Mid−late Neoproterozoic tectonic evolution of the northern margin of the Yangtze Block, South China, as constrained from the detrital zircon record

The northern margin of the Yangtze Block (NYB) experienced distinct tectono-magmatic evolution during mid- and late-Neoproterozoic, as compared with northwestern margins (NWYB), although geodynamic mechanism remains controversial. South Qinling Belt (SQB), which forms northernmost NYB, is a significant target for studying Neoproterozoic tectonic NYB. Here we present U-Pb geochronology Lu-Hf isotopes detrital zircons from clastic rocks belonging to Yaolinghe Wudangshan Groups in SQB. ages reveal that maximum depositional are respectively ca. 630 Ma 680 Ankang Wudang Uplifts. Based on compilation Hf−Nd−O isotopic data well multidimensional scaling (MDS) analysis, Group suggested be sourced mainly NWYB, whereas those were derived mostly NWYB compiled also indicate 800−680 northeastward migration magmatism response slab rollback 680−600 eastward resulting tearing. A model proposed envisages an arcuate subduction system around mid−late Neoproterozoic. continuous tearing underneath NYB resulted extensional environment at time. underwent uplift erosion, detritus was transported new can account two groups volcanic Group.