Petrogenesis of the 130 Ma Taolin granitic intrusion: Implications for the tectonic setting and diversity of Early Cretaceous felsic rocks in the Sulu orogenic belt, eastern China

摘要: Abstract Early Cretaceous felsic intrusions are widely exposed in the Sulu orogenic belt (SOB), eastern China. The Taolin granitic intrusion is an example of these and mainly comprises monzogranite, syenogranite, granite. Here we present new geochronological geochemical data for intrusion. ~130 Ma belongs to normal fractioned I-type granite divided into two groups based on differences. Rocks Daxiezhuang Malingzhan units belong Group 1 have relatively low SiO2 (61.35–69.44 wt%), high Sr/Y ratios (26.04–60.18), eHf(t) values (−27.2 −21.4), old TDM2 ages (2541–2903 Ma). They also display weak no negative Eu anomalies (Eu/Eu*=0.65–1.29). from Shibu Tiqiushan 2 (76.38–77.68 wt%), (0.61–12.38), (−24.3 −17.2) young (2271–2722 Ma). obviously (Eu/Eu*=0.10–0.42). partial melting Yangtze continental crust at different depths led variable elemental isotopic compositions magma 2. SOB was extensional environment during Cretaceous, which allowed formation magmatic rocks with Sr, Sr/Y, Sr/CaO values. were sourced by crustal reworking. There diverse rock types features SOB, ascribed heterogeneity complex evolution magma.