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Abstract:

The Palaeogene Maíz Gordo Formation is one of the main lacustrine events recorded in northwestern Argentina. It consists of sandstone, mudstone, and limestone beds 200 m thick, deposited in a brackish-alkaline lake and braided alluvial systems. The Maíz Gordo Lake evolved mainly as a closed system, with brief periods as an open one. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study samples from seven sites, corresponding respectively to proximal, intermediate, and transitional positions of the fluvial environment and marginal and inner-lake environment, focusing on the clay mineralogy and analcime formation. The basinward zonation of diagenetic minerals identified in the Maíz Gordo Lake was: mordenite → analcime → K-feldspar. Although not a typical zonation of saline-alkaline lakes, it does indicate an increase in salinity and alkalinity towards the centre. In proximal fluvial settings, smectite predominates at the base of the sequence, with scarce kaolinite. Towards the top, a striking increase in kaolinite content suggests a change from a relatively arid climate with alternating humid and dry seasons, towards a warm and humid climate. Kaolinite content clearly decreases in a basinward direction. Such a variation is attributable to changes in hydro-geochemistry, denoting the progressive influence of the brackish and alkaline lake water on interstitial pores. SEM images of intermediate fluvial samples reveal authigenesis of illite at the expense of kaolinite booklets. In littoral and inner-lake settings the clay fraction is composed of muscovite, sometimes with subordinate smectite. Analcime occurs in variable amounts in all sedimentary facies, in rock pores or filling veins. It forms subhedral square to hexagonal, or anhedral rounded crystals, denoting that they coarsened at low to moderate degrees of supersaturation. Although the mordenite identified in a fluvial level would have been the precursor of analcime in the Maíz Gordo Basin, no textural evidence of analcime formation through replacement of mordenite or other precursor zeolite was found. Hence it is more probable that analcime formation took place by direct authigenic precipitation or through the reaction between interstitial brines and clay minerals or plagioclase. © 2007 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Clay mineral assemblages and analcime formation in a Palaeogene fluvial-lacustrine sequence (Maíz Gordo Formation Palaeogen) from northwestern Argentina
Autor:Do Campo, M.; del Papa, C.; Jiménez-Millán, J.; Nieto, F.
Filiación:INGEIS, Departamento de Geología, FCEN (CONICET - UBA), Pab. INGEIS, (1428) Buenos Aires, Argentina
CONICET-Facultad de Ciencias Naturales, Universidad Nacional de Salta, Buenos Aires 177, 4400 Salta, Argentina
Departamento de Geología, Universidad de Jaén, 23071 Jaén, Spain
Departamento de Mineralogía y Petrología, I.A.C.T., Universidad de Granada-CSIC, Avda. Fuentenueva s/n, 18002 Granada, Spain
Palabras clave:Alkaline lakes; Analcime; Argentina; Kaolinite; Palaeogene; X-ray diffraction; analcime; clay mineral; diagenesis; kaolinite; Paleogene; scanning electron microscopy; X-ray diffraction; Argentina; South America
Año:2007
Volumen:201
Número:1-2
Página de inicio:56
Página de fin:74
DOI: http://dx.doi.org/10.1016/j.sedgeo.2007.04.007
Título revista:Sedimentary Geology
Título revista abreviado:Sediment. Geol.
ISSN:00370738
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00370738_v201_n1-2_p56_DoCampo

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Citas:

---------- APA ----------
Do Campo, M., del Papa, C., Jiménez-Millán, J. & Nieto, F. (2007) . Clay mineral assemblages and analcime formation in a Palaeogene fluvial-lacustrine sequence (Maíz Gordo Formation Palaeogen) from northwestern Argentina. Sedimentary Geology, 201(1-2), 56-74.
http://dx.doi.org/10.1016/j.sedgeo.2007.04.007
---------- CHICAGO ----------
Do Campo, M., del Papa, C., Jiménez-Millán, J., Nieto, F. "Clay mineral assemblages and analcime formation in a Palaeogene fluvial-lacustrine sequence (Maíz Gordo Formation Palaeogen) from northwestern Argentina" . Sedimentary Geology 201, no. 1-2 (2007) : 56-74.
http://dx.doi.org/10.1016/j.sedgeo.2007.04.007
---------- MLA ----------
Do Campo, M., del Papa, C., Jiménez-Millán, J., Nieto, F. "Clay mineral assemblages and analcime formation in a Palaeogene fluvial-lacustrine sequence (Maíz Gordo Formation Palaeogen) from northwestern Argentina" . Sedimentary Geology, vol. 201, no. 1-2, 2007, pp. 56-74.
http://dx.doi.org/10.1016/j.sedgeo.2007.04.007
---------- VANCOUVER ----------
Do Campo, M., del Papa, C., Jiménez-Millán, J., Nieto, F. Clay mineral assemblages and analcime formation in a Palaeogene fluvial-lacustrine sequence (Maíz Gordo Formation Palaeogen) from northwestern Argentina. Sediment. Geol. 2007;201(1-2):56-74.
http://dx.doi.org/10.1016/j.sedgeo.2007.04.007