasiliano-age Eventssupporting

confidence: 61%

“…Dextral and sinistral shear zones are consistently oriented NNE and ENE, respectively. These observations, in association with an AMS survey, are evidence that intrusion of the Cachoeirinha pluton occurred during bulk NW-SE shortening, with zones of non-coaxial shear developing locally (Neves et al, 2005).…”

Section: Study Areasupporting

confidence: 59%

“…These are the first U-Pb zircon ages reported so far for this portion of the southern domain. Along with available structural information (Neves et al, , 2005, they provide well-constrained age limits for the main period of tectonic activity related to the Brasiliano orogeny and shed new light on the age of basement rocks underlying the study area. In addition, we compare our new data with recently published data pertaining to north of the EPSZ (Brito Neves et al, 2001;Neves et al, 2006) to evaluate possible correlations between the central and southern domains.…”

Section: Introductionmentioning

confidence: 99%

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U–Pb ages of plutonic and metaplutonic rocks in southern Borborema Province (NE Brazil): Timing of Brasiliano deformation and magmatism

Neves

Bruguier

Bosch

et al. 2008

Journal of South American Earth Sciences

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Section: Brasiliano-age Eventssupporting

confidence: 61%

Section: Study Areasupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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U–Pb ages of plutonic and metaplutonic rocks in southern Borborema Province (NE Brazil): Timing of Brasiliano deformation and magmatism

Neves

Bruguier

Bosch

et al. 2008

Journal of South American Earth Sciences

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“…De acordo com a metodologia aplicada por Archanjo et al (2002), Neves et al (2005), Mariano et al (2009) e Davis et al (2010, neste estudo foram coletados em cada estação de dois a três testemunhos cilíndricos com comprimento entre INTRODUÇÃO A Anisotropia de Susceptibilidade Magnética (ASM) tem sido empregada para obter informação dos alinhamentos dos grãos minerais, mesmo para rochas que são consideradas visualmente isotrópicas (Tarling e Hrouda, 1993;Borradaile e Henry, 1997;Bouchez, 1997). Na presença de um campo magnético, todas as substâncias naturais são magnetizáveis, embora com intensidades e orientações diferentes.…”

Section: Anisotropia De Susceptibilidade Magnética (Asm)unclassified

“…localizado no domínio Sul da Província Borborema (Figura 1). Devido à existência local de apenas foliações magmáticas no PC, foi utilizada a técnica de ASM para obtenção das foliações e lineações magnéticas (Borradaile e Henry, 1997;Neves et al, 2005;Mariano et al, 2009;Davis et al, 2010;Borradaile e Jackson, 2010). Associado à ASM, foi realizado no PC o levantamento magnetométrico, tratando-se de uma aplicação inédita destas ferramentas no modelamento de corpos ígneos.…”

Section: Anisotropia De Susceptibilidade Magnética (Asm)unclassified

Modelo de alojamento do Plúton Cupira, Província Borborema (NE Brasil)

Miranda

Mariano

Correia

2016

Geol. USP. Sér. Cient.

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Recebido em 8 de abril de 2015; aceito em 25 de maio de 2016Resumo O Plúton Cupira está localizado no Domínio Sul da Província Borborema, possui área aflorante de aproximadamente 300 km 2 e forma ovalada com leve alongamento na direção E-W. Com objetivo de determinar o modelo de alojamento do plúton e os alinhamentos magnético-estruturais, foi realizada a integração inédita de estudos de anisotropia de suscetibilidade magnética (ASM) e magnetometria. Os dados de ASM mostram que a susceptibilidade total apresenta variação de 0,105x10 -3 SI a 34,618x10 -3 SI, indicando caráter ferromagnético. O grau de anisotropia varia de 1,06 a 1,272 e apresenta correlação positiva com a susceptibilidade total. O parâmetro de forma varia de -0,802 a 0,897, com preponderância de elipsoides oblatos sobre prolatos, refletindo trama magnética planar. A maioria das lineações magnéticas possuem direção NE-SW, com caimentos suaves a fortes para NE e para SW. A foliação magnética varia de NE a NNE, com mergulhos moderados a fortes (30° a 86°). A porção central do corpo tem foliações magnéticas e magmáticas essencialmente concêntricas, com mergulhos fortes para o centro do plúton, associadas à lineações com caimento forte, sugerindo ser a zona de alimentação magmática. Os alinhamentos magnéticos reforçam as direções estruturais evidenciadas pela ASM. Estes dados favorecem a proposição de modelo de alojamento do Plúton Cupira a partir de uma zona de alimentação magmática central, com fluxo do magma distribuído de forma concêntrica, com geometria de intrusão similar a um lopólito.Palavras-chave: Anisotropia de Susceptibilidade Magnética (ASM); Foliação magnética; Lineação magnética; Magnetometria; Província Borborema. AbstractThe Cupira pluton, located in the southern domain of the Borborema province in the Garanhuns subdomain, crops out for approximately 300 km 2 . It is oval in shape and is slightly elongated in the E-W direction. In order to establish an emplacement model and to obtain structural-magnetic alignments, an integration of Anisotropy of Magnetic Susceptibility (AMS) and magnetometry data was carried out. AMS data show that total susceptibility ranges from 0.105x10 -3 SI to 34.618x10 -3 SI, indicating a ferromagnetic character. The degree of anisotropy varies from 1.06 to 1.272, with positive correlation with the total susceptibility. The shape parameter varies from -0.802 to 0.897, with predominance of oblate over prolate ellipsoids, reflecting a dominantly planar magnetic fabric. The magnetic lineations are distributed mainly in the NE-SW direction, with gentle to strong plunges to NE and SW. The magnetic foliation trends vary from NE to NNE, with moderate to strong dips (30° to 86°). The central portion of the pluton has concentric inward dipping foliations associated with strongly plunging lineations, suggesting a central magmatic conduct. The magnetic alignments corroborate with the structural trends obtained by AMS. These data favor the proposition of an emplacement model for the Cupira Puton from a central magmatic con...

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Ediacaran Águas Belas pluton, Northeastern Brazil: Evidence on age, emplacement and magma sources during Gondwana amalgamation

et al. 2010

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Emplacement and deformation of the Cachoeirinha pluton (Borborema province, NE Brazil) inferred through petrostructural studies: Constraints on regional strain fields

Cited by 17 publications

References 54 publications

U–Pb ages of plutonic and metaplutonic rocks in southern Borborema Province (NE Brazil): Timing of Brasiliano deformation and magmatism

U–Pb ages of plutonic and metaplutonic rocks in southern Borborema Province (NE Brazil): Timing of Brasiliano deformation and magmatism

Modelo de alojamento do Plúton Cupira, Província Borborema (NE Brasil)

Ediacaran Águas Belas pluton, Northeastern Brazil: Evidence on age, emplacement and magma sources during Gondwana amalgamation

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