Tectonic evolution of the southeastern margin of the Yangtze Block: Constraints from SHRIMP U-Pb and LA-ICP-MS Hf isotopic studies of zircon from the eastern Jiangnan Orogenic Belt and implications for the tectonic interpretation of South China

Reconstructing South China in Phanerozoic and Precambrian supercontinents

“…Baltica that rifting and platform formation occurred in the late Mesoproterozoic at a location corresponding approximately with the younger Teisseyre-Tornquist line (Bogdanova et al, 2008;Nikishin et al, 1996;Poprawa and Pacze´sna, 2002) A C C E P T E D M A N U S C R I P T (Sun et al, 2008;Wu et al, 2008b;Yin et al, 2013a;Zhang et al, 2006). Nevertheless, the widespread distribution of orogenesis of this age within Nuna (Zhao et al, 2002), means that the presence of such a metamorphic event cannot by itself accurately constrain the position of the Yangtze Block within the supercontinent.…”

Geochronology and geochemistry of volcanic rocks from the Shaojiwa Formation and Xingzi Group, Lushan area, SE China: Implications for Neoproterozoic back-arc basin in the Yangtze Block

“…825 Ma, caused by a superplume which induced the breakup of the Rodinia supercontinent (e.g., Li et al, 1995Li et al, , 2003aLi et al, ,b, 2004Wang and Li, 2003;Wang et al, 2007a). In contrast, other workers suggest that subduction lasted to 830 Ma or even younger (e.g., Wang et al, 2007b;Li et al, 2011;Zhao et al, 2011;Zhang et al, 2012b;Yin et al, 2013), and subsequent extension occurred during 800-760 Ma and resulted from post-orogenic relaxation or intra-continental rifting (Zheng et al, , 2008. One of the most important issues is determining which stage of the tectonic process these igneous rocks produced.…”

“…Recently Neoproterozoic back-arc basins that are closely linked to the plate subduction process have been identified in South Anhui (Zhang et al, 2012a;Yin et al, 2013) and Northeast Hunan (Zhang et al, 2013) providing another perspective to constrain the Precambrian tectonic evolution of SCB. However back-arc basin basalt (BABB) has rarely been reported in the whole Jiangnan Orogen and Yangtze Block.…”

Early Cretaceous potassic volcanic rocks in the Jiangnan Orogenic Belt, East China: Crustal melting in response to subduction of the Pacific–Izanagi ridge?

“…(2008) and Yin et al (2013). The 176 Lu/ 177 Hf for the upper continental crust is 0.0125 (Chauvel et al, 2014).…”

“…Melting of pelitic and granitic sources with high K 2 O concentrations, like those forming the basement to the JOB (Wu et al, 2006b;Wang et al, 2008Wang et al, , 2010Zheng et al, 2008;Yin et al, 2013), occurs through muscovite-and biotite-dehydration and will produce potassium-rich and strongly peraluminous melts (Thompson, 1982;Patiňo Douce et al, 1990;Gardien et al, 1995). Melting of calc-alkaline to tholeiitic basalts will produce low-K to calc-alkaline felsic magmas (Fig.…”