Trace Element Geochemistry of Devonian Strata in the Shizhuyuan Ore District, Hunan Province

Both the Qiziqiao Formation and Shetianqiao Formation, which controls the occurrence and distribution of a great deal of metal mineral resources, are extensively developed in southern Hunan province (Liu et al., 1998), showing quite important indicative significance to deep concealed metal mineral resources (Yu et al., 2003). The geochemistry characteristics of Devonian strata could not affect the spatial occurrence shape of orebody (Wang et al., 2014; Zhai et al., 2014), but also determined the reserve of W-Sn-Mo-Bi polymetallic mineral resources (Li et al., 2011; Zaw et al., 2014). Especially, the surrounding rock is one of the important clues to the deep geological prospecting, and it is essential to study the geochemistry of the Qiziqiao Formation and Shetianqiao Formation. * In southern Hunan province, the Qiziqiao Formation can be divided into four types of lithological association sequences (Lu et al., 2003), including limestone-dolomite, argillaceous limestone-marl, dolomite and limestone, among which the limestone-dolomite lithological association is most widely distributed, such as Daoxian and Linwu. And, the argillaceous limestone-marl lithological association mainly occurred in Xintian and Lingling with zonal distribution; the dolomite distributed in the border between Hunan and Guangxi; the limestone distributed in the border between Hunan and Jiangxi (Cheng et al., 2012; Cheng et al., 2014). The basal boundary of Qiziqiao Formation is clear that is characterized by the disappearing of siltstone, quartz sandstone and the occurrence of marl, limestone, or dolomite; yet the top boundary is different in different