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Yibing Li, Xinyu Liu, Weiwei Chen and Liang Yi
Biogenic reefs and carbonate platforms are valuable natural resources, playing an important role in modulating the global climate and in carbon cycles through biological processes. Biogenic reefs in the Xisha (Paracel) Islands began in the late Oligocene...
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Andrei A. Legalov
Currently, some 564 species of Curculionoidea from nine families (Nemonychidae?4, Anthribidae?33, Ithyceridae?3, Belidae?9, Rhynchitidae?41, Attelabidae?3, Brentidae?47, Curculionidae?384, Platypodidae?2, Scolytidae?37) are known from the Paleogene. Twen...
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Gabriela Ines Schmidt,Esperanza Cerdeño,Santiago Hernández Del Pino
Pág. 368 - 382
In this contribution we present new specimens of Litopterna recovered during the last decade in Quebrada Fiera (Mendoza Province, Argentina), whose fossiliferous sediments, currently recognized as the base of Agua de la Piedra Formation, are assignable t...
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Aldo Alván De la Cruz, Astrid Criales, Hilmar von Eynatten, Istvan Dunkl, Axel Gerdes, Javier Jacay
Pág. 17 - 38
The Camaná-Mollendo Basin is an active-margin depression ~NW-SE elongated, which is located in
the forearc of southern Perú and extends from the Coastal Cordillera to the Perú-Chile Trench. This basin consists of a
grabens and half-graben complex, filled...
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Juan Manuel Álvarez Cerimedo,Darío Orts,Emilio Rojas Vera,Andrés Folguera,Germán Bottesi,Víctor A. Ramos
Pág. 504 - 520
The eastern Andean orogenic front at 36ºS shows unique attributes when compared to neighbor segments, from an anomalous eastward development of the orogenic front area due to the uplift of a zone of reduced topography in the foothills constituting a pre-...
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Jorge Munoz,Rosa Troncoso,Paul Duhart,Pedro Crignola,Lang Farmer,Charles R. Stern
Pág. 177 - 203
The mid-Tertiary Coastal Magmatic Belt in south-central Chile, which crops out both in the Central Valley and, south of 41°S, in the Coastal Cordillera as far west as the Pacific coast, formed when the locus of Andean magmatic activity expanded, both to ...
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Vanesa D. Litvak,Carlos J. Chernicoff,Stella M. Poma
Pág. 77 - 94
A solid geology map was prepared for the study region, based on the aeromagnetic survey and geological mapping of the region. The geological-structural analysis of the aeromagnetic survey has identified circular features interpreted as anular fractures a...
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Juan Pablo Pérez Panera
Pág. 117 - 140
Calcareous nannofossils from two boreholes (Campo Bola and Sur Río Chico) in the subsurface of eastern Austral Basin, Santa Cruz Province, Argentina, allowed the identification of Early to Middle Paleocene, Early to Middle Eocene and Late Eocene to Early...
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Pablo J. Torres Carbonell,Norberto Malumian,Eduardo B. Olivero
Pág. 197 - 235
The orogenic margin of the Austral-Malvinas foreland basin system is formed by a marine succession exposed at northern Península Mitre, composed of 550 m of the late Paleocene-early Eocene foredeep, and more than 2,900 m of the late middle Eocene-?Miocen...
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Norberto Malumian,Eduardo B. Olivero
Pág. 117 - 130
Deep-marine folded Oligocene and contrasting shallow marine subhorizontal Upper Miocene-Pliocene deposits, crop out at the Irigoyen River area within the Fuegian Andes folded belt. The Lower to Upper Oligocene (?Miocene) consists of folded conglomerates,...
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Norberto Malumian,Gabriel Jannou
Pág. 345 - 374
The succession of microfossil assemblages in the almost complete marine Late Cretaceous-Miocene stratigraphic column found in the Fuegian Andes, the orogenic margin of the Austral Basin, reveals a close relationship with the local tectonic events, the At...
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Carolina Muñoz-Sáez,Luisa del Carmen Pinto,Reynaldo Charrier,Thierry Nalpas
Pág. 1 - 28
The current paper analyzes the evolution of the Abanico Basin, exposed in the Chilean Principal Cordillera in central Chile (33º-35ºS). According to previous studies, the basin has been affected by two main deformational episodes; the first, related to e...
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Luis A. Spalletti,Gonzalo D. Veiga,Juan R. Franzese
Pág. 521 - 538
The siliciclastic deposits of the Rancahué Formation (Oligocene, Aluminé Basin), formed in the eastern side of the Andean Cordillera (70ºW y 39ºS) are studied to evaluate the relationship among different depositional systems in volcanic settings and to d...
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Marcelo A. Reguero,Paula V. Castro
Pág. 45 - 64
Una mandíbula incompleta de un Trachytheriinae de Edad deseadense recolectada por Carlos Ameghino en Cabeza Blanca, Provincia de Chubut, Argentina, es asignada a Anatrachytherus soria gen et sp. nov. Florentino Ameghino la ilustró, refiriéndola a Trachyt...
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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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Paulo Quezada,Francisco Hervé,Mauricio Calderón,Mark Fanning,Robert Pankhurst,Estanislao Godoy,Octavio Urbina,Rodrigo Suárez
Pág. 54 - 74
Previously undated low-grade metamorphic rocks from the Puerto Cisnes-Queulat area (44°30? S) contain detrital zircons of mid-Oligocene age (ca. 28 Ma). Their outcrops represent the easternmost occurrence of the late Oligocene to early Miocene marine vol...
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Juan R. Franzese,Leandro D?Elia,Andres Bilmes,Martin Muravchik,Mariano Hernandez
Pág. 319 - 334
The Alumine Basin is a volcano-sedimentary depocentre located in the Andean retroarc at 39°S. It is the southern part of a major depositional system: the Bio Bio-Alumine Basin. Stratigraphical, geochronological, sedimentological and structural analysis a...
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Charles R. Stern,Ricardo Floody,Domingo Espineira
Pág. 1 - 22
Mafic Mg-olivine (Fo88)+hornblende lamprophyre dikes, with Ni ~190 ppm and Cr ~390 ppm, cut late Miocene lavas in the Quebrada los Sapos a few kilometers west of the El Teniente Cu-Mo mine. These dikes have petrochemical affinities with other less primit...
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Luis F. Hinojosa
Pág. 95 - 116
A reconstruction of the continental climate of southern South America, based on physiognomic analyses of fifteen taphofloras, coming mainly from Chile and Argentina, is presented here. Based on the climate estimates and the phytogeographical composition ...
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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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