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Stella Poma, Adriana Ramos, Vanesa D. Litvak, Sonia Quenardelle, Emma B. Maisonnave, Iris Díaz
Pág. 249 - 274
A Miocene to Pliocene (13 to 4.6 Ma) mostly pyroclastic sequence is exposed along the Iglesia Valley, to
the east of the former main volcanic arc. This area is a transitional region between Cordillera Frontal and Precordillera,
over the flat slab segment...
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Alfonso Encinas,Wolfgang Stinnesbeck,Victor A. Valencia
Pág. 436 - 445
Upper Cretaceous marine rocks crop out along the Pacific coast of central and south-central Chile between 33° and 37°S. These strata constitute an important reference for the Upper Cretaceous of South America due to their diverse fossil fauna and flora. ...
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Rodrigo A. Otero,Teresa Torres,Jacobus P. Le Roux,Francisco Herve,C.Mark Fanning,Roberto E. Yury-Yanez,David Rubilar-Rogers
Pág. 180 - 200
We present new data on the paleoichthyology, paleobotany and radiometric results of the Loreto Formation in the Brunswick Peninsula of southernmost Chile, that allow us to propose a Late Eocene age. The rich diversity of fossil cartilaginous fishes (Chon...
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Reinhard Werner, Boris Baranov, Kaj Hoernle, Paul van den Bogaard, Folkmar Hauff and Igor Tararin
Here we present the first radiometric age and geochemical (major and trace element and isotope) data for samples from the Hydrographer Ridge, a back arc volcano of the Kurile Island Arc, and a newly discovered chain of volcanoes (?Sonne Volcanoes?) on th...
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María Teresa Dozo,Martín Ciancio,Pablo José Bouza,Gastón Martínez
Pág. 224 - 247
The continental fossil mammals found in Barrancas Blancas, (near Camarones, Southeast of Chubut Province, Argentina) constitute a new faunal association from the Paleogene of Patagonia. From the base to the top, the outcrop in this locality is composed o...
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Maria Mardones,Liubow Gonzalez,Robert King,Eduardo Campos
Pág. 371 - 392
During the Holocene, the patagonian glaciers were characterized by geomorphologically registered advances and retreats. This paper presents the geomorphological evolution and evidences of Holocene glacial advances within a segment in Central Patagonia Co...
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Alejandro Sanchez,Polina Pavlishina,Estanislao Godoy,Francisco Herve,Mark Fanning
Pág. 413 - 432
On the west coast of Tierra del Fuego, south of Cabo Nariz, in Chile, Upper Cretaceous to Paleocene sedirnentary successions of the Magallanes foreland basin crop out. The presence of dinoflagellate cysts, as well as radiometric U-Pb SHRIMP dating of det...
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Marcia Munoz,Francisco Fuentes,Mario Vergara,Luis Aguirre,Jan Olov Nyström,Gilbert Feraud,Alain Demant
Pág. 109 - 140
The stratigraphy, chemistry and age of rocks assigned to the eastern portion of the Abanico Formation exposed along the El Volcán river valley, Principal Cordillera east of Santiago (30º50'S/70º12'-70º5'W), are reported and discussed. This ca. 3,300 m th...
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Andrea F. Sterren,Gabriela A. Cisterna,Óscar López-Gamundí,María M. Vergel
Pág. 110 - 124
The Agua del Jagüel Formation crops out in the southernmost part of the Calingasta-Uspallata basin, in central western Argentina. The lower part of the unit is characterized by a glacigenic sequence with diamictites and mudstones with dropstones. In the ...
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Nadia Mohammadi, Christopher R. M. McFarlane and David R. Lentz
A combination of in situ laser ablation inductively coupled plasma?mass spectrometry (LA ICP?MS) analyses guided by Scanning Electron Microscope?Back-Scattered Electron imaging (SEM?BSE) was applied to hydrothermal monazite from greisen veins of the Late...
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Geoffrey May,Adrian J. Hartley,Guillermo Chong,Fin Stuart,Peter Turner,Stephanie J. Kape
Pág. 33 - 58
New 40Ar/39Ar radiometric, sedimentological and structural data from post-Paleocene sedimentary strata in the Calama Basin, northern Chile suggest that the established lithostratigraphy of the basin-fill requires revision. A new lithostratigraphic scheme...
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Natalie Romeuf,Luis Aguirre,Pierre Soler,Gilbert Feraud,Etienne Jaillard,Gilles Ruffet
Pág. 245 - 259
ABSTRACT. Stratigraphical, petrographical, geochronological and geochemical data available suggest that the various segments of the western margin of South America experienced a different geodynamic evolution throughout the Jurassic_ In the early Jurassi...
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Natalie Romeuf,Luis Aguirre,Pierre Soler,Gilbert Feraud,Etienne Jaillard,Gilles Ruffet
Pág. 245 - 259
ABSTRACT. Stratigraphical, petrographical, geochronological and geochemical data available suggest that the various segments of the western margin of South America experienced a different geodynamic evolution throughout the Jurassic_ In the early Jurassi...
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Estanislao Godoy,Werner Loske
Pág. 119 - 127
RESUMEN. Tres fracciones granulometricas de circones en una diorita de dos piroxenos (charnoquita 'precambrica' segun estudios anteriores), que aflora en Laguna Verde, y dos fracciones de su equivalente neisico de Punta Curaumilla, indicaron edades conco...
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Lev V. Eppelbaum, Youri I. Katz and Zvi Ben-Avraham
The Easternmost Mediterranean is a transition region from the ocean to the continent where the spreading and collision zones of the lithospheric plates join. The methodology of paleomagnetic mapping of the transition zones is based on combining geologica...
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Peter K. Bijl,G. Raquel Guerstein,Edgar A. Sanmiguel Jaimes,Appy Sluijs,Silvio Casadio,Victor Valencia,Cecilia R. Amenábar,Alfonso Encinas
Pág. 185 - 218
The tectonic opening of the Tasmanian Gateway and Drake Passage represented crucial geographic requirements for the Cenozoic development of the Antarctic Circumpolar Current (ACC). Particularly the tectonic complexity of Drake Passage has hampered the ex...
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Giovanni Zanchetta,Marta Pappalardo,Alessio Di Roberto,Monica Bini,Ilenia Arienzo,Ilaria Isola,Adriano Ribolini,Gabriella Boretto,Enrique Fuck,Daniela Mele,Massimo D?Orazio,Fabio Marzaioli,Isabella Passariello
Pág. 267 - 280
In this paper we illustrate the stratigraphy, geochronology, and geochemistry (major, minor, trace elements and Sr-isotopes) of a Holocene tephra layer found within coastal sedimentary deposits north of Caleta Olivia (Santa Cruz Province, Argentina). The...
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Pamela Jara,Reynaldo Charrier
Pág. 174 - 209
New stratigraphical and geochronological constraints for the Mezo-Cenozoic deposits in the High Andes of central Chile between 32° and 32°30?S: Structural and palaeogeographic implications. Attempts to differentiate geological units of the Andean Princip...
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Alberto Garrido,Alejandro Kramarz,Analía Forasiepi,Mariano Bond
Pág. 482 - 510
We present here the recent advances in understanding the stratigraphy and age of the Cenozoic volcanic and sedimentary sequences exposed on the area of sierra Huantraico ? sierra Negra and cerro Villegas (Pehuenches Department, Neuquén Province). Stratig...
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