Results 151 to 160 of about 5,185 (202)
High-resolution tephrochronology resolves stratigraphic complexities in archaeologically significant Nariokotome tuffs, Turkana Basin. [PDF]
Proc Natl Acad Sci U S ASamim S, Dalton H, Phillips D, Hergt J.
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Journal of Volcanology and Geothermal Research, 2013 Abstract Rheomorphic structures in welded ignimbrites are commonly associated with deposition from hot pyroclastic flows on inclined topography or by tractional shear on aggrading agglutinate by the pyroclastic density current. We describe a type of rheomorphic deformation involving the formation of diapirs in ignimbrite following the re ...
Maurizio Mulas, Raffaello Cioni
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Classification of Ignimbrites and Their Eruptions
Earth-Science Reviews, 2021Abstract 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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Journal of Volcanology and Geothermal Research, 2014 Distribution of ignimbrites is controlled chiefly by preexisting topography forming thin veneer deposits on steepslope relief and thicker, valley-ponding deposits in valley bottoms.
Claudio Scarpati, Annamaria Perrotta
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Ignimbrite Flare-Ups and Their Drivers: A New Zealand Perspective
Earth-Science Reviews, 2016 Ignimbrite flare-ups are periods of intense silicic volcanism characterized by multiple caldera-forming eruptions that together evacuate 103 to 104 km3 of magma.
J V Rowland, G S Leonard, C D Deering
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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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