Neoproterozoic amalgamation between Yangtze and Cathaysia blocks: The magmatism in various tectonic settings and continent-arc-continent collision

摘要: Abstract According to the temporal-spatial distribution of Neoproterozoic igneous rocks and relative in South China, including ophiolites, arc volcanic intrusive subsequent bimodal magmatism, we identified presence a intra-oceanic arc, continent-arc-continent collision three tectono-magmatic zones between Yangtze Block Cathaysia Block. We have also unraveled amalgamation histories blocks: At ∼1000–860 Ma, northwestward ocean-ocean subduction southeastward ocean-continent resulted magmatism active continental margin respectively. ∼860–825 Ma, steepening caused development back-arc basin zone slab rollback induced Meanwhile, shallow dip formed ∼825–805 Ma, final blocks yielded Jiangnan Orogen. ∼805–750 Ma, Orogen collapsed, Nanhua rift formed. Our study rules out any Grenvillian Orogenic event mantle plume activity China indicates marginal position Rodinia supercontinent.