Abstract：The Permian nodular，striped and lump siliceous rock widely distribute in the upper of Maokou Formation and the whole Wujiaping Formation，intercalate between or in the limestone succession，in the eastern Sichuan Province.The authors research the mechanism of origin and the resource of silicon for the siliceous rock by the lithological and geochemical characteristics from the outcrop，rock thin section，major element，trace element and REE，based on the Guangyuan，Wangcang，Xuanhan and Wuxi Sections.The results indicate that shape of siliceous rock is diversified，distribute heterogeneously，and the lump siliceous rock contain limestone cakes.The silicon of the siliceous rock is primary chalcedony and microcrystal quartz，the chalcedony of calcareous-siliceous intrude into the calcite，and several bioclast silicificated.Major element analysis indicates SiO2 is the main chemical composition(52.79％～99.21％，avg 85.18％)，some major element ratios of Fe/Ti，(Fe+Mn)/Ti，Al/(Al+Fe+Mn)reflect the formation of siliceous rock is associated with the hydrotherm activities.Trace element suggests different content from the crust，some trace element ratios including Co/Ni，Th/U are relatively lower.The REE is lower，Ce is negative anomalies，LREE/HREE is lower and the δEu is relatively high.All these features above suggest that the origin of this siliceous rock we investigate is metasomatosis，the hydrotherm is primary source of silicon，the basalt leaching and upwelling is secondary.Multiple sources following with the carbonate sediments deposit through contemporaneous faults，surface leaching and upwelling，and then metasomatose the carbonate sediments during the diagenesis，finally form the nodular，striped and lump siliceous rock between or in the surrounding rocks.
Zhou Xinping,He Youbin,Luo Jinxiong et al. Origin of the Permian nodular，striped and lump siliceous rock in eastern Sichuan Province[J]. JOPC, 2012, 14(2): 143-154.
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