Results 11 to 20 of about 2,249 (210)

The ignimbrites of Terceira, Azores

, 1982
On the oceanic islands of the Atlantic ignimbrites are known to occur on Iceland, Gran Canaria, Tenerife and on two of the Azores islands, Terceira and São Miguel. Ignimbrite may form a larger proportion of the total volume of rock on the island of Terceira than it does on any of the other islands, yet the individual eruption volumes are small (≤ 1 km³)
Self, Stephen
openaire   +2 more sources

A new quantitative welding degree classification for ignimbrites

, 2023
As a pyroclastic rock type, ignimbrites may reveal varying degrees of welding depending on the temperature (> 535 ℃) and overburden pressure conditions during its formation. The welding degree of ignimbrites increases as the formation temperature and the
Tamer Topal, Mutluhan Akin, Topal, Tamer, İsmail Dinçer, Muge K. Akin, Ayşe Orhan, Dinçer, İsmail, Orhan, Ahmet, Orhan, Ayşe, Akin, Muge K., Akin, Mutluhan, Özvan, Ali, Ali Özvan, Ahmet Orhan, AKIN, MÜGE   +14 more
core   +1 more source

Magnetic Fabrics and Source Implications of Chisulryoung Ignimbrites, South Korea

Frontiers in Earth Science, 2016
The anisotropy of magnetic susceptibility (AMS) of late Cretaceous ash-flow tuffs in Chisulryoung Volcanic Formation, southeastern Korea was studied to define the primary pyroclastic flow azimuth.
Hoabin Hong, Yongjae Yu, Seong-Jae Doh, Dongwoo Suk, Jeongmin Kim   +4 more
doaj   +1 more source

Grain-size distribution of volcaniclastic rocks 1: A new technique based on functional stereology [PDF]

, 2012
The power of explosive volcanic eruptions is reflected in the grain size distribution and dispersal of their pyroclastic deposits. Grain size also forms part of lithofacies characteristics that are necessary to determine transport and depositional ...
Proussevitch, A.A., Allen, S. R., Jutzeler, M., Allen, Sharon R., Jutzeler, Martin, Prusevich, Alexander A., Allen, S.R., Proussevitch, Alex A.   +7 more
core   +1 more source

The analysis of spatial distributions, origins of caldera-forming eruptions with basaltic-andesitic magma compositions, and genesis of Miocene ignimbrites of the Eastern volcanic belt, Kamchatka

Геодинамика и тектонофизика, 2019
Based on the statistical data of the Global Volcanism Program of the Smithsonian Institution and published materials, we present a comparative analysis of caldera-forming eruptions on global scale.
O. V. Bergal-Kuvikas, A. N. Rogozin, E. S. Klyapitsky   +2 more
doaj   +1 more source

Petrographic investigation of the Precambrian basement rocks of Esh El Mallaha area, North Eastern Desert, Egypt [PDF]

Alfarama Journal of Basic & Applied Sciences, 2023
The Esh El-Mallaha mountain range is located in the northwestern segment of the Arabian-Nubian Shield. The area encompassing it is of especial significance owing to its hydrocarbon resources.
Hossam Khamis, Mohammed El-Bialy, Zakaria Hamimi, Adel Afifi, Samar Abdel Wahed   +4 more
doaj   +1 more source

Evidence for an Active, Transcrustal Magma System in the Last 60 ka and Eruptive Degassing Budget (H2O, CO2, S, F, Cl, Br): The Case of Dominica

Geochemistry, Geophysics, Geosystems, 2020
The Morne Trois Pitons‐Micotrin volcanic complex on the island of Dominica (Lesser Antilles) emitted a series of plinian eruptions between 18 and 9 ka BP.
T. d'Augustin, H. Balcone‐Boissard, G. Boudon, C. Martel, E. Deloule, P. Bürckel   +5 more
doaj   +1 more source

The origin of a zoned ignimbrite: Insights into the Campanian Ignimbrite magma chamber (Campi Flegrei, Italy) [PDF]

Earth and Planetary Science Letters, 2016
Abstract Caldera-forming eruptions, during which large volumes of magma are explosively evacuated into the atmosphere from shallow crustal reservoirs, are one of the most hazardous natural events on Earth. The Campanian Ignimbrite (CI; Campi Flegrei, Italy) represents a classical example of such events, producing a voluminous pyroclastic sequence of ...
Forni, Francesca, Bachmann, Olivier, MOLLO, SILVIO, De Astis, Gianfilippo, Gelman, Sarah E., Ellis, Ben S.   +5 more
openaire   +2 more sources

Geology of La Reforma caldera complex, Baja California, Mexico

Journal of Maps, 2019
A new geological map at 1:50,000 scale of La Reforma Caldera Complex has been produced applying modern survey methodologies to volcanic areas. This map aims to represent a reliable and objective tool to understand the geological evolution of the region ...
L. García Sánchez, J.L. Macías, R. Sulpizio, L.S. Osorio-Ocampo, C. Pellicioli, A. Pola, D.R. Avellan, G. Cisneros, F. García, Y.Z.E. Ocampo-Díaz, R.M. Lira-Beltran, R. Saucedo, J.M. Sánchez-Núñez, J.L. Arce, P. Corona-Chávez, G. Reyes-Agustin, M. Cardona, P.W. Layer, J. Benowitz, L. Solari, G. Groppelli   +20 more
doaj   +1 more source

Tephrostratigraphy and Magma Evolution Based on Combined Zircon Trace Element and U-Pb Age Data: Fingerprinting Miocene Silicic Pyroclastic Rocks in the Pannonian Basin

Frontiers in Earth Science, 2021
We present a novel approach to use zircon as a correlation tool as well as a monitor for magma reservoir processes in silicic volcanic systems. Fingerprinting eruption products based on trace element content and U-Pb dates of zircon offers a promising ...
Réka Lukács, Réka Lukács, Marcel Guillong, Olivier Bachmann, László Fodor, László Fodor, Szabolcs Harangi, Szabolcs Harangi   +7 more
doaj   +1 more source