Journal
TECTONOPHYSICS
Volume 655, Issue -, Pages 206-212Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tecto.2015.06.001
Keywords
Late Devonian; Meguma terrane; Avalonia; South Mountain Batholith; Granulites; Nova Scotia
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Funding
- National Science Council of Taiwan [NSC 102-2628-M-003-001-MY4]
- Natural Sciences and Engineering Research Council (Canada) [3782-2011]
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The Late Devonian South Mountain Batholith (SMB) of Nova Scotia is the largest batholith-of the northern Appalachians. The peraluminous granitic rocks range from biotite granodiorite to leucogranite. Samples collected from a drill core of the Scrag Lake granodioritic pluton of the western SMB are chemically homogeneous from the surface to a depth of similar to 1425 m. The homogeneous composition implies that the granodiorite was derived from a relatively homogeneous source and that country rock assimilation was not an important source for the parental magma. Equilibrium partial melt modeling of underlying sub-Meguma granulite rocks indicates that they are the primary source rocks of the granodiorites. We suggest that mantle-derived magmas intruded the lower crust and induce large-scale melting of the granulite basement rocks to produce the granodiorites. Fractional crystallization of the granodiorites plus assimilation of Meguma Supergroup metasediments likely produces the silica-rich rocks of the SMB. The cause of mantle melting is uncertain however it may be related to the transitioning of the northern Appalachians from a position above the deep mantle Pacific large low shear velocity province (LLSVP) to a higher shear velocity region of the mantle. (C) 2015 Elsevier B.V. All rights reserved.
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