1988
DOI: 10.1016/0168-9622(88)90018-8
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Neodymium and strontium isotopic constraints on the origin of the peraluminous granitoids of the South Mountain Batholith, Nova Scotia, Canada

Abstract: Nd isotopic data from the South Mountain batholith show that ita peraluminous granitic rocks have considerably higher thd (t=372 Ma) values (-5.2 to-1.4) than the extensive flyschoid country rocks (-11.2 to-8.7). These isotopic data are combined with Sr isotopic measurements to estimate the involvement of the country rocks, either as source materials or as contaminants, in the batholith. Metasedimentary enclaves in the batholith generally have Nd and Sr isotopic compositions intermediate between those of the b… Show more

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Cited by 44 publications
(21 citation statements)
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“…This tendency of lower crustal granulites towards isotopically more primitive compositions has maj or consequences when evaluating the contrib ution of crustal sources in the genesis of granitic magma s. First, it can explain the apparent absence of the isotopically appropriate cI1l stal protoliths in the ou t cropping metamorphic rocks, as has been discussed in several studies [the strontium paradox of Bemard Griftiths et a!. (1985) and Peucat et al (1988); see also Clarke et al (1988)] . The second consequence is th at the imp ortant mantle contribution required by mixing models fo r some of the SCS gTanites which involve mantle-derived end-members and cI1l stal materials Ave ra ae orthogne iss is ta ken fro m Villaseca et al (1993).…”
Section: Restitic Character Of the Scs Lower Crust: Itnplications Fo mentioning
confidence: 89%
“…This tendency of lower crustal granulites towards isotopically more primitive compositions has maj or consequences when evaluating the contrib ution of crustal sources in the genesis of granitic magma s. First, it can explain the apparent absence of the isotopically appropriate cI1l stal protoliths in the ou t cropping metamorphic rocks, as has been discussed in several studies [the strontium paradox of Bemard Griftiths et a!. (1985) and Peucat et al (1988); see also Clarke et al (1988)] . The second consequence is th at the imp ortant mantle contribution required by mixing models fo r some of the SCS gTanites which involve mantle-derived end-members and cI1l stal materials Ave ra ae orthogne iss is ta ken fro m Villaseca et al (1993).…”
Section: Restitic Character Of the Scs Lower Crust: Itnplications Fo mentioning
confidence: 89%
“…Figure 13. Lower limit of ε Nd t vs. crystallization age for Avalonian igneous rocks compared to (1) igneous and sedimentary rocks and xenoliths (Mb = metabasaltic; Ms = metasedimentary) in Devonian intrusions from the Meguma and Gander terranes (Clarke & Halliday, 1985;Clarke, Halliday & Hamilton, 1988;Clarke, Chatterjee, & Giles, 1993;Eberz et al 1991;Kerr, Jenner & Fryer, 1995); (2) Grenville-aged rocks of eastern and southern Ontario and northern New York state (Dickin & McNutt, 1989;Dickin, McNutt & Clifford, 1990;Marcantonio et al 1990;Daly & McLelland, 1991); (3) igneous rocks in and on the Blair River Complex (triangles: Barr & Hegner, 1992); (4) plutonic rocks from West Africa (data point and evolution envelope from Allegre & Ben Othman, 1980) and (5) the Tocatins Province, Brazil (Pimentel & Fuck, 1992). the ε Nd -time signatures of the felsic magmas in the Meguma Terrane (White Rock Formation and uncontaminated Upper Devonian plutonic rocks) reveals that they too had an isotopic source indistinguishable from that beneath the Avalon Terrane.…”
Section: B Avalon-meguma Relationshipsmentioning
confidence: 99%
“…6). This mismatch could imply that there is an apparent absence of isotopically appropriate crustal protoliths, as has also been discussed for other areas (e. g. Bernard-Griffiths et al, 1985;Bickle et al, 1988;Clark et al, 1988;Liew et al, 1989;Peucat et al, 1988;Villaseca et al, 1998). In distinct regions, however, the Sr isotopic compositions of lower continental crust tend to be less radiogenic than at upper crustal levels (e.g.…”
Section: Anatectic Granitic Rocks and Their Protolithsmentioning
confidence: 87%