The enigmatic sources of I-type granites: The peritectic connexion
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...Hf isotopic heterogeneity is also observed in magmatic zircons of I-type granitoids generated in arc environments, thus confirming field and petrological evidence that most granitoid protoliths are not chemically homogeneous (e.g., Clemens et al., 2011; Miller et al., 2011)....
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...erals (garnet or clinopyroxene) as proposed by Clemens et al. (2011). Three selected...
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..., 1998) as well as metaluminous “I-type” granites (Clemens et al., 2011) show a negative correlation between A/CNK and Fe+Mg....
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...Recently, the restite-unmixing hypothesis has been refi ned into the “peritectic assemblage entrainment” hypothesis of Clemens et al. (2011) and Clemens and Stevens (2012)....
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...One explanation for this discrepancy is that natural melts selectively entrain peritectic minerals from the source (Stevens et al., 2007; Clemens et al., 2011; Clemens and Stevens, 2012), and that these entrained mineral grains are dissolved or achieve equilibrium during ascent through a process of…...
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...—Bowen (1947) Today, the difference of opinion has transferred to the fi eld of isotope geochemistry, where it refers to the proportion of mantle versus crustal source material in granites (e.g., Kemp et al., 2009; Clemens et al., 2011; Clemens and Stevens, 2012)....
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...In contrast, Clemens et al. (2011) maintain that I-type granites are of purely crustal origin, but they are derived from arc volcanic and sedimentary rocks of intermediate composition that pass on the isotope signature of a mixed mantle and crustal source....
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...I typology refl ects the nature of the entrained material in both cases, and granites remain linked to their sources in this revised restite model (Clemens et al., 2011; Clemens and Stevens, 2012), even though they may not image their respective sources as earlier implied (Chappell et al., 1987;…...
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