Article
Geology
Cahit Helvaci, Yesim Yucel-Ozturk, Ioan Seghedi, Martin R. Palmer
Summary: The formation of large borate deposits requires a boron-rich source, means of transportation and concentration, and preservation mechanisms. Miocene basins in western Turkey contain world-class borate reserves, with mineralization present in stratabound deposits. Recent advances in understanding extensional tectonics and volcanism in this region provide fresh insights into the formation of these deposits, with the largest borate deposit related to a recognized caldera in the Miocene volcanic field.
INTERNATIONAL GEOLOGY REVIEW
(2021)
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
Multidisciplinary Sciences
Lin Wang, Wen-Chieh Cheng, Wenle Hu, Shaojie Wen, Sen Shang
Summary: This study analyzed the response of loess to water and sodium sulfate seepages using various testing methods. The characteristics of permeability evolution were identified and the underlying mechanisms were revealed. The macro permeability of loess decreased under water seepage test, while it increased under sodium sulfate seepage test.
Article
Geosciences, Multidisciplinary
Yin Yau Yoyo Chu, Joseph R. Michalski, Shawn P. Wright, A. Alexander G. Webb
Summary: Arabia Terra on Mars is a geologically complex region that may have a volcanic origin despite the lack of prominent shield volcanoes, with features indicating potential volcanic activity and sources for volcaniclastic sediments. The discovery of caldera complexes in Arabia Terra raises questions about their link to the region's geotectonic setting and the possibility of similar features being more widespread in the ancient Martian crust than previously recognized.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Andrea L. Llenos, Andrew J. Michael
Summary: During the 2018 Kilauea eruption and caldera collapse, frequent M similar to 5 caldera collapse earthquakes occurred, causing damage to nearby structures. This study presents a new approach to forecast the seismic hazard of these collapse earthquakes, combining probability distributions for the number of collapses and the number of earthquakes per collapse. The approach can be applied to other earthquake-triggering processes as well.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Paul Segall, Kyle Anderson
Summary: Researchers analyzed the collapse events caused by the 2018 eruption of Kilauea volcano in Hawaii to validate laboratory friction parameters at the kilometer scale. The study showed that laboratory friction laws and parameters can be used to model earthquakes, and revealed the initial conditions and material parameters leading to volcanic collapse.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Geochemistry & Geophysics
Marco Bonini, Daniele Maestrelli, Giacomo Corti, Chiara Del Ventisette, Giovanna Moratti, Gerardo Carrasco-Nunez, Guido Giordano, Federico Lucci, Gianluca Norini, Luigi Piccardi, Stefano Urbani, Domenico Montanari
Summary: Scaled analogue models were used to study the impact of different boundary conditions on intra-caldera resurgence processes, including magma intrusion depth, caldera collapse symmetry, and existing discontinuities in the pre-volcanic substratum. Experimental findings demonstrated that varying intrusion depths resulted in different resurgence styles, ranging from piston-like resurgence for deeper intrusions to intra-caldera resurgent domes for shallower intrusions. Additionally, asymmetric collapse was linked to tilted roof blocks above emptied magma reservoirs, while pre-existing faults significantly influenced the deformation patterns of piston-like resurgence.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
E. Glastonbury-Southern, T. Winder, R. S. White, B. Brandsdottir
Summary: Microearthquakes provide insight into the movement of the Baroarbunga caldera ring fault, including the 2014-2015 rifting event, gradual caldera collapse, and ongoing re-inflation. The research indicates that during the post-eruptive period, the inner side of the steeply dipping northern caldera faults has been moving upwards due to slip reversal on the same ring fault structure.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
T. Shreve, Y. Zhan, H. Le Mevel, D. Roman, Y. Moussallam
Summary: This study identifies two distinct magma reservoirs beneath Ambrym volcano in Vanuatu. The pressure changes indicate that these reservoirs may not currently be hydraulically connected, which provides further insight into the changes of magmatic plumbing systems after rift-zone eruptions.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Francy Roxana Quiroz-Valle, Lucas Martins Lino, Sergio Brandolise Citroni, Miguel angelo Stipp Basei, Mathias Hueck, Silvio Roberto Farias Vlach, Bruno Becker-Kerber, Gustavo Marcondes Evangelista Martins Prado
Summary: This study provides a detailed understanding of the tectono-magmatic cycles and volcanological evolution of the Campo Alegre-Corupa Basin. The Basin Stage and Caldera Stage were identified as two significant stages, characterized by sedimentary infilling and large-scale volcanic eruptions.
Article
Geography, Physical
Ryuhei Sanjo, Toshihiko Sugai
Summary: Understanding the relationship between post-caldera reactivation of caldera boundary faults and the cooling process of volcanoes is crucial for reconstructing the geomorphological history of calderas and assessing volcanic and seismic hazards. Research has found that the reactivation of caldera boundary faults during the cooling process is likely induced by regional stresses. Therefore, the reactivation of caldera boundary faults induced by regional stresses should be taken into consideration in reconstructions of the geomorphological evolution of calderas and associated hazard assessments.
Article
Geochemistry & Geophysics
Voon Hui Lai, Zhongwen Zhan, Quentin Brissaud, Osamu Sandanbata, Meghan S. Miller
Summary: Characterizing the large M4.7+ seismic events during the 2018 Kilauea eruption is important to understand the complex subsurface deformation at the Kilauea summit. The early events show signs of inflation while the later collapse events exhibit asymmetric slips on inward-dipping normal faults. Combining multiple geophysical data from different instruments is essential for a comprehensive analysis of the seismic source, with the summit events possibly indicating a see-saw pattern of caldera failure.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Marta Lopez-Saavedra, Joan Marti, Jose Luis Rubio, Karim Kelfoun
Summary: Extreme geohazards like volcanic eruptions, earthquakes, landslides, and tsunamis can cause cascading effects with unpredictable risks, which are often overlooked in hazard assessment. Anticipating and preparing for such extreme events is crucial for maintaining safe and sustainable lifestyles. Volcanic islands, such as Tenerife in the Canary Archipelago, have experienced multiple occurrences of cascading extreme hazards in the past, highlighting the importance of understanding and mitigating the potential consequences.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Lucas Martins Lino, Francy Roxana Quiroz-Valle, Silvio Roberto Farias Vlach, Miguel Angelo Stipp Basei, Frederico Castro Jobim Vilalva, Mathias Hueck, Jose Vinicius Martins
Summary: The Ediacaran Campo Alegre-Corup & PRIME;a Basin (CACB) is a significant geological site with rare and excellent exposure of volcanic and plutonic rocks. It experienced at least two major episodes of volcanic activity, with distinctive lithologies and compositions. This study analyzes zircon trace elements to understand the petrogenetic link between volcanic rocks and their potential source magma. The findings reveal a connection between volcanic and plutonic rocks and provide insights into the compositional changes and crystalline segregation processes within the volcanic-plutonic system. The study also highlights intense hydrothermal-induced recrystallization of zircon within the caldera structure.
Article
Geosciences, Multidisciplinary
Stephen Self, Noah Randolph-Flagg, John E. Bailey, Michael Manga
Summary: Columnar structures formed in Bandelier Tuff ignimbrites in Valles Caldera, New Mexico, show alteration and resistant properties due to the addition of zeolite minerals. The formation of these columns is attributed to the infiltration of meteoritic water into the deposit, creating localized convective chimney cells. The presence of these structures suggests a syn-glacial, pluvial climate in the region during the time of formation.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Kata Molnar, Reka Lukacs, Istvan Dunkl, Axel K. Schmitt, Balazs Kiss, Ioan Seghedi, Janos Szepesi, Szabolcs Harangi
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2019)
Article
Geochemistry & Geophysics
Ioan Seghedi, Lucian Besutiu, Viorel Mirea, Luminita Zlagnean, Razvan-Gabriel Popa, Alexandru Szakacs, Ligia Atanasiu, Mihai Pomeran, Madalina Visan
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2019)
Article
Geography, Physical
Szabolcs Harangi, Kata Molnar, Axel K. Schmitt, Istvan Dunkl, Ioan Seghedi, Agnes Novothny, Mihaly Molnar, Balazs Kiss, Theodoros Ntaflos, Paul R. D. Mason, Reka Lukacs
JOURNAL OF QUATERNARY SCIENCE
(2020)
Article
Geochemistry & Geophysics
Antoine J. J. Bracco Gartner, Ioan Seghedi, Igor K. Nikogosian, Paul R. D. Mason
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2020)
Article
Geology
Cahit Helvaci, Yesim Yucel-Ozturk, Ioan Seghedi, Martin R. Palmer
Summary: The formation of large borate deposits requires a boron-rich source, means of transportation and concentration, and preservation mechanisms. Miocene basins in western Turkey contain world-class borate reserves, with mineralization present in stratabound deposits. Recent advances in understanding extensional tectonics and volcanism in this region provide fresh insights into the formation of these deposits, with the largest borate deposit related to a recognized caldera in the Miocene volcanic field.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geochemistry & Geophysics
Barbara Faccini, Andrea Luca Rizzo, Costanza Bonadiman, Theodoros Ntaflos, Ioan Seghedi, Michel Gregoire, Giacomo Ferretti, Massimo Coltorti
Article
Geochemistry & Geophysics
R. Lukacs, L. Caricchi, A. K. Schmitt, O. Bachmann, O. Karakas, M. Guillong, K. Molnar, I Seghedi, Sz Harangi
Summary: Research on Ciomadul volcano shows that it has long-term existence of high-crystallinity magma, with zircon age analysis indicating the magma has remained in a highly crystalline mush state for millions of years. Model calculations suggest a low average rate of magma input, but a considerable crystal mush zone is still present within the magma reservoir, indicating the volcano still has the potential for eruption.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Mihai Vlasceanu, Mihai N. Ducea, Peter Luffi, Anca Barla, Ioan Seghedi
Summary: This study presents a database containing previously published geochronologic, geochemical, and isotopic data on Mesozoic to Quaternary igneous rocks from the Carpathian-Pannonian region. The database includes data from five magmatic arcs and is publicly available online. The database can be utilized to calculate paleo crustal thicknesses in the Carpathians using geochemical methods.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Review
Geology
Ioan Seghedi, Theodoros Ntaflos, Zoltan Pecskay, Cristian Panaiotu, Viorel Mirea, Hilary Downes
Summary: The Apuseni Mts. area is significant for studying the interaction between intra-continental tectonics, sedimentation, and magmatism. From approximately 14.5 to 7 million years ago, a series of tectonic events and magmatic activities occurred, resulting in diverse geological features, including graben systems and volcanic formations.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geochemistry & Geophysics
Marinel Kovacs, Alexandrina Fulop, Ioan Seghedi, Zoltan Pecskay
Summary: The Gutai Volcanic Zone in the Eastern Carpathians documents one of the most complex and long-lasting periods of Miocene volcanic activity, with two types of volcanism identified. By analyzing the volcanic plumbing systems and pressure-temperature conditions during crystallization, researchers gained insight into the evolution and distribution of volcanic activity. This study provides valuable information on the complex magmatic plumbing systems and their influence on volcanic evolution, with implications for extinct volcanism globally.
Article
Geosciences, Multidisciplinary
MaTE Szemeredi, Andrea Varga, ISTVaN Dunkl, Reka Lukacs, Ioan Seghedi, ZOLTaN Kovacs, Bela Raucsik, Elemer Pal-molnar
Summary: The Permian granitoids in the Highis massif of SW Apuseni Mts., Romania, are of anorogenic (A-type) origin and possibly related to post-collisional rifting activities, with ages around 268-263 Ma. Additionally, a plutonic-volcanic connection was revealed between the Highis granitoids and the Mid-Permian felsic volcanic rocks in the Tisza Mega-unit, showing distinct differences from the Dacia Mega-unit.
GEOLOGICA CARPATHICA
(2021)
Article
Geochemistry & Geophysics
Ioan Seghedi, Viorel M. Mirea, Gabriel C. Stefan
Summary: The Bontau Volcano in the Miocene Zarand extensional basin is the largest composite volcano in the Apuseni Mountains. It has undergone complex geological processes and has a unique structure and composition. The volcano has experienced multiple eruptive and collapse events, resulting in the formation of extensive volcanic debris deposits. The study of the volcano provides insights into the geotectonic evolution and magma evolution processes, as well as the formation of mineral deposits within the volcano.
Article
Geochemistry & Geophysics
Ioan Seghedi, Reka Lukacs, Ildiko Soos, Marcel Guillong, Olivier Bachmann, Barbara Cserep, Szabolcs Harangi
Summary: The southernmost segment of the Calimani-Gurghiu-Harghita volcanic chain in Romania consists of four aligned volcanoes and represents the youngest manifestation of post-collisional volcanism in the Carpathian-Pannonian Region. Within this section, changes in erupted magma composition and zircon ages indicate modifications in the geodynamic environment. The volcanic activity in the Cucu volcano occurred during a catastrophic slab loss period, while Pilisca and Ciomadul volcanoes developed above a remnant oceanic slab.
Article
Geography, Physical
Felix Borleanu, Laura Petrescu, Ioan Seghedi, Christine Thomas, Luca De Siena
Summary: Imaging the structure of sedimentary basins in collisional settings provides important information for resource extraction and seismic hazard analyses. Seismic attenuation, which is sensitive to stress and fluid interactions, can better constrain small changes in the Earth's matrix than seismic velocity. This study separates different types of attenuation mechanisms and maps them in space to understand the properties of the Carpathian Orogen and surrounding basins.
GLOBAL AND PLANETARY CHANGE
(2023)
Article
Geosciences, Multidisciplinary
Seghedi Ioan, Szakacs Alexandru, Mirea Viorel, Pecskay Zoltan, Luffi Peter
Summary: The Calimani-Gurghiu-Harghita volcanic range is the result of post-collisional magmatism in the Dacia Mega Unit. The volcanic activity in CGH resulted in the construction of composite volcanoes dominated by calc-alkaline lavas and volcanic debris. The study demonstrates that voluminous volcanic debris avalanche deposits vastly dominate the volcaniclastic deposits in CGH.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2023)