Late Early Paleozoic and Early Mesozoic intracontinental orogeny in the South China Craton: Geochronological and geochemical evidence

摘要: Abstract The late Early Paleozoic and Mesozoic tectonic events in South China have been central to the debate over plate subduction versus intracontinental orogeny. Here we present zircon U–Pb geochronology, Hf isotopes whole-rock geochemistry of six representative granitic plutons from China. data show two groups with 206Pb/238U ages ca. 430 Ma 225 Ma, representing crystallization magma. investigated this study are characterized by peraluminous nature high A/CNK values (> 1.1) presence aluminous minerals like muscovite. They exhibit enrichment LREE, depletion Eu, negative Ba, Sr, Nb Ti anomalies Rb, Th, U Pb. All samples variably eHf(t) (− 2 − 16) two-stage model clustered around 1.5–1.8 Ga. These indicate that both magmas were generated partial melting early-middle Paleoproterozoic basement rocks without significant input mantle material. distribution all 225 Ma unrelated regime. Combining other geological evidence, our suggests tectono-magmatic during largely related orogeny triggered interactions between Yangtze Cathaysia continental blocks. far-field stress propagation derived boundary might played a crucial role as primary cause field within interior Craton.