The Early Cretaceous evolution of SE China: Insights from the Changle–Nan'ao Metamorphic Belt

摘要: Abstract The Mesozoic geology in SE China is characterized by widespread Jurassic–Cretaceous magmatism. There appears, however, an episode of “magmatic quiescence” at ca. 130–110 Ma terms increasing high-precision isotopic age data. causes and regional tectonic significance this magmatic quiescence are unclear. In paper, we report integrated situ U–Pb, Hf O isotope analyses zircons from four mica schist samples along Changle–Nan'ao Metamorphic Belt coast, use these data to discuss the provenances metasedimentary rocks, timing metamorphism their implications for evolution. majority schists euhedral anhedral crystals showing clear concentric zoning under cathodoluminescence (CL) images. zircon rims with bright luminescence overgrown on some zoned zircons. all homogeneous U–Pb ages (between 131 148 Ma, peaking 141 Ma), isotopes (δ18O = 5.6 ± 0.8‰, 2SD, n = 106), and, less extent, (eHf(T) = − 4.7 − 1.4 Dongshan schists, 2.2 Putian schists). They most likely detrital sourced Early Cretaceous felsic volcanic rocks (the Nanyuan Formation) and/or coeval intrusions Fujian Province. sedimentary protoliths were deposited fore-arc basins. metamorphic overgrowths have relatively low Th/U ratios; they dated ~ 130–100 Ma, two peaks ~ 125 Ma ~ 108 Ma. first coincident quiescence, while second ~ 108 Ma consistent reinitiation We a model collision between West Philippines blocks interpret our new results. According model, intensive (ca. 140–130 Ma) magmatism coastal region was attributed subduction Paleo-Pacific plate beneath China. Collision ~ 130–120 Ma resulted formation Belt. Post-collisional extension triggered associated amphibolite-facies ~ 110 Ma.