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Application of X-Ray Microtomography in Pyroclastic Rocks
2019Earth scientists gather geological information from rocks in order to understand the geological processes better. It is compulsory to examine rocks in detail for reliable geological deductions. Petrographical analyses, which inspect the rocks in terms of their physicochemical composition and texture, represent the primary step for accurate geological ...
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Archaeomagnetic results from mural paintings and pyroclastic rocks in Pompeii and Herculaneum
Physics of the Earth and Planetary Interiors, 2000Abstract This work investigates the magnetic remanence associated with red pigments from murals at Pompeii and compares their directions to those of the pyroclastic rocks from the Vesuvius AD 79 eruption. The remanence of the murals is shown, using X-ray analyses, to be carried by haematite.
ZANELLA, Elena +6 more
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An experimental investigation of the mechanical behaviour of a pyroclastic soft rock
1998This paper presents the results of an experimental investigation of the mechanical behaviour of a pyroclastic soft rock, locally known as Pozzolana Nera, from the volcanic complex of the Colli Albani (Roma). The laboratory testing programme consisted of standard drained and undrained triaxial compression tests, at increasing values of cell pressure ...
CECCONI, Manuela +2 more
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Science, 1985 Geotechnical characteristics of ignimbrite: A soft pyroclastic rock type
Engineering Geology, 1993Abstract The ranges of a variety of geotechnical properties encompassed by the ignimbrite lithology are established. Ignimbrites are of low density (1212–1928 kg m −3 ) and high porosity (18–51%), are very weak to weak in compression (0.23–54 MN m −2 ), have low tensile strength (0.12–7.1 MN m −2 ) and cohesion (0.06–9.0 MN m −2 ), yet the angle ...
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MICROSTRUCTURE AND POZZOLANIC ACTIVITY OF SOME PYROCLASTIC ROCKS FROM SARDINIA (ITALY)
1991Pozzolanic cements have been used for millennia as building materials, but they can also satisfy modern requirements, namely low energy consumption in production and durability. This article describes work which studied, by chemical, physical, petrographical and technological means, the pozzolanic characteristics of four Oligocene-Miocene calcalkaline ...
SISTU, GIOVANNI +3 more
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Physical and structural properties of a pyroclastic soft rock
1998The subsoil of a large area surrounding the city of Rome (Italy) consists mainly of pyroclastic deposits originated from the explosive activity of the Colli Albani volcanic complex. This paper focuses on a type of pyroclastic soft rock, locally known as Pozzolana Nera. The structural features of the deposit are presented in the paper.
CECCONI, Manuela, Viggiani G.
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Modal analysis of pyroclastic rocks by combined Rietveld and RIR methods
Powder Diffraction, 1996The modal analysis of samples belonging to the zeolite-rich pyroclastic formation named “Neapolitan yellow tuff” (Central and Southern Italy) has been determined by full-profile refinement of X-ray powder diffraction (XRPD) data using a combined Rietveld–RIR method. The quantitative analysis and especially the zeolite content is a profitable source for
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Pyroclastic Rocks of India in Space & Time
Journal of the Geological Society of India, 2021openaire +2 more sources