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Tom D. Pering and Andrew J. S. McGonigle
Basaltic activity is the most common class of volcanism on Earth, characterized by magmas of sufficiently low viscosities such that bubbles can move independently of the melt. Following exsolution, spherical bubbles can then expand and/or coalesce to gen...
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Leopoldo Lopez-Escobar,Jose Cembrano,Hugo Moreno
Pág. 219 - 234
ABSTRACT. Between latitudes 37° and 46°S of the Andes, the Nazca-South America Plate convergence is currently slightly oblique, Postglacial volcanism has been continuous and intense, being expressed as numerous composite stratovolcanoes (SV) and hundreds...
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Leopoldo Lopez-Escobar,Jose Cembrano,Hugo Moreno
Pág. 219 - 234
ABSTRACT. Between latitudes 37° and 46°S of the Andes, the Nazca-South America Plate convergence is currently slightly oblique, Postglacial volcanism has been continuous and intense, being expressed as numerous composite stratovolcanoes (SV) and hundreds...
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Leopoldo Lopez-Escobar,Mario Vergara
Pág. 227 - 244
ABSTRACT. The Southern Andes Eocene-Miocene volcanism comprises a series of paleo-volcanic belts striking N-S to N10°E. Along the longitudinal depression of central-south Chile, remnants of this volcanism are distributed between about 33° and 42.5°S. Bas...
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Leopoldo Lopez-Escobar,Mario Vergara
Pág. 227 - 244
ABSTRACT. The Southern Andes Eocene-Miocene volcanism comprises a series of paleo-volcanic belts striking N-S to N10°E. Along the longitudinal depression of central-south Chile, remnants of this volcanism are distributed between about 33° and 42.5°S. Bas...
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Gustavo W. Bertotto, Maurizio Mazzucchelli, Tommaso Giovanardi, Rommulo V. Conceiçao, Alberto Zanetti, Manuel E. Schilling, Mauro I. Bernardi, Alexis D. Ponce, Tiago Jalowitzki, Fernanda Gervasoni and Anna Cipriani
Huanul is a shield volcano with several lava flows hosting mantle xenoliths erupted during the Pleistocene (0.84 ± 0.05 Ma). It is located in the southern part of the Payenia Volcanic Province, which is among the largest Neogene-Quaternary volcanic provi...
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Kürsad Asan
This study presented whole-rock elemental and Sr-Nd isotope geochemistry data with the purpose to decipher the origin and evolution of the Miocene Elmadag Volcanic Complex, Central Anatolia (Ankara, Turkey). Volcanic products spanned in composition from ...
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Juan F. Presta,Pablo J. Caffe
Pág. 142 - 173
The monogenetic volcanism from the El Toro region (23º05?S-66º42?W) in NW Argentina comprises a group of low-volume (<5 km2) mafic volcanic rocks erupted during the Late Miocene-Pliocene in the northern Puna (Andean Central Volcanic Zone). The activit...
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Francisco Fuentes,Mario Vergara,Luis Aguirre,Gilbert Feraud
Pág. 207 - 225
Eight 40Ar/39Ar ages of rocks from two different areas of the Andes at ca. 33°S, where volcanic units separated by unconformities are exposed, are reported and discussed. These areas are Cuesta de Chacabuco at the northern prolongation of the Central Val...
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Renate M. Wall,Luis E. Lara
Pág. 243 - 258
The presence of Lower Miocene volcanic rocks in the Coastal Range of central Chile is unique in that the westernmost outcrops of the Oligocene-Miocene volcanic arc occur 80 km to the east. The Las Pataguas Lavas (LLP; 33,8°S) consists of a total exposed ...
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Ursula Kelm,María E. Cisternas,Sonia Helle,David Méndez
Pág. 241 - 252
ABSTRACT. The diagenetic character of the sedimentary rocks 01 the Tertiary basin between Los Angeles and Osorno has been assessed according to its clay mineralogy and coal rank. Illite/smectite mixed layering varies between more than 90% and more than 7...
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Ursula Kelm,María E. Cisternas,Sonia Helle,David Méndez
Pág. 241 - 252
ABSTRACT. The diagenetic character of the sedimentary rocks 01 the Tertiary basin between Los Angeles and Osorno has been assessed according to its clay mineralogy and coal rank. Illite/smectite mixed layering varies between more than 90% and more than 7...
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Jose A. Naranjo,Hugo Moreno,Carlos Emparan,Michael Murphy
Pág. 167 - 191
ABSTRACT. Recent explosive volcanism at Sollipulli volcano, southern Andes (39°S). The Solipulli volcano is a caldera that nests a ca. 2 km3 glacier. lts last eruption occurred over 700 years ago, through a parasitic cone. On the other hand, a paroxismal...
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Steven F. Olson
Pág. 3 - 29
ABSTRACT. The Potrerillos district displays major facies boundaries, records changes in the compositions of magmas from Jurassic to Oligocene time, and provides evidence that a porphyry copper deposit and associated skarn (37 Ma) formed between Jurassic-...
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Luciano Onnis, Roberto Antonio Violante, Ana Osella, Matías de la Vega, Alejandro Tassone, Ernesto López
Pág. 35 - 46
A new shallow multichannel seismic survey was carried out in the Llancanelo Lake region (Southern
Mendoza Province, Argentina), in order to complete and extend previously surveyed seismic sections. The new seismic
data allowed to double the already exist...
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Clara Eugenia Cisterna, Magdalena Koukharsky, Beatriz Coira, Christina Günter, Horstpeter H. Ulbrich
Pág. 123 - 146
This study is focused on the analysis of volcanic deposits that crop out at the middle portion of the Las
Planchadas range, northern part of the Famatina System in Argentina. These volcanic rocks are records of an Ordovician
effusive basaltic volcanism t...
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