Triassic high-strain shear zones in Hainan Island (South China) and their implications on the amalgamation of the Indochina and South China Blocks: Kinematic and 40Ar/39Ar geochronological constraints

Geochronological and geochemical constraints on the petrogenesis of Middle Paleozoic (Kwangsian) massive granites in the eastern South China Block

“…It underwent three major tectonic events after its formation, namely the Kwangsian (middle Paleozoic), Indosinian (Triassic) and Yanshanian (Jurassic-Cretaceous) events (e.g., Chen, 1999;Chen et al, 2010;Haynes, 1988;Li, 1998;Li and Li, 2007;Ren, 1991;Shu, 2006;Shu et al, 1991Shu et al, , 2008aWang et al, 2002Wang et al, , 2005Wang et al, , 2007bWang et al, ,c, 2008Wang et al, , 2010Wang et al, , 2011Zhang et al, 2011a). Extensive granites formed in response to these events and occurred to the east of the AnhuaLuocheng Fault (Fig.…”

Late Early Cretaceous adakitic granitoids and associated magnesian and potassium‐rich mafic enclaves and dikes in the Tunchang–Fengmu area, Hainan Province (South China): Partial melting of lower crust and mantle, and magma hybridization

“…Hainan Island is generally considered to have been a part of the Cathaysia Block (e.g., Li et al, 2002aLi et al, , b, 2006aLi et al, , 2008 and mainly consists of large-scale Late Permian-Cretaceous granitoids and minor Cretaceous mafic dikes (e.g., Wang et al, 1991;Ge, 2003;Ge et al, 2003;Yun and Xie, 2003;Xie et al, 2005Xie et al, , 2006Yun et al, 2005;Li et al, 2006a;Chen et al, 2011;Zhang et al, 2011;Zhao et al, 2012). Exposed metamorphic basement rocks on the island consist of Mesoproterozoic (~1400 Ma) metavolcanic-intrusive- sedimentary rocks in the Baoban area (Fig.…”

“…1b) (e.g., Li et al, 2008). Phanerozoic (Cambrian-Silurian and Carboniferous-Cretaceous) strata (e.g., Wang et al, 1991;Li et al, 2002a, b;Xu et al, 2007Xu et al, , 2008Zhang et al, 2011), and Cenozoic basalts (e.g., Wang et al, 1991), also crop out on the island.…”

“…In this scenario, the 260-272 Ma Wuzhishan gneissic calc-alkaline I-type granites in central Hainan Island (Figs. 10 and 12;Li et al, 2006a;Zhang et al, 2011) were generated in a continental arc environment related to the initial subduction of the Paleo-Pacific oceanic plate beneath South China . However, Wang et al (2007d) and Zhang et al (2011) suggest that the Middle Permian-Triassic evolution of South China was related to the amalgamation of the Indochina and South China Blocks as the result of Paleotethys oceanic plate subduction and subsequent continental collision.…”

“…10 and 12;Li et al, 2006a;Zhang et al, 2011) were generated in a continental arc environment related to the initial subduction of the Paleo-Pacific oceanic plate beneath South China . However, Wang et al (2007d) and Zhang et al (2011) suggest that the Middle Permian-Triassic evolution of South China was related to the amalgamation of the Indochina and South China Blocks as the result of Paleotethys oceanic plate subduction and subsequent continental collision. Irrespective of these different viewpoints on the Middle Permian-Triassic evolution of South China, there has been a consensus that subduction of the Paleo-Pacific Plate and associated geodynamic processes (slab foundering or roll back or back-arc extension) played an important role in the Jurassic-Cretaceous evolution of the area (e.g., Xu et al, 1999a;Zhou and Li, 2000;Wang et al, 2005b;Zhou et al, 2006a;Li et al, 2006a;Jiang et al, 2009Jiang et al, , 2011He et al, 2010;Zhao et al, 2012).…”