“…Genetic models for mafic enclaves include origins as foreign xenoliths (usually country rocks) (e.g., Vernon, 1983;Bacon, 1986;Xu et al, 2006), refractory and residual phase assemblages derived from granitoid sources (e.g., Chappell et al, 1987;Chappell and White, 1991), chilled material or accumulations of early-formed co-genetic crystals (e.g., Tindle and Pearce, 1983;Bonin, 1991;Schonenberger et al, 2006;Shellnutt et al, 2010), and the products of mixing between distinct mafic and felsic magmas (e.g., Holden et al, 1987;Wiebe et al, 1997;Barbarin, 2005;Browne et al, 2006;Yang et al, 2006Yang et al, , 2007Chen et al, 2009;Kent et al, 2010;Sun et al, 2010). The mafic enclaves in the Tunchang granodiorites are ellipsoidal, spindle-shaped, or elongate, and exhibit typical magmatic texture (Figs.…”