Geochemistry and petrogenesis of Jurassic high Sr/low Y granitoids in eastern China: Constrains on crustal thickness.

Discusses the Jurassic high Sr/low Y granitoids in eastern China. Finding that they have high Sr/Y and La/Yb ratios and low abundance in Y and Yb; How they compare to adakites defined by Defant and colleagues; How these high Sr/low Y granitoids compare to typical adakites in circum-Pacific margins; Finding of relatively flat HREE patterns with Y/Yb values of -10 close to the chondritic value; Indication that the geochemical characteristics show a residue mineral assemblage of hornblende, garnet and plagioclase for the high Sr/low Y granitoids melt; Conclusion they were generated by partial melting at 9—13 kbar (30—45 km in depth); Similarity to the Archaean high-Al TTG; Assertion that these high Sr/low Y granitoids should not be cited as evidence for a thickened crust and/or the presence of the "Eastern China Plateau" in Jurassic.