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A hydrothermal clay mineral assemblage at the Late Proterozoic unconformity in the Buenos Aires Complex – La Tinta Formation, Barker area, Tandilia Ranges (Argentina)

Published online by Cambridge University Press:  09 July 2018

J. C. Martínez ,
J. A. Dristas ,
H.-J. Massonne  and
T. Theye
J. C. Martínez*
Affiliation:
CONICET-INGEOSUR and Departamento de Geología, San Juan 670, UNS, Bahía Blanca, 8000, Argentina
J. A. Dristas
Affiliation:
CIC, INGEOSUR and Departamento de Geología, San Juan 670, UNS, Bahía Blanca, 8000, Argentina
H.-J. Massonne
Affiliation:
Institut für Mineralogie und Kristallchemie, Universität Stuttgart, Azenbergstrasse 18, D-70174, Germany
T. Theye
Affiliation:
Institut für Mineralogie und Kristallchemie, Universität Stuttgart, Azenbergstrasse 18, D-70174, Germany
*
*E-mail: [email protected]
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Abstract

A general alteration pattern of two transitional clay mineral assemblages was determined by petrography and X-ray diffractometry studies at the Tandilia Late Proterozoic unconformity zone, around the Barker locality: (1) K-white mica + chlorite + calcite ± anatase-rutile ± secondary quartz (farther from the unconformity) and (2) pyrophyllite + K-white mica + Ti-rich hematite ± aluminium phosphate-sulphate minerals ± tourmaline ± anatase-rutile (closer to the unconformity). The local occurrence of Na in K-white micas and K-Na in pyrophyllite is described for the first time. Possible interlayering with intermediate K-Na mica and paragonite is indicated by detailed X-ray diffraction analyses. A negative Eu anomaly (Eu/Eu* = 0.24), strongly positive Eu anomaly (Eu/Eu* =11.7) and positive Ce anomaly characterized rapid changes from an unaltered basement to the most altered basement and sedimentary rocks at the unconformity. Aluminium phosphate-sulphate minerals dominate patterns of LREE. A model of hydrothermal alteration comparable to that of unconformity-related uranium deposits is presented.

Keywords

Late-Proterozoic unconformityclay mineral assemblagehydrothermal alterationBarker areaArgentina
Type
Research Article
Information
Clay Minerals , Volume 45 , Issue 2 , June 2010 , pp. 209 - 224
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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