Results 81 to 90 of about 5,185 (202)

Rapid caldera subsidence and fluctuating eruption dynamics: the lithostratigraphy and structure of the Loch Bà Caldera, Isle of Mull, NW Scotland

Volcanica
Caldera-forming eruptions represent extremely hazardous events. The Loch Bà Caldera on the Isle of Mull, NW Scotland, preserves an ~120 m thick sequence of Palaeogene silicic pyroclastic rocks and collapse breccias.
Peter Nicholls, David Brown, Ross Dymock
doaj   +1 more source

Constraints on the Age of a Miocene Ignimbrite in the Western Mojave Desert

, 2016
Volcaniclastic deposits in the western Mojave Desert record a gradual change from lacustrine to fluvial and subaerial depositional environments, contemporaneous with volcanism that continued throughout and after the transition from fluvial to subaerial ...
Rojas Salazar, Edith Carolina
core  

Magnetostratigraphy of the volcanic sequence of Río Grande de Santiago-Sierra de la Primavera region, Jalisco, western Mexico [PDF]

Geofísica Internacional, 2000
New paleomagnetic results for 13 sites in volcanic units from Huaxtla, Paso de Guadalupe and Lazo sections in the Río Grande de Santiago (RGS) canyon and for 5 sites in the silicic center of Sierra de la Primavera (SP) are used to document a preliminary ...
S. Sánchez Reyes, S. Venegas Salgado, C. Caballero Miranda, A.M. Soler Arechalde, A. Goguitchaichvili, O. Campos Enríquez, L. M. Alva Valdivia, J. Rosas Elguera, J. Urrutia Fucugauchi   +8 more
doaj  

Lithostratigraphic analysis and geochemistry of a vitric spatter-bearing ignimbrite: the Quaternary Adeje Formation, Cañadas volcano, Tenerife [PDF]

, 2013
"The 1.5-Ma Adeje Formation in SW Tenerife contains an ignimbrite sheet with remarkable textural and chemical complexity. A basal Plinian pumice-fall layer is overlain by a partly welded compound ignimbrite in which phonolitic pumice lapilli and dense ...
Carrasco Núñez, Gerardo, Dávila Harris, Pablo   +1 more
core   +1 more source

How cold was the Peperino Albano (Colli Albani, central Italy) phreatomagmatic ignimbrite? A paleomagnetic study to estimate the emplacement temperatures.

, 2004
Recent developments in the paleomagnetic estimation of emplacement temperature of volcanic rocks have shown that such technique can be successfully applied also to relatively cold pyroclastic flow deposits.The 23 ka old Peperino Albano ignimbrite is a ...
MCCLELLAND E., PORRECA, MASSIMILIANO, GIORDANO, Guido, MACNIOCAILL C., MATTEI, Massimo   +4 more
core  

Paleomagnetic results for the Middle-Miocene continental Suchilquitongo Formation, Valley of Oaxaca, southeastern Mexico [PDF]

Geofísica Internacional, 2001
The Suchilquitongo Formation of the northeastern Valley of Oaxaca is a thick sequence of thin-bedded tuffaceous sandstones and siltstones, which locally contain Hemingfordian mammal fauna, and interbedded lacustrine limestones and rhyolitic tuffs (Etla ...
I. Ferrusquía-Villafranca, J. Urrutia-Fucugauchi   +1 more
doaj  

Determining magmatic volatile contributions to the Campanian Ignimbrite, Italy

, 2021
The trachytic Campanian Ignimbrite was emplaced at 39.8 ka near Naples, Italy, in the largest European eruption of the past 200 ka. Many factors, including the far-reaching extent of deposits, with co-ignimbrite fallout found as far away as Russia ...
Murray, Allyson
core   +1 more source

Modeling pedogenization of zeolitized tuffs. II: effect of water and phenolic substances on weathering rates of Campanian Ignimbrite (yellow facies)

, 2010
Sperimentazione sulla pedogenesi di suoli da tufi zeolitizzati (ignimbrite ...
Grilli E., Buondonno A., Coppola E., Langella A., COLELLA, ABNER   +4 more
core  

A long postglacial rhyolitic activity of the Icelandic Krafla volcano during the Eemian: limited impact of glacio-isostasy

BSGF - Earth Sciences Bulletin
Tephrostratigraphy in marine cores is an important tool for dating sedimentary sequences along the North Atlantic and in Western Europe. Most previously analyzed marine tephra were produced by Icelandic volcanoes, albeit rarely from the Krafla volcano ...
Van Vliet-Lanoë Brigitte, Bergerat Françoise, Liorzou Céline, Nonnotte Philippe, Guðmundsson Ágúst   +4 more
doaj   +1 more source

Rheomorphic structures in a high-grade ignimbrite: The Nuraxi tuff, Sulcis volcanic district (SW Sardinia, Italy)

, 2005
Deposits of the 15.8 Ma Nuraxi explosive eruption crop out in the Sulcis volcanic district, southwestern Sardinia. They consist of a decimeter-thick pumice fallout layer overlain, with no apparent temporal break, by several tens of meters thick, high ...
Pioli, Laura, L. PIOLI, ROSI, MAURO
core   +1 more source