Results 41 to 50 of about 87,697 (345)

Role of syn-eruptive plagioclase disequilibrium crystallization in basaltic magma ascent dynamics

Nature Communications, 2016
Timescales of magma ascent in conduit models are typically assumed to be much longer than crystallization and gas exsolution for basaltic eruptions. However, it is now recognized that basaltic magmas may rise fast enough for disequilibrium processes to ...
G. Spina, M. Burton, M. Vitturi, F. Arzilli   +3 more
semanticscholar   +1 more source

Lithium in felsic magmas: a volcanological perspective

Frontiers in Earth Science, 2023
Volcanic eruptions are unpredictable phenomena that pose a challenge to crisis management, owing to the fact that contrasted eruptive styles (explosive versus effusive) exhibited at the surface depend on unobservable deep processes occurring in the ...
Maylis Dupont de Dinechin, Maylis Dupont de Dinechin, Hélène Balcone-Boissard, Caroline Martel, Monika Rusiecka   +4 more
doaj   +1 more source

Complex examination of the Upper Paleozoic siliciclastic rocks from southern Transdanubia, SW Hungary—Mineralogical, petrographic, and geochemical study [PDF]

, 2007
A vertical section of Upper Paleozoic sandstones from southern Transdanubia (Mecsek-Villány area, Tisza mega-unit, Hungary) has been analyzed for major and trace elements, including rare earth elements (REEs).
Á, Arribas, Awdankiewicz, Balogh, Bauluz, Bhatia, Bhatia, Biscaye, Brü, Cox, Csontos, Csontos, Csontos, Cullers, Cullers, Fazekas, Fedo, Gaillardet, Garver, Golonka, Haas, Huang, Kü, Lee, Nagy, Nesbitt, Noda, Pearce, Preston, Varga, Varga, Varga, Varga, Watanabe, Willan, Zimmermann   +35 more
core   +1 more source

Rapakivi texture in porphyritic dikes within the Karavanke granitic massif (Slovenia) [PDF]

Bulletin of the Geological Society of Finland, 2002
The northern Karavanke Granitic Massif straddles the Slovenian–Austrian border. The investigated area lies in northern Slovenia, and extends from the western Slovenian–Austrian border to the east for about 30 km, with a maximum width of 2 km.
M. Dobnikar, T. Dolenec, G. Bellieni
doaj   +1 more source

A Two-Step K-Ar Experiment on Mars: Dating the Diagenetic Formation of Jarosite from Amazonian Groundwaters [PDF]

, 2017
Following K-Ar dating of a mudstone and a sandstone, a third sample has been dated by the Curiosity rover exploring Gale Crater. The Mojave 2 mudstone, which contains relatively abundant jarosite, yielded a young K-Ar bulk age of 2.57 ± 0.39 Ga (1σ ...
Amirkhanoff, Anderson, Bibring, Bischoff, Bish, Blake, Bogard, Bridges, Bristow, Brophy, Cannon, Cassata, Cassata, Changela, Deer, Dehouck, Dekov, Dutrizac, Dutrizac, Ehlmann, Ehlmann, Evernden, Farley, Fassett, Freissinet, Glavin, Gombosi, Grant, Grotzinger, Grotzinger, Halliday, Hamilton, Hartmann, Hartmann, Hartmann, Hassanipak, Hicks, Humayun, Kula, Lee, Leitner, Lofgren, Madden, Mahaffy, Martín-Torres, McEwen, McEwen, McEwen, McSween, Mees, Ming, Minitti, Morris, Morrison, Nachon, Nachon, Nimmo, Nyquist, Ojha, Ojha, Papike, Rampe, Renne, Renne, Robbins, Schwenzer, Siebach, Singer, Smits, Stack, Sutter, Swindle, Thomson, Treiman, Treiman, Treiman, Vaniman, Vasconcelos, Vasconcelos, Wolff-Boenisch   +79 more
core   +2 more sources

Two generations of scapolite at Snezhnoe ruby deposit, Central Pamir

Известия высших учебных заведений: Геология и разведка, 2017
At Snezhnoe ruby deposit, localized in the eastern part of the tectonic zone of Central Pamir, two generations of sсapolite have been discovered by the textural and structural features.
A. K. Litvinenko, S. B. Moiseeva, D. D. Sharifi   +2 more
doaj   +1 more source

Experimental Constraints on Homogenization of Plagioclase-Hosted Melt Inclusions From Plagioclase Ultraphyric Basalts

Frontiers in Earth Science, 2021
Study of melt inclusions (MIs) is a commonly applied method for defining the composition of magmas present at depth prior to mixing, fractionation, and degassing. Our ability to use data from MIs is complicated by post-entrapment processes (PEP) that can
Kristen R. Lewis, Gokce K. Ustunisik, Gokce K. Ustunisik, Roger L. Nielsen, Roger L. Nielsen   +4 more
doaj   +1 more source

Creep properties and constitutive model of diabase in deep water conveyance tunnels

Deep Underground Science and Engineering, EarlyView.
The axial and lateral creep characteristics of diabase were analyzed based on compression creep tests. The nonlinear viscoelastic‐plastic model capable of describing the whole creep process was established based on the fractional derivative and damage theories.
Zhigang Tao, Pengxiao Guan, Xiaojie Yang, Keyuan Liu, Mingjiu Cai, Hong Yang   +5 more
wiley   +1 more source

Insights Into the Eruptive Dynamics of Small Caldera-Forming Eruptions: The Case Study of the Welded Scoriae of Vulcano (Aeolian Islands, Italy)

Frontiers in Earth Science, 2020
A multi-disciplinary study, integrating volcanological field observations, petrography, whole rock geochemistry and textural and compositional analyses on plagioclase crystals has been carried out on the products of Monte Luccia, Spiaggia Lunga, and ...
Eugenio Nicotra, Marta Minniti, Paola Donato, Rosanna De Rosa   +3 more
doaj   +1 more source

Geological and geotechnical challenges on the Great Dyke of Zimbabwe and their impact on hardrock pillar design

Deep Underground Science and Engineering, EarlyView.
The Great Dyke of Zimbabwe is notable for its rich platinum group metal deposits but poses significant geological and geotechnical challenges due to its complex rock types and structural features. Traditional pillar design methods are insufficient for addressing these complexities; the study suggests incorporating advanced techniques such as machine ...
Tawanda Zvarivadza, Hendrik Grobler, Moshood Onifade, Manoj Khandelwal   +3 more
wiley   +1 more source