The Geochemistry Research on Eocene Volcanic Rocks in Sanshui Basin

Guangdong Sanshui Basin evoluted with extreme volcanic activities. Eruptions between Paleocene to Eocene were concentrated on Xinzhuang, Buxin, Baoyue and Huayong formations. For realized the relationship between various kind of rocks, Geochemistry analysis such as multi-element and rare-earth element determination were launched on Basalt, Trachyte and Rhyolite samples from the research area. Geochemistry diagram suggest that: REE distribution of Basalt followed as mid-plate alkali Basalt mode, while their trace element spider diagrams act as continental alkali Basalt with Nb, Ti rich and Sr loss. REE distribution of Trachyte and Rhyolite are similar, which indicate the same crystalization separation process. S-B diagram and Pearce diagram show that: Granite were partial melted from source region, while Trachyte in ZMY and Rhyolite in LBS originated from the same source region, and occur with the process of crystallization separation with plagioclase adventage.