Zircon U–Pb dating of water–rock interaction during Neoproterozoic rift magmatism in South China

Detachment within subducted continental crust and multi-slice successive exhumation of ultrahigh-pressure metamorphic rocks: Evidence from the Dabie-Sulu orogenic belt

“…These rocks underwent a low-grade metamorphism of greenschist to epidote-amphibolite facies. Ar-Ar ages [17] of hornblende from the granitic gneisses of the Luzhenguan complex are consistent with their zircon U-Pb dating results [36,38] (~750 Ma), suggesting that their protolith ages were not affected by the later metamorphism. However, an Ar-Ar age of 241.9 ± 2.3 Ma given by muscovite from these rocks [17] indicates the metamorphism experienced by these rocks related to the Triassic continental collision.…”

“…Shanqi and Chengchong) from the Luzhenguan complex in the eastern segment of the Beihuaiyang zone ( Figure 1) and the Wulian granitic gneiss from the northern low-grade metamorphic zone in the Sulu area ( Figure 3) were formed at the Neoproterozoic and ascribed to be part of the northern margin of the South China Block (SCB) [17,29,[32][33][34][35][36][37][38][39] . These rocks underwent a low-grade metamorphism of greenschist to epidote-amphibolite facies.…”

Multistage evolution of continental collision orogen: A case study for western Dabie orogen

“…is 2.0-2.2 GPa, suggesting that it belongs to the HP metamorphic eclogite zone [55,[58][59][60] . In situ zircon U-Pb dating yielded the protolith ags of 684 ± 15 Ma-779 ± 6 Ma [17,48,53,57] for granitic gneisses and eclogites in these zones (Figure 4), corresponding to Neoproterozoic synrift magmatism around the Yangtze Block [48,24,30,50,[68][69][70] . Hf isotope compositions of zircons in these granitic gneisses and eclogites imply the immediate reworking of Neoproterozoic juvenile crust or the derivation from a depleted mantle [57] .…”

Zircon U‐Pb Age and Geochemistry of Rhyolite in Jianshui, Yunnan and Its Geological Implications

“…A series of studies has been made on the protolith of UHP eclogites and gneisses in the Dabie-Sulu orogenic belt (Rumble et al, 2002;Zheng et al, 2003aZheng et al, ,b, 2004Zheng et al, , 2006Zheng et al, , 2007aZheng et al, , 2008aZheng et al, , 2009Wu et al, 2007;Tang et al, 2008a, b;Chen et al, 2011;Fu et al, 2013 (Fu et al, 2013). The average δ…”

“…Metagranite in the Beihuaiyang low-grade zone is such a candidate because it only suffered metamorphism of greenschist facies. Studies of granites from the Beihuaiyang zone were made by Wu et al (2007) and Zheng et al (2007a …”