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Sergio Leyva, Noelia Cruz-Pérez, Jesica Rodríguez-Martín and Juan C. Santamarta
Due to their genesis, volcanic rocks present some singularities that make their geotechnical characteristics significantly different from other more common types of massifs, such as sedimentary and metamorphic rocks. The formation mechanisms of volcanic ...
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Muhammad Nawaz, Waqas Ahmed, Muhammad Yasir, Ihtisham Islam, Hammad Tariq Janjuhah, George Kontakiotis, Assimina Antonarakou and Christina Stouraiti
The utilization of dimension stone in construction has been prevalent since ancient times; however, its application in modern construction has gained significant attention over the last few decades. This research aimed to assess the physical and strength...
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Wenxi Chen, Xifang Liu, Yuanyi Zhao and Yongjie Lin
The Qinghai?Tibet Plateau (QTP) hosts significant lacustrine sedimentary boron-rich deposits, with the Xiongba Basin being a prominent region housing two large sedimentary boron-rich deposits. These deposits are closely associated with extensive Neogene ...
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Pierre Belle, Bertrand Aunay, Patrick Lachassagne, Bernard Ladouche and Jean-Lambert Join
Among the processes controlling landslide dynamics, piezometry plays a major role. The characterization of a landslide?s aquifer recharge (=inflows) is thus indispensable for predicting displacements. In this research, the recharge of the large Grand Ile...
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Maria E. Vattuone,Carlos O. Latorre,Pablo R. Leal
Pág. 161 - 176
Ca-dachiardite is present in Cretaceous volcanic breccias affected by very low grade metamorphism. The cement of the breccia shows quartz, Ca-dachiardite, mordenite, cristobalite, calcite and siderite, while in the clasts there are pectolite, prehnite, y...
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Myrl E. Beck, Jr,Russell F. Burmester,Brian C. Steele
Pág. 153 - 163
Paleomagnetic data were obtained for 12 sites in gently dipping, fresh to slightly altered volcanic and volcaniclastic rocks near Lago Verde, Aisén Province, Southern Chile. Similar directions found in high and low stability magnetite and pyrrhotite, plu...
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Myrl E. Beck, Jr,Russell F. Burmester,Brian C. Steele
Pág. 153 - 163
Paleomagnetic data were obtained for 12 sites in gently dipping, fresh to slightly altered volcanic and volcaniclastic rocks near Lago Verde, Aisén Province, Southern Chile. Similar directions found in high and low stability magnetite and pyrrhotite, plu...
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Veronica Oliveros,Diego Morata,Luis Aguirre,Gilbert Feraud,Michel Fornari
Pág. 209 - 232
Jurassic to Early Cretaceous magmatism in the Coastal Cordillera of northern Chile is represented by thick sequences of mostly basaltic-andesitic to andesitic lava flows and minor sedimentary rocks. The volcanic sucession was intruded by large plutonio b...
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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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Jonathan E. Tobal,Emilio Rojas Vera,Andrés Folguera,Victor A. Ramos
Pág. 442 - 463
This geological study, carried out in the Cordón del Hielo Azul, west of the town of El Bolsón (Río Negro province, Argentine), shows the different relationships between the Early Jurassic cordilleran volcano-sedimentary sequence, the Middle-Late Jurassi...
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Mario Vergara,Diego Morata,Rosemary Hickey-Vargas,Leopoldo Lopez-Escobar,Ingrid Beccar
Pág. 23 - 41
Upper Eocene to Middle Miocene volcanic rocks are found in the Colbún area, Linares Precordillera, central Chile (35º35'-36ºS). Based on stratigraphic characteristics, K-Ar and Ar-Ar dating, two different units are recognized: 1-a Lower Unit (Upper Eocen...
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Mario Vergara,Diego Morata,Rosemary Hickey-Vargas,Leopoldo Lopez-Escobar,Ingrid Beccar
Pág. 23 - 41
Upper Eocene to Middle Miocene volcanic rocks are found in the Colbún area, Linares Precordillera, central Chile (35º35'-36ºS). Based on stratigraphic characteristics, K-Ar and Ar-Ar dating, two different units are recognized: 1-a Lower Unit (Upper Eocen...
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Mauricio Mella,Jorge Munoz,Mario Vergara,Erik Klohn,Lang Farmer,Charles R. Stern
Pág. 131 - 154
The Tronador Volcanic Group (TVG) is located in the transition between the central and southern segment of the Andean Southern Volcanic Zone (SVZ), »50 km to the east of the current volcanic front. The TVG includes, from older to younger, the deeply erod...
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Ir Hakim Duppa M.T
Pág. 2910 - 2915
Waterlogging occurs when rain is rain water that gathered accumulation exceeded the rainag capacity of the river and it is causedndue to the absence of absorption infiltration into the soil this the study aimed to assess the basic characteristics of the ...
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Stefan Richter,Jens Götze,Hans Niemeyer,Robert Möckel
Pág. 386 - 396
In the present study a first found of agates in Chile is reported from the Cordón de Lila region in northern Chile. The agates occur as veins and lenses in altered Permian volcanic rocks. The rock composition is rhyodacitic/ dacitic consisting of a fine-...
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Gary S. Michelfelder, Todd C. Feeley, Alicia D. Wilder and Erik W. Klemetti
To better understand the origin of across-strike K2O enrichments in silicic volcanic rocks from the Andean Central Volcanic Zone, we compare geochemical data for Quaternary volcanic rocks erupted from three well-characterized composite volcanoes situated...
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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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Esteban Salazar,Paulina Vásquez,Daniela Vallejos,Christian Creixell,Verónica Oliveros,Mihai N. Ducea
Pág. 207 - 255
Triassic rock units of northern Chile (28-29° S) record the transition, both in time and space, between two major orogenies that affected the southwestern margin of South America, the Gondwanian and Andean orogenies. The geodynamic configuration of the m...
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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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