Results 41 to 50 of about 2,053 (253)

Variable Sr Diffusion and Implications for Rb–Sr Biotite Geochronology

Journal of Metamorphic Geology, EarlyView.
ABSTRACT The rubidium–strontium (Rb–Sr) system has a long pedigree as a geochronological tool that relies on the application of an isochron approach. In particular, biotite contains strongly radiogenic Rb–Sr isotopes, and thus can yield meaningful crystallisation or cooling ages via this approach. However, the response of the Rb–Sr system in biotite to
Riley Rohrer, Christopher L. Kirkland, Hugo Olierook, Tim Johnson, Katy Evans   +4 more
wiley   +1 more source

P–T Modelling Constrains the Depth of Emplacement of the Porto Azzurro Pluton and Implies Minor Exhumation Caused by the Zuccale Fault (Island of Elba, Italy)

Journal of Metamorphic Geology, EarlyView.
ABSTRACT Understanding the pressure of emplacement of granitic intrusions is crucial to understanding the exhumation history of plutons and constraining the tectonic setting of magma emplacement. However, P–T and geochronological constraints from exhumed plutons are often characterized by large uncertainties, especially in shallow crustal settings with
Samuele Papeschi, Marco Bonini, Matteo Lupi, Chiara Del Ventisette, Domenico Montanari   +4 more
wiley   +1 more source

Aeolian Remobilisation of the 2011-Cordón Caulle Tephra-Fallout Deposit: Example of an Important Process in the Life Cycle of Volcanic Ash

Frontiers in Earth Science, 2020
Although volcanic eruptions represent short periods in the whole history of a volcano, the large amount of loose pyroclastic material produced, combined with aeolian processes, can lead to continuous, long-lasting reworking of volcanic products.
Lucia Dominguez, Costanza Bonadonna, Pablo Forte, Pablo Forte, Paul Antony Jarvis, Raffaello Cioni, Leonardo Mingari, Donaldo Bran, Juan Esteban Panebianco   +8 more
doaj   +1 more source

Physical volcanology of a subglacial-to-emergent rhyolitic tuya at Rauðufossafjöll, Torfajökull, Iceland

Geological Society, London, Special Publications, 2002
AbstractThis paper presents the first modern volcanological study of a subglacial-to-emergent rhyolite tuya, at SE Rauðufossafjöll, Torfajökull, Iceland. A flat-topped edifice with a volume ofc.1 km3was emplaced in Upper Pleistocene time beneath a glacier >350m thick.
Tuffen, Hugh, McGarvie, David W., Gilbert, Jennie S., Pinkerton, Harry   +3 more
openaire   +2 more sources

Reaction‐Driven Development of Fine‐Grained Plagioclase Networks Influences the Rheology of the Crust in the Bergen Arcs, Norway

Journal of Metamorphic Geology, EarlyView.
ABSTRACT In the middle to lower continental crust, mineral reactions can play a key role in controlling rheological behaviour by generating fine‐grained, mechanically weak domains. In granulite‐facies rocks from Krossøy (Bergen Arcs, Norway), we document how garnet breakdown produced interconnected networks of orthopyroxene + plagioclase ± spinel that ...
Lorena H. Filiberto, Håkon Austrheim, José Alberto Padrón‐Navarta, Andrew Putnis, Christine V. Putnis   +4 more
wiley   +1 more source

Volcanotectonics: the tectonics and physics of volcanoes and their eruption mechanics [PDF]

, 2022
International audienceThe physical processes that operate within, and beneath, a volcano control the frequency, duration, location and size of volcanic eruptions.
Kusumoto, Shigekazu, Martí Molist, Joan, Geshi, Nobuo, Heap, Michael J., Pinel, V, Thordarson, Thorvaldur, Elshaafi, A, Bonali, Fabio L., Tibaldi, A, Geyer, Adelina, Acocella, V, Kusumoto, S, Bonali, Fabio, Karaoglu, O, Elshaafi, Abdelsalam, Walter, Thomas R., Browning, J, Galindo, I, Marti, J, Marti, Joa, Pinel, Virginie, Geshi, N, Bonali, FL, Galindo Jiménez, Inés, Bonali, Fabio, L, Tibaldi, Alessandro, Acocella, Valerio, Geyer, A, Galindo, Ines, Amelung, Falk, Karaoğlu, Özgür, Gudmundsson, A, Thordarson, T, Gudmundsson, Agust, Walter, Thomas, R, Browning, John, Marti, Joan, Heap, Michael, J, Amelung, F, Heap, MJ, Drymoni, Kyriaki, Heap, Michael, Drymoni, K, Walter, TR, Walter, Thomas   +44 more
core   +1 more source

Water content and iron oxidation state analysis of silicate glass using the electron probe [PDF]

EPJ Web of Conferences
The water content (H2O) and iron oxidation state (Fe3+/FeT) of silicate glass are useful compositional parameters to measure in volcanology and igneous petrology due to: (1) their influence on the chemical and physical properties of magmas, and (2) their
Hughes Ery, Buse Ben, Kearns Stuart, Kilgour Geoff, Blundy Jon   +4 more
doaj   +1 more source

Physical volcanology of continental large igneous provinces: update and review [PDF]

, 2018
Large igneous provinces (LIPs) form in both oceanic and continental settings by the emplacement and eruption of voluminous magmas ranging from basalt to rhyolite in composition. Continental flood basalt provinces are the best studied LIPs and consist of crustal intrusive systems, extensive flood lavas and ignimbrites, and mafic volcaniclastic deposits ...
White, James D. L., Bryan, Scott E., Ross, Pierre-Simon, Self, Stephen, Thordarson, Thorvaldur   +4 more
openaire   +2 more sources

A review of the supercritical state of eruption‐fed volcanic density currents in subaerial and subaqueous settings

Sedimentology, EarlyView.
ABSTRACT Subaerial Pyroclastic Density Currents (PDCs) and Subaqueous Eruption‐Fed Density Currents (SEFDCs) produced during volcanic eruptions can present major hazards to surrounding communities and ecosystems. The bedforms deposited by these volcanic density currents can provide insights into the nature of transport and depositional processes, which
Shannon E. Frey, Martin Jutzeler, Rebecca J. Carey   +2 more
wiley   +1 more source

Cenozoic structural evolution of the southwestern Bükk Mts. and the southern part of the Darnó Deformation Belt (NE Hungary)

Geologica Carpathica, 2016
Extensive structural field observations and seismic interpretation allowed us to delineate 7 deformation phases in the study area for the Cenozoic period.
Petrik Attila, Beke Barbara, Fodor László, Lukács Réka   +3 more
doaj   +1 more source