K-Ar AND Rb-Sr DATING OF NANOMETER-SIZED SMECTITE-RICH MIXED LAYERS FROM BENTONITE BEDS OF THE CAMPOS BASIN (RIO DE JANE
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K-Ar AND Rb-Sr DATING OF NANOMETER-SIZED SMECTITE-RICH MIXED LAYERS FROM BENTONITE BEDS OF THE CAMPOS BASIN (RIO DE JANEIRO STATE, BRAZIL) NORBERT CLAUER1 *, JAN ŚRODOŃ2, AMÉLIE AUBERT3, I. TONGUÇ UYSAL4, AND THEOFILOS TOULKERIDIS5 1
Institut de Physique du Globe de Strasbourg, Université de Strasbourg (UdS-CNRS), 1 Rue Blessig, 67084 Strasbourg, France 2 Institute of Geological Sciences, Polish Academy of Sciences, 31-002 Kraków, Poland 3 Laboratoire d’Hydrologie et de Géochimie de Strasbourg, Université de Strasbourg (UdS-CNRS), 1 rue Blessig, 67084 Strasbourg, France 4 Geological Engineering Department, Ankara University, Gölbaşı, Ankara, Turkey 5 Universidad de las Fuerzas Armadas ESPE, Av. General Ruminahui, Sangolqui, Ecuador
Abstract—K-Ar isotopic dating has been applied to alkali-rich nanometer-sized illite separates of bentonites since the late 1990s. In the present study, K-Ar and Rb-Sr isotopic analyses were based on mineralogical determinations and morphological observations of similarly nm-sized separates (
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