... signature consistent with sediment derivation from late Cambrian plutons in the Bras d′Or terrane ( Chen et al. 1995 ). These data led to the interpretation of a basement-cover relationship between Bras d’Or and Aspy terranes, respectively ( Lin 1993 , 1995 ; Chen et al. 1995 ; Lin et al. 2007 ). Lin...

... ; Barr et al. 2018 ) in the Bras d’Or terrane ( Fig. 12 a ). The crystallization ages of 574.8 ± 4.2 and 576.9 ± 4.2 Ma for two Highland granite pluton samples (SMB19-261 and -262) overlap within error and indicate emplacement at ca. 575 Ma ( Figs. 10 b and 10 d ), at the same time as eruption...

...D. van Rooyen; S.M. Barr; C.E. White; M.A. Hamilton The northern Appalachian orogen preserves evidence of a complex history of amalgamation of terranes with both Laurentian and Gondwanan affinities. The Ganderian Bras d’Or terrane of central Cape Breton Island is not well represented elsewhere...

...B. D. Loncarevic; S. M. Barr; R. P. Raeside; C. E. Keen; F. Marillier Abstract The narrowest section of the Appalachian Orogen in Atlantic Canada (from Grenville-age basement in the west to the Avalon Terrane in the east) is preserved in Cape Breton Island, where components of four terranes display...

... (Blair River Inlier) in Cape Breton Island. Kellys Mountain is situated in the Bras d’Or terrane, which is located mainly in central Cape Breton Island between the Aspy terrane to the northwest and the Avalonian Mira terrane to the southeast ( Fig. 1 ) ( Barr and Raeside 1989 ). Fig. 1. Regional...

... has higher density and susceptibility than basement to the south, and hence the source bodies are interpreted as plutons emplaced along the boundary between Ganderian composite terranes to the north and the Ganderian Brookville – Bras d’Or terrane to the south. This interpretation suggests...

... and Bras d’Or terranes remains enigmatic, as is the apparent absence of effects of Devonian deformation and metamorphism in the older plutonic units. Ganderia, the central domain of the northern Appalachian orogen ( Fig. 1 inset), is a complex area of Neoproterozoic to Devonian rocks interpreted...

... tholeiites in mainland Nova Scotia, are critical to the understanding of the Early Palaeozoic evolution of the Appalachians. Figure 1. (a) Terrane map of the northern Appalachians modified after Keppie, Davis & Krogh (1998) . M = Mira terrane; B = Bras d’Or terrane; A Aspy terrane; BR = Blair...

... to the inboard Bras d'Or and Aspy terranes. Similar 18 O-depletion was noted for granitoid suites from the Caledonia terrane in New Brunswick ( Whalen et al., 1994 ) and the Avalon zone in Newfoundland ( Fryer et al., 1992 ), suggesting that 18 O-depletion might be a distinctive feature of these correlative...

... with the Bras d’Or terrane of Cape Breton Island (e.g., Williams 1979 ; Nance 1987 ; Murphy and Nance 1989 ; White and Barr 1996 ) on the basis of lithological similarities, including passive margin quartzite-carbonate rocks (George River Metamorphic Suite) corresponding to the Green Head Group, low...

... do Complexo Varginha. XXXIII Congo Bras. Geo!. Rio de Janeiro: An. v., pp. 2303-2304. OLIVEIRA, E. P. DE, LIMA, M. I. C. DE, CARMO, U. F. DO and WERNICK, E., (1982) The Archean granulite terrain from east B"ahia, Brazil. Rev. Bras. Geoc., v. 12, pp. 356-368. OrHMAN, D. B., POLVE, M. and ALLEGRE, c...

...Scott D. Samson; Sandra M. Barr; Chris E. White Abstract Nd isotopic data are presented for rock units in four terranes within the traditional Avalon Zone of southern New Brunswick. Initial ε Nd values for igneous rocks within the Caledonia terrane range from −1.6 to +4.6, whereas values...

... , O. , Jr. ; and Reis Neto , J. M. 2001 . Volcanism and stratigraphy of the Neoproterozoic Campo Alegre Basin, SC, Brazil . An. Acad. Bras. Cienc. 73 : 581 – 597 . Cogan , M. J. ; Nelson , K. D. ; Kidd , W. S. F. ; and Wu , C. 1998 . Shallow structure...

... they are separated by highland belts of the Bras d’Or terrane (Fig.  1 ). Hence, the latter areas are geographically more reasonable potential source areas, and Dallmeyer and Keppie ( 1993 ) reported 40 Ar/ 39 Ar plateau ages ranging from ca. 409 to 390 Ma for muscovite from quartz mica schist and argillaceous...

... of the Frenchvale Road metamorphic suite, one of several low-pressure, late Proterozoic inliers belonging to the Bras d’Or gneiss/metamorphic suite as defined by Raeside ( 1989 ) and Raeside and Barr, 1990 ) that crop out near the southeastern margin of the Bras d’Or terrane ( Fig. 1 , inset map). The Bras d’Or...

...J Duncan Keppie; D W Davis; T E Krogh Abstract Concordant U-Pb ages of detrital zircons in several Proterozoic units in the Avalon Composite Terrane of Nova Scotia, along with previously published data, indicate that deposition of low- and high-grade stratified units in the Cobequid Highlands...

... Paraná . In Congresso Brasileiro de Geologia, 30th (Recife). Soc. Bras. Geol., Anais 6 , 2594 – 2608 . Heilbron , M. & Machado , N ( 2003 ): Timing of terrane accretion in the Neoproterozoic–Eopaleozoic Ribeira orogen (SE Brazil) . Precamb. Res . 125 , 87 – 112...

...-Saint-Jean anorthosite (zircon); ( b ) Du Bras granite (zircon); ( c ) amazonite dyke (monazite); ( d ) Venus de Milot (zircon); ( e ) wollastonite skarn (titanite). Fig. 4. Concordia diagrams: ( a ) Lac-Saint-Jean anorthosite in the Lac-aux-Grandes-Pointes region; ( b ) Du Bras granite; ( c...

... that are interpreted to correspond to the basements, from southeast to northwest, of Avalon terrane sensu stricto, Brookville–Bras d’Or terrane, and Exploits–Gander composite terrane. The latter “Gander basement” underlies the Kingston, New River, Mascarene, and St. Croix terranes. Regional magnetic and gravity map...

...: The role of ice sheets in Reorganizing Groundwater flow Systems. Reviews of Geophysics 45. Raeside , R.P. Barr , S.M. 1990 . Geology and tectonic development of the Bras d’Or suspect terrane, Cape Breton Island, Nova Scotia . Can. J. Earth Sci. 27 ( 10 ): 1371 – 1381 . 10.1139/e90-147...