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Geochemistry and petrogenesis of Jurassic high Sr/low Y granitoids in eastern China: Constrains on crustal thickness.
- Source :
-
Chinese Science Bulletin . Jun2002, Vol. 47 Issue 11, p962. 7p. - Publication Year :
- 2002
-
Abstract
- 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.
Details
- Language :
- English
- ISSN :
- 10016538
- Volume :
- 47
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Chinese Science Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 7718608
- Full Text :
- https://doi.org/10.1360/02tb9216