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铜陵地区二叠系栖霞组到大隆组(P_1q—P_2d)各层位中硅质岩分布广泛。通过野外地质填图过程中的详细观察和硅质岩常量元素、稀土元素和微量元素的分析,结果表明,这些硅质岩是热水活动间歇式、多次活动的结果。硅质岩构成铜陵地区二叠系主要的矿(源)层或矿胚层(Protore)之一。硅质岩具有低 Fe_2O_3/FeO、SiO_2/Al_2O_3、SiO_2/(K_2O+Na_2O)、SiO_2/MgO、MnO_2/TiO_2 值;低 Co高 Ni,Co/Ni<1,U/Th>1;低 ∑REE,负 Ce异常,重稀土相对富集等热水沉积物的特征,为热水沉积的结果。氧同位素估算的热水古温度为49～249℃(高温部分有后期岩浆的叠加扰动)。硅质岩是铜陵地区二叠系层控矿床的重要找矿标志,对于隐伏矿床的寻找和矿产预测具有重要意义。
There are a wide range of siliceous rocks in all layers of the Permian Qixia Formation to the Dalong Formation (P_1q-P_2d) in Tongling area. Through the detailed observation of geological mapping in the field and the analysis of the elements, rare earth elements and trace elements of the cherts, the results show that these cherts are the result of intermittent and multiple activities of hot water activities. Silicalite constitutes one of the major ore-bearing (Permian) ore layers or Protore in the Tongling area. The chert is characterized by low Fe 2 O 3 / FeO, SiO 2 / Al 2 O 3, SiO 2 / (K 2 O + Na 2 O), SiO 2 / MgO and MnO 2 / TiO 2; low Co high Ni, Co / Ni <1, U / Th> 1; , Negative Ce anomaly, relative enrichment of heavy rare earths and other hydrothermal sediments, which is the result of hydrothermal deposition. Oxygen isotopes estimate the ancient hot water temperature of 49 ~ 249 ℃ (high temperature part of the late superimposed magmatic disturbance). Silicalite is an important mineral prospecting indicator of Permian stratabound deposits in Tongling area, which is of great significance to the prospecting of hidden deposits and mineral prediction.