RT Journal Article
T1 Electron microscopic study of the illite–smectite transformation in the bentonitesfrom Cerro del Aguila (Toledo, Spain)
A1 Santiago Buey, Cristina de
A1 Súarez Barrios, Mercedes
A1 García Romero, Emilia
A1 Domínguez Díaz, M.C.
A1 Doval, Mercedes
AB A mineralogical and microstructural study of bentonites from ‘Cerro del Aguila’located in the Tagus Basin (Toledo, Spain) was carried out using XRD, SEM and TEM observationsand chemical data obtained by TEM-EDX. The bentonites are mainly composed of trioctahedralsmectite with a unit-cell formula (Si3.76Al0.24)(Al0.44Fe3+0.26Mg1.81)Ca0.05K0.19O10(OH)2 and smallamounts of illite. The relationships between illite and smectite particles observed by SEM and TEMallowed the study of the weathering process of illite to form smectite through possible intermediatestages. The transformation begins as an exfoliation normal to the stacking direction and develops byopening of the interlayer spacing, the replacement of K+ by hydrated interlayer cations and slightreorganization of the 2:1 layer structure. The so-called solid-state transformation process thenproceeds by further dissolution and the formation of a colloidal phase acting as raw material in thegrowth of new phyllosilicates such as smectite.
PB Mineralogical Society / Blackwell Scientific publications
SN 0009-8558
YR 1998
FD 1998
LK https://hdl.handle.net/20.500.14352/58536
UL https://hdl.handle.net/20.500.14352/58536
LA eng
DS Docta Complutense
RD 2 may 2024