A radiometric age of deformed granitic rocks in north-central New Brunswick

Fyffe, L. R.; Irrinki, R. R.; Cormier, R. F.

doi:10.1139/e77-143

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…The metaporphyry is considered to be a less deformed equivalent of the quartz augen schists and grades laterally into rocks with a coarse crystalline, semiporphyritic texture. This section of the metaporphyry has been described as part of the pretectonic suite of metagranitoids, radiometrically dated by Rb/Sr method at about 480 Ma (Fyffe et al, 1977). The metagranitoids have no contact aureole of any significance and are enveloped by compositionally similar metavolcanics and metavolcaniclastics.…”

Section: Metaporphyry (Unit 6) and Metagranitoid (Unit 7)mentioning

confidence: 99%

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Structure and evolution of the Heath Steele base metal sulfide orebodies, Bathurst Camp, New Brunswick, Canada

Roo¹,

Williams²,

Moreton³

1991

Economic Geology

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A structural analysis of the base metal sulfide deposits at the Heath Steele mines, northern New Brunswick, is presented. The structural similarity of the deposits is defined and their relationships to one another discussed.The deposits are spatially associated with Ordovician sedimentary rocks, which are situated in an igneous rock complex comprising felsic and basic volcanics, volcaniclastics, and intrusives. The complex has been subjected to low-grade metamorphism and five generations of deformation (D1-Ds). The first two generations of deformation (D1 and D2) are represented by transposition foliations (S1 and S2). The present attitude of the S2 foliation is a result of recumbent folding (D3) and two generations of open folds with vertical axial planar cleavages striking northwest (S4 foliation) and northeast (S5 foliation). The S1 foliation is axial planar to conical F1 folds. Regionally, such folds have been associated with thrusting (D1) along the earliest recognized layering (So foliation). Vein swarms illustrate the local importance of solute mass transfer during this event, at the Heath Steele mines culminating in fracture-controlled alteration along a brittle-ductile deformation (D1) shear zone near the sulfide deposits, and development of metasomatic breccia in the sulfide deposits.Overall, the deposits occur along the So foliation, the contact between augen schists and the metasedimentary rocks, but massive sulfides are concentrated in F1 fold closures, forming pods and slabs parallel to the S1 foliation. This concentration reflects either mobilization of preexisting sulfides (during D1) or deposit formation by mineralization during D1. If the contact (in So) is nontectonic, a stratigraphic control on the location of the deposits is indicated and their association with iron-formation argues for a syngenetic origin. Conclusive evidence for these models has been obliterated by the intense deformation and solution transfer.

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Section: Metaporphyry (Unit 6) and Metagranitoid (Unit 7)mentioning

confidence: 99%

“…The metagranitoids have no contact aureole of any significance and are enveloped by compositionally similar metavolcanics and metavolcaniclastics. These relationships suggest shallow intrusion and consanguineous volcanism (Fyffe et al, 1977(Fyffe et al, , 1981; van Staal, •87).…”

Section: Metaporphyry (Unit 6) and Metagranitoid (Unit 7)mentioning

confidence: 99%

Structure and evolution of the Heath Steele base metal sulfide orebodies, Bathurst Camp, New Brunswick, Canada

Roo¹,

Williams²,

Moreton³

1991

Economic Geology

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Synthesis of Palaeozoic deformational events and terrane accretion in the Canadian Appalachians

Keppie¹

1993

Geol Rundsch

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The significance of radiometric ages from the Gulquac Lake area of New Brunswick

Fyffe¹,

Cormier²

1979

Can. J. Earth Sci.

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Radiometric dating of igneous rocks in the Gulquac Lake area of west-central New Brunswick confirms that rhyolitic volcanism and shallow granitic intrusive activity were closely associated in time. Rb–Sr whole rock isochrons yield an age of 409 ± 35 Ma for the volcanic rocks and 409 ± 25 Ma from the intrusive rocks (λ = 1.42 × 10−11 year−1). Structural relationships in the area show that emplacement of the granite coincided with an episode of intense faulting and uplift of sillimanite-grade Cambro–Ordovician terrain.The combined radiometric data indicate a minimum age for the Silurian–Devonian boundary of 409 ± 20 Ma.

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A radiometric age of deformed granitic rocks in north-central New Brunswick

Cited by 5 publications

References 2 publications

Structure and evolution of the Heath Steele base metal sulfide orebodies, Bathurst Camp, New Brunswick, Canada

Structure and evolution of the Heath Steele base metal sulfide orebodies, Bathurst Camp, New Brunswick, Canada

Synthesis of Palaeozoic deformational events and terrane accretion in the Canadian Appalachians

The significance of radiometric ages from the Gulquac Lake area of New Brunswick

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