Article
Geosciences, Multidisciplinary
Guido Giordano, Ray A. F. Cas
Summary: Ignimbrites represent a wide range of deposit types associated with volcanic eruptions, lacking a quantified classification scheme and hindering the standardization of descriptors for ignimbrites. By studying correlations between runout, areal extent, aspect ratio, and volume, it is possible to propose a classification scheme for ignimbrites based on field observables. The relationships identified suggest a power-law relationship between dispersal area/equivalent runout and bulk volume, providing insights into the dynamics of pyroclastic flows.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
I. R. Hernando, I. A. Petrinovic, S. R. Guzman, L. Calvo, J. Bucher, C. Balbis
Summary: This study provides a detailed description of the characteristics and formation mechanism of the Las Mellizas Ignimbrite through field work and experimental analysis. The results indicate that the Las Mellizas Ignimbrite was deposited from high-temperature and concentrated pyroclastic density currents, with its formation mainly influenced by magmatic processes and aided by tectonic activity.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
S. L. de Silva, J. Roberge, L. Bardelli, W. Baez, A. Ortiz, J. G. Viramonte, J. M. Arnosio, R. Becchio
Summary: The study focused on investigating the magmatic evolution and pre-eruptive architecture of the siliceous magma complex beneath the Cerro Blanco volcanic complex in the Central Andes of Argentina. It revealed that andesitic recharge and mixing with rhyolitic magma occurred at the base of the magma complex at around 10 km depth, and that the rhyolite suite in the Cerro Blanco volcanic complex is part of a regional southern Puna, arc-related ignimbrite group.
Article
Geography, Physical
Sergei Lazarev, Lutz Christian Maul, Klaudia Kuiper, Damien Becker, Maia Bukhsianidze, Hayk Hovakimyan, Lilit Sahakyan, Davit Vasilyan
Summary: The South Caucasus region, with its volcanic and volcaniclastic deposits, has provided valuable insights into the late Cenozoic dispersal pathways of terrestrial vertebrates between Europe, Asia, and Africa. The rich fossil vertebrate faunas found in this region suggest that it played a significant role in facilitating the exchange of vertebrates between these continents during the late Cenozoic.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Multidisciplinary Sciences
Eric L. Newland, Nicola Mingotti, Andrew W. Woods
Summary: This passage describes the deposits from explosive submarine eruptions found in the deep sea and the model of a turbulent fountain. Laboratory experiments show that sedimentation at the top of the fountain enables some of the hot water to continue rising as a buoyant plume and form fall deposits. The study of the controls on the concurrent fall and flow deposits is important for understanding submarine eruptions.
SCIENTIFIC REPORTS
(2022)
Article
Geosciences, Multidisciplinary
M. C. Lamberti, A. Chiodi, M. Agusto, R. Filipovich, A. Massenzio, W. Baez, F. Tassi, O. Vaselli
Summary: The study conducted the first carbon dioxide diffuse degassing survey in the Cerro Blanco Geothermal System, revealing significant soil diffuse emissions only within the Cerro Blanco caldera. The thermal energy release associated with the diffuse degassing process was estimated to be low, likely due to an efficient cap-rock at depth.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Laurie Brown, Brad S. Singer, Miriam Barquero-Molina
Summary: This study presents new 40Ar/39Ar ages and paleomagnetic data from a variety of ignimbrites and lava flows in the Central Volcanic Zone of the Andes, east of the Atacama Desert in Chile. The ignimbrites range in age from 4.2 Ma to 0.5 Ma, while the lava flows have ages ranging from 3.5 Ma to 0.1 Ma, with significant differences in paleomagnetic directions between the two rock types. The research also shows that the paleosecular variation in magnetic field direction at the study sites is larger than current models predicted.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
M. L. Velez, E. Bustos, L. Euillades, M. Blanco, J. F. S. Lopez, I. Barbero, M. Berrocoso, A. Gil Martinez, J. G. Viramonte
Summary: The study on Cerro Blanco Volcanic Complex reveals a slowdown in subsidence velocity since 1992, decreasing from 2.6 cm/yr to 0.87 cm/yr. By processing DInSAR data and using GPS as a complementary tool, a circular deformation pattern of about 12 km diameter related to subsidence centered at CBVC throughout the entire period was found. Analytical inverse modelling was used to infer the main characteristic of the source responsible for the measured displacement, with the best-fitting solution corresponding to a spherical source located between 9 and 14 km from the surface with a volume decrease of about 0.013 km(3)/yr for the entire period.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
B. van Alderwerelt, I. A. Ukstins, F. C. Ramos
Summary: The Cerro Overo maar in the Central Andes is the most mafic lava found within the modern subduction arc, preserving signals from deep-crustal or upper mantle magmatism. Researchers have debated whether the enriched isotope ratios in this region are from the mantle source or crustal processes. The Olivine-hosted melt inclusions provide evidence that the radiogenic isotopic characteristic of the region results from lithospheric processes rather than inheritance.
Article
Environmental Sciences
Gen Ito, Jessica Flahaut, Osvaldo Gonzalez-Maurel, Benigno Godoy, Vincent Payet, Marie Barthez
Summary: The APVC in the Central Andes is an arid region with extensive volcanism and unique geological features. The complexity of the region presents opportunities for further analog studies that have not been exploited previously.
Article
Geosciences, Multidisciplinary
Loreto Hernandez Prat, Claudia Cannatelli, Benigno Godoy, Daniel Astudillo Manosalva, Diego Morata, Jamie T. Buscher
Summary: La Torta is an important rhyolitic lava dome located in northern Chile. It stands out from other volcanic systems in the area due to its unique petrological and geochemical characteristics. The dome was formed from a rhyolitic magma with high contents of calcium and potassium, and its parental source was a highly hydrous mush of andesitic composition. The process of heating and ascent of the magma caused partial melting of amphibole and pyroxene, leading to the formation of enriched melt inclusions. New amphibole crystallized and trapped the enriched melt, while plagioclase and quartz inherited from the parental mush also became part of the magma that eventually erupted as La Torta.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Jorge E. Romero, Gabriel Ureta, Paulina Fuentes, Alexandre Corgne, Jose A. Naranjo, Carlos F. Ramirez, Boris Chako-Tchamabe, Miguel Caceres, Jose Lazcano
Summary: This study reconstructs the geology and eruptive history of Cerro Negro volcano, a large-volume polycyclic monogenetic volcano. The eruption process includes phreatomagmatic activity, lava fountaining, and Strombolian styles of volcanic activity, with changes in material composition.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Sally Davies, Dorrik Stow, Uisdean Nicholson
Summary: This study analyzed the sedimentary facies of the Eirik Drift, revealing significant differences between the Holocene sequence and the deglacial interval, showcasing variations in the roles of EGC and DWBC. The palaeocurrent data showed two separate current directions within 500 years. Late glacial sediments showed a higher degree of current influence.
Article
Geosciences, Multidisciplinary
Pascal Sieck, Pablo Davila-Harris, Ruben Alfonso Lopez-Doncel, Joselin Almaguer, Alfredo Aguillon-Robles, Klaus Wemmer, Randall Guevara
Summary: The southern portion of the Mesa Central in Mexico is characterized by volcanic activity from the Oligocene to Miocene periods, with rhyolitic and andesitic magmas erupting due to subduction-related and extensional settings. Geochemical and geophysical analyses suggest that the ascent and eruption of magma in this region were influenced by Basin and Range extensional processes.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Javier Escuder-Viruete, Eduardo A. Molina, Dario Chinchilla, Janet Gabites, Raul Seggiaro, Cintia A. Marquetti, Nemesio Heredia
Summary: In this study, the genetic relationships between regional deformation, volcanic activity, and epithermal mineralization were investigated in the Quevar Volcanic Complex of the Andes. The results show that volcanic activity and hydrothermal processes were controlled by different tectonic regimes during different stages, highlighting their significant influence on the formation of volcanic belts and mineralization.
JOURNAL OF STRUCTURAL GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Dale H. Burns, Shanaka L. de Silva, Phil Shane, Matthew A. Coble
Summary: Our understanding of magmatism in the New Zealand North Island subduction system is limited by our knowledge of the deep arc crust, particularly in the northern Taupo Volcanic Zone (NTVZ). This study uses detailed analysis of crystalline phases and melt inclusions to investigate the magmatic processes occurring in the lower crust beneath Putauaki in the NTVZ. The findings suggest a multi-stage evolution in the lower crust, with deep assimilation of isotopically enriched lower crust and subsequent ascension of evolved melts into the lower crust.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2022)
Article
Geosciences, Multidisciplinary
S. L. de Silva, J. Roberge, L. Bardelli, W. Baez, A. Ortiz, J. G. Viramonte, J. M. Arnosio, R. Becchio
Summary: The study focused on investigating the magmatic evolution and pre-eruptive architecture of the siliceous magma complex beneath the Cerro Blanco volcanic complex in the Central Andes of Argentina. It revealed that andesitic recharge and mixing with rhyolitic magma occurred at the base of the magma complex at around 10 km depth, and that the rhyolite suite in the Cerro Blanco volcanic complex is part of a regional southern Puna, arc-related ignimbrite group.
Article
Geochemistry & Geophysics
Laura Calabro, Tomaso Esposti Ongaro, Guido Giordano, Mattia de' Michieli Vitturi
Summary: In this study, a two-dimensional depth-averaged model was used to simulate the flow dynamics of caldera-forming pyroclastic currents. The effects of initial parameters on the deposit characteristics were examined, and the source parameters of the Pozzolane Rosse ignimbrite were reconstructed based on the ignimbrite depositional characteristics. The results show that the depth-averaged model is suitable for simulating inertial pyroclastic currents and can be used to assess hazards for future eruptions.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Alejandro Cisneros de Leon, Tushar Mittal, Shanaka L. de Silva, Stephen Self, Axel K. Schmitt, Steffen Kutterolf
Summary: The Youngest Toba Tuff (YTT) supereruption and the Los Chocoyos (LCY) supereruption have identical ages, raising the question of whether these synchronous eruptions are a coincidence or have a cause-and-effect relationship. By analyzing the eruptive record from the past 2 million years, researchers find that the probability of having two near antipodal supereruptions within a short period of time is very low, suggesting that there may be a non-random mechanism behind these synchronous eruptions.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Shanaka De Silva, Stephen Self
Summary: Despite the historical hyperbole and misuse, the term "supervolcano" remains useful when defined and used correctly in the field of volcanology. This article focuses on the etymology of supervolcano and its dependence on the term "supereruption". It proposes that supervolcano should be limited to a volcano that has experienced at least one silicic explosive eruption of Magnitude 8 or greater. There are currently nine active supervolcanoes on Earth, distinguished by clear magmatic, volcanological, and structural extremes. Most eruptions from supervolcanoes are small effusive eruptions, and the term should not be used for basaltic volcanoes.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Reka Lukacs, Szabolcs Harangi, Peter Gal, Janos Szepesi, Andrea Di Capua, Gianluca Norini, Roberto Sulpizio, Gianluca Groppelli, Laszlo Fodor
Summary: This paper outlines the lithostratigraphic characteristics and classification of silicic pyroclastic deposits in Northern Hungary during the early- to mid-Miocene. Based on new geochronological, volcanological, petrological, and geochemical data, the lithostratigraphic units have been revised and renamed. This revision is important for geological mapping and other related studies.
GEOLOGICA CARPATHICA
(2022)
Article
Geosciences, Multidisciplinary
Daniel Bertin, Jan M. Lindsay, Shane J. Cronin, Shanaka L. de Silva, Charles B. Connor, Pablo J. Caffe, Pablo Grosse, Walter Baez, Emilce Bustos, Robert Constantinescu
Summary: Evaluation of volcanic hazards typically focuses on single eruptive centers or localized areas, and expanding the assessment to wide regions is rarely attempted. This study introduces new approaches to quantify the hazards in the Central Volcanic Zone of the Andes and produces a set of volcanic hazard maps. The results identify five regions of high spatial probability, three of which correlate with geophysical evidence.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
P. H. Barry, J. M. De Moor, A. Chiodi, F. Aguilera, M. R. Hudak, D. V. Bekaert, S. J. Turner, J. Curtice, A. M. Seltzer, G. L. Jessen, E. Osses, J. M. Blamey, M. J. Amenabar, M. Selci, M. Cascone, A. Bastianoni, M. Nakagawa, R. Filipovich, E. Bustos, M. O. Schrenk, J. Buongiorno, C. J. Ramirez, T. J. Rogers, K. G. Lloyd, D. Giovannelli
Summary: This study reports helium isotope and abundance data for fluid and gas samples from the Andean Convergent Margin, showing that crustal thickness plays a significant role in determining volatile composition.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geology
L. Bardelli, F. Lucci, M. Arnosio, E. Bustos, R. Becchio, R. Filipovich, A. Villagran, J. Viramonte
Summary: Arc magmatism plays a crucial role in the growth and differentiation of continental crust. This study focuses on the long-lived Cordillera de San Buenaventura volcanic system in NW Argentina to understand the evolution of transcrustal magmatic plumbing systems and the construction of a stratified continental crust. The study reveals a cyclic scenario with mantle melts undergoing fractional crystallization and mafic magma recharge events during the formation of the deep crustal 'hot zones'. The study also considers the geodynamic framework dominated by subduction and arc magmatism migration.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
F. Di Fiore, A. Vona, A. Scarani, G. Giordano, C. Romano, D. Giordano, L. Caricchi, A. Martin Lorenzo, F. Rodriguez, B. Coldwell, P. Hernandez, M. Pankhurst
Summary: The 2021 Tajogaite eruption of Cumbre Vieja (La Palma, Spain) involved the emission of low viscosity lavas with high flowability. Experimental investigations revealed that the rheological evolution of the melt is controlled by disequilibrium crystallization and its timescale. These findings help us understand the exceptional flowing ability of the lavas.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geography
Christopher Abis, Francesca Dajma, Andrea Di Capua, Joan Marti Molist, Stavros Meletlidis, Gianluca Norini, Claudia Principe, Gianluca Groppelli
Summary: The geological survey in El Hierro aimed to produce a new Geological Map at 1:12,500 scale for the Southern Rift. The study mapped almost 70 km(2) and provided a detailed understanding of the stratigraphy and volcano-tectonic reconstruction of the area. The map, which includes lava flows fields, volcanic edifices, and volcano-tectonic structures, is crucial for studying the geological evolution and assessing volcanic hazards of the Island.
Article
Astronomy & Astrophysics
James R. Zimbelman, Mauro G. Spagnuolo, Shanaka L. de Silva
Summary: Plains covered by gravel-dominated desert pavement in the Puna of Argentina have a aerodynamic roughness height (or length) of about 1 cm, representing a skimming flow regime. In the megaripples larger than 60 cm tall, the aerodynamic roughness height is elevated to values of 2-4 cm. These findings help improve our understanding of the aerodynamics of desert pavements and megaripples on Mars, as observed by multiple rovers.
PLANETARY SCIENCE JOURNAL
(2023)
Article
Geochemistry & Geophysics
Jacopo Natale, Stefano Vitale, Guido Giordano, Lorenzo Fedele, Federico Lucci, Alessandro Vona, Ernesto Paolo Prinzi, Francesco D'Assisi Tramparulo, Roberto Isaia, Sabatino Ciarcia
Summary: This paper presents a multidisciplinary study of the Roccamonfina volcano and its surrounding area in the southern Apennines, Italy. The study reveals the volcanic history and characteristics of a specific eruption event, as well as its timing and impact on the region. The results indicate that the eruption occurred during a Middle Pleistocene extensional event, which had significant regional implications including uplift and exhumation.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Energy & Fuels
Erika Barison, Flavio Poletto, Gualtiero Boehm, Biancamaria Farina, Gerardo Carrasco-Nunez, Gianluca Norini, Guido Giordano, Giorgia Pinna
Summary: The Los Humeros volcanic complex in Mexico is being investigated as a potential site for a super-hot geothermal system due to its high temperature. The GEMex project aimed to characterize the geological and geophysical aspects of the area to assess its feasibility. By analyzing seismic data and combining it with borehole information, the study provides insights into the subsurface structure and fault systems of the caldera, offering valuable information for understanding volcanic collapses and geothermal fields.
Article
Geosciences, Multidisciplinary
Emilce Bustos, Marcelo Arnosio, Hugo Murcia, Eliana Arango Palacio, Martha Gabriela Gomez-Vasconcelos
Summary: Geomorphological mapping is essential for identifying landforms, erosion, and understanding the morphological evolution over time. Through the analysis of volcanic activity, fieldwork, and geochronological data, it was found that Cerro Bravo volcano's activity migrated northwards over time, with effusive and explosive eruptions occurring in successive stages. This study helps assess geological risk and potential hazards in inaccessible areas.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
