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Geochemical, Sr-Nd-Pb, and zircon Hf-O isotopes of Cenozoic K-adakitic and shoshonitic granitoid rocks in Western Yunnan, SW China: Petrogenesis and tectonic implications

34th International Geological Congress Abstract

Coeval and cospatial shoshonitic and K-adakitic felsic intrusions (37-32Ma) are recognized in western Yunnan, SW China. Shoshonitic syenites and quartz monzonites have high K2O (4.9-6.8 wt%) and K2O/Na2O (1.1-1.7), enriched LREE and LILE, and depleted Nb, Ta, Ti, P with high Y (15.7-34.8ppm) and Yb (1.50-3.16ppm) content and flat HREE patterns.