Mineralogical and trace element composition of clay-sized fractions from Albian siliciclastic rocks (Oliete Basin, NE Spain)
作者： J. M. González López , B. Bauluz , A. Yuste , M. J. Mayayo , C. Fernández-Nieto
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摘要: Mineralogical and geochemical techniques have been used to determine the role of minerals in controlling trace element composition a set clay-sized fractions from Albian siliciclastic rocks NE Spain. These are composed kaolinite illite, minor quantities quartz, accessory heavy minerals. Kaolinite has smaller crystal size than accounting for its relative concentration these fractions. The μm-sized rutile, Fe-Ti- Fe-oxides, zircon, pyrite, cassiterite, monazite xenotime. Geochemical data indicate that most elements relatively concentrated fractions, except Zr, Hf, Y HREE. Statistical treatment shows three different associations fractions: (1) Rb, Cs Ba with clay phyllosilicates, especially illite; (2) REE Th, P phases; (3) Sc, Cr V Ti- Nb oxides. Therefore, do not support dominant control by mineralogy other authors reported.
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