Multiple-Stage Neoproterozoic Magmatism Recorded in the Zhangbaling Uplift of the Northeastern Yangtze Block: Evidence from Zircon Ages and Geochemistry

The Yangtze Block records Neoproterozoic magmatism and sedimentation related to the breakup of Rodinia is an important piece in reconstruction supercontinent. However, tectonic setting position this block remain a subject debate. In present study, we report zircon U-Pb ages Hf isotopic composition geochemical Nd-Pb compositions for meta-volcanic rocks exposed Zhangbaling uplift NE Block. volcanic rocks, dominated by rhyolite dacite, belong calc-alkaline series show characteristics arc rocks. Zircon that Xileng Formation formed at ca. 790 Ma 760–700 peaking ~740 Ma. late-stage volcanism was widely uplift, characterized temporal-spatial trend becoming younger southwards. old have low initial εNd (−11.0) εHf (−19.7 −8.2) values Pb ratios, likely indicating origin from ancient basement underneath ones, being similar continental andesite trace element compositions, relatively high (mostly −4.6 0.5) (−0.4 8.8) ratios. These features point partial melting juvenile crustal Sedimentary overlying strata also contain numerous grains ~700 ~630 might demonstrate long-lasting subduction along northeastern margin Block, probably active until 700