Results 71 to 80 of about 5,185 (202)

Ages on weathered Plio-Pleistocene tephra sequences, western North Island, New Zealand [PDF]

, 2001
Using the zircon fission-track method, we have obtained five ages on members of two strongly-weathered silicic, Pliocene-Pleistocene tephra sequences, the Kauroa and Hamilton Ash formations, in western North Island, New Zealand.
Liddell, Ivan J., Lowe, David J., Tippett, J. Mark, Horrocks, Joanna L., Briggs, Roger M., Kamp, Peter J.J.   +5 more
core  

Volcanology and geochemistry of the Kaingaroa Ignimbrite, Taupo Volcanic Zone, New Zealand. [PDF]

, 1997
The 0.23 Ma Kaingaroa Ignimbrite is a composite multiple flow-unit ignimbrite erupted from Reporoa Caldera, Taupo Volcanic Zone (TVZ), New Zealand. The Kaingaroa Ignimbrite has a complex internal stratigraphy with a complex basal tephra sequence of ...
Beresford, Stephen Willis, Stephen Willis Beresford   +1 more
core   +1 more source

Zeolitization and feldspathization processes of the Campanian Ignimbrite, southern Italy

, 2021
The Campanian Ignimbrite formed the Campi Flegrei caldera, located to the west of Naples, Italy, at about 39 ka. The dilute pyroclastic density current, which had an emplacement temperature above 580 ºC, surmounted high topography (over 1400 m) and ...
Laplant, Paige Elizabeth
core   +1 more source

Phylogenetic and Functional Substrate Specificity for Endolithic Microbial Communities in hyper-arid environments

Frontiers in Microbiology, 2016
Under extreme water deficit, endolithic (inside rock) microbial ecosystems are considered environmental refuges for life in cold and hot deserts, yet their diversity and functional adaptations remain vastly unexplored.
Alexander eCrits-Christoph, Courtney K Robinson, Bing eMA, Jacques eRavel, Jacek eWierzchos, Carmen eAscaso, Octavio eArtieda, Virginia eSouza-Egipsy, Cristina eCasero, Jocelyne eDiRuggiero   +9 more
doaj   +1 more source

A submarine welded ignimbrite - crystal-rich sandstone facies association in the Cambrian Tyndall Group, western Tasmania, Australia

, 1997
Three occurrences of rhyolitic welded ignimbrite are intercalated within a submarine, below-storm-wave-base sedimentary succession in the Cambrian Tyndall Group, Mount Read Volcanics, western Tasmania.
White, MJ (15480224), Jocelyn McPhie (14744104)   +1 more
core  

Ignimbrite powder and some other pozzolanas additions to avoid concrete expansion caused by the alkali-silica reaction

, 2013
IGNIMBRITE POWDER AND SOME OTHER POZZOLANAS ADDITIONS TO AVOID CONCRETE EXPANSION CAUSED BY THE ALKALI SILICA REACTION Cement-Wapno-Beton, Vol. XVIII/LXXX, 2013, No 2, p.
Gokce, H. Suleyman, Simse, Osman
core   +1 more source

Isotopic evidence for open system processes within the Campanian Ignimbrite (Campi Flegrei–Italy) magma chamber

, 2009
New Sr and Nd isotope data for whole rocks, glasses and minerals are combined to reconstruct the nature and origin of mixing end-members of the 200 km3 trachytic to phonolitic Campanian Ignimbrite (Campi Flegrei, Italy) magmatic system.
Heumann, I., Arienzo, I., Orsi, G., Wörner, G., Civetta, L.   +4 more
core   +1 more source

Synthesis and Characterization of a Photocatalytic Material from TiO₂ Nanoparticles Supported on Zeolite Obtained from Ignimbrite Residue Used in Decolorization of Methyl Orange

Applied Sciences
In the present work, a TiO2/zeolite photocatalyst was synthesized by dispersing TiO2 nanoparticles obtained through the sol-gel method onto the surface of natural zeolite derived from ignimbrite residue. The zeolite was obtained from an ignimbrite rubble
Gianina Huayna, Antonio Laura, Rossibel Churata, Luis Lazo, Rivalino Guzmán, Pierre G. Ramos, Juan M. Rodriguez   +6 more
doaj   +1 more source

Construction of a thermal demagnetization oven, and investigations on the Matahina ignimbrite

, 1964
A non-magnetic oven, and its ancillary equipment have been constructed and used to study magnetic properties of the Matahina ignimbrite, for which the following results have been established: 1.
Hoare, Raymond Alan (11650462), Hoare, Raymond Allan (11682277), null null, Raymond Allan Hoare   +3 more
core   +1 more source

DEM based examination of pediment levels: a case study in Bükkalja, Hungary

Hungarian Geographical Bulletin, 2011
Bükkalja is the southern pediment of Bükk Mountains. According to the geographic literature this area is divided into two pediment (geomorphic) levels.
János Vágó, András Hegedűs
doaj