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SEM and TEM evidence of mixed-layer illite-smectite formed by dissolutioncrystallization processes in continental Paleogene sequences in northwestern Argentina

Published online by Cambridge University Press:  02 January 2018

Margarita Do Campo ,
Blanca Bauluz ,
Fernando Nieto ,
Cecilia Del Papa  and
Fernando Hongn
Margarita Do Campo*
Affiliation:
INGEIS (CONICET – Universidad de Buenos Aires) y FCEyN - U.B.A. Pabellón INGEIS, Ciudad Universitaria (1428) Buenos Aires, Argentina
Blanca Bauluz
Affiliation:
Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50.009 Zaragoza, Spain
Fernando Nieto
Affiliation:
Departamento de Mineralogía y Petrología and I.A.C.T., Universidad de Granada-CSIC, Avda. Fuentenueva s/n, 18002-Granada, Spain
Cecilia Del Papa
Affiliation:
CICTERRA, CONICET-Universidad Nacional de Córdoba, Córdoba, Argentina
Fernando Hongn
Affiliation:
IBIGEO (CONICET-Universidad Nacional de Salta), Avda. Bolivia 5150, 4400 Salta, Argentina
*
*E-mail: [email protected]
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Abstract

In the northernmost Calchaquí Valley (Salta, Argentina), the Paleogene continental sediments show a transition from smectite, at the top, to R3 I-S (>90% illite) through R1 I-S (65–80% illite), in contrast to the remaining sectors, containing smectite up to the bottom. Samples at the base of the succession were characterized by high-quality step-scan X-ray diffraction (XRD), scanning electron microscopy (SEM) and analytical high-resolution transmission electron microscopy (HRTEM). Analysis by SEM demonstrated dissolution of primary phases (feldspars, micas and quartz) and crystallization of illite, I-S and kaolinite. As this alteration is not pervasive, an intermediate fluid/rock ratio could be inferred. The lattice-fringe images of the samples from upper parts of the sequence show abundant I1-rich areas, whereas in the lower parts of the sequence, illite packets and I3 I-S coexist and compositions evolve towards muscovite (tetrahedral-charge increase, principally compensated by Mgby- Al substitution in octahedral sites and by a slight decrease in Ca in interlayer sites). As burial temperatures were probably similar in all the samples, depth was not responsible for the illite formation at the bottom. The TEM textures suggest that illitization proceeded mainly by dissolution-crystallization. The active faults close to the northern Calchaquí Valley probably promoted the circulation of hot, deep fluids, favouring illitization.

Keywords

illite-smectitePaleogeneArgentinaSEMTEMdissolution-crystallization
Type
Research Article
Information
Clay Minerals , Volume 51 , Issue 5 , December 2016 , pp. 723 - 740
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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