 | Masotta, M., Mollo, S., Nazzari, M., Tecchiato, V., Scarlato, P., Papale, P., Bachmann, O. (2018) Crystallization and partial melting of rhyolite and felsite rocks at Krafla volcano: A comparative approach based on mineral and glass chemistry of natural and experimental products. Chemical Geology, 483. 603-618 doi:10.1016/j.chemgeo.2018.03.031 | Journal (article/letter/editorial) | | partial melting of rhyolite and felsite rocks at Krafla volcano: A comparative approach based on mineral and...partial melting of rhyolite and felsite rocks at Krafla volcano: A comparative approach based on mineral and...partial melting of rhyolite and felsite rocks at Krafla volcano: A comparative approach based on mineral and...cuttings were collected at Krafla volcano during the perforation of the Iceland Deep Drilling Project Well...quartzofeldspathic rocks. Felsite lenses from the Krafla substrate may explore variable degrees of remelting |  | Castro, J. M., Beck, P., Tuffen, H., Nichols, A. R.L., Dingwell, D. B., Martin, M. C. (2008) Timescales of spherulite crystallization in obsidian inferred from water concentration profiles. American Mineralogist, 93 (11) 1816-1822 doi:10.2138/am.2008.2904 | Journal (article/letter/editorial) | | of spherulite growth in obsidians from Krafla volcano, Iceland. We measured water concentration profiles...paragenesis (plagioclase + SiO2 + clinopyroxene + magnetite). This pattern is controlled by a balance between...the Hrafntinnuhryggur ridge system on Krafla volcano, Iceland. These obsidians come from a small (~5...(2) sample magnetism to identify Fe-oxides as magnetite; and (3) compositional data from energy dispersive...mineralogy. The glass transition temperature of the Krafla obsidian was determined by differential scanning |  | Escobedo, David, Patrier, Patricia, Beaufort, Daniel, Gibert, Benoit, Levy, Léa, Findling, Nathaniel, Mortensen, Annette (2021) Contribution of the Paragenetic Sequence of Clay Minerals to Re-Examination of the Alteration Zoning in the Krafla Geothermal System. Minerals, 11 (9) 935 doi:10.3390/min11090935 | Journal (article/letter/editorial) | | Re-Examination of the Alteration Zoning in the Krafla Geothermal System David Escobedo 1,2 , Patricia...Re-Examination of the Alteration Zoning in the Krafla Geothermal System. Minerals 2021, 11, 935. https://doi...beaufort@univ-poitiers.fr ÍSOR—Iceland GeoSurvey, Grensásvegur 9, 108 Reykjavík, Iceland; lea.levy@geo.au.dk Institute...Landsvirkjun Power, Háaleitisbraut 68, 103 Reykjavik, Iceland; Anette.Mortensen@landsvirkjun.is Correspondence:...mineralogy of the “smectite” alteration zone in the Krafla geo-thermal field via the study of an exploratory |  | | Journal (article/letter/editorial) | | water-basalt interactions. II: A field study in N.E. Iceland SJGURDURR. GISLASON*and HANsP. ELJGSTER Department...BARNESet al. ( 1978) and NESBI~ and actions. N.E. Iceland provides a unique opportunity BRKKER (1978). In...of Iceland, on the N.E. Iceland groundwater system, the system Dunhagi 3, 107 Reykjavik, Iceland. responsible...responsible for recharge of the Krafla geothermal field. 2841 5 K. Glslason 2842 GEOLOGY The neovolcanic...1974; AND CLIMATE OF THE N.E. ICELAND RIFT ZONE or rift zane of N.E. Iceland BJORNSSON ef al., 1977, |  | | Journal (article/letter/editorial) | | crystallization, magma mixing, and assimilation. KEY WORDS: Iceland rift zones; cotectic crystallization; pressure;...of magma chambers beneath active volcanoes in Iceland (e.g. Soosalu & Einarsson, 2004; Sturkell et al...2006), and yield results that in many cases (e.g. Krafla, Grimsvo«tn, Katla, possibly Torfajo«kull) agree...oxfordjournals.org/ by guest on March 23, 2015 Iceland lies astride the Mid-Atlantic Ridge and was created...shallow and deep chambers beneath others (e.g. Krafla and Askja). We have compiled analyses of basalt |  | Pleše, P., Higgins, M. D., Baker, D. R., Lanzafame, G., Kudrna Prašek, M., Mancini, L., Rooyakkers, S. M. (2019) Production and detachment of oxide crystal shells on bubble walls during experimental vesiculation of andesitic magmas. Contributions to Mineralogy and Petrology, 174 (3) doi:10.1007/s00410-019-1556-8 | Journal (article/letter/editorial) | | between bubbles and oxide crystals (especially magnetite) is well established and their tendency to remain...oxides in basalt and andesite from Soufrière Hills volcano and revealed single-point bubble–oxide contacts...large bubble with several smaller disconnected magnetite crystals on its surface (Gualda and Anderson 2007)...been produced by processes of bubble growth and magnetite crystallization. Materials and methods Hydrous...nUserG uide. pdf). Two natural samples from Krafla (Iceland) were also scanned by this machine for comparison |  | | Journal (article/letter/editorial) | | Evolution of the Torfajokull Volcanic Complex, Iceland II. The Role of Magma Mixing by D. W. McGARVIE...Sacramento, California 95821 ABSTRACT In southern Iceland, tholeiitic basalt magmas propagating laterally...basic building block of Icelandic volcano-tectonics is the central volcano and fissure swarm unit (Saemundsson...eruptions at Krafla allowed this process to be monitored carefully for the first time in Iceland (Einarsson...one centre are unlikely to intersect the central volcano of an adjoining centre and thus close relationships |  | | Journal (article/letter/editorial) | | rocks and coexisting phenocrysts of the Thingmúli volcano suggest a revision of the existing models for the...formation of intermediate and silicic melts in Iceland. The new data define two compositional tholeiitic...3–5 wt% FeO at c. 1 wt% MgO, which is typical of Iceland but higher than MORB compositions. The most evolved...constrained to one-log unit below the fayalite-magnetite-quartz oxygen buffer (FMQ-1). The LFe trend is...Holocene volcanic systems of spreading rifts (e.g. Krafla), propagating rifts (e.g. Hekla) and off-rifts |  | | Journal (article/letter/editorial) | | temperatures reached in the past. The influence of magnetite and pyrite, two semi-conductors, also has a strong...serpentinization path [8] and favors the production of magnetite [9]. Alteration paths exert a strong control regarding...Figure 1. Sketch of the cross-section of a strato-volcano. Adapted from Stimac et al. [48] and Richards [49]...(modified from Revil et al. [52]). Core samples with magnetite usually found near the ground surface in volcanoes...Alteration trend with the equilibrium temperature in Iceland for the secondary minerals (modified from Kousehlar |  | | Journal (article/letter/editorial) | | Association, 103, 303-320. The importance of reliable volcano monitoring is illustrated by the number of deaths...deformation continues to form the mainstay of most volcano surveillance programmes, but this work is now increasingly...means to establish and maintain even rudimentary volcano surveillance programmes which could warn of impending...order to establish whether or not a particular volcano is demonstrating anomalous behaviour which might...recognized and understood. A primary role for any volcano monitoring programme is, therefore , to establish |  | | Report (chapter) | | a function of the pressure in the magma storage region, the physical properties of the magma, such as...volcanoes there is good evidence for a magma storage region in the crust, a magma reservoir from which the...for basaltic volcanic centers such as Hawaii, Iceland, Etna, and the Canary Islands (Decker 1987; Klugel...seismic evidence generally indicates a magma storage region in the crust or near the crustmantle boundary....the mantle without encountering a crustal storage region. In such cases, Magma Ascent Rates 243 west |  | | Report (chapter) | | Institute of Earth Sciences, University of Iceland, Iceland 2 Division of Applied Geophysics, Department...extending north of the Álftafjörður central volcano in east Iceland are studied to test models of dyke swarm...and northwards directed away from the central volcano for nine dykes, and found to be vertical in three...extensional geodynamic environments, such as in Iceland, is complicated by interactions between magmatism...Geoffroy et al. 2002; Aubourg et al. 2008). In Iceland, such studies have been few. Apart from the early |  | | Journal (article/letter/editorial) | | reported from spherulites in obsidian at the Krafla Volcano, Iceland (Castro et al. 2008). Quartz spherulites...and interstitial to feldspar fibrils. Accessory magnetite is sometimes present. Despite the name, spherulites...way include euhedral tridymite, fayalite, and magnetite. This process is also responsible for the beautiful |  | | Journal (article/letter/editorial) | | of CO 2 and CO to approximately the fayalite-magnetite-quartz buffer. Melting temperatures were varied...samples: GR2 - Snaefellsnes (Thy 1983) KRAI Krafla volcano (K Gr6nvold, pers comm) HS605 Langj6kull (Sigurdsson...common base. Because the components ilmenite, magnetite, apatite, and orthoclase are excluded from the...systems. This becomes particularly apparent for magnetite and ilmenite saturated liquids (Thy et al. 1991)...significantly less calcic. Tholeiitic liquids (Krafla, Table 1; Grove and Bryan 1983) coexist with augites |  | | Journal (article/letter/editorial) | | chamber processes in central volcanic systems of Iceland: constraints from layered gabbro of the Austurhorn...investigations of the largest gabbro outcrop in Iceland, the Hvalnesfjall gabbro of the 6–7 Ma Austurhorn...spikes in Mg# and Cr2O3 of clinopyroxene and magnetite indicative of magma replenishment. Some macrorhythmic...similar to known transitional olivine basalts from Iceland that had undergone about 20% crystallisation of...magma chambers over the Iceland mantle plume. The Austurhorn central volcano likely formed in an off-rift |  | | Journal (article/letter/editorial) | | storage and recycling of crystal mush at Krafla Volcano, Iceland Kari M. Cooper1 · Kenneth W. W. Sims2 ·...populations, from basalts erupted at Krafla Volcanic Center, Iceland. These data document the presence of...crystallized material at all crustal levels. Keywords Iceland · Crystal mush · Uranium-series disequilibria ·...spectrum of erupted compositions from a given volcano. Evidence for such complex interactions between...1987; Helz 1987; Wright 1973), and Iceland. In the case of Iceland, recent work has documented abundant |  | Costa, S., Masotta, M., Gioncada, A., Pistolesi, M., Bosch, D., Scarlato, P. (2020) Magma evolution at La Fossa volcano (Vulcano Island, Italy) in the last 1000 years: evidence from eruptive products and temperature gradient experiments. Contributions to Mineralogy and Petrology, 175 (4) doi:10.1007/s00410-020-1669-0 | Journal (article/letter/editorial) | | 175:31 ORIGINAL PAPER Magma evolution at La Fossa volcano (Vulcano Island, Italy) in the last 1000 years:...volcanic activity of the last 1000 years at La Fossa volcano (Vulcano Island, Italy) was characterized by the...inferred for the shallow plumbing system of La Fossa volcano (150 MPa and 1050–900 °C), indicate different paths...fact, common in the recent activity of La Fossa volcano (e.g. Piochi et al. 2009; Rossi et al. 2019). Significant...K2O of the entire eruptive history of La Fossa volcano (up to 7.5 wt.%; Fulignati et al. 2018). The petrological |  | | Journal (article/letter/editorial) | | Earth Science Institute, University of Iceland, 101 Reykjavik, Iceland Geological and Planetary Sciences,...Abstract The 1783–1784 AD fissure eruption of Laki (Iceland) produced 15 km3 of homogeneous basaltic lavas...as in November 2004 from the Grímsvötn central volcano, which together with Laki are a part of a single...magma from the Laki–Grímsvötn volcanic system in Iceland (Fig. 1). The 1783–1784 eruption of Laki was the...icelandite on the northern flank of Grímsvötn central volcano [12,13]. This paper has been motivated by the discovery |  | | Journal (article/letter/editorial) | | et al., 1988 Oversby, 1972 Indian Ocean Basin Krafla Vol. Surtsey Widom et al., 1992 Oskarsson et al...Verde F. Noronhodi Tristan da Cunha Azores Is. Iceland Dickey et al., 1977 H u m p h r i s et al., 1985...depleted-MORBmantle basalts of Iceland, like rocks from the Krafla volcano averaging 11.7 ppm Ce, are in...trations than those for MORB (Fig. 3B). Mauna Kea volcano on the island of Hawaii, the Pitcairn Islands,...Honolulu series on the island of Oahu and the Koloa volcano series on the island of Kauai, have more scattered |  | | Report (issue) | | Richard A. Houghton (Eds.) 154 The Rocky Mountain Region—An Evolving Lithosphere: Tectonics, Geochemistry...(Eds.) 172 Volcanism and Subduction: The Kamchatka Region John Eichelberger, Evgenii Gordeev, Minoru Kasahara... and Roderick Heelis (Eds.) 182 The Stromboli Volcano: An Integrated Study of the 2002–2003 Eruption..........................67 Implications of the Iceland Deep Drilling Project for Improving Understanding...on faster spreading ridges. Taking advantage of Iceland as the part of the Mid-Atlantic Ridge most accessible |  | | Journal (article/letter/editorial) | | Myggbukta Complex is a shallowly dissected central volcano superimposed on the early Tertiary Plateau Basalts...succession (UPLS). It is proposed that a large shield volcano developed some 100 km west of the developing spreading...East Greenland in the Gauss Halvo-Hold with Hope region (fig. 1, Upton et al,, 1980) where initial volcanism...latter is the dissected remains of a large central volcano; while the extrusive and hypabyssal rocks which...basalt to rhyolite, it was dominantly a basaltic volcano with intermediate and acid compositions playing |  | | Book (volume) | | NORTH ATLANTIC REGION The Geology of North America The Western North Atlantic Region . Frontispiece...North America Volume M The Western North Atlantic Region Edited by Peter R. Vogt Naval Research Laboratory...be photocopied purpose of scientific Atlantic region. and included for the noncommercial or educational...Atlantic Kristjan 6. and tectonics Macdonald in Iceland, and application submarine mid-ocean ridges Gudmundur...delimiting the geographic scope of a synthesis volume. Iceland has often been used as a boundary, but from the |  | Dostal, Jaroslav, Hamilton, Tark S., Shellnutt, J. Gregory (2017) Generation of felsic rocks of bimodal volcanic suites from thinned and rifted continental margins: Geochemical and Nd, Sr, Pb-isotopic evidence from Haida Gwaii, British Columbia, Canada. Lithos, 292. 146-160 doi:10.1016/j.lithos.2017.09.005 | Journal (article/letter/editorial) | | often mineralized with finely disseminated pyrite. Volcano-marine equivalents include the felsic breccias...results indicate a relatively uniform juvenile source region for Mesozoic and younger igneous rocks of the Wrangellia...allochthonous terrane including its mantle AC CE P source region is predominantly an isotopically juvenile oceanic...geothermal well while drilling at the Krafla volcano, Iceland. Geology 39, 231-234. 32 ACCEPTED MANUSCRIPT...basalts and rhyolites at Austurhorn, southeastern Iceland: the role of fractional crystallization. Journal |  | | Journal (article/letter/editorial) | | meta-dolerite). Biotite and Fe-oxide (ilmenite or titano-magnetite) nucleus or rounded relict clasts. Type III corona...impurities Different types of Fe-Oxide (magnetite, titano-magnetite, ilmenite, in these microlites and in...vein show enrichment in MgO and Na2O, Table 7). Magnetite microlites comprise mostly FeOt whereas ilmenite...CHATTOPADHYAY intermediate composition of ilmenite and magnetite is represented by different composition – all...all suggest a melt origin of these titano-magnetite in which TiO2 percentage is lower and FeOt is rela- |  | | Journal (article/letter/editorial) | | eastern northward spreading segment and a western northeastern spreading segment. By comparison to other ridge...magmatic plumbing system is characteristic of Iceland today (e.g. Sigurdsson and Sparks 1978; Einarsson...clinopyroxene (CPX), orthopyroxene (OPX), and magnetite (MT) are marked by arrows. Scale bars = 1 cm ...low N a 2 0 contents of basaltic magmas in this region (Melson and O'Hearn 1979). Given a mantle of homogeneous...An excessive degree of melting in the Site 334 region is consistent with the proximity Fig. 13. Order |
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