Abstract:

In this study, we present detailed SHRIMP zircon U-Pb chronology, major and trace elements, and Sr-Nd-Hf isotope data for the Ehu pluton in northeastern Jiangxi province, in an attempt to better constrain its petrogenesis. SHRIMP zircon U-Pb dating shows that the Ehu pluton was emplaced in the Early Cretaceous (121.7 Ma±2.9 Ma). Petrographic, elemental and Sr-Nd-Hf isotopic characteristics suggest that the Ehu granites are of S-type, generated by partial melting of Paleoproterozoic metasedimentary basement in the deep (>40 km) crust, with no fractional crystallization and mantle-derived magma mixing in their evolution. The upwelling of asthenosphere during the Early Cretaceous extensional tectonic regime in the region induced partial melting of the lower crust.

Key words: Ehu granite, northeastern Jiangxi province, SHRIMP zircon U-Pb age, Sr-Nd-Hf isotope