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\begin{document}

\title{Revisiting Neoproterozoic tectono-magmatic evolution of the northern
margin of the Yangtze Block, South China}



\author[1,2]{Peng Wu}%
\author[3]{Yuan-Bao Wu}%
\author[4]{Shao-Bing Zhang}%
\author[4]{Yong-Fei Zheng}%
\author[5]{Long Li}%
\author[6]{Ying Gao}%
\author[1,2]{Hao Song}%
\author[1,2]{Zhengqi Xu}%
\author[1,2]{Zeming Shi}%
\affil[1]{Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province, Chengdu University of Technology, Chengdu, Sichuan 610059, China}%
\affil[2]{College of Earth Science, Chengdu University of Technology, 610059, China}%
\affil[3]{State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China}%
\affil[4]{CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China}%
\affil[5]{Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada}%
\affil[6]{State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of Earth Sciences, Chengdu University of Technology, Sichuan 610059, China.}%


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  \date{June 16, 2024}


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\begin{abstract}
The Neoproterozoic tectonics of South China is crucial for understanding
its evolution history throughout the assembly and disintegration of
Rodinia. Herein, we employ integrally tectono-magmatic records over the
period of \textasciitilde{}1.0-0.6 Ga from the northern Yangtze block,
combining with available geochemical and geological data, to investigate
the secular tectonic evolution of the craton. Early Neoproterozoic
intra-oceanic subduction may have initiated at \textasciitilde{}1.0-0.9
Ga after a long-period of late Mesoproterozoic passive margin. A
flare-up of magmatism at \textasciitilde{}900 Ma attributed to
continental arc magmatism that led to increased crustal reworking during
episodes of arc compression and lithospheric thickening, and
subsequently enhanced juvenile mantle input during the transition to
extensional back-arc rift modes. The isotope--time pattern displays
cyclic trends shifting towards less radiogenic values and then
progression to more radiogenic, near-depleted mantle isotope
compositions, indicating alternation regimes of contractional and
extensional tectonics due to repeatedly slab advancing and rollback. The
occurrence of volumetrically-large radiogenic isotope-depleted
calc-alkaline rocks associations, low-\selectlanguage{greek}δ\selectlanguage{english}18O and bimodal rocks along the
Yangtze-block continental margin likely indicates rapid reworking of
juvenile crust within a composite tectonic setting involving both arcs
and rifts, which may maintain until the end of calc-alkaline arc
magmatism at \textasciitilde{}730-720 Ma and ultimately evolved into an
anorogenic rifted passive margin setting, as revealed by the deposition
of massive \textasciitilde{}720-620 Ma syn-rift Yaolinghe-group
volcanic-sedimentary sequence and intraplate-like magmatism.
Collectively, prolonged (\textasciitilde{}1.0-0.7 Ga)
suprasubduction-related magmatism traces accretion to the Yangtze-block
margin, and thus likely indicates a paleogeographically peripheral
position of South China in Rodinia.%
\end{abstract}%



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