Results 151 to 160 of about 3,716 (202)
Petrographic and geochemical study of Precambrian and Paleozoic rocks in the western Anti-Atlas belt, Morocco: Facies, weathering, provenance and economic exploitation. [PDF]
HeliyonSebbab MM +10 more
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Physicochemical characterization and industrial use of Awzet Kaolin deposit in Northwestern Ethiopian plateau. [PDF]
Sci RepAli MY, Meshesha D.
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Classification of Ignimbrites and Their Eruptions
Earth-Science Reviews, 2021 Abstract The term “ignimbrite” probably encompasses the one of the largest ranges of deposit types on Earth, associated with the partial to total collapse of explosive eruption columns feeding pyroclastic density currents. Surprisingly, there is no quantified classification scheme for ignimbrite types, as there is for fallout deposits, and this is a ...
Guido Giordano, Raymond A.F. Cas
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A New Quantitative Welding Degree Classification for Ignimbrites
Environmental Earth Sciences, 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
Ali Ozvan, Ayse Orhan, Ahmet Orhan
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Environmental Earth Sciences, 2017 The paper principally focuses on the durability assessment of various stratigraphic levels of Ahlat ignimbrites collected from the eastern region of Turkey.
Ali Ozvan, Ismail Dinçer, Mutluhan Akin
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Elutriation pipes in ignimbrites: An analysis of concepts based on the Huichapan Ignimbrite, Mexico
Journal of Volcanology and Geothermal Research, 2020Abstract The upper portion of the Huichapan Ignimbrite (UHI), central Mexico, is a non-welded massive ignimbrite characterized by large and well-developed fines-poor elutriation pipes. We conclude that the most important pipe-forming process in the Huichapan Ignimbrite was deposition-triggered aggregative-type segregation, and this process is ...
Jaime G. Pacheco-Hoyos +2 more
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Ignimbrites and ignimbrite-forming eruptions
1988Ignimbrites are the most voluminous of volcanic products. Some are the largest single eruptive units known, covering thousands of square kilometres and having volumes of more than 1000 km3. Although man has never witnessed an eruption giving rise to such large volume units, they must be the most cataclysmic of all geological phenomena.
R. A. F. Cas, J. V. Wright
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Ignimbrite types and ignimbrite problems
Journal of Volcanology and Geothermal Research, 1983Abstract A spectrum of ignimbrite emplacement types exists, ranging from the “conventional” high-aspect ratio (H.A.R.I.) type, emplaced relatively quietly and passively in valleys, to the low-aspect ratio (L.A.R.I.) type, emplaced cataclysmically. Features of the L.A.R.I., such as a remarkable ability to scale mountains and cross open water and a ...
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Landscapes Developed on Ignimbrites
2017This paper analyses the landforms and landscapes developed on ignimbrites outcropping in different regions of Argentina: Portezuelo (province of Mendoza), Lihuel Calel (province of La Pampa), Pilcaniyeu (province of Rio Negro), Barda Colorada (province of Chubut) and Chon Aike (province of Santa Cruz). Some of these localities show clear resemblance to
Aguilera, Emilia Yolanda +2 more
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Sheathfolds in rheomorphic ignimbrites
Bulletin of Volcanology, 2004Structural reappraisal of several classic rheomorphic ignimbrites in Colorado, Idaho, the Canary Islands and Italy has, for the first time, revealed abundant oblique folds, curvilinear folds and sheathfolds which formed during emplacement. Like their equivalents in tectonic shear-zones, the sheathfold axes lie sub-parallel to a pervasive elongation ...
Branney, MJ, Barry, TL, Godchaux, M
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