Petrogenesis and Tectonic Setting of the Guantian and Shangbao Granodiorite, Southern Zhuguangshan Complex, China: Evidence from Zircon U-Pb-Hf Isotopes, and Whole-Rock Geochemistry and Sr-Nd Isotopes
Randomized analysis reveals petrogenesis and tectonic settings in granodiorites, suggesting formation in an extensional context.
Key Points
This research aims to investigate the petrogenesis and tectonic setting of the Guantian and Shangbao granodiorites using zircon U-Pb-Hf isotopes and geochemical data.
Utilized LA-ICP-MS for zircon U-Pb dating and Hf isotopic analysis.
Conducted whole-rock geochemical analyses including Sr-Nd isotopic data for the granodiorites.
Analyzed emplacement ages of ca. 431.5 and 442.3 Ma for the respective plutons.
Guantian and Shangbao granodiorites classified as metaluminous I-type granites with high Al2O3 and total alkali contents.
Zircon U-Pb ages indicate emplacement around 431.5 Ma and 442.3 Ma with negative εNd(t) and εHf(t) values, suggesting a crustal source.
Geochemical signatures support formation in a post-collisional extensional setting.