Results 1 to 10 of about 20,254 (256)
Welded pyroclastic rock at Tongariro [PDF]
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 ...
J. H. Healy
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The Study of Derinkuyu Underground City in Cappadocia Located in Pyroclastic Rock Materials
Procedia Engineering, 2016 AbstractIts aim is to provide a case study of the historical underground city built for up to 20 thousand people. This is a very specific, building-urban concept that is tied to the extraction of tuff rock building materials. These pyroclastic material ejected volcano in contact with Anatolian and Arabian tectonic plates.
Vladimír Nývlt +3 more
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PETROGRAPHY OF PYROCLASTIC ROCK MOUNT MASURAI JAMBI PROVINCE
JOURNAL ONLINE OF PHYSICSThe magmatic arc of Sumatra Island, which is indicated by the presence of the Barisan Mountains zone on the west side of Sumatra Island with a general direction northwest - southeast, makes Mount Masurai, which is administratively in Merangin Regency, Jambi Province, become one of the volcanoes on Sumatra Island.
Febiyora Chandra Kirana +6 more
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Rock strength as a metric of welding intensity in pyroclastic deposits [PDF]
European Journal of Mineralogy, 2003 Welding of pyroclastic deposits describes the flattening of glassy pyroclasts under a compactional load at temperatures above the glass transition temperature. Traditionally, this process is mapped using metrics such as density, porosity or fabric. Here we develop rock strength as an ancillary tool for mapping variations in welding intensity.
Steven L. Quane, James K. Russell
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Multi-Rock Mass Classification Systems for the Assessment of Excavation Method and Support Design of Spillway Tunnel, Sidan Dam, Bali, Indonesia [PDF]
E3S Web of Conferences, 2023 This paper presents the implementation of rock mass classification systems to determine the excavation method and the support design of the Spillway Tunnel, Sidan Dam, Bali, Indonesia.
Arianto Benny +2 more
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The application of vertical electrical sounding in geomechanical recognition of host rock mass of anomaly III of Narigan deposit, Bafgh region, Central Iran zone [PDF]
مجله علوم و فنون هستهای, 2023 The electrical method as a geophysical survey can show the geological parameters including fragmentation, rock mass alteration index, saturation percentage and groundwater quality.
S.H. Beheshti Bafqi +3 more
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Energies, 2022 In this article, based on core description, thin section, scanning electron microscope (SEM), well logging and reservoir physical properties, the reservoir controlling factors of sedimentary pyroclastic rocks in deep-buried basins are assessed via the ...
Ranlei Zhao +5 more
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The fragmentation threshold of pyroclastic rocks [PDF]
Earth and Planetary Science Letters, 2004 In response to rapid decompression, porous magma may fragment explosively. This occurs when the melt can no longer withstand forces exerted upon it due to the overpressure in included bubbles. This occurs at a critical pressure difference between the bubbles and the surrounding magma. In this study we have investigated this pressure threshold necessary
Ben Kennedy +5 more
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Recommendations of excavation and support systems of Pamukkulu Dam diversion tunnel based on correlation of rock mass classification between RMR and GSI [PDF]
E3S Web of Conferences, 2021 This paper presents the results of geological engineering research conducted to determine the character of rock masses, recommendations of tunnel excavation method and support system based on standup time estimates in unsuported conditions.
Nasrulloh Dico +2 more
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Geofluids, 2021 Fused breccia tuff occurs globally, but its formation mechanism is very controversial. Volcanic reservoirs have developed at the bottom of the Permian Fengcheng Formation in the Wuxia region of the Junggar Basin, and here, the lithology is fused breccia ...
Duonian Xu +6 more
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