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Clay Minerals; December 2005; v. 40; no. 4; p. 565-580; DOI: 10.1180/0009855054040193
© 2005 Mineralogical Society of Great Britain and Ireland
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Research Paper

Mineralogical and trace element composition of clay-sized fractions from Albian siliciclastic rocks (Oliete Basin, NE Spain)

J. M. GONZÁLEZ LÓPEZ, B. BAULUZ*, A. YUSTE, M. J. MAYAYO and C. FERNÁNDEZ-NIETO

Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50.009, Zaragoza, Spain

* E-mail: bauluz{at}unizar.es

(Received 10 May 2005; revised 7 October 2005)

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

KEYWORDS: clay fractions, geochemistry, heavy minerals, illite, kaolinite, mineralogy, trace elements






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