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对江西龙南黑云母花岗岩风化壳中常量元素、微量元素和REE的含量、分布及迁移规律的研究发现 :风化过程中的主要矿物学变化为长石→蒙脱石 ,伊利石→高岭石 ,埃洛石→硅铝土 .活动性元素为Na ,Ca ,Si,P ,V ,U ,Sr,而Ti,Al,Fe,Sc ,Th ,Zr,Hf保持稳定 .除Zr/Hf,Nb/Ta ,Th/Sc ,Zr/Nb和Sm/Nd外 ,其他微量元素比值都发生了变化 .REE和Y在剖面内重新分布 ,风化样品稀土配分模型在继承母岩特征的同时 ,发生了一系列分异 .总体而言 ,化学风化程度是影响风化剖面中矿物成分、主要和微量元素含量、分布的关键因素 ,在根据沉积物矿物和微量元素分布研究源区特征时 ,应充分考虑到源岩化学风化的程度 .
The results show that the main mineralogical changes in the weathering process are feldspar → montmorillonite, illite → kaolinite, and trace elements in the weathering crust of Longnan biotite. Halloysite → silicoaluminum.The active elements are Na, Ca, Si, P, V, U, Sr, while Ti, Al, Fe, Sc, Th, Zr and Hf remain stable except Zr / Hf and Nb / Ta, Th / Sc, Zr / Nb and Sm / Nd, the ratios of other trace elements changed.REE and Y were redistributed in the profile, while the rare earth compounding model of weathered samples inherited the features of parent rocks and a series of In general, the degree of chemical weathering is a key factor that influences the mineral composition, major and trace element contents and distribution in the weathering profiles. When studying the characteristics of source areas based on the distribution of sedimentary minerals and trace elements, the source rock The degree of chemical weathering.