Letteratura scientifica selezionata sul tema "Alkali-rich felsic magmas"
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Articoli di riviste sul tema "Alkali-rich felsic magmas":
Marr, R. A. "Alkali Zirconosilicate Speciation in Halogen-Rich, Felsic, Peralkaline Magmas". Mineralogical Magazine 58A, n. 2 (1994): 559–60. http://dx.doi.org/10.1180/minmag.1994.58a.2.28.
PIMENTEL, MÁRCIO M., ELTON L. DANTAS, REINHARDT A. FUCK e RICHARD A. ARMSTRONG. "Shrimp and conventional U-Pb age, Sm-Nd isotopic characteristics and tectonic significance of the K-rich Itapuranga suite in Goiás, Central Brazil". Anais da Academia Brasileira de Ciências 75, n. 1 (marzo 2003): 97–108. http://dx.doi.org/10.1590/s0001-37652003000100011.
Stolz, A. J. "Fluid activity in the lower crust and upper mantle: mineralogical evidence bearing on the origin of amphibole and scapolite in ultramafic and mafic granulite xenoliths". Mineralogical Magazine 51, n. 363 (dicembre 1987): 719–32. http://dx.doi.org/10.1180/minmag.1987.051.363.13.
Bédard, Jean H. J., Don M. Francis e John Ludden. "Petrology and pyroxene chemistry of Monteregian dykes: the origin of concentric zoning and green cores in clinopyroxenes from alkali basalts and lamprophyres". Canadian Journal of Earth Sciences 25, n. 12 (1 dicembre 1988): 2041–58. http://dx.doi.org/10.1139/e88-190.
Nekvasil, Hanna, e William Carroll. "Experimental constraints on the compositional evolution of crustal magmas". Earth and Environmental Science Transactions of the Royal Society of Edinburgh 87, n. 1-2 (1996): 139–46. http://dx.doi.org/10.1017/s0263593300006556.
Rodríguez-García, Gabriel, e Jose Gilberto Bermúdez-Cordero. "Petrography, geochemistry and age of Cerro Frontino Gabro". Boletín de Ciencias de la Tierra, n. 38 (1 luglio 2015): 25–40. http://dx.doi.org/10.15446/rbct.n38.46053.
Khedr, Mohamed Zaki, Gehad M. Saleh, Khaled M. Abdelfadil, Eiichi Takazawa, Kamal Abdelrahman, Akihiro Tamura e Shaimaa Ali El-Shafei. "The Geology and Mineral Chemistry of Beryl Mineralization, South Eastern Desert, Egypt: A Deeper Insight into Genesis and Distribution". Minerals 14, n. 5 (28 aprile 2024): 465. http://dx.doi.org/10.3390/min14050465.
Archibald, D. B., S. M. Barr, J. B. Murphy, C. E. White, T. G. MacHattie, E. A. Escarraga, M. A. Hamilton e C. R. M. McFarlane. "Field relationships, petrology, age, and tectonic setting of the Late Cambrian–Ordovician West Barneys River Plutonic Suite, southern Antigonish Highlands, Nova Scotia, Canada". Canadian Journal of Earth Sciences 50, n. 7 (luglio 2013): 727–45. http://dx.doi.org/10.1139/cjes-2012-0158.
El-Dokouny, Hanaa A., Nasser M. Mahdy, Hany H. El Hadek, Mabrouk Sami, Rainer Abart, Mohamed S. Ahmed, Tehseen Zafar e Ioan V. Sanislav. "Origin of Amphibole-Biotite-Fluorite-Rich Enclaves from Gabal El-Ineigi Fluorite-Bearing Granite, Central Eastern Desert of Egypt: Insights into Fluoride–Calcium and Silicate Liquid Immiscibility". Minerals 13, n. 5 (13 maggio 2023): 670. http://dx.doi.org/10.3390/min13050670.
Blancher, S. B., P. D'Arco, M. Fonteilles e M. L. Pascal. "Evolution of nepheline from mafic to highly differentiated members of the alkaline series: the Messum complex, Namibia". Mineralogical Magazine 74, n. 3 (giugno 2010): 415–32. http://dx.doi.org/10.1180/minmag.2010.074.3.415.
Tesi sul tema "Alkali-rich felsic magmas":
Faranda, Carmela Federica. "Behavior of halogens (Cl, Br, I) in alkali-rich felsic magmas at crustal depth : an experimental approach". Electronic Thesis or Diss., Orléans, 2023. http://www.theses.fr/2023ORLE1066.
The behavior of halogens (F, Cl, Br and I) in magmatic systems is far from being clearly understood. The scientific community has only a fragmentary understanding of the processes that influence the behaviour of these elements during magma storage and ascent to the surface. Recent studies of heavy halogens (Br and I) behaviour have focused mainly on subduction-related magmas, in the context of the geochemical cycle of the halogens from subduction to the atmosphere. Previous studies of halogens solubility (at brine saturation) have shown that felsic, highly-polymerized calc-alkaline melts have lower halogens (except F) solubility than felsic alkali-rich melts. In addition, alkali-rich melts can produce large volume eruptions (e.g., East Africa Rift System), leading to potential massive release of halogens into the atmosphere. Emissions of halogens to the atmosphere are therefore likely to be underestimated, due to the lack of detailed understanding of the behavior of halogens (and in particular bromine and iodine) during magmatic degassing. In this work, we have addressed this gap by experimentally constraining fluid/melt halogen partitioning in felsic alkali-rich systems, with a focus on Br and I, and by a preliminary study of halogens abundances in natural mafic to felsic alkali-rich glasses from different geodynamic contexts. We performed HP-HT experiments (800°-1100 °C; 10 -200 MPa; NNO-0.6 -NNO+3.4) using four melt compositions, with variable SiO2 contents and [(Na₂O+K₂O)/Al₂O₃] molar ratios (natural phonolite, comendite and pantellerite and a synthetic analogue of phonolitic composition). Our results show that melt composition has a strong effect on the partitioning of halogens between fluid and melt. Dhalogens (with Dhalogens = halogen concentration in the fluid phase / halogen concentration in the silicate melt) increases with SiO₂ content and decreases with melt alkalinity, in agreement with the solubility data. We have carried out a systematic investigation of the influence of temperature and pressure on the fluid-melt partitioning of halogens and the results show that temperature has a more pronounced effect on partitioning than pressure. The effect of the redox conditions on halogens fluid/melt partitioning was also explored and the results indicate that DI decreases with decreasing fO₂, whereas DBr and DCl show the opposite effect. We present the first determination of heavy halogens (Br and I) abundances in felsic alkali-rich glasses, with concentrations in the order of ~10 ppm of Br and up to ~1 ppm of I in alkali-rich rhyolites. Iodine concentrations for these melts are at least an order of magnitude higher than concentrations determined by bulk rock analysis of calc-alkaline volcanic rocks in previous studies, highlighting the need for further quantification of heavy halogens in magmas to better assess their atmospheric emission and impact
Capitoli di libri sul tema "Alkali-rich felsic magmas":
Frost, Carol D., e B. Ronald Frost. "Petrologic constraints on the origin of Proterozoic ferroan granites of the Laurentian margin". In Laurentia: Turning Points in the Evolution of a Continent. Geological Society of America, 2022. http://dx.doi.org/10.1130/2022.1220(10).
Smith, Alan L., M. John Roobol, Glen S. Mattioli, George E. Daly e Joan E. Fryxell. "Providencia Island: A Miocene Stratovolcano on the Lower Nicaraguan Rise, Western Caribbean—A Geological Enigma Resolved". In Providencia Island: A Miocene Stratovolcano on the Lower Nicaraguan Rise, Western Caribbean—A Geological Enigma Resolved, 1–101. Geological Society of America, 2021. http://dx.doi.org/10.1130/2021.1219(01).