Results 81 to 90 of about 2,249 (210)

Source of the Glencoe Ignimbrites [PDF]

open access: yesNature, 1963
IGNIMBRITES1,2 are a characteristic component of the typically post-orogenic basalt–andesite–rhyolite volcanic association. These pyroclastic deposits are now generally accepted2 as having been produced by eruptions of nuees ardentes in which solid particles, both rock and crystal fragments, glass shards and pumice fragments are suspended by turbulent ...
openaire   +1 more source

Transport and emplacement of ignimbrites and resedimented volcaniclastics from Gutai Mts., Eastern Carpathians, Romania

open access: yes, 2012
Gutâi Mts. had started to be built up in Middle Miocene, ca. 15.4 Ma ago. A series of explosive events developed starting with a major magmatic explosion and caldera collapse responsible for large volumes of ignimbrites.
Fülöp, Alexandrina
core   +1 more source

Magma Chamber Model of Batur Caldera, Bali, Indonesia: Compositional Variation of Two Facies, Large-Volume Dacitic Ignimbrites

open access: yesIndonesian Journal on Geoscience, 2015
DOI:10.17014/ijog.2.2.111-124Batur is one of the finest known calderas on Earth, and is the source of at least two major ignimbrite eruptions with a combined volume of some 84 km3 and 19 km3.
Igan S. Sutawidjaja   +2 more
doaj   +1 more source

Alteration processes of the Roque Nublo ignimbrites (Gran Canaria, Canary Islands)

open access: yes, 1995
The non-welded, lithic-rich ignimbrites of Roque Nublo are the most characteristic deposits of the second magmatic cycle (Pliocene in age) on Gran Canaria.
Mangas, J.   +3 more
core   +1 more source

Ignimbrites of the Cerro Galan caldera, NW Argentina

open access: yes, 1985
The 35 × 20 km Cerro Galán resurgent caldera is the largest post-Miocene caldera so far identified in the Andes. The Cerro Galán complex developed on a late pre-Cambrian to late Palaeozoic basement of gneisses, amphibolites, mica schists and deformed ...
O'Callaghan, L.O.   +6 more
core   +1 more source

Neogene ignimbrites and volcanic edifices in southern Peru: Stratigraphy and time-volume-composition relationships [PDF]

open access: yes, 2008
In the Central Andes of Peru, four volcanic arcs, termed Tacaza, Lower and Upper Barroso, and Frontal arc, have been active over the past 30 Ma (Fig. 1). They form five units between Moquegua and Nazca (14°30– 17°15’°S and 70–74°W).
Wörner, Gerhard   +9 more
core  

Petrogenesis of Central American Tertiary ignimbrites and associated Caribbean Sea tephra

open access: yes, 2007
Ignimbrites, as widespread sheets tens of meters thick, form the Central American Tertiary Ignimbrite Province. Geochemical data were collected from 99 Cenozoic marine ash layers within Caribbean Sea sediments, 76 vitrophyres, and 21 mafic lavas from ...
H. Sigurdsson   +13 more
core   +1 more source

Porosity and Pore-Network Controls on Elastic Properties and Permeability in Porous Ignimbrites

open access: yesApplied Sciences
In porous ignimbrites, porosity defines the first-order control on elastic trend, but rocks with similar porosity can still behave differently because their pore networks are arranged differently.
Hugo Sereno, Antonio Pola
doaj   +1 more source

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