Middle to late Jurassic felsic and mafic magmatism in southern Hunan province, southeast China: Implications for a continental arc to rifting

Zircon U–Pb, molybdenite Re–Os and muscovite Ar–Ar isotopic dating of the Xitian W–Sn polymetallic deposit, eastern Hunan Province, South China and its geological significance

“…However, some of them are recently classified as fractionationed I-type granites or A-type granites (Zhou and Li, 2000;Ma et al, 2004;Fu et al, 2004a;Bai et al, 2005;Jiang et al, 2005Jiang et al, , 2006Jiang et al, , 2009Jiang et al, , 2011Li et al, 2007e, 2014aHuang et al, 2011;Zhou et al, 2013). All these rocks constitute melts generated in an anorogenic, intraplate environment where regional lithospheric extension occurred in the Early Yanshanian Jiang et al, 2009Jiang et al, , 2011Zhou et al, 2013).…”

“…The flat subduction of the Paleo-Pacific plate beneath the SCB in Mesozoic might have terminated beneath the belt, where there existed contemporaneous bimodal magmatism, diagnostic of the continental arc to intra-arc rift setting due to slab rollback (Jiang et al, 2009 and references therein); (2) The Early Yanshanian granitic magmatism took place only in the Nanling region, with a southeastward-younging trend, in comparison with the distribution of the Late Yanshanian (140-90 Ma) volcanic and intrusive rocks near to the coast (Gilder et al, 1991;Chen and Jahn, 1998;Zhou and Li, 2000;Sun et al, 2003;Wang et al, 2005;Li et al, 2006;Li and Li, 2007;Li et al, 2007a). Li and Li (2007) attributed this younging trend to the slab rollback or high-angle subduction of the Paleo-Pacific plate (Fig.…”

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

“…Although the origin of Mesozoic magmatism in SE China has widely been attributed to subduction of the Paleo-Pacific Plate (Zhou and Li, 2000;Li and Li, 2007;Sun et al, 2007Sun et al, , 2010Yan et al, 2008;Jiang et al, 2009Jiang et al, , 2011Li et al, , 2013Liu et al, 2010;Xie et al, 2011;Tang et al, 2013;Yang et al, 2014), typical subduction-related magmas (e.g., tholeiitic to calk-alkaline basalts and andesites, Harry and Green, 1999) are lacking in the area. Instead, high-T potassic and felsic volcanic lavas and their intrusive counterparts are common (Wang et al, 2006).…”

Geochronology, geochemistry and geodynamic implications of the Late Mesozoic volcanic rocks in the southern Great Xing’an Mountains, NE China

“…10a). Furthermore, the Dy/Yb ratio is an important geochemical index for distinguishing partial melting between the spinel and garnet stability fields of an amphibole-and/or phlogopite-bearing lherzolite (Duggen et al, 2005;Jiang et al, 2009). Partial melting in the garnet stability field generally leads to high Dy/Yb ratios (>2.5), whereas melting in the spinel stability field would produce melts with low Dy/Yb ratios (<1.5).…”