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用不同溶样方法、国外实验室检验对比和同位素稀释质谱法确定了河北省东坪水泉沟钾长石化-硅化碱性正长岩具有MW复合型(MW型)稀土四分组效应,这是M型与W型同时存在的一种新类型的稀土四分组效应.对这种岩石中磷灰石和锆石进行了单颗粒矿物稀土定量分析,稀土组成特点一致显示了熔体结晶(岩浆)及热液流体交代叠加作用的特点,并可能至少有两期热液活动.熔体-流体共存及富Cl,CO2和Si,K,Al,高温、中低盐度流体热液流体交代蚀变作用的叠加是形成MW复合型稀土四分组效应的主要控制因素.MW复合型稀土四分组效应可作为岩体改造型Au矿的成矿标志。
Using different sample-dissolving methods, foreign laboratory tests and isotope dilution-mass spectrometry, we found that the K-feldspar-silicification alkaline syenite in Shuiquangou, Dongping, Hebei Province has the MW grouping type (MW type) A new type of rare earth quaternary grouping coexist with type W. A quantitative analysis of single grain mineral rare earths has been performed on apatite and zircon in this rock.The composition of rare earth is consistent with the results of melt crystallization (magma) and Hydrothermal fluid metasomatic superimposition and may have at least two phases of hydrothermal activity. Melt-fluid coexistence and hydrothermal alteration of Cl, CO2, and Si, K, Al, high-temperature and medium-salinity hydrothermal fluids Is the main controlling factor for the formation of MW composite rare earth quaternary grouping effect.MW composite rare earth quaternary grouping effect can be used as the mineralization sign of the rock remodeling Au ore.