Permian high Ti/Y basalts from the eastern part of the Emeishan Large Igneous Province, southwestern China: Petrogenesis and tectonic implications

Origin of Permian extremely high Ti/Y mafic lavas and dykes from Western Guangxi, SW China: Implications for the Emeishan mantle plume magmatism

“…These subzones correspond to the convergence belt of the three main sub-blocks surrounding the ELIP, which are the Songpan-Ganzi Block, Yangtze Block and Chuan Dian Block (He et al, 2009(He et al, , 2006(He et al, , 2003Xu et al, 2001Xu et al, , 2004Xu et al, , 2007b. The inner and intermediate (or central) zones are characterized by low-Ti or Ti/Y basalts overlain by high-Ti or Ti/Y basalts whereas the outer zone consists of high-Ti or Ti/Y basalts (Fan et al, 2008;Hanski et al, 2010Hanski et al, , 2004Lai et al, 2012;Wang et al, 2014Wang et al, , 2011Wang et al, , 2007Zhou et al, 2006).…”

“…Ali et al, 2005;Chen et al, 2015;Shellnutt, 2014;Shellnutt and Jahn, 2011;Song et al, 2001;Wang et al, 2007Wang et al, , 2014Xu et al, 2001Xu et al, , 2004Xu et al, , 2007bXu et al, , 2013Zhang et al, 2006). Moreover, geochronological studies, e.g., SHRIMP and LA-ICP-MS U-Pb dating, give these mafic rocks a 259-263 Ma age (Fan et al, 2004(Fan et al, , 2008Lai et al, 2012;Zhang and Xiao, 2014;Zhou et al, 2006), indicating that they are spatially and temporally associated with the ELIP and/or the ELIP extends over a broader region than previously thought (Fan et al, 2004(Fan et al, , 2008Guo et al, 2014;Huang et al, 2014;Lai et al, 2012;Liu et al, 2014a). However, more detailed geochemical and isotopic data are needed to verify the proposed relationship of these mafic rocks with the ELIP.…”

“…Fan et al, 2008;Lai et al, 2012;Wang et al, 2007Wang et al, , 2014Xiao et al, 2004;Xu et al, 2001Xu et al, , 2004Zhou et al, 2008Zhou et al, , 2006. Such a radial geographic distribution of the ELIP basalts leads to a speculation that there is a consistent spatial, temporal and chemical relationship between the two basalt groups, where the high-Ti basalts are mostly located in the outer zone and the low-Ti basalts are mostly located in the central zone (Fan et al, 2008;Lai et al, 2012;Xiao et al, 2004;Xu et al, 2001Xu et al, , 2004. However, the presence of some high-Ti basalts in the inner zone is problematic Shellnutt and Jahn, 2011;Xu et al, 2001;Zhang et al, 2006;Zhou et al, 2008).…”

“…These mafic rocks, however, are increasingly being recognized as a regional effect of the impingement of the Emeishan mantle plume. The mafic rocks may be the peripheral expression of the ELIP magmatism (Fan et al, 2004(Fan et al, , 2008Guo et al, 2014;Huang et al, 2014;Lai et al, 2012;Liu et al, 2014a) as geochemical studies have revealed that the mafic flows and dikes exposed in western Guangxi resemble the ELIP high-Ti basalts (e.g. Ali et al, 2005;Chen et al, 2015;Shellnutt, 2014;Shellnutt and Jahn, 2011;Song et al, 2001;Wang et al, 2007Wang et al, , 2014Xu et al, 2001Xu et al, , 2004Xu et al, , 2007bXu et al, , 2013Zhang et al, 2006).…”

Igneous Rock Associations 16. The Late Permian Emeishan Large Igneous Province

“…The early themes of Emeishan basalt studies focused on their division into high-and low-Ti groups and their spatial-temporal distribution (Xu et al 2001;Song et al 2001;Xiao et al 2004;He et al 2010;Lai et al 2012). The division into 'high-Ti' and 'low-Ti' groups corresponded to a petrological distinction as the 'high-Ti' (i.e.…”