Large-scale Early Cretaceous volcanic events in the northern Great Xing'an Range, Northeastern China

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

“…Nevertheless, the large rang in crystallization age of the volcanic rocks in the four volcanic formations show a climax in the Early Cretaceous, consistent with the giant igneous event recognized in other parts of NE China (Jahn, 2004;Wu et al, 2005;Yang and Li, 2008;Yang et al, 2014b). Compared with the volcanic strata in the southern segment of GXM, the volcanic rocks in the northern region have relatively high contents of alkalis and much more mafic in compositional for the basalt and basaltic andesite of the Tamulangou Formation (Zhang et al, 2008a). The initiation of volcanism across both the northern and southern regions of GXM was considered to be synchronous in the Late Jurassic (Zhang et al, 2008a.…”

“…The widespread Mesozoic volcanic rocks in the GXM were documented by numerous previous works (e.g., Wang et al, 2006;Zhang et al, 2008aZhang et al, , 2010Ying et al, 2010;Wu et al, 2011). In the southern GXM, the large-scale volcanisms in the Late Mesozoic were re-evaluated based on the systematic and high precision isotopic ages (Ying et al, 2010;Zhang et al, 2010).…”

“…Compared with the volcanic strata in the southern segment of GXM, the volcanic rocks in the northern region have relatively high contents of alkalis and much more mafic in compositional for the basalt and basaltic andesite of the Tamulangou Formation (Zhang et al, 2008a). The initiation of volcanism across both the northern and southern regions of GXM was considered to be synchronous in the Late Jurassic (Zhang et al, 2008a. The presented 127 analyses of eight samples in this study yield zircon U-Pb ages ranging from 163 ± 3 Ma to 109 ± 3 Ma with a weighted mean at 135 ± 2 Ma (Table 2), consistent with the age distribution of the giant igneous event in the whole GXM (Fig.…”

“…100,000 km 2 (Ying et al, 2010), and mainly distribute along the GXM. Numerous geological, petrological and geochronological studies were carried out on these large-scale magmatic activities (Jahn et al, 2001;Fan et al, 2003;Wu et al, 2005;Wang et al, 2006;Zhang et al, 2008aZhang et al, , 2008bZhang et al, , 2010Guo et al, 2010;Yang et al, 2013), which have not resulted in a consensus about the mechanism. There are several models has been proposed to interpret this extensive Mesozoic magmatism, including: mantle plume hypothesis (Lin et al, 1998;Ge et al, 1999), post-orogenic diffuse extension after the subduction of the Mongol-Okhotsk Ocean (Fan et al, 2003;Gao et al, 2005;Guo et al, 2010), thickened lithospheric delaminating induced by the subduction of Pacific plate (Wu et al, 2005;Wang et al, 2006;Zhang et al, 2010).…”

An early extensional event of the South China Block during the Late Mesozoic recorded by the emplacement of the Late Jurassic syntectonic Hengshan Composite Granitic Massif (Hunan, SE China)

“…This event can be observed all along the East Asia continental margin of more than 5000 km, and it extends continentwards about 1000 km in South China, and even more than 2500 km in North China, Mongolia and Siberia (e.g. Zhou and Li 2000; Ren et al, 2002;Meng, 2003;Wu et al, 2005;Wang et al, 2006;Li and Li 2007;Zhang et al, 2008;Davis and Darby, 2010;Zhou et al, 2012;Dash et al, 2015;Wang et al, 2015). Due to the representatives of this tectonic event, and the related contemporary ore deposit forming processes, the Jurassic and Cretaceous tectonic regime of the South China Block (SCB) has attracted great interest in the geological community (e.g.…”