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Articles de revues sur le sujet « Volatile in magmas »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

Esposito, Rosario, Daniele Redi, Leonid V. Danyushevsky, et al. "Constraining the volatile evolution of mafic melts at Mt. Somma–Vesuvius, Italy, based on the composition of reheated melt inclusions and their olivine hosts." European Journal of Mineralogy 35, no. 6 (2023): 921–48. http://dx.doi.org/10.5194/ejm-35-921-2023.

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Abstract. Mount Somma–Vesuvius is a stratovolcano that represents a geological hazard to the population of the city of Naples and surrounding towns in southern Italy. Historically, volcanic eruptions at Mt. Somma–Vesuvius (SV) include high-magnitude Plinian eruptions, such as the infamous 79 CE eruption that occurred after 295 years of quiescence and killed thousands of people in Pompeii and surrounding towns and villages. The last eruption at SV was in 1944 and showed a Volcanic Explosivity Index (VEI) of 3 (0.01 km3 of volcanic material erupted). Following the 1944 eruption, SV has been dorm

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Chen, Zuxing, Landry Soh Tamehe, Haiyan Qi, Yuxiang Zhang, Zhigang Zeng, and Mingjiang Cai. "Using Apatite to Track Volatile Evolution in the Shallow Magma Chamber below the Yonaguni Knoll IV Hydrothermal Field in the Southwestern Okinawa Trough." Journal of Marine Science and Engineering 11, no. 3 (2023): 583. http://dx.doi.org/10.3390/jmse11030583.

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The Yonaguni Knoll IV is an active seafloor hydrothermal system associated with submarine silicic volcanism located in the “cross back-arc volcanic trail” (CBVT) in the southwestern Okinawa Trough. However, the behavior of volatiles during magmatic differentiation in the shallow silicic magma chamber is unclear. Here, the volatile contents of apatite inclusions trapped in different phenocrysts (orthopyroxene and amphibole) and microphenocrysts in the rhyolite from the Yonaguni Knoll IV hydrothermal field were analyzed by using electron microprobe analysis, which aims to track the behavior of v

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Degruyter, Wim, Andrea Parmigiani, Christian Huber, and Olivier Bachmann. "How do volatiles escape their shallow magmatic hearth?" Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2139 (2019): 20180017. http://dx.doi.org/10.1098/rsta.2018.0017.

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Only a small fraction (approx. 1–20%) of magmas generated in the mantle erupt at the surface. While volcanic eruptions are typically considered as the main exhaust pipes for volatile elements to escape into the atmosphere, the contribution of magma reservoirs crystallizing in the crust is likely to dominate the volatile transfer from depth to the surface. Here, we use multiscale physical modelling to identify and quantify the main mechanisms of gas escape from crystallizing magma bodies. We show that most of the outgassing occurs at intermediate to high crystal fraction, when the system has re

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Perinelli, Cristina, Silvio Mollo, Mario Gaeta, Serena De Cristofaro, Danilo Palladino, and Piergiorgio Scarlato. "Impulsive Supply of Volatile-Rich Magmas in the Shallow Plumbing System of Mt. Etna Volcano." Minerals 8, no. 11 (2018): 482. http://dx.doi.org/10.3390/min8110482.

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Magma dynamics at Mt. Etna volcano are frequently recognized as the result of complex crystallization regimes that, at shallow crustal levels, unexpectedly change from H2O-undersaturated to H2O-saturated conditions, due to the impulsive and irregular arrival of volatile-rich magmas from mantle depths. On this basis, we have performed hydrous crystallization experiments for a quantitative understanding of the role of H2O in the differentiation of deep-seated trachybasaltic magmas at the key pressure of the Moho transition zone. For H2O = 2.1–3.2 wt %, the original trachybasaltic composition shi

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Rasmussen, Daniel J., Terry A. Plank, Diana C. Roman, and Mindy M. Zimmer. "Magmatic water content controls the pre-eruptive depth of arc magmas." Science 375, no. 6585 (2022): 1169–72. http://dx.doi.org/10.1126/science.abm5174.

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Vanguard efforts in forecasting volcanic eruptions are turning to physics-based models, which require quantitative estimates of magma conditions during pre-eruptive storage. Below active arc volcanoes, observed magma storage depths vary widely (~0 to 20 kilometers) and are commonly assumed to represent levels of neutral buoyancy. Here we show that geophysically observed magma depths (6 ± 3 kilometers) are greater than depths of neutral buoyancy, ruling out this commonly assumed control. Observed depths are instead consistent with predicted depths of water degassing. Intrinsically wetter magmas

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Nizametdinov, I. R., D. V. Kuzmin, S. Z. Smirnov, A. V. Rybin, and I. Yu Kulakov. "Water in parental basaltic magmasof the Menshiy Brat volcano (Iturup Island, Kurile islands)." Доклады Академии наук 486, no. 1 (2019): 93–97. http://dx.doi.org/10.31857/s0869-5652486193-97.

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The paper presents study of the liquidus assemblage of olivine and spinel in high-magnesian basalts (MgO up to 10 mas. %) of the Menshiy Brat volcano (Iturup Island). It was possible to reconstruct the water content and evolution of volatile components in the primary parental magmas that took part in the formation of the Medvezhya Caldera, Iturup Islands. It is shown that the initial water content in the primary melts could reach 5 mas. % with oxygen fugacity corresponding to oxygen buffer NNO + 0.4 log. units. The evolution of magmas involved continuous degassing while magma rises to the surf

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Russell, J. Kelly, R. Stephen J. Sparks, and Janine L. Kavanagh. "Kimberlite Volcanology: Transport, Ascent, and Eruption." Elements 15, no. 6 (2019): 405–10. http://dx.doi.org/10.2138/gselements.15.6.405.

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Kimberlite rocks and deposits are the eruption products of volatile-rich, silica-poor ultrabasic magmas that originate as small-degree mantle melts at depths in excess of 200 km. Many kimberlites are emplaced as subsurface cylindrical-to-conical pipes and associated sills and dykes. Surficial volcanic deposits of kimberlite are rare. Although kimberlite magmas have distinctive chemical and physical properties, their eruption styles, intensities and durations are similar to conventional volcanoes. Rates of magma ascent and transport through the cratonic lithosphere are informed by mantle cargo

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Boudreau, Alan E. "The Stillwater Complex, Montana – Overview and the significance of volatiles." Mineralogical Magazine 80, no. 4 (2016): 585–637. http://dx.doi.org/10.1180/minmag.2016.080.063.

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AbstractThe geology of the 2.7 Ga Stillwater Complex in South-Central Montana is reviewed with a focus on the role of volatiles in locally modifying both the crystallization sequence of the evolving parent magma and the initially precipitated solid assemblages to favour olivine ± chromite. A secondary origin for these two minerals is particularly probable for the olivine-bearing rocks of the Banded series and, at a minimum, also increasing their modal abundance in the Peridotite zone of the Ultramafic series. Direct evidence for volatiles includes the presence of high-temperature fluid inclusi

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Holloway, John R., and Sigurdur Jakobsson. "Volatile solubilities in magmas: Transport of volatiles from mantles to planet surfaces." Journal of Geophysical Research: Solid Earth 91, B4 (1986): 505–8. http://dx.doi.org/10.1029/jb091ib04p0d505.

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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 (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 trac

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Madon, Baptiste, Lucie Mathieu, and Jeffrey H. Marsh. "Oxygen Fugacity and Volatile Content of Syntectonic Magmatism in the Neoarchean Abitibi Greenstone Belt, Superior Province, Canada." Minerals 10, no. 11 (2020): 966. http://dx.doi.org/10.3390/min10110966.

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Neoarchean syntectonic intrusions from the Chibougamau area, northeastern Abitibi Subprovince (greenstone belt), may be genetically related to intrusion related gold mineralization. These magmatic-hydrothermal systems share common features with orogenic gold deposits, such as spatial and temporal association with syntectonic magmatism. Genetic association with magmatism, however, remains controversial for many greenstone belt hosted Au deposits. To precisely identify the link between syntectonic magmas and gold mineralization in the Abitibi Subprovince, major and trace-element compositions of

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12

Martin, Audrey M., Etienne Médard, Kevin Righter, and Antonio Lanzirotti. "Intraplate mantle oxidation by volatile-rich silicic magmas." Lithos 292-293 (November 2017): 320–33. http://dx.doi.org/10.1016/j.lithos.2017.09.002.

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Treloar, Peter J., and Howard Colley. "Variations in F and Cl contents in apatites from magnetite—apatite ores in northern chile, and their ore-genetic implications." Mineralogical Magazine 60, no. 399 (1996): 285–301. http://dx.doi.org/10.1180/minmag.1996.060.399.04.

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AbstractMagnetite—apatite deposits associated with the Atacama Fault Zone of northern Chile are interpreted here, on field criteria, as being the products either of hydrothermal fluids with a strong magmatic signature, or of late-stage Fe-rich magmas mixed with an aqueous fluid. Even in the Chilean iron belt, apatite-rich magnetite deposits are a rarity. Variations in F- and Cl- contents in apatites, strongly zoned with respect to halogens, are indicative of primary variations in fHF and fHCI in the hydrothermal fluids. Small variations in halogen fugacities in the aqueous fluid are capable of

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Correale, Alessandra, Vittorio Scribano, and Antonio Paonita. "A Volcanological Paradox in a Thin-Section: Large Explosive Eruptions of High-Mg Magmas Explained Through a Vein of Silicate Glass in a Serpentinized Peridotite Xenolith (Hyblean Area, Sicily)." Geosciences 9, no. 4 (2019): 150. http://dx.doi.org/10.3390/geosciences9040150.

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Ultramafic magmas (MgO ≥ 18 wt%) are generally thought to be primary mantle melts formed at temperatures in excess of 1600 °C. Volatile contents are expected to be low, and accordingly, high-Mg magmas generally do not yield large explosive eruptions. However, there are important exceptions to low explosivity that require an explanation. Here we show that hydrous (hence, potentially explosive) ultramafic magmas can also form at crustal depths at temperatures even lower than 1000 °C. Such a conclusion arose from the study of a silicate glass vein, ~1 mm in thickness, cross-cutting a mantle-deriv

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WYLLIE, PETER J., and IGOR D. RYABCHIKOV. "Volatile Components, Magmas, and Critical Fluids in Upwelling Mantle." Journal of Petrology 41, no. 7 (2000): 1195–206. http://dx.doi.org/10.1093/petrology/41.7.1195.

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D'Oriano, Claudia, Chiara Montagna, Simone Colucci, et al. "Fe-rich filamentary textures reveal timescales of magmatic interaction before the onset of high-energy explosive events at basaltic volcanoes." Volcanica 8, no. 1 (2025): 159–74. https://doi.org/10.30909/vol/wytv2139.

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Fe-rich filamentary textures are almost ubiquitous in products from explosive eruptions at basaltic volcanoes and, in particular, they characterize the groundmass of ash and lapilli emitted during high-energy events. Here, we present a multidisciplinary study integrating petrological analyses with computational fluid dynamics simulations to propose a new mechanism responsible for their formation. Detailed textural and compositional features of Fe-rich filaments were examined in the products of explosive eruptions with different intensities from Stromboli and Etna (Italy) volcanoes. Results rev

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17

Yao, Zhuosen, James E. Mungall, and Kezhang Qin. "A Preliminary Model for the Migration of Sulfide Droplets in a Magmatic Conduit and the Significance of Volatiles." Journal of Petrology 60, no. 12 (2019): 2281–316. http://dx.doi.org/10.1093/petrology/egaa005.

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Abstract A close relationship between Ni–Cu–(PGE) sulfide deposits and magmatic conduit systems has been widely accepted, but our present understanding still rests on empirical inductions that sulfide liquids are entrained during magma ascent and aggregated at hydrodynamic traps such as the opening of a conduit into a larger magma body. In this contribution, a preliminary quantitative model for the dynamics of mm-scale sulfide droplets in a vertical magmatic conduit is developed, examining such limiting parameters as the size, transport velocity and the magmas’ maximum carrying capacity for su

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Słaby, E., K. Gros, H. J. Förster, et al. "Mineral–fluid interactions in the late Archean Closepet granite batholith, Dharwar Craton, southern India." Geological Society, London, Special Publications 489, no. 1 (2019): 293–314. http://dx.doi.org/10.1144/sp489-2019-287.

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AbstractThe chemical composition of different rocks as well as volatile-bearing and volatile-free minerals has been used to assess the presence of fluids in the Closepet batholith and to estimate the intensity of the fluid–rock interactions. The data were processed using polytopic vector analysis (PVA). Additional data include measurements of water content in the structure of volatile-free minerals and an examination of growth textures. The composition of mineral domains indicated formation/transformation processes with common fluid–mineral interactions. In general, the results suggested that

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LENSKY, N. G., V. LYAKHOVSKY, and O. NAVON. "Expansion dynamics of volatile-supersaturated liquids and bulk viscosity of bubbly magmas." Journal of Fluid Mechanics 460 (June 10, 2002): 39–56. http://dx.doi.org/10.1017/s0022112002008194.

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We derive expressions for the bulk viscosity of suspension of gas bubbles in an incompressible Newtonian liquid that exsolves volatiles. The suspension is modelled as close packed spherical cells and is represented by a single cell (‘cell model’). A cell, consisting of a gas bubble centred in a spherical shell of a volatile-bearing liquid, is subjected to decompression that is applied at the cell boundary, and the resulting dilatational boundary motion and driving pressure are obtained. The dilatational motion and the driving pressure are used to define the bulk viscosity of the cell, as if it

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Wade, Jennifer A., Terry Plank, William G. Melson, Gerardo J. Soto, and Erik H. Hauri. "The volatile content of magmas from Arenal volcano, Costa Rica." Journal of Volcanology and Geothermal Research 157, no. 1-3 (2006): 94–120. http://dx.doi.org/10.1016/j.jvolgeores.2006.03.045.

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Lucic, Gregor, Anne-Sophie Berg, and John Stix. "Water-rich and volatile-undersaturated magmas at Hekla volcano, Iceland." Geochemistry, Geophysics, Geosystems 17, no. 8 (2016): 3111–30. http://dx.doi.org/10.1002/2016gc006336.

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Cicconi, Maria Rita, Charles Le Losq, Roberto Moretti, and Daniel R. Neuville. "Magmas are the Largest Repositories and Carriers of Earth’s Redox Processes." Elements 16, no. 3 (2020): 173–78. http://dx.doi.org/10.2138/gselements.16.3.173.

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Magma is the most important chemical transport agent throughout our planet. This paper provides an overview of the interplay between magma redox, major element chemistry, and crystal and volatile content, and of the influence of redox on the factors that drive igneous system dynamics. Given the almost infinite combinations of temperature, pressure, and chemical compositions relevant to igneous petrology, we focus on the concepts and methods that redox geochemistry provides to understand magma formation, ascent, evolution and crystallization. Particular attention is paid to the strong and compl

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Belenitskaya, G. A. "On the participation of natural salts in alkaline magmatism. Article 3. Genetic aspects of the model of salt-alkaline interactions." LITHOSPHERE (Russia) 21, no. 2 (2021): 172–97. http://dx.doi.org/10.24930/1681-9004-2021-21-2-172-197.

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Research subject. An analysis of regional and global geological material characterizing the spatio-temporal relationships between alkaline magmatic and saline complexes allowed the author to propose and justify a new geological-genetic model of alkaline magmatism. This model considers saline complexes, located along the paths of the upward movement of deep magmas, as additional sources of alkaline and volatile components.Materials and methods. Three articles are devoted to the discussion and justification of this model. Two articles were devoted to geological aspects of the problem. The prereq

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Witt, Walter, Malcolm Roberts, Steffen Hagemann, and Chris Fisher. "Apatite and Biotite in Syenitic Intrusions, Archean Karari Gold Deposit: Evidence for an Oxidized Magma and Oxidized Subsolidus Potassic (Biotite) Alteration." Canadian Journal of Mineralogy and Petrology 61, no. 2 (2023): 217–38. http://dx.doi.org/10.3749/2200043.

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Abstract Apatite and biotite from syenitic intrusions at the Karari gold deposit, Kurnalpi Terrane, Archean Yilgarn Craton, Western Australia, were targeted for microprobe and LA-ICP-MS analyses in order to determine some parameters (e.g., temperature, oxygen fugacity) during magmatic crystallization and potassic (biotite) hydrothermal alteration. The understanding of magmatic conditions is limited by the almost complete hydrothermal modification of magmatic minerals but made possible by the analysis of refractory magmatic apatite and rare relics of Ba-rich biotite. The SO3 contents of apatite

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Edmonds, Marie, Emily Mason, and Olivia Hogg. "Volcanic Outgassing of Volatile Trace Metals." Annual Review of Earth and Planetary Sciences 50, no. 1 (2022): 79–98. http://dx.doi.org/10.1146/annurev-earth-070921-062047.

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Volcanoes play a key role in the cycling of volatile metals (e.g., chalcophile elements such as Tl, Pb, and Cu and metalloids such as As, Te, and Se) on our planet. Volatile metals and metalloids are outgassed by active volcanoes, forming particulate volcanic plumes that deliver them in reactive form to the environment, where they may be nutrients (e.g., Cu and Zn) or pollutants (e.g., Hg, As, Pb). Volcanic outgassing rates of these elements compare to those associated with building ore deposits in the crust and to anthropogenic emission rates. There are distinct compositional differences betw

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Zajacz, Zoltán, Jung Hun Seo, Philip A. Candela, Philip M. Piccoli, Christoph A. Heinrich, and Marcel Guillong. "Alkali metals control the release of gold from volatile-rich magmas." Earth and Planetary Science Letters 297, no. 1-2 (2010): 50–56. http://dx.doi.org/10.1016/j.epsl.2010.06.002.

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Broska, Igor, and Michal Kubiš. "Accessory minerals and evolution of tin-bearing S-type granites in the western segment of the Gemeric Unit (Western Carpathians)." Geologica Carpathica 69, no. 5 (2018): 483–97. http://dx.doi.org/10.1515/geoca-2018-0028.

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Abstract The S-type accessory mineral assemblage of zircon, monazite-(Ce), fluorapatite and tourmaline in the cupolas of Permian granites of the Gemeric Unit underwent compositional changes and increased variability and volume due to intensive volatile flux. The extended S-type accessory mineral assemblage in the apical parts of the granite resulted in the formation of rare-metal granites from in-situ differentiation and includes abundant tourmaline, zircon, fluorapatite, monazite-(Ce), Nb–Ta–W minerals (Nb–Ta rutile, ferrocolumbite, manganocolumbite, ixiolite, Nb–Ta ferberite, hübnerite), cas

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Shi, Sarah, William Henry Towbin, Terry Plank, et al. "PyIRoGlass: An open-source, Bayesian MCMC algorithm for fitting baselines to FTIR spectra of basaltic-andesitic glasses." Volcanica 7, no. 2 (2024): 471–501. http://dx.doi.org/10.30909/vol.07.02.471501.

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Quantifying volatile concentrations in magmas is critical for understanding magma storage, phase equilibria, and eruption processes. We present PyIRoGlass, an open-source Python package for quantifying concentrations of H2O and CO2 species in the transmission FTIR spectra of basaltic to andesitic glasses. We leverage a dataset of natural melt inclusions and back-arc basin basalts with volatiles below detection to delineate the fundamental shape and variability of the baseline underlying the CO32- and H2Om, 1635 peaks, in the mid-infrared region. All Beer-Lambert Law parameters are examined to

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Holtz, F., B. Scaillet, H. Behrens, F. Schulze, and M. Pichavant. "Water contents of felsic melts: application to the rheological properties of granitic magmas." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 87, no. 1-2 (1996): 57–64. http://dx.doi.org/10.1017/s0263593300006477.

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ABSTRACT:New experimental determinations of water solubility in haplogranitic melts (anhydrous compositions in the system Qz-Ab-Or and binary joins) and of the viscosity of hydrous Qz28Ab38Or34 melts (normative proportions) and natural peraluminous leucogranitic melt (Gangotri, High Himalaya) are used to constrain the evolution of viscosity of ascending magmas, depending on their P-T paths.At constant pressure, in the case of fluid-absent melting conditions, with water as the main volatile dissolved in the melts, the viscosity of melts generated from quartzo-feldspathic protoliths is lower at

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Naumov, V. B., A. V. Girnis, and V. A. Dorofeeva. "Major, volatile, ore, and trace elements in magmatic melts from main geodynamic settings. II. Similarity and differences." Геохимия 69, no. 1 (2024): 21–35. http://dx.doi.org/10.31857/s0016752524010026.

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Based on the mean contents of elements and their standard deviations estimated in the first part of this research project (Naumov et al, 2022), we compared in detail the distinguished geodynamic settings. In order to compare the compositions of mafic melts, a correction to take into account changes related to the fractionation of main minerals was introduced. The use of numerical criteria made it possible to determine the sequence of elements by the degree of coherence during melting and crystallization of the main magmatic melts. Within this sequence, a regular variation in elemental contents

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Brady, A. E., and K. R. Moore. "A mantle-derived dolomite silicocarbonatite from the southwest coast of Ireland." Mineralogical Magazine 76, no. 2 (2012): 357–76. http://dx.doi.org/10.1180/minmag.2012.076.2.06.

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AbstractThe magma source and evolution of a zoned breccia pipe on the southern Beara Peninsula in southwest Ireland are investigated using the geochemistry of the host mineral assemblages. The clast-poor inner zone of the pipe has a magnesium-rich silicocarbonatite whole-rock composition (14.30 wt.% MgO; 31.80 wt.% SiO2). The silicocarbonatite has retained an ultimate mantle source 13C isotopic composition after metamorphism, consistent with the presence of mantle debris. The silicocarbonatite is Cr-, Ni- and Co-rich (847 ppm, 611 ppm and 60 ppm, respectively) but REE depleted compared with vo

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Henderson, C. M. B., F. R. Richardson, and J. M. Charnock. "The Highwood Mountains potassic igneous province, Montana: mineral fractionation trends and magmatic processes revisited." Mineralogical Magazine 76, no. 4 (2012): 1005–51. http://dx.doi.org/10.1180/minmag.2012.076.4.16.

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AbstractPotassium-rich mafic dykes and lavas from the Highwood Mountains Igneous Province, USA were studied by electron-microprobe and bulk-rock analysis. For the mafic phonolites, compositional trends for olivine and augite phenocrysts and groundmass biotite, alkali feldspar and titanomagnetites are presented and substitution mechanisms discussed. Phenocrysts of biotite and augite in the minettes are also characterized, together with groundmass alkali feldspar and titanomagnetite. The alkali feldspars and biotites are commonly enriched in Ba. Olivine, clinopyroxene and biotite phenocrysts are

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Sutcliffe, R. H., J. M. Sweeny, and A. D. Edgar. "The Lac des Iles Complex, Ontario: petrology and platinum-group-elements mineralization in an Archean mafic intrusion." Canadian Journal of Earth Sciences 26, no. 7 (1989): 1408–27. http://dx.doi.org/10.1139/e89-120.

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The Lac des Iles Complex is a late Archean, mafic to ultramafic complex that is host to 20.4 × 106 t Pt, Pd, and Au mineralization with an average grade of 6.34 g/t platinum-group elements (PGE). The 30 km2 complex, located in the Wabigoon Subprovince, consists of several coalescing mafic to ultramafic intrusive centers. The complex is emplaced into early gneissic tonalite and is contemporaneous with late granitoids.The magmatic evolution of the complex reflects the emplacement of multiple pulses of previously fractionated magma, some of which underwent subsequent in situ fractionation. Distin

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Metrich, N., and P. J. Wallace. "Volatile Abundances in Basaltic Magmas and Their Degassing Paths Tracked by Melt Inclusions." Reviews in Mineralogy and Geochemistry 69, no. 1 (2008): 363–402. http://dx.doi.org/10.2138/rmg.2008.69.10.

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Sibik, Svetlana, Marie Edmonds, John Maclennan, and Henrik Svensen. "Magmas Erupted during the Main Pulse of Siberian Traps Volcanism were Volatile-poor." Journal of Petrology 56, no. 11 (2015): 2089–116. http://dx.doi.org/10.1093/petrology/egv064.

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Plechov, Pavel, Jon Blundy, Nikolay Nekrylov, Elena Melekhova, Vasily Shcherbakov, and Margarita S. Tikhonova. "Petrology and volatile content of magmas erupted from Tolbachik Volcano, Kamchatka, 2012–13." Journal of Volcanology and Geothermal Research 307 (December 2015): 182–99. http://dx.doi.org/10.1016/j.jvolgeores.2015.08.011.

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Robidoux, P., S. G. Rotolo, A. Aiuppa, G. Lanzo, and E. H. Hauri. "Geochemistry and volatile content of magmas feeding explosive eruptions at Telica volcano (Nicaragua)." Journal of Volcanology and Geothermal Research 341 (July 2017): 131–48. http://dx.doi.org/10.1016/j.jvolgeores.2017.05.007.

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Robidoux, P., A. Aiuppa, S. G. Rotolo, A. L. Rizzo, E. H. Hauri, and M. L. Frezzotti. "Volatile contents of mafic-to-intermediate magmas at San Cristóbal volcano in Nicaragua." Lithos 272-273 (February 2017): 147–63. http://dx.doi.org/10.1016/j.lithos.2016.12.002.

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Kamenetsky, Vadim S., Massimo Pompilio, Nicole Métrich, Alexander V. Sobolev, Dmitry V. Kuzmin, and Rainer Thomas. "Arrival of extremely volatile-rich high-Mg magmas changes explosivity of Mount Etna." Geology 35, no. 3 (2007): 255. http://dx.doi.org/10.1130/g23163a.1.

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Coulson, Ian M., James K. Russell, and Gregory M. Dipple. "Origins of the Zippa Mountain pluton: a Late Triassic, arc-derived, ultrapotassic magma from the Canadian Cordillera." Canadian Journal of Earth Sciences 36, no. 9 (1999): 1415–34. http://dx.doi.org/10.1139/e99-045.

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The Zippa Mountain intrusion is of Late Triassic age and is situated in the Iskut River area of northwest British Columbia. The pluton is elliptical in shape and 3.5 by 5 km in diameter. The pluton intrudes Palaeozoic and Triassic rocks within Stikinia and is compositionally zoned from clinopyroxenite at the pluton margins to a core of syenite. The Zippa Mountain pluton comprises aegirine-augite, potassium feldspar, and minor biotite, hornblende, nepheline, vishnevite, titanian andradite, titanite, and apatite. Based on new field, petrographic, and chemical data this intrusion is shown to be s

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McCubbin, Francis M., and Jessica J. Barnes. "The chlorine-isotopic composition of lunar KREEP from magnesian-suite troctolite 76535." American Mineralogist 105, no. 8 (2020): 1270–74. http://dx.doi.org/10.2138/am-2020-7467.

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Abstract We conducted in situ Cl isotopic measurements of apatite within intercumulus regions and within a holocrystalline olivine-hosted melt inclusion in magnesian-suite troctolite 76535 from Apollo 17. These data were collected to place constraints on the Cl-isotopic composition of the last liquid to crystallize from the lunar magma ocean (i.e., urKREEP, named after its enrichments in incompatible lithophile trace elements like potassium, rare earth elements, and phosphorus). The apatite in the olivine-hosted melt inclusion and within the intercumulus regions of the sample yielded Cl-isotop

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Förster, Michael W., Yannick Bussweiler, Dejan Prelević, et al. "Sediment-Peridotite Reaction Controls Fore-Arc Metasomatism and Arc Magma Geochemical Signatures." Geosciences 11, no. 9 (2021): 372. http://dx.doi.org/10.3390/geosciences11090372.

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Subduction of oceanic crust buries an average thickness of 300–500 m of sediment that eventually dehydrates or partially melts. Progressive release of fluid/melt metasomatizes the fore-arc mantle, forming serpentinite at low temperatures and phlogopite-bearing pyroxenite where slab surface reaches 700–900 °C. This is sufficiently high to partially melt subducted sediments before they approach the depths where arc magmas are formed. Here, we present experiments on reactions between melts of subducted sediments and peridotite at 2–6 GPa/750–1100 °C, which correspond to the surface of a subductin

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Coulson, I. M., K. M. Goodenough, N. J. G. Pearce, and M. J. Leng. "Carbonatites and lamprophyres of the Gardar Province – a ‘window’ to the sub-Gardar mantle?" Mineralogical Magazine 67, no. 5 (2003): 855–72. http://dx.doi.org/10.1180/0026461036750148.

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AbstractCarbonatite magmas are considered to be ultimately derived from mantle sources, which may include lithospheric and asthenospheric reservoirs. Isotopic studies of carbonatite magmatism around the globe have typically suggested that more than one source needs to be invoked for generation of the parental melts to carbonatites, often involving the interaction of asthenosphere and lithosphere.In the rift-related, Proterozoic Gardar Igneous Province of SW Greenland, carbonatite occurs as dykes within the Igaliko Nepheline Syenite Complex, as eruptive rocks and diatremes at Qassiarsuk, as a l

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Sokół, Krzysztof, Adrian A. Finch, William Hutchison, Jonathan Cloutier, Anouk M. Borst, and Madeleine C. S. Humphreys. "Quantifying metasomatic high-field-strength and rare-earth element transport from alkaline magmas." Geology 50, no. 3 (2021): 305–10. http://dx.doi.org/10.1130/g49471.1.

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Abstract Alkaline igneous rocks host many global high-field-strength element (HFSE) and rare-earth element (REE) deposits. While HFSEs are commonly assumed to be immobile in hydrothermal systems, transport by late-stage hydrothermal fluids associated with alkaline magmas is reported. However, the magnitude of the flux and the conditions are poorly constrained and yet essential to understanding the formation of REE-HFSE ores. We examined the alteration of country rocks (“fenitization”) accompanying the emplacement of a syenite magma at Illerfissalik in Greenland, through analysis of changes in

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Wang, Zaicong, Huai Cheng, Keqing Zong, et al. "Metasomatized lithospheric mantle for Mesozoic giant gold deposits in the North China craton." Geology 48, no. 2 (2019): 169–73. http://dx.doi.org/10.1130/g46662.1.

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Abstract The origin of giant lode gold deposits of Mesozoic age in the North China craton (NCC) is enigmatic because high-grade metamorphic ancient crust would be highly depleted in gold. Instead, lithospheric mantle beneath the crust is the likely source of the gold, which may have been anomalously enriched by metasomatic processes. However, the role of gold enrichment and metasomatism in the lithospheric mantle remains unclear. Here, we present comprehensive data on gold and platinum group element contents of mantle xenoliths (n = 28) and basalts (n = 47) representing the temporal evolution

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Heinrich, Christoph A. "The Chain of Processes Forming Porphyry Copper Deposits—An Invited Paper." Economic Geology 119, no. 4 (2024): 741–69. http://dx.doi.org/10.5382/econgeo.5069.

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Abstract Porphyry-related mineral deposits are giant geochemical anomalies in the Earth’s crust with orders-of-magnitude differences in the content and proportion of the three main ore metals Cu, Au, and Mo. Deposit formation a few kilometers below surface is the product of a chain of geologic processes operating at different scales in space and time. This paper explores each process in this chain with regard to optimizing the chances of forming these rare anomalies. On the lithosphere scale, deposits with distinct metal ratios occur in provinces that formed during brief times of change in pla

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Moore, K. R., A. E. Brady, and A. Costanzo. "Crystal-liquid segregation in silicocarbonatite magma leads to the formation of calcite carbonatite." Journal of Petrology, June 21, 2022. http://dx.doi.org/10.1093/petrology/egac056.

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Abstract A suite of silicocarbonatite and lamprophyre rocks from SW Ireland, with mantle affinity and primitive composition, are used as a proxy for parental carbonated silicate magmas to model early magmatic evolution. Reconstruction of volatile ratios is validated using global occurrences. At 1200 °C, the point at which melts transition from ionic liquids with exceptionally low viscosity (0.06 PaS) to covalently polymerised liquid (viscosity up to 1.3 PaS) is 33 mol% SiO2. Incremental and significant increase in magma density accompanies magma ponding, due to dehydration of magmas from model

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Gruzdeva, Yulia, Philipp Weis, and Christine Andersen. "Timing of Volatile Degassing From Hydrous Upper‐Crustal Magma Reservoirs With Implications for Porphyry Copper Deposits." Journal of Geophysical Research: Solid Earth 129, no. 7 (2024). http://dx.doi.org/10.1029/2023jb028433.

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AbstractThe timing and duration of volatile generation from crystallizing magma reservoirs and fluid release across the magmatic‐hydrothermal interface depend on complex coupled interactions controlled by non‐linear, dynamic properties of magmas, rocks and fluids. Understanding these mechanisms is essential to explain the rare formation of economic porphyry copper deposits. For this study, we further developed a coupled numerical model that can simultaneously resolve magma and hydrothermal flow by introducing a description of fluid transport within the magma reservoir and volatile release to t

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Wang, Rui, Chenhao Luo, Yingcai Sun, et al. "Formation of giant copper deposits driven by rapid uplift and sudden depressurization." American Mineralogist, November 8, 2024. http://dx.doi.org/10.2138/am-2024-9425.

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Abstract Porphyry Cu deposits (PCDs) in collisional orogens are new targets for modern mineral exploration. A series of post-collisional (Miocene; 22-12Ma) porphyry copper deposit (PCDs) with Cu reserve over 45 Mt have been discovered in the Gangdese magmatic belt, southern Tibet. These magmas derived from partial melting of sulfide-bearing Tibetan juvenile lower crust are fertile for porphyry Cu in many aspects, such as high oxidation state, and rich volatiles such as water, S, and Cl, but some of individual plutons ended up with economic concentrations. The fundamental question remains what

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Li, Qiang, Xiang Sun, Jun Deng, et al. "Reconstructing volatile evolution in melts using zircon-hosted apatite inclusions: Implications for use of apatite as a fertility indicator." American Mineralogist, January 22, 2025. https://doi.org/10.2138/am-2024-9561.

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Abstract Porphyry Cu deposits are genetically associated with oxidized, hydrous, and volatile-rich (e.g., Cl, S) magmas. Magmatic volatiles are critical to the fertility of magmas associated with porphyry Cu mineralization. A continuous volatile record from volatile-undersaturation to fluid-saturation in the magma reservoir is significant for understanding the genesis of porphyry Cu deposits. Apatite serves as a reliable recorder of the magmatic-hydrothermal history in porphyry Cu systems, with its volatile evolution providing an effective method for identifying the occurrence of volatile satu

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