|
|
|
|
|
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...
ver más
|
|
|
|
|
|
|
|
|
|
|
Giovanni Zanchetta,Adriano Ribolini,Matteo Ferrari,Monica Bini,Ilaria Isola,Marco Lezzerini,Carlo Baroni,Maria Cristina Salvatore,Marta Pappalardo,Enrique Fucks,Gabriella Boretto
Pág. 130 - 144
Ground wedge structures of cryogenic origin are common in the Quaternary sediments along the coast of the Patagonia, and their formation is related to climatic cold events experienced by this area in the Late Quaternary. The infilling sediments of two we...
ver más
|
|
|
|
|
|
|
|
|
|
|
Derek J. Weller, María Eugenia de Porras, Antonio Maldonado, César Méndez, Charles R. Stern
Pág. 229 - 248
Sediment cores from lakes and bogs in the Río Cisnes valley contain tephra from explosive eruptions of
volcanoes in the southern part of the Andean Southern Volcanic Zone (SSVZ). These tephra, which thicken and coarsen
to the west, are attributed to erup...
ver más
|
|
|
|
|
|
|
|
|
|
|
Charles Stern, Patricio I. Moreno, William I. Henríquez, Rodrigo Villa-Martínez, Esteban Sagredo, Juan C. Aravena, Ricardo de Pol-Holz
Pág. 1 - 19
Two Holocene tephras encountered in outcrops, cores and trenches in bogs, and lake cores in the area
around Cochrane, southern Chile, are identified (based on their age, tephra glass color and morphology, mineralogy,
and both bulk and glass chemistry) as...
ver más
|
|
|
|
|
|
|
|
|
|
|
Charles Stern,María Eugenia de Porras,Antonio Maldonado
Pág. 173 - 189
Based on their petrography and chemistry, 18 tephra analyzed from two lake and bog cores and one outcrop in the upper Río Cisnes valley are believed to have been derived from nine different eruptions of the Mentolat volcano, four of the Melimoyu volcano,...
ver más
|
|
|
|
|
|
|
|
|
|
|
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...
ver más
|
|
|
|
|
|
|
|
|
|
|
Jose A. Naranjo,Charles R. Stern
Pág. 225 - 240
Tephra deposits exposed in road-cuts in both Chile and Argentina between approximately 42°30' to 45°S preserve evidence of four small (VEI <3 and volume <0.15 km3) and seven medium size (VEI = 3-5 and volume between 0.15 to 1 km3), or possibly larg...
ver más
|
|
|
|
|
|
|
|
|
|
|
Rolf Kilian,Miriam Hohner,Harald Biester,Hans J. Wallrabe-Adams,Charles R. Stern
Pág. 32 - 37
Peat and lake sediment cores from Peninsula Muñoz Gamero in the southernmost Main Andean Cordillera, and also Seno Skyring fjord and Peninsula Brunswick in the Andean foothills, have been investigated to refine the local Holocene tephrochronology. New 14...
ver más
|
|
|
|
|
|
|
|
|
|
|
Charles R. Stern
Pág. 139 - 146
The Hudson volcano (46°8) is identified, on the basis of chemical data, as the source of a characteristically green-brown tephra within Holocene deposits on Tierra del Fuego. The 10-15 cm thicknesses of these ash layers, found over 900 km from their sour...
ver más
|
|
|
|
|
|