 | 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 |
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| 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...Holocene volcanic systems of spreading rifts (e.g. Krafla), propagating rifts (e.g. Hekla) and off-rifts...therefore, should be avoided. Keywords Thingmuli volcano Iceland Rhyolite Basalt Intermediate rocks |
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| 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 |
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| samples: GR2 - Snaefellsnes (Thy 1983) KRAI Krafla volcano (K Gr6nvold, pers comm) HS605 Langj6kull (Sigurdsson...tetrahedra with a common base. Because the components ilmenite, magnetite, apatite, and orthoclase are excluded...becomes particularly apparent for magnetite and ilmenite saturated liquids (Thy et al. 1991). The pyroxenes...significantly less calcic. Tholeiitic liquids (Krafla, Table 1; Grove and Bryan 1983) coexist with augites...to appear as the fourth phase is magnetite or ilmenite. This, in effect, will complicate any simple interpretation |
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| 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...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...off-rift flank zone proximal to the Iceland mantle plume during a major rift relocation. Communicated by |
 | 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...(Appendix 1) is mainly titanomagnetite and/or ilmenite that forms either equant PT phenocrysts or microphenocrysts...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...of the model (An8). 24 ACCEPTED MANUSCRIPT Ilmenite crystallizes as the temperature reaches 860oC |
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| 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...(mi) Rutile (ru) Spinel and mag netite (mt) Ilmenite (il) Apatite (Aa) Zircon (Zr) 1.26 Al Ba ...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, |
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| common meta-dolerite). Biotite and Fe-oxide (ilmenite or titano-magnetite) nucleus or rounded relict...G U R E 3 (a) Photomicrograph of cross-shaped ilmenite microlites within Pt-I matrix (PPL); (b) sheath...types of Fe-Oxide (magnetite, titano-magnetite, ilmenite, in these microlites and in the relict clasts...Magnetite microlites comprise mostly FeOt whereas ilmenite depletion in FeOt, TiO2, and K2O, and no significant...AND CHATTOPADHYAY intermediate composition of ilmenite and magnetite is represented by different composition |
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| 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 |
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| 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 |
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| Guttard studied the rocks of the Auvergne region of central France and recognized many recently...derived from vol- cani vicus, or the seat of a volcano. Desmarest (1771) also worked in the Auvergne and...growth in our knowledge of magmatic rocks of Iceland could be expressed in Hall used a primitive furnace...Sartorius von Waltershausen (1853) also worked in Iceland and he proposed that the different igneous rocks...work (1894-1933) on the igneous rocks of the Oslo region of Norway; (b) the publication in 1895 of Alfred |
 | Wiesmaier, S., Troll, V. R., Carracedo, J. C., Ellam, R. M., Bindeman, I., Wolff, J. A. (2012) Bimodality of Lavas in the Teide-Pico Viejo Succession in Tenerife--the Role of Crustal Melting in the Origin of Recent Phonolites. Journal of Petrology, 53 (12) 2465-2495 doi:10.1093/petrology/egs056 | Journal (article/letter/editorial) |
| 2003) and extend from beneath Teide^Pico Viejo volcano into Teno and Anaga (Carracedo et al., 2007), but...activity at around 3·5 Ma to build the Las Can‹adas volcano (Mart|¤ et al., 1994; Ancochea et al., 1999). This...contributed to the lateral instability of Las Can‹adas volcano (e.g. Mart|¤ et al., 1994, 1997; Troll et al.,...Icod landslide unroofed the central Las Can‹adas volcano (and the underlying rift zone triple-junction)...(Roque del Conde massif) S - RIFT Las Cañadas volcano Rift volcanism Erosional gap Anaga shield Shield |
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| Neogene flood basalts, Reyðarfjörður, Eastern Iceland. Photo © Hervé Bertrand Printed on acid-free paper...Ollier (Australia), and Thorvaldur Thordarson (Iceland). Their constructively critical reviews helped...Bibhas Sen Geological Survey of India, North Eastern Region, Shillong, Meghalaya, India e-mail: bibhas.sen@gmail...Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland e-mail: torvth@hi.is Loÿc Vanderkluysen... East Greenland, Emeishan, Ethiopian, Ferrar, Iceland, Karoo, Paraná, Siberian, and West Greenland) are |
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| 24 Magnetite 7.25 Chromite 7.26 Hematite 7.27 Ilmenite 7.28 Rutile 7.29 Uraninite 7.30 Pyrite 7.31 Pyrrhotite...hidden by a nebular disc of material (diagonal dark region) similar in mass and size to the one that formed...lower side by the 660 km seismic discontinuity. The region between this depth and another prominent discontinuity...capable of moving, albeit very slowly. In this region, heat can be transferred by moving hot low-density...triple junction may be present beneath the Afar region of Ethiopia, with the Red Sea and Gulf of Aden |
 | | Report (issue) |
| rocks Precambrian rocks Tectonics Basin and Range region _______ _______________ Stratigraphic and structural...Igneous rocks Geochronologic studies Pacific coast region Oregon Western United States Washington California...Geologic maps Water-resource investigations Northeastern region Connecticut Delaware Illinois Indiana Maryland...Water-resource investigations Continued Northeastern region Continued Virginia ________________________...___ Wisconsin ________________ Southeastern region ___________ Alabama _______________________ Florida |
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| rocks Precambrian rocks Tectonics Basin and Range region _______ _______________ Stratigraphic and structural...Igneous rocks Geochronologic studies Pacific coast region Oregon Western United States Washington California...Geologic maps Water-resource investigations Northeastern region Connecticut Delaware Illinois Indiana Maryland...Water-resource investigations Continued Northeastern region Continued Virginia ________________________...___ Wisconsin ________________ Southeastern region ___________ Alabama _______________________ Florida |
 | | Book (edition) |
| 24 Magnetite 7.25 Chromite 7.26 Hematite 7.27 Ilmenite 7.28 Rutile 7.29 Uraninite 7.30 Pyrite 7.31 Pyrrhotite...hidden by a nebular disc of material (diagonal dark region) similar in mass and size to the one that formed...lower side by the 660 km seismic discontinuity. The region between this depth and another prominent discontinuity...capable of moving, albeit very slowly. In this region, heat can be transferred by moving hot low-density...triple junction may be present beneath the Afar region of Ethiopia, with the Red Sea and Gulf of Aden |
 | | Book |
| and oxygen fugacity for the coexisting magnetite–ilmenite solid solution pairs which yielded an equilibration...are usually thought to be emplaced from a focal region above a mantle plume (e.g., Halls 1982; Ernst and...Chadwick et al. 2011) and the active Niuafo’ou volcano in a back-arc basin setting behind the Tonga Arc...Vanderkluysen et al. 2011). Dyke orientations in the region between these subswarms are more complicated and...that trend NW across the Saurashtra (Kathiawar) region (Auden 1949). A sparse set of dykes has been mapped |
 | | Book (edition) |
| Typhon is buried under Etna volcano. Whenever the giant stirs, the volcano erupts violently. Eighteenth...Science, New Zealand Stephen R. McNutt Alaska Volcano Observatory and University of Alaska Fairbanks...Hazard from Lahars and Jökulhlaups Synthesis of Volcano Monitoring 973 1121 John B. Murray, Hazel Rymer...McNutt Impacts of Eruptions on Human Health Volcano Warnings Volcanic Crises Management Peter J. Baxter...Related Phreatomagmatic Eruptions Synthesis of Volcano Monitoring 495 1165 Volcanic Lakes Volcanic Materials |
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| black millimetre-sized grains of magnetite and/or ilmenite. Gabbros occur in thick sills, in uplifted sections...which is softer. THIS OBSIDIAN outcrop is in Iceland, an island where acid igneous rocks are rare. ...Trachyte outcrops of trachyte are seen in this volcano on the island of Tenerife. DOME-SHAPED feldspar...margins. and pyroclastic dacite forms much of the volcano at Crater Lake, Oregon, USA. EXTRUSIVE hornblende...country rocks, which surround and lie beneath the volcano. Rounding of the clasts may have occurred in the |
 | | Book |
| environments from ophiolites, contemporary oceanic crust, Iceland, continental rifts, and continental margins. Professor...open your eyes to the largest and most unexplored region on Earth – the global Mid-Ocean Ridge. My own introduction...ridges: fire and ice 4.2.1 Grimsey Field, north of Iceland 4.2.2 Trollveggen (Troll Wall) Field, Mohns Ridge...colonization 4.11.5 Wiring an active submarine volcano 4.12 Guaymas Basin: venting at sedimented ridges...historically difficult to image. In places such as Iceland, however, where volcanism has been ongoing for |
 | | Report (issue) |
| recorded history only by the 1815 eruption of Tambora Volcano (Indonesia). When this voluminous eruption occurred...was only about 50,000, living in a vast, remote region that was terra incognita to most of the world....ashfalls—reported from places distant from the volcano. The full story of the eruption and what actually...it fortunately occurred in a sparsely populated region, causing only a single fatality (not directly eruption...exponential increase in air traffic in the North Pacific region during recent decades, greater potential hazards |
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| number 452. COVER Summit eruptive vent of Kīlauea Volcano and the southwest flank of Mauna Loa, as seen from...on the right side of the image is the Hawaiian Volcano Observatory and the Jaggar Museum. USGS photograph...his vivid written accounts of the Grand Canyon region, and his observations of the volcanoes, land, and... the USGS took over operation of the Hawaiian Volcano Observatory (HVO), renewing its commitment to the...in 1912 at the edge of the caldera of Kīlauea Volcano, HVO was the vision of Thomas A. Jaggar, Jr., a |
 | | Report (issue) |
| number 452. COVER Summit eruptive vent of Kīlauea Volcano and the southwest flank of Mauna Loa, as seen from...on the right side of the image is the Hawaiian Volcano Observatory and the Jaggar Museum. USGS photograph...his vivid written accounts of the Grand Canyon region, and his observations of the volcanoes, land, and... the USGS took over operation of the Hawaiian Volcano Observatory (HVO), renewing its commitment to the...in 1912 at the edge of the caldera of Kīlauea Volcano, HVO was the vision of Thomas A. Jaggar, Jr., a |
 | | Report (issue) |
| number 452. COVER Summit eruptive vent of Kīlauea Volcano and the southwest flank of Mauna Loa, as seen from...on the right side of the image is the Hawaiian Volcano Observatory and the Jaggar Museum. USGS photograph...his vivid written accounts of the Grand Canyon region, and his observations of the volcanoes, land, and... the USGS took over operation of the Hawaiian Volcano Observatory (HVO), renewing its commitment to the...in 1912 at the edge of the caldera of Kīlauea Volcano, HVO was the vision of Thomas A. Jaggar, Jr., a |
