Two episodes of the Indosinian thermal event on the South China Block: Constraints from LA-ICPMS U–Pb zircon and electron microprobe monazite ages of the Darongshan S-type granitic suite

Origin of the granulite enclaves in Indo-Sinian peraluminous granites, South China and its implication for crustal anatexis

“…It was ever a part of the QinFang Trough in the Paleozoic, and during this period voluminous sediments with a thickness of 21-25 km were deposited (BGMRGX, 1985). The closure of the Qin-Fang Trough occurred by the end of Permian, and this triggered regional deformation and metamorphism (Chen et al, 2011;Wang et al, 2007;Zhao et al, 2010Zhao et al, , 2011. Subsequent melting of the metasedimentary protoliths formed the widespread peraluminous granites at 240-230 Ma (Chen et al, 2011;Deng, 2003;Deng et al, 2004;Zhao et al, 2011).…”

“…Following the closure of the Paleo-Tethys along the Song-Ma suture and the subsequent collision between the SCB and the Indochina block Trung et al, 2006), this marine trough was ultimately closed by the 1985). Because of its special tectonic locality, this granite belt has been considered to be a particularly useful location for probing into the Indo-Sinian orogeny related to the collision between the Indochina block and SCB (Chen et al, 2011).…”

“…Metasedimentary granulite enclaves are abundant in the Indo-Sinian peraluminous granites from the DSGB. In recent years, many papers have been published discussing the origin of these granites (e.g., Charoy and Barbey, 2008;Chen et al, 1995Chen et al, , 2011Deng, 2003;Deng et al, 2004;Fang, 1989;Hsieh et al, 2008;Peng et al, 2004;Qi et al, 2007;Zhao et al, 2010Zhao et al, , 2011, and their hosting granulite enclaves (e.g., Du et al, 1999;Pang, 2001;Peng, 2006;Peng et al, 2004;Wang, 1987;Zhao et al, 2010Zhao et al, , 2011. Two possible tectonic settings of the granitic magmatism have been proposed: (1) anatexic products formed during continental collision (e.g., Chen et al, 1995Chen et al, , 2011Deng, 2003;Deng et al, 2004;Fang, 1989;Hsieh et al, 2008;Qi et al, 2007); and (2) crustal melts of post-collisional extension (e.g., Charoy and Barbey, 2008;Peng et al, 2004;Zhao et al, 2010Zhao et al, , 2011.…”

“…Peng (2006) reported that the peak metamorphic temperature for the granulite enclaves exceeded 1000°C. Based on zircon and monazite U-Pb ages, Peng (2006), Zhao et al (2010) and Chen et al (2011) proposed that the origin of the granulite enclaves was genetically related to the Emeishan plume activity. Yet, debate continues about the P-T conditions of the granulite-facies metamorphism, the relationship between the granulite enclaves and the host granites and the causes for the extensive crustal anatexis.…”

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.…”