Results 41 to 50 of about 105,255 (290)

Architecture and dynamics of magma reservoirs

Philosophical Transactions of the Royal Society A, 2019
This introductory article provides a synopsis of our current understanding of the form and dynamics of magma reservoirs in the crust. This knowledge is based on a range of experimental, observational and theoretical approaches, some of which are ...
M. Edmonds, K. Cashman, M. Holness, M. Jackson   +3 more
semanticscholar   +1 more source

Hydrogen Isotope Composition of a Large Silicic Magma Reservoir Preserved in Quartz‐Hosted Glass Inclusions of the Bishop Tuff Plinian Eruption

Geochemistry, Geophysics, Geosystems, 2020
Water controls magmatic crystallization and drives volcanic eruptions, but little is known about its primary source in silicic systems. The hydrogen isotope composition of volcanic products provides a metric that can track and identify magmatic source ...
Kenneth S. Befus, Kristina J. Walowski, Richard L. Hervig, Jeffrey T. Cullen   +3 more
doaj   +1 more source

Magmatic Densities Control Erupted Volumes in Icelandic Volcanic Systems

Frontiers in Earth Science, 2018
Magmatic density and viscosity exert fundamental controls on the eruptibility of magmas. In this study, we investigate the extent to which magmatic physical properties control the eruptibility of magmas from Iceland's Northern Volcanic Zone (NVZ).
Margaret Hartley, Margaret Hartley, John Maclennan   +2 more
doaj   +1 more source

Petrogenetic and geochemical characteristics of some auriferous granitoids in the Kumasi Basin, Ghana: Implications for geodynamic settings and controls of orogenic gold mineralization in the Edikan Gold Mine

Deep Underground Science and Engineering, EarlyView.
The Fobinso granitoids are granodiorites, while the Esuajah granitoids are granites based on their mineralogical composition. The granitoids are generally enriched in LILE and LREE than HFSE, MREE, and HREE, indicating mixing with crustal sources during their evolution.
Emmanuel D. Sunkari, Obed Oppong, Theophilus K. Agbenyezi   +2 more
wiley   +1 more source

Composición química (elementos mayores) de los magmas en el Cinturón Volcánico Mexicano

Geofísica Internacional, 1987
Se presenta una recopilación de 1797 análisis geoquímicos de elementos mayores sobre las rocas ígneas del Cinturón Volcánico Mexicano (CVM). Se analiza el significado geológico de estos datos geoquímicos mediante una serie de histogramas y diagramas ...
V. H. Aguilar y Vargas, S. P. Verma
doaj   +1 more source

Felsic Melt and Gas Mobilization During Magma Solidification: An Experimental Study at 1.1 kbar

Frontiers in Earth Science, 2020
Melt and gas transfer processes are essential to the formation and growth of the Earth’s crust and for sustaining volcanic activity. These processes also play a major role in magma fractionation at shallow depths (<10 km) where magmas stall ...
Mattia Pistone, Mattia Pistone, Lukas P. Baumgartner, Florence Bégué, Paul A. Jarvis, Elias Bloch, Martin Robyr, Othmar Müntener, Thomas W. Sisson, Jon D. Blundy   +9 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

Magma Plumbing Systems: A Geophysical Perspective

Journal of Petrology, 2018
Over the last few decades, significant advances in using geophysical techniques to image the structure of magma plumbing systems have enabled the identification of zones of melt accumulation, crystal mush development, and magma migration.
C. Magee, C. Stevenson, S. Ebmeier, D. Keir, J. Hammond, J. Gottsmann, K. Whaler, N. Schofield, C. Jackson, M. Petronis, B. O’Driscoll, J. Morgan, A. Cruden, S. Vollgger, G. Dering, S. Micklethwaite, M. Jackson   +16 more
semanticscholar   +1 more source

Neoarchean Arc Magmatism and Crust Recycling in the Northern Marginal Zone of the Limpopo Complex, Zimbabwe: New Insights From Zircon U‐Pb‐Hf Isotopes of a Charnockite Suite

Geological Journal, EarlyView.
Charnockites with 2691–2607 Ma magmatic ages from the NMZ show arc‐magmatic geochemical signatures. They correspond to the lower‐crustal equivalent of the Chilimanzi Suite Granite in the Zimbabwe Craton. Lu‐Hf isotopic data of magmatic zircons show negative εHf(t) values (−11.18 to −2.20) with TDMC ages of 3699–3158 Ma, suggesting their protolith ...
Toshiaki Tsunogae, Md. Sazzadur Rahman, Gao Pin, M. Santosh, Wataru Fujisaki, Sam Uthup, Prince Mandingaisa   +6 more
wiley   +1 more source

Density of magmas at depth [PDF]

Chemical Geology, 2016
Knowing the density of silicate liquids at high pressure is essential to answer questions relevant to the presence of magmas at depth, whether that be in the present Earth or in its earliest times, during differentiation of the planet. Melts have unique physical and chemical properties, which vary as a function pressure, and chemical composition.
openaire   +4 more sources