四川会理小青山铜（金）矿钠长石英板岩的发现及其意义

四川会理小青山铜（金）矿区的钠长石英板岩主要由钠长石及石英组成。钠长石英板岩的化学成分中富有ＳｉＯ２，Ａｌ２Ｏ３及Ｎａ２Ｏ，贫Ｋ２Ｏ，ＦｅＯ及ＭｇＯ；稀土元素特征为：ΣＲＥＥ＝３０１３－４２．１１，ΣＣｅ／ΣＹ＝１．８０－１．９８，δＥｕ＝０．２３－０．３４，δＣｅ＝０．４８－０．５９。

The Discovery of Adinole in the Xiaoqingshan Copper (Gold) Deposit,Huili County, Sichuan Province

Na-metasomatic rocks in Xiaoqingshan, Huili County, Sichuan Province, have been recognized as adinoles. The rocks are distributed along major faults or adjacent to small mafic intrusions. The protolith of adinoles is metapelites, such as seriscite phyllite and carbonaceous slate. The adinoles consist of albite. quartz and minor tourmaline and rutile. They are characterized by various kinds of metsomatic textures. Most of the rocks were superposed by late alteration marked by the assemblage of carbonate-chlorite-pyrite-auriferous chalcopyrite. Mass balance calculation indicates that K2O, MgO, Fe2O, FeO, Rb, Ba and REE were removed from the metapelites, while Na2O and SiO2 were added. In contrast, A12O3 was almost immobile. It is important that Cu (Au) mineralization occurred during the metasomatisms. The authors suggest that alkaline fluids from the deep levels were responsible for the Na and late-stage metasomatism and mineralization during the extension of the crust.