Готові списки джерел за темами / Rhyolite-melts

Добірка наукової літератури з теми "Rhyolite-melts"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Rhyolite-melts"

Baker, L. L., and Malcolm J. Rutherford. "Sulfur diffusion in rhyolite melts." Contributions to Mineralogy and Petrology 123, no. 4 (May 20, 1996): 335–44. http://dx.doi.org/10.1007/s004100050160.

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Bagdassarov, N. S., D. B. Dingwell, and S. L. Webb. "Viscoelasticity of crystal- and bubble-bearing rhyolite melts." Physics of the Earth and Planetary Interiors 83, no. 2 (May 1994): 83–99. http://dx.doi.org/10.1016/0031-9201(94)90066-3.

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Neuville, Daniel R., Philippe Courtial, Donald B. Dingwell, and Pascal Richet. "Thermodynamic and rheological properties of rhyolite and andesite melts." Contributions to Mineralogy and Petrology 113, no. 4 (1993): 572–81. http://dx.doi.org/10.1007/bf00698324.

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Prokofiev, V. Yu, V. B. Naumov, A. E. Roman’ko, A. L. Balashova, P. Yu Plechov, and N. A. Imamverdiyev. "Low-temperature acidic melts of Bazman volcano (Iran)." Доклады Академии наук 485, no. 5 (May 23, 2019): 614–18. http://dx.doi.org/10.31857/s0869-56524855614-618.

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The inclusions of a silicate melt were investigated in quartz insets of the extrusive rhyolite collected at Bazman Cenozoic volcano (Iran) and associated with the process of recent subduction. Low temperatures of the silicate melt along with high concentrations of water in the melt are ascertained. The microelemental composition of the melt showed a similarity to acidic melts of island-arc formations.

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Gualda, G. A. R., M. S. Ghiorso, R. V. Lemons, and T. L. Carley. "Rhyolite-MELTS: a Modified Calibration of MELTS Optimized for Silica-rich, Fluid-bearing Magmatic Systems." Journal of Petrology 53, no. 5 (January 25, 2012): 875–90. http://dx.doi.org/10.1093/petrology/egr080.

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Donaldson, C. H. "Forsterite dissolution in superheated basaltic, andesitic and rhyolitic melts." Mineralogical Magazine 54, no. 374 (March 1990): 67–74. http://dx.doi.org/10.1180/minmag.1990.054.374.06.

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AbstractDissolution rates of small forsterite spheres in superheated melts of basalt, andesite and rhyolite composition have been measured at 1300°C, atmospheric pressure. The rate is constant (83 µm hr−1) in the basalt, regardless of run duration. In the andesite the initial dissolution rate is 200µm hr−1, followed by a decrease to a constant value of 16µmhr−1 in 2–3 hours. Dissolution rate in the rhyolite decreases from an initial value of 1.7 to <0.1 µmhr−1 over 280 hours and never reaches a constant rate. Once the rate of dissolution has become constant, the film of contaminated melt that forms in melt about a crystal does not thicken with time, indicating attainment of a steady-state condition. Steady state is attributed to natural convection arising from the difference in density between the film of contaminated melt surrounding a crystal and that beyond. The density difference is approximately 2% of the density of the rock melt.

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Gardner, James E., and Richard A. Ketcham. "Bubble nucleation in rhyolite and dacite melts: temperature dependence of surface tension." Contributions to Mineralogy and Petrology 162, no. 5 (April 10, 2011): 929–43. http://dx.doi.org/10.1007/s00410-011-0632-5.

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Gardner, James E., Sahand Hajimirza, James D. Webster, and Helge M. Gonnermann. "The impact of dissolved fluorine on bubble nucleation in hydrous rhyolite melts." Geochimica et Cosmochimica Acta 226 (April 2018): 174–81. http://dx.doi.org/10.1016/j.gca.2018.02.013.

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Chamberlain, K. J., J. Barclay, K. J. Preece, R. J. Brown, and J. P. Davidson. "Lower Crustal Heterogeneity and Fractional Crystallization Control Evolution of Small-volume Magma Batches at Ocean Island Volcanoes (Ascension Island, South Atlantic)." Journal of Petrology 60, no. 8 (August 1, 2019): 1489–522. http://dx.doi.org/10.1093/petrology/egz037.

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Abstract Ocean island volcanoes erupt a wide range of magmatic compositions via a diverse range of eruptive styles. Understanding where and how these melts evolve is thus an essential component in the anticipation of future volcanic activity. Here we examine the role of crustal structure and magmatic flux in controlling the location, evolution and ultimately composition of melts at Ascension Island. Located in the South Atlantic, Ascension Island is an ocean island volcano that has produced a continuum of eruptive compositions from basalt to rhyolite in its 1 Myr subaerial eruptive history. Volcanic rocks broadly follow a silica-undersaturated subalkaline evolutionary trend, and new data presented here show a continuous compositional trend from basalt through trachyte to rhyolite. Detailed petrographic observations are combined with in situ geochemical analyses of crystals and glass, and new whole-rock major and trace element data from mafic and felsic pyroclastic and effusive deposits that span the entire range in eruptive ages and compositions found on Ascension Island. These data show that extensive fractional crystallization is the main driver for the production of felsic melts for Ascension Island, a volcano built on thin, young, oceanic crust. Strong spatial variations in the compositions of erupted magmas reveal the role of a heterogeneous lower crust; differing degrees of interaction with a zone of plutonic rocks are responsible for the range in mafic lava compositions, and for the formation of the central and eastern felsic complexes. A central core of nested, small-scale plutonic, or mush-like, bodies inhibits the ascent of mafic magmas, allowing sequential fractional crystallization within the lower crust, and generating felsic magmas in the core of the island. There is no evidence for magma mixing preserved in any of the studied eruptions, suggesting that magma storage regions are transient, and material is not recycled between eruptions.

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Macdonald, R., and B. Bagiński. "The central Kenya peralkaline province: a unique assemblage of magmatic systems." Mineralogical Magazine 73, no. 1 (February 2009): 1–16. http://dx.doi.org/10.1180/minmag.2009.073.1.1.

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The review focuses on the evolution of five contiguous peralkaline salic complexes in the south-central Kenya Rift Valley, stressing new developments of general significance to peralkaline magmatism. The complexes have evolved dominantly by combinations of fractional crystallization and magma mixing; volatile-melt interactions, remobilization of plutonic rocks and crystal mushes, and carbonate-silicate liquid immiscibility have been additional petrogenetic processes. Geochemical and experimental studies have shown that pantelleritic magmas can be generated by fractional crystallization of trachyte and high-silica rhyolite. Melts of comenditic composition were also formed by fractionation of trachyte but also locally by partial meltingof syenites. Studies of apparent partition coefficients have provided some of the first data on element distribution between phenocrysts and peralkaline silicic melts. Compositional zonation has been ubiquitous in the complexes, probably a result of the very low viscosity of the magmas.

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Більше джерел

Дисертації з теми "Rhyolite-melts"

Tregeagle, J.-S. "Petrogenesis and magma chamber evolution of the Gawler Range Volcanics." Thesis, 2014. http://hdl.handle.net/2440/110564.

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This item is only available electronically.
The Gawler Range Volcanics (GRV) have been extensively studied previously, but a source and emplacement mechanism has yet to be agreed upon. This study aims to constrain the source region of the GRV and to make deductions about how the GRV evolved. This has been done through a number of modelling techniques, including AFC modelling and use of the Rhyolite-MELTs program. The εNd values vary widely across the GRV, and these have been used in conjunction with trace element geochemistry to constrain the source region. It is deduced that the most primitive GRV basalts were the result of limited fractionation of a re-enriched refractory harzburgite source in the sub-continental lithospheric mantle. It is then shown that the entire GRV suite can be derived from one fractionation trend, however some assimilation is required.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2014

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Higgie, D. R. "Tectonic provenance of the Palaeoproterozoic Plum Tree Volcanics: implications for the initiation of the McArthur Basin." Thesis, 2018. http://hdl.handle.net/2440/130627.

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The Palaeoproterozoic (1825 ±4Ma) Plum Tree Volcanics are a bimodal suite of basalt and rhyolite lavas forming part of the fluvial conglomerate-sandstone sequence of the upper Edith River Group. They are preserved in remnants unconformably overlying the Pine Creek Orogen north of Katherine in the Edith River, Mt Callanan and Birdie Creek Basins. These sequences directly post-date the convergent deformation of the Pine Creek Orogen and mark the beginning of the extensional regime that initiated the McArthur Basin. The tectonic setting of the Plum Tree volcanism, whether divergent intraplate rift or mantle hotspot, may suggest how the formation of the McArthur Basin began and provide insight into how the Pine Creek Orogen compression ceased. In this paper, geochemical methods were used to determine the tectonic setting of the Plum Tree Volcanics. Whole rock geochemical data were collected via XRF, ICP-MS and ICP-OES. Nd-Sm and Sr isotopic data were collected via column chromatography and TIMS. Petrographic data were collected via optical petrography. Radiogenic Sr (87Sr/86Sr= ~0.708) and non-radiogenic Nd (εNd(i)= -6 to -8) isotopes suggest a crustal component in melt evolution. Modelling of melt evolution by pure fractional crystallisation presents well-fitting liquid lines of descent, suggesting a fractional crystallisation driven melt evolution. Tholeiitic basalts and trace element geochemistry suggests a mantle derived melt driven by a mantle plume and intraplate continental rifting. Modelling of AFC processes suggest a lower crust sourced assimilant. Ambiguous basalt geochemistry supports a continental rift derived melt and an oxygen fugacity of FMQ -1 suggests a primitive, reduced melt reflecting a mantle parent. Optical petrography presents a plagioclase and clinopyroxene rich mineral assemblage reflecting a mantle parent.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2018

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Тези доповідей конференцій з теми "Rhyolite-melts"

Polk, Raven, and John C. White. "MODELLING THE METALUMINOUS TRACHYTE TO PERALKALINE RHYOLITE TRANSITION USING THE RHYOLITE-MELTS ALGORITHM." In 54th Annual GSA North-Central Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020nc-348117.

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Antoshechkina, Paula, Amy J. V. Riches, Alexander Popov, and Paul D. Asimow. "Revisiting Namibian Magmatism with Rhyolite-Melts and the Magma Chamber Simulator." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.73.

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Saunders-Shultz, Che Pablo, Lydia J. Harmon, Darren Gravley, and Guilherme A. R. Gualda. "TRACING MELT PATHWAYS OF THE WHAKAMARU SUPERERUPTIONS WITH RHYOLITE-MELTS GEOBAROMETRY IN PUMICE WHOLE-ROCK AND GLASS." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-324471.

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Pamukcu, Ayla S., Kylie A. Wright, Guilherme A. R. Gualda, and Darren M. Gravley. "ERUPTIVE PROCESSES AND MAGMA RESIDENCE AT THE TAUPO VOLCANIC CENTER (NEW ZEALAND): INSIGHTS FROM RHYOLITE-MELTS GEOBAROMETRY, DIFFUSION CHRONOMETRY, AND CRYSTAL TEXTURES." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-321628.

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Звіти організацій з теми "Rhyolite-melts"

Piercey, S. J., and J. L. Pilote. Nd-Hf isotope geochemistry and lithogeochemistry of the Rambler Rhyolite, Ming VMS deposit, Baie Verte Peninsula, Newfoundland: evidence for slab melting and implications for VMS localization. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328988.

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New high precision lithogeochemistry and Nd and Hf isotopic data were collected on felsic rocks of the Rambler Rhyolite formation from the Ming volcanogenic massive sulphide (VMS) deposit, Baie Verte Peninsula, Newfoundland. The Rambler Rhyolite formation consists of intermediate to felsic volcanic and volcaniclastic rocks with U-shaped primitive mantle normalized trace element patterns with negative Nb anomalies, light rare earth element-enrichment (high La/Sm), and distinctively positive Zr and Hf anomalies relative to surrounding middle rare earth elements (high Zr-Hf/Sm). The Rambler Rhyolite samples have epsilon-Ndt = -2.5 to -1.1 and epsilon-Hft = +3.6 to +6.6; depleted mantle model ages are TDM(Nd) = 1.3-1.5 Ga and TDM(Hf) = 0.9-1.1Ga. The decoupling of the Nd and Hf isotopic data is reflected in epsilon-Hft isotopic data that lies above the mantle array in epsilon-Ndt -epsilon-Hft space with positive ?epsilon-Hft values (+2.3 to +6.2). These Hf-Nd isotopic attributes, and high Zr-Hf/Sm and U-shaped trace element patterns, are consistent with these rocks having formed as slab melts, consistent with previous studies. The association of these slab melt rocks with Au-bearing VMS mineralization, and their FI-FII trace element signatures that are similar to rhyolites in Au-rich VMS deposits in other belts (e.g., Abitibi), suggests that assuming that FI-FII felsic rocks are less prospective is invalid and highlights the importance of having an integrated, full understanding of the tectono-magmatic history of a given belt before assigning whether or not it is prospective for VMS mineralization.

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