Results 41 to 50 of about 3,716 (202)

Managing and visualising geochemical data for tephra correlation with the IntChron Integration Tool

Journal of Quaternary Science, EarlyView.
ABSTRACT There is now a wealth of glass‐shard geochemical data for volcanic ash (tephra) layers from a wide range of volcanoes and eruptions, providing invaluable datasets for tephrochronology. However, compilation of published data to assess tephra correlations leads to large files and requires careful management.
Victoria C. Smith, Danielle McLean, Eloise Wilkinson‐Rowe, Emma L. Horn, Gavin Kane, Christopher Bronk Ramsey   +5 more
wiley   +1 more source

Carbon isotope geochemistry of organic matter in volcanic paleosols constrains paleo‐environmental variations

Journal of Quaternary Science, EarlyView.
ABSTRACT The Fiorano quarry paleosol developed within the Colli Albani volcanic district (Italy) in the time interval bracketed by the deposition of the Pozzolanelle pyroclastic‐flow unit (365 ± 4 ka) and the emplacement of the Capo di Bove lava flow (277 ± 2 ka).
Eduardo Di Marcantonio, Luca Aldega, Luigi Dallai, Mario Gaeta, Fabrizio Marra   +4 more
wiley   +1 more source

Thermal impact of dykes on ignimbrite and implications for fluid flow channelisation in a caldera

Volcanica, 2022
Ignimbrites within calderas host intrusions with hazardous and/or economically significant hydrothermal systems. The Hvítserkur ignimbrite at Breiðuvík caldera, north-eastern Iceland, is intruded by basaltic dykes.
Ben Kennedy, Michael Heap, Steffi Burchardt, Marlène Villeneuve, Hugh Tuffen, H. Albert Gilg, Jonathan Davidson, Neryda Duncan, Elodie Saubin, Einar Bessi Gestsson, Marzieh Anjomrouz, Philip Butler   +11 more
doaj   +1 more source

Transport and emplacement of ignimbrites and resedimented volcaniclastics from Gutai Mts., Eastern Carpathians, Romania

, 2012
Gutâi Mts. had started to be built up in Middle Miocene, ca. 15.4 Ma ago. A series of explosive events developed starting with a major magmatic explosion and caldera collapse responsible for large volumes of ignimbrites.
Fülöp, Alexandrina
core   +1 more source

High‐resolution three‐dimensional ground‐penetrating radar imaging of surface masonry arrangement in frescoed Roman walls at Pompeii

Near Surface Geophysics, EarlyView.
Abstract The widespread presence of frescoes in newly excavated domus at Pompeii conceals the wall masonry arrangement, preventing direct geometric survey while excluding invasive diagnostic approaches. Reliable knowledge of masonry geometry is nonetheless essential for structural assessment and conservation planning in a seismically active region ...
Sara Donzelli, Lorenza Petrini, Stefano Munda, Maurizio Lualdi   +3 more
wiley   +1 more source

Rare Earth Element Potential in the Araí Rift Metavolcanic, Central Brazil: Gamma‐Ray Signatures, Mineralogy and Exploration Implications

Terra Nova, EarlyView.
ABSTRACT Although central Brazil hosts significant ion‐adsorption rare earth element (REE) deposits associated with A‐type granites, their coeval volcanic counterparts have been largely overlooked as exploration targets. This study demonstrates that acidic metavolcanic rocks of the Araí Group share strong radiometric, geochemical and mineralogical ...
Yuri Ribeiro, Nilson Francisquini Botelho, Valmir da Silva Souza, Diego Guilherme da Costa Gomes   +3 more
wiley   +1 more source

Geochemical aspects of Kejal kaolin deposit, northwest of Hashtjin, Ardebil province

Journal of Economic Geology, 2012
Kajal kaolin deposit is located ~20 km northwest of Hashtjin, Ardebil province. Field evidence and laboratory investigations show that the deposit is an alteration product of ignimbrites, tuffs, and trachy-andesites of Eocene age.
Ali Abedini, Rahim Masumi, Ali Asghar Calagari   +2 more
doaj   +3 more sources

Caldera collapse and tectonics along the Main Ethiopian Rift: reviewing possible relationships

Comptes Rendus. Géoscience, 2021
The Main Ethiopian Rift (MER) represents an area where volcanism and tectonics interact to create closely linked volcano-tectonic features. This linkage is paramount in the axial portion of the rift, where magmatic segments localize several large ...
Maestrelli, Daniele, Corti, Giacomo, Bonini, Marco, Montanari, Domenico, Sani, Federico   +4 more
doaj   +1 more source

A re-assessment of the geochronology and geochemistry of the Postberg Ignimbrites, Saldanha, Western Cape, South Africa [PDF]

, 2020
The Saldania Belt in southern Africa, a product of the Pan-African Saldanian Orogeny, forms part of a system of Neoproterozoic mobile belts that border and weld older cratons on the African continent.
Misrole, Matthew
core   +1 more source

The origin and history of alteration and carbonatization of the Yucca Mountain ignimbrites. Volume 2, Appendix B [PDF]

, 1992
A geological history is presented for Yucca Mountain.
Szymanski, J.S., Szymanski, J. S.
core   +1 more source