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Norbert Clauer, Edward Keppens, I. Tonguç Uysal and Amélie Aubert
A combined ultrasonic treatment, with de-ionized H2O, dilute HAc or dilute HCl, of three Mid-Miocene glauconite samples was applied to K?Ar date the different separates in order to compare the results with those obtained by the Rb?Sr method using the sam...
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Alvaro Rodrigo Iriarte,Umberto Giuseppe Cordani,Kei Sato
Pág. 403 - 441
The Cordillera Real granitoids are a suite of Triassic and Oligocene plutons in the core of the Eastern Cordillera of the Central Andes of Bolivia. Their tectonic setting, chemical and ore compositions make them part of the so-called ?Inner Magmatic Arc?...
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Norbert Clauer
Previously published K-Ar dating results of <2 µm illite separates from uranium-hosting and associated barren rocks from Dominique Peter district of the Carswell circular structure in the Athabasca Basin (Canada) were considered to trace four distinct te...
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Mauro Ignacio Bernardi,Gustavo Walter Bertotto,Yuji Orihashi,Hirochika Sumino,Alexis Daniel Ponce
Pág. 490 - 525
The basaltic lava flows located in the southeast of Payenia Volcanic Province, Argentina, show lengths between 40 and 181 km. These flows have transversal sections characterized by external vesicular crusts that surround a massive core hosting vesiculate...
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Frithjof Bense, Carlos Costa, Sebastián Oriolo, Stefan Löbens, Istvan Dunkl, Klaus Wemmer, Siegfried Siegesmund
Pág. 275 - 306
This paper presents low-temperature thermochronological data and K-Ar fault gouge ages from the Sierra
de San Luis in the Eastern Sierras Pampeanas in order to constrain its low-temperature thermal evolution and exhumation
history. Thermal modelling base...
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Viviana Olivares,Jose Cembrano,Gloria Arancibia,Nicolas Reyes,Veronica Herrera,Daniel Faulkner
Pág. 473 - 497
The Caleta Coloso Duplex is a brittle strike-slip structure developed along the Atacama Fault System during the Early Cretaceous. A hydrothermal vein system existing within the duplex documents the nature of the link between fluid transport and progressi...
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Gilda Collo,Ricardo A. Astini,Agustin Cardona,Margarita D. Do Campo,Umberto Cordani
Pág. 191 - 214
Many of the metamorphic and deformational events associated to low-grade units in NW Argentina have been linked with ancient orogenies, like the Pampean (Cambrian) and the Ocloyic (Ordovician) cycles. The lack of specific ages in the low-grade metamorphi...
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Paul Duhart,Alberto C. Adriasola
The Coastal Ranges in the western part of the Chiloé Archipelago represent an emerged forearc high at the subduction front of south-central Chile. Prior to the Cenozoic framework of the subducting Farallón and Nazca plates beneath the South American plat...
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Ricardo Varela,Miguel A.S. Basei,Carlos A. Cingolani,Oswaldo Siga Jr.,Claudia R. Passarelli
Isotopic data are presented for rocks of the Andean crystalline basement at 40°S, in Neuquén and Río Negro provinces. The methods used were U-Pb in zircon (crystallization ages of plutonic rocks), K-Ar in micas and U-Pb in titanite (metamorphism and cool...
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Yuji Orihashi,Jose A. Naranjo,Akihisa Motoki,Hirochika Sumino,Daiji Hirata,Ryo Anma,Keisuke Nagao
Pág. 207 - 224
Twenty-nine K-Ar ages for lavas and juvenile ejecta obtained from Hudson volcano in the southern end of the Southern Volcanic Zone and Lautaro volcano in the northern end of the Austral Volcanic Zone, which are separated by a 350 km-long volcanic gap nea...
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