“…This does not differ greatly from Mao et al's (2007) two stages of W-Sn mineralization in the region: Late Jurassic-Early Cretaceous or 165-150 Ma, and Mid-Cretaceous or 130-90 Ma. A recently increasing number of isotopic datings define an accurately narrow age interval of 165-145 Ma, for a majority of W-Sn deposits there, which are in correspondence with intense Late Jurassic magmatic activity (Table 5) (Li et al, 1996(Li et al, , 2014aPeng et al, 2006;Fu et al, 2007Fu et al, , 2008Feng et al, 2007aFeng et al, , 2007bTan et al, 2007;Yao et al, 2007;Yuan et al, 2007Yuan et al, , 2012Liu et al, 2008bLiu et al, , 2012Yang et al, 2009aYang et al, , 2009bZhang et al, 2009;Zou et al, 2009;Wang et al, 2010a;Zhai et al, 2010;Guo et al, 2011;Qi et al, 2012). The close relationship between the Xitian deposit and the Early Yanshanian granites, as discussed in the previous subsection, is a good example of this relationship.…”