Results 201 to 210 of about 21,971 (257)

Vitruvian binders in Venice: First evidence of Phlegraean pozzolans in an underwater Roman construction in the Venice Lagoon. [PDF]

PLoS One
Dilaria S, Ricci G, Secco M, Beltrame C, Costa E, Giovanardi T, Bonetto J, Artioli G.   +7 more
europepmc   +1 more source

Open-closed conduit transitions regulate the large magnitude explosive eruptions of Petrazza, PaleoStromboli I (Stromboli, Italy). [PDF]

Sci Rep
Nicotra E, Minniti M, Ridolfi F, Sulpizio R, Tranne CA, Lucchi F.   +5 more
europepmc   +1 more source

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Factors governing the formation of pyroclastic rocks

Bulletin Volcanologique, 1970
The basic condition governing the formation of pyroclastic rocks is the relationship between the disruptive force of gas pressure in bubbles to the strength of the liquid for short term stresses and surface tension. The latter factor controls the coalescence of bubbles, because it is strongly dependent on the composition, temperature, and water content
A. R. McBirney, T. Murase
openaire   +1 more source

Stratigraphic Problems of Pyroclastic Rocks

1984
Stratigraphic methods used to study volcanic rocks are similar to those used to study sedimentary rocks and have similar purposes: establishing correlations, vertical time sequences, determining facies changes and the like. Additional aid in pyroclastic stratigraphy comes from igneous petrology, studies of magma evolution, and studies of the growth ...
Richard V. Fisher, Hans-Ulrich Schmincke
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Pyroclastic Rocks and Tectonic Environment

1984
The close proximity of continental borderlands, active and ancient tectonic regions, and modern and ancient volcanoes has long been known. Pre-plate tectonic ideas about this association culminated in Kay’s (1951) masterful synthesis showing the relationship between volcanic island arcs and ancient eugeosynclinal sedimentary basins containing abundant ...
Richard V. Fisher, Hans-Ulrich Schmincke
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Cyclic and dynamic behaviour of a soft pyroclastic rock

Géotechnique, 2015
The mechanical behaviour under cyclic and dynamic conditions of a weakly cemented pozzolana, taken from the subsoil of a historical town in a seismically active area, was investigated through laboratory tests and in situ measurements. The geotechnical characterisation at laboratory scale is of particular importance as the small- and large-scale ...
VERRUCCI, Luca, LANZO, Giuseppe, TOMMASI, PAOLO, ROTONDA, Tatiana   +3 more
openaire   +4 more sources

Potassium—argon ages of sedimentary and pyroclastic rocks

Geological Society, London, Special Publications, 1964
Summary It is rarely possible to obtain reliable potassiumargon ages from sedimentary rocks. Glauconites generally give dates that are too low and very scattered, though the largest of a group of such measurements may be useful to define minimum ages of sediments that cannot be dated in any other way.
Halfdan Baadsgaard, Martin Henry Dodson
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Welded pyroclastic rock at Tongariro

New Zealand Journal of Geology and Geophysics, 1963
Abstract Although the rocks of Tongariro National Park have been mapped and their petrograplty is reasonably well known, little attention has so far been paid to their physical character and modes of eruption. Lava, scoria, and ash are the most common types, though hot avalanches that erupted in 1949 and 1954 have been described by Battey (1949) and ...
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Upper Jurassic pyroclastic rocks in Skye, west Scotland

Nature, 1977
DURING a systematic sampling of shale lithologies in the Jurassic beds of Skye, an examination was made of sections in the Staffin Shales1–3 in Staffin Bay. Two localities were visited, one immediately south of the landslip at point 6 (ref. 4) [NG470712] and the other at point 7 (ref.
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