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- W1966191878 abstract "In the Eastern Central Mobile Belt of the Newfoundland Appalachians, late Precambrian basement inliers have ε Nd from −3 to +2, but Cambro-Ordovician metasedimentary rocks have initial ε Nd below −7. This region is inferred to have an inverted crustal residence structure, which influenced subsequent Appalachian-cycle magmatism. Ordovician and Silurian granitoid suites have ε Nd of −8 to −2, bracketing both basement and cover, but peraluminous, S-type granites have the lowest ε Nd . Devonian granites have initial ε Nd values from −5 to +1, and low ε Nd is associated with peraluminous character. These Paleozoic granites show geographic trends, with lowest ε Nd values in areas where metasedimentary rocks are abundant. They are suggested to contain anatectic material from both Precambrian basement and metasedimentary cover, but some I-type suites probably also include a mantle-derived component. In the adjacent Avalon Zone, Precambrian plutonic suites mostly have ε Nd from +1 to +6, but there are negative ε Nd values (−8 to −4) in the westernmost Avalon Zone. Devonian plutonic suites mostly have ε Nd from +2 to +5. Thus, the Precambrian crust of the Avalon Zone is largely juvenile, except at its westernmost edge. Contrasts across the Eastern Central Mobile Belt–Avalon Zone boundary, defined by the Dover–Hermitage Bay fault system, indicate a major, crustal-scale structure, and suggest an isotopically distinct central block beneath the central Appalachian Orogen, rather than a simple extension of Avalonian crust. Similar geographic–isotopic patterns have been reported in Nova Scotia and New Brunswick, suggesting that this pattern represents a first-order deep-crustal subdivision of the northern Appalachian Orogen." @default.
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- W1966191878 date "1995-02-01" @default.
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- W1966191878 title "Sm–Nd isotopic geochemistry of Precambrian to Paleozoic granitoid suites and the deep-crustal structure of the southeast margin of the Newfoundland Appalachians" @default.
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- W1966191878 doi "https://doi.org/10.1139/e95-019" @default.
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