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TitreTiming of metamorphism of the Tomogonops Formation, Bathurst Mining Camp, New Brunswick and implications for regional structural development
AuteurLandry, M; Kellett, D A; Rogers, N
SourcePDAC-SEG Student Minerals Colloquium, PDAC International Convention, abstracts; 2014 p. 1
Séries alt.Secteur des sciences de la Terre, Contribution externe 20130514
RéunionPDAC-SEG Student Minerals Colloquium, PDAC International Convention; Toronto; CA; mars 2-6, 2014
Documentpublication en série
Mediaen ligne; numérique
SNRC21O/01; 21O/02SE; 21O/02NE; 21O/07SE; 21O/07NE; 21O/08; 21O/09; 21O/10SE; 21O/10NE; 21O/15SE; 21O/16SE; 21O/16SW; 21P/03SW; 21P/03NW; 21P/04; 21P/05; 21P/06SW; 21P/06NW; 21P/11SW; 21P/11NW; 21P/12; 21P/13SE; 21P/13SW; 21P/14SW
Lat/Long OENS-66.6667 -65.5000 47.7500 47.0000
Sujetsmétamorphisme; analyses structurales; interpretations structurelles; roches sédimentaires; silstones; schistes; grauwackes; conglomérats; déformation; foliation; datation argon-argon; datations argon-argon; Camp minier de Bathurst; Formation de Tomogonops ; stratigraphie; géologie structurale; géophysique
ProgrammeÉtude des gîtes de sulfures massifs volcaniques, Initiative géoscientifique ciblée (IGC-4)
LiensOnline - En ligne
Résumé(disponible en anglais seulement)

The Tomogonops Formation comprises a coarsening-upward sequence of grey, bedded, calcareous siltstone, shale, wacke and conglomerate that forms the uppermost part of the Tetagouche Group in the Bathurst Mining Camp (BMC), northeastern New Brunswick. A recent 3D geophysical inversion produced for NRCan's TGI-4 VMS Project suggests that the Tomogonops Formation overlies a large ophiolitic complex and that together these units structurally truncate several phases of deformation observed within the BMC. However, previous studies indicate that the Tomogonops Formation has the same structural development as the rest of the BMC. Thin section analysis and 40Ar/39Ar radiometric dating of white mica are used to compare the timing of metamorphism and deformation of the Tomogonops with the rest of the BMC. Seven felsic metavolcanic and associated sedimentary rock samples from different areas of the BMC show greenschist-facies metamorphic grade and evidence of S1, S2 and S3 foliations. Preliminary 40Ar/39Ar age results of metamorphic muscovite constrain the timing of metamorphism of these samples to between 455-425 Ma, consistent with the metamorphic history of the area. One sample yielded c. 405 Ma. Meanwhile, a low-grade metapelite from the Tomogonops Formation yielded a preliminary 40Ar/39Ar age for white mica of c. 420 Ma. A Tomogonops wacke containing detrital grains of muscovite yielded preliminary 40Ar/39Ar ages ranging between 470-460 Ma. Together, these data suggest the Tomogonops Formation is sourced from lower to middle Tetagouche Group or coeval rocks that were deposited after 460 Ma and subsequently metamorphosed at c. 420 Ma. The results obtained are providing significant constraints on the 3D geophysical inversion model.