Zircon U-Pb geochronology of the Mesozoic metamorphic rocks and granitoids in the coastal tectonic zone of SE China: Constraints on the timing of Late Mesozoic orogeny

摘要: Abstract The coastal Changle-Nan’ao tectonic zone of SE China contains important geological records the Late Mesozoic orogeny and post-orogenic extension in this part Asian continent. folded metamorphosed T3–J1 sedimentary rocks are unconformably overlain by Early Cretaceous volcanic or occur as amphibolite facies enclaves late Jurassic to early gneissic granites. Moreover, all metamorphic and/or deformed intruded fine-grained granitic plutons dykes. In order understand orogenic development, we undertook a comprehensive zircon U–Pb geochronology on variety rock types, including paragneiss, migmatitic gneiss, granite, leucogranite, granitoids. Zircon dating granites, gneisses, leucogranite dyke yielded similar age range 147–135 Ma. Meanwhile, protoliths some granites gneisses found be magmatic (ca. 165–150 Ma). little unmetamorphosed dykes were dated at 132–117 Ma. These new data indicate that lasted from 165 Ma) 135 Ma). transition syn-kinematic magmatism migmatization (147–136 Ma) post-kinematic plutonism (132–117 Ma) occurred 136–132 Ma.