Detrital zircon record of Neoproterozoic active-margin sedimentation in the eastern Jiangnan Orogen, South China

Detrital zircon U–Pb geochronology, Hf isotopes and geochemistry constraints on crustal growth and Mesozoic tectonics of southeastern China

“…2600-2300 Ma zircon population in all samples from this study have also been reported by previous studies of late Precambrian metasediments (e.g., Wan et al, 2007), Neoproterozoic sandstone (e.g., Wang et al, 2010aWang et al, , 2013, Permian sandstones (e.g., Li et al, 2012a) and present-day river sands (e.g., He et al, 2013) from the South China Block. However, rocks of Archean age were only found in the Yangtze Craton, which were dated at ca.…”

“…6). This isotopic features exclude the Shuangxiwu magmatic arc along the southeastern margin of the Yangtze Block as a possible source as those magmatic rocks have both whole rock and zircons characterized by depleted mantle-like Hf isotopes with eHf(T) range from +9 to +15 (Chen et al, 2009a;Chen et al, 2009b;Li et al, 2009), whereas this zircon Hf isotopic features grossly match that of the volcaniclastic and clastic sedimentary rocks from the Neoproterozoic Nanhua Basin (e.g., Wang et al, 2010aWang et al, , 2012Wang et al, , 2013. The detrital zircons of this age interval in our study mainly are euhedral or subhedral, indicating short-distance transportation.…”

Middle Neoproterozoic (∼845Ma) continental arc magmatism along the northwest side of the Jiangshan–Shaoxing suture, South China: Geochronology, geochemistry, petrogenesis and tectonic implications

“…1a) that was inferred by Zhao (2015) to have been formed in a continental arc setting coupled with southeastward subduction of the South China Ocean underneath the Cathaysia Block. (4) Wang et al (2013) have investigated the sedimentary sequences of the Shuangqiaoshan and Xikou Groups and suggest that they might have deposited in a back-arc basin at ca. 831-815 Ma and 833-817 Ma, respectively.…”

“…800 Ma on the basis of new data concerning magmatic rocks and sedimentary strata (e.g. Zhou et al, 2004Zhou et al, , 2009Zheng et al, 2008, Wang et al, 2013). ca.…”

“…In addition, recent investigation on the sedimentary sequences of the Shuangqiaoshan and Xikou Groups suggest that they might have deposited in a back-arc basin at ca. 833-817 Ma (Wang et al, 2013), rendering it impossible that the final amalgamation of the Yangtze Block with the Cathaysia Block took place during the early Neoproterozoic.…”