The Neoproterozoic magmatism in the northern margin of the Yangtze Block: Insights from Neoproterozoic (950–706 Ma) gabbroic-granitoid rocks of the Hannan Complex

Neoproterozoic active margin in the northwestern Yangtze Block, South China: new clues from detrital zircon U–Pb geochronology and geochemistry of sedimentary rocks from the Hengdan Group

“…Cawood et al 2012). From a regional perspective, this age pulse coincides well with the extensive magmatism along the western margin of the Yangtze Block, mostly including c. 880-775 Ma diorites and bimodal volcanic rocks in the Bikou Terrane (Yan et al 2004;Lai et al 2007;Xiao et al 2007;XC Wang et al 2008;W Wang et al 2012), c. 890-705 Ma gabbroic to granitic plutons in the proximal Hannan-Micangshan Massif (Zhou et al 2002;Ling et al 2003;, 2009Zhao et al 2010;Dong et al 2011Dong et al , 2012Luo et al 2018;Ao et al 2019;Hui et al 2020a), and c. 865-750 Ma gabbroic-granitic intrusions and relevant volcanic rocks in the southerly Xuelongbao-Kangding-Miyi areas (e.g. XH Li et al 2002;ZX Li et al 2003;Zhou et al 2006a;Lai et al 2007;Zhao & Zhou 2007;Zhao et al , 2018Zhao et al , 2019Meng et al 2015).…”

“…All these units are unconformably overlain by Cryogenian-Ediacaran strata, which are mainly composed of glacial to epicontinental marine deposits (e.g. SH Zhang et al 2008;Bao et al 2018).…”

Geochemical and zircon U-Pb-Hf isotopic study of volcanic rocks from the Yaolinghe Group, South Qinling orogenic belt, China: Constraints on the assembly and breakup of Rodinia

“…880-775 Ma magmatic rocks in the Bikou Group (Yan et al, 2003;Xiao et al, 2007;Lai et al, 2007;Wang et al, 2008;Hu et al, 2021). The Micangshang-Hannan massif contains numerous Neoproterozoic gabbros, diorites, and granites with crystallization ages ranging from 898 Ma to 706 Ma (Zhou et al, 2002;Zhao andZhou, 2008, 2009;Zhao et al, 2010b;Dong et al, 2011aDong et al, , 2011bDong et al, , 2012Wang et al, 2016a;Luo et al, 2018;Ao et al, 2019;Hui et al, 2020). The Huangling dome intruded into the Kongling Complex and comprises ca.…”

“…The Neoproterozoic is a significant period in the history of the Earth on account of large-scale crustal growth, major snowball events, and the assembly and breakup of the Rodinia supercontinent (Hoffman et al, 1998;Li et al, 2008b). Widespread Neoproterozoic magmatism has been reported throughout the periphery of Yangtze craton in South China (Li et al, 1995(Li et al, , 2008aZhou et al, 2002;Zheng et al, 2008;Zhao et al, 2018b), including 950-835 Ma arc-type magmatic rocks that developed at convergent margins during the assembly of Rodinia (Zhou et al, 2002;Li et al, 2009;Zhao et al, 2010b;Dong et al, 2012;Luo et al, 2018;Ao et al, 2019), and 830-630 Ma rift-type magmatic rocks that formed in a large-scaled extensional setting (Li et al, 2008a;Ling et al, 2008;Wang et al, 2008Wang et al, , 2019Li and Zhao, 2016;Luo et al, 2018;Ao et al, 2019). However, the tectonic mechanism leading to the transition from subduction to extension is still controversial.…”

“…The plume-rift model places South China between Laurentia and Australia inside the Rodinia supercontinent and attributes the 830-795 Ma and the 780-745 Ma magmatism to mantle superplume activity accompanying the breakup of Rodinia (Li et al, 1995(Li et al, , 1999(Li et al, , 2008bWang et al, 2008;Gao et al, 2016). The slab-arc model proposes that a long-lived continental arc system existed at the western and northern margins of the Yangtze craton during the Neoproterozoic, and that rift-related magmatism developed in a back-arc rift setting by rollback of the subducting oceanic slab (Zhou et al, 2002(Zhou et al, , 2006Zhao and Zhou, 2008;Zhao et al, 2010bZhao et al, , 2018Dong et al, 2011bDong et al, , 2012Luo et al, 2018;Ao et al, 2019). The plate-rift model places the geodynamic process at the southern and eastern margin of the Yangtze craton, and suggests that orogenic collapse (830-800 Ma) and subsequent lithospheric extension (780-740 Ma) drove supercontinent rifting and breakup (Zheng et al, 2007(Zheng et al, , 2008.…”