 | Duffield, W.A., Bullen, T.D., Clynne, M.A., Fournier, R.O., Janik, C.J., Lanphere, M.A., Lowenstern, Jacob, Smith, James G., Giorgis, L.W., Kahsai, Gabreab, Mariam, K.W., Tesfai, Theoderos (1997) Geothermal potential of the Alid Volcanic Center, Danakil Depression, Eritrea. Open-File Report Vol. 1997 (97-291) US Geological Survey doi:10.3133/ofr97291 | Report (issue) | | GEOTHERMAL POTENTIAL OF THE ALID VOLCANIC CENTER, DANAKIL DEPRESSION, ERITREA By: Wendell A. Duffield1 Thomas...Ministry of Energy, Mines and Water Resources, Eritrea Open-File Report 97-291 This report is preliminary...the terms of PAS A Number AOT-0002-P-00-5033-00. Alid structural dome as seen from the field camp. View...of the flanks of the mountain in this view are rhyolite lava flows dipping at steep to moderate angles...at and just below the skyline on the right, is rhyolite pumice that was erupted from the summit area after |  | | Journal (article/letter/editorial) | | Comagmatic A-Type Granophyre and Rhyolite from the Alid Volcanic Center, Eritrea, Northeast Africa JACOB B....late-Pleistocene pyroclastic flow ejecta from the Alid volcanic center, northeast Africa, are the rapidly crystallized...and subaerial strata. Eruptions of crystal-poor rhyolite from this shallow magma chamber caused degassing...in the intrusion. The most recent eruption from Alid excavated the crystallized granitic wall of the...granitic bodies, particularly those associated with volcanic rocks (Buddington, 1959; Dunham, 1965). On occasion |  | LOWENSTERN, J. B., CHARLIER, B. L. A., CLYNNE, M. A., WOODEN, J. L. (2006) Extreme U-Th Disequilibrium in Rift-Related Basalts, Rhyolites and Granophyric Granite and the Timescale of Rhyolite Generation, Intrusion and Crystallization at Alid Volcanic Center, Eritrea. Journal of Petrology, 47 (11) 2105-2122 doi:10.1093/petrology/egl038 | Journal (article/letter/editorial) | | Timescale of Rhyolite Generation, Intrusion and Crystallization at Alid Volcanic Center, Eritrea 1 VOLCANO...2006; ADVANCE ACCESS PUBLICATION JULY 14, 2006 Rhyolite pumices and co-erupted granophyric (granite) xenoliths...at 15.2 ± 2.9 ka at the Alid volcanic center in the Danikil Depression, Eritrea. Whole-rock U and Th isotopic...little as 30 000 years. Final crystallization of the Alid granophyre occurred rapidly and at shallow depths...for extraction of basalt from its mantle source region, subsequent crystallization and melt extraction |  | Carley, Tamara L., Miller, Calvin F., Wooden, Joseph L., Bindeman, Ilya N., Barth, Andrew P. (2011) Zircon from historic eruptions in Iceland: reconstructing storage and evolution of silicic magmas. Mineralogy and Petrology, 102 (1) 135-161 doi:10.1007/s00710-011-0169-3 | Journal (article/letter/editorial) | | carley@vanderbilt.edu J. L. Wooden Stanford-USGS Micro Analysis Center, SHRIMP Lab, Stanford University, Green Earth Sciences...U-Th disequilibrium dating has demonstrated that volcanic zircons record several hundred k.y. of pre-eruption... 2010a). We have examined zircon from silicic volcanic rocks from recent (primarily historical) eruptions...(2002): RVB, Reykjanes Volcanic Belt; WVZ, EVZ, NVZ: Northern, Eastern and Western Volcanic Zones; OVB, Oraefi...Oraefi Volcanic Belt; SVB, Snaefellsness Volcanic Belt; MIB, Mid-Icelandic Belt; RR, Reykjanes Ridge; TFZ |  | Carley, Tamara L., Miller, Calvin F., Wooden, Joseph L., Padilla, Abraham J., Schmitt, Axel K., Economos, Rita C., Bindeman, Ilya N., Jordan, Brennan T. (2014) Iceland is not a magmatic analog for the Hadean: Evidence from the zircon record. Earth and Planetary Science Letters, 405. 85-97 doi:10.1016/j.epsl.2014.08.015 | Journal (article/letter/editorial) | | Planetary, and Space Sciences, W.M. Keck Foundation Center for Isotope Geochemistry, 595 Charles Young Drive...Department of Earth Sciences, Akeley-Lawrence Science Center, Room 201, 414 E. Clark Street, Vermillion, SD...analyzed in this study were collected from eight volcanic localities (pumice, lava, near-surface subvolcanics);...electron microscope (SEM) at the Microanalysis Center shared by the US Geological Survey and Stanford...Kerlingarfjöll Volcanic Volcanic Volcanic 1 2 3 Stóra-Laxa Hekla Torfajökull Volcanic Volcanic Volcanic 4 5 |  | | Report (issue) | | Hildreth, Wes, 1997, Primitive magmas at five Cascade volcanic fields: Melts from hot, heterogeneous sub-arc...Volcano and earthquake hazards in the Crater Lake region, Oregon: U.S. Geological Survey Open-File Report...R. L., 1997, Zeolites in the Cascade Range of northern Oregon: Oregon Geology, v. 59, p. 107-122. Bargar...hydrothermal minerals in the Cascade Mountains of northern Oregon: U.S. Geological Survey Open-File Report... 1997, New constraints on source processes of volcanic tremor at Arena! Volcano, Costa Rica, using broadband |  | Stelten, Mark E., Downs, Drew T., Dietterich, Hannah R., Mahood, Gail A., Calvert, Andrew T., Sisson, Thomas W., Zahran, Hani, Shawali, Jamal (2018) Timescales of magmatic differentiation from alkali basalt to trachyte within the Harrat Rahat volcanic field, Kingdom of Saudi Arabia. Contributions to Mineralogy and Petrology, 173 (8) doi:10.1007/s00410-018-1495-9 | Journal (article/letter/editorial) | | alkali basalt to trachyte within the Harrat Rahat volcanic field, Kingdom of Saudi Arabia Mark E. Stelten1...40Ar/39Ar ages, and 36Cl ages for volcanic rocks from the Harrat Rahat volcanic field, Saudi Arabia. These data...94305, USA 3 Saudi Geological Survey, National Center for Earthquakes and Volcanoes, P.O. Box 54141,...Complex spatio-temporal field relations at a given volcanic field, such as alternating compositions of eruptive...Yellowstone, Taupo Volcanic Zone), where the presence of a large volume of low-density rhyolite prevents basalts |  | | Journal (article/letter/editorial) | | The Terminal Stages of Rifting Preserved in the Northern East African Rift System Tyrone O. Rooney PII:...The Terminal Stages of Rifting Preserved in the Northern East African Rift System, LITHOS(2020), https://doi...The Terminal Stages of Rifting Preserved in the Northern East African Rift System Tyrone O. Rooney Dept...Afar Depression is a broad region of subdued topography wherein the Red Sea, Gulf of re Aden, and East...magmatism during the development of the rift in this region, however the surface distribution of magmatism |  | | Journal (article/letter/editorial) | | Keywords: Zircon Changbaishan Volcano Eruption Rhyolite Magma storage time a b s t r a c t The Changbaishan...uranium–thorium dating of zircons from the Changbaishan volcanic rocks. Our data indicate that the rhyolitic magmas...rights reserved. 1. Introduction Huge explosive volcanic eruptions probably present the ultimate natural...’ The Changbaishan Millennium eruption with a Volcanic Explosivity Index (VEI) of 7, is comparable in...and Wark, 2008). On a global scale, magnitude 7 volcanic eruptions may have taken place five times in the |  | | Book | | three major structures of the Earth’s crust: the Red Sea, the Gulf of Aden and the East African Rift. Nearly...discovery—along the axis of the depression—of some active volcanic ranges displaying magmatic and tectonic features...be attempted. Extensive radiometric dating of volcanic rocks, coupled with tectonic, petrological and...internal Afar was almost entirely floored by recent volcanic rocks (less than four million years old) and that...margin showed that the connection between the Red Sea and the Gulf of Aden spreading axes had to be found |  | | Journal (article/letter/editorial) | | measurements in zircon crystals from a Holocene rhyolite (Salton Buttes, California) are utilized to assess...Peak (Nevada). Zircon crystals from Salton Buttes rhyolite show evidence for excess 231Pa with a weighted...this technique to young zircon crystals from a rhyolite with a Holocene eruption age, the first observational...the calculated peaks based upon the 246 amu mass region. Zirconium oxide molecular ion peaks (Fig. 2) were...(Nevada), a rhyolite with ~20 ppm U, which is among the highest bulk rock U abundances for volcanic rocks in |  | | Journal (article/letter/editorial) | | Editor: R.W. Carlson Abstract Rhyolite lavas and xenoliths from the Salton Sea geothermal field (Southern...incipient formation of oceanic crust. Salton Buttes rhyolite lavas contain xenoliths that include granophyres...errors 1σ). The dominant zircon population in the rhyolite lavas yielded U–Th ages between ∼ 18 and 10 ka...typical crustal basement values, thus ruling out rhyolite genesis by melting of continental crust. Moreover...silicic plutons in the subsurface of the Salton Sea geothermal field isotopically exchanged with meteoric |  | | Journal (article/letter/editorial) | | magma-chamber processes 13 46 Page 2 of 26 in volcanic systems (e.g., Claiborne et al. 2006; 2010), to...to evaluate links between coeval volcanic and plutonic systems (e.g., Fohey-Breting et al. 2010; Feilen...East Pacific Rise (EPR) (overlapping spreading center, 9°N). These include the 356 analyses published...plume-influenced ocean island settings were hosted in Iceland rhyolite (Carley et al. 2011, 2014), and trachyte from...Ridge (MAR) 13 13 Southern Africa Ophiolite: volcanic arc type Kimberlite Samples CG10-CY11; CG10-CY3 |  | Huraiová, Monika, Paquette, Jean-Louis, Konečný, Patrik, Gannoun, Abdel-Mouhcine, Hurai, Vratislav (2017) Geochemistry, mineralogy, and zircon U–Pb–Hf isotopes in peraluminous A-type granite xenoliths in Pliocene–Pleistocene basalts of northern Pannonian Basin (Slovakia) Contributions to Mineralogy and Petrology, 172 (8) doi:10.1007/s00410-017-1379-4 | Journal (article/letter/editorial) | | granite xenoliths in Pliocene–Pleistocene basalts of northern Pannonian Basin (Slovakia) Monika Huraiová1 ·...post-orogenic A2-type granites of the Carpatho–Pannonian region, which exhibit geochemical features diagnostic...Vaselli 1995). The south-Slovakian Volcanic Field (SSVF) in the northern promontory of the Pannonian Basin...zircon Fig. 1 Geology of the south-Slovakian Volcanic Field (SSVF) with occurrences of granite xenoliths...1998; Konečný et al. 2002). Localized postMiocene volcanic activity in the Pannonian Basin resulted from |  | | Journal (article/letter/editorial) | | P–T–X conditions a b s t r a c t Young (b 1 Ma) volcanic complexes in the Kenya Rift Valley are used to...viscosities (b 104– 10 6 Pa s) result in rapid growth of volcanic edifices, highly efficient crystal–melt separation...Two groups can broadly be distinguished. In a northern group, comprising the Barrier, Emuruangogolak...beneath Olkaria (and probably Eburru) and fed volcanic fields adjacent to the centres. Beneath the southern...Peralkaline silicic systems will remain in the volcanic stage as long as the basalt input is sufficiently |  | | Journal (article/letter/editorial) | | LA1 4YQ, UK U.S. Geological Survey, 956 National Center, Reston, Virginia 20192, USA ABSTR ACT The composition...REE-enriched melt compositions varying from basalt to rhyolite over the P-T range 7.5 20 kbar and 900 1050ºC...chevkinite from an ash bed of the Cerro Toledo Rhyolite, also in the Jemez Mountains; we analysed 6 points...Chikala (YU 721 283). The analysed mineral is a deep-red anhedral grain, partially surrounded by, and clearly...Becker, 1986) and c/p from the Greater Olkaria Volcanic Complex, Kenya (0.04; Macdonald et al., 2002) |  | | Report (chapter) | | ucdavis.edu Mary r. reid Department of Geology Northern Arizona University Flagstaff, Arizona, 86011,...is isotopic dating. The timescales of many sub-volcanic magmatic processes such as magma transport, differentiation...unravel the most recent crystallization history of volcanic minerals. Summary. The net result is that the...efficient growth entrapment, respectively; the region where growth entrapment is possible is shaded....early on that crystallization of minerals in a volcanic rock could pre-date eruption by a significant |  | | Journal (article/letter/editorial) | | Magma extraction pressures and the architecture of volcanic plumbing systems Guilherme A.R. Gualda a,∗ , Darren...extraction rhyolite-MELTS silicic magmas rhyolite a b s t r a c t The deposits of large volcanic eruptions...eruptions from the Taupo Volcanic Zone (TVZ), New Zealand, which were part of a volcanic flare-up. We compare...Elsevier B.V. All rights reserved. 1. Introduction Volcanic eruptions are the surface manifestation of complex...2015; Wilson and Charlier, 2009). In this context, volcanic eruptions provide snapshots of the shallow crust |  | | Journal (article/letter/editorial) | | Keywords: Zircon U–Th disequilibrium dating Pluton Rhyolite Magma a b s t r a c t Granitoid clasts in pyroclastic...intra-caldera Tarawera volcano of the Okataina Volcanic Centre (OVC), New Zealand, provide an insight...beneath one of the most productive Quaternary rhyolite centers on Earth. SIMS U–Th data for 79 granitoid...ka, a period significantly longer than the known volcanic record at OVC (probably ~550 ka). In contrast...Kaharoa event, and that of the three preceding rhyolite eruptions, occurred mostly during 0–50 ka, reflecting |  | | Journal (article/letter/editorial) | | sample was placed within the assembly so that the center of the capsule would be at the ‘hot spot’ during...Creek rhyolite [13] Taupo[14] Alid volcanics [15] Yellowstone melt incl. [16] Bishop Tuff rhyolite I [9]...[9] Bishop Tuff rhyolite II [9] Lund [17] Fraction [17] Toiyabe [17] Hiko [17] Fish Canyon [17] Vista...of the system. In the case of the Bishop Tuff rhyolite, there is good agreement between the aTiO2 predicted...Volatiles and lithophile elements in Taylor Creek rhyolite: constraints from glass inclusion analysis, Am |  | Lowenstern, J.B, Persing, H.M, Wooden, J.L, Lanphere, M, Donnelly-Nolan, J, Grove, T.L (2000) U–Th dating of single zircons from young granitoid xenoliths: new tools for understanding volcanic processes. Earth and Planetary Science Letters, 183 (1) 291-302 doi:10.1016/s0012-821x(00)00273-9 | Journal (article/letter/editorial) | | granitoid xenoliths: new tools for understanding volcanic processes J.B. Lowenstern a; *, H.M. Persing b...ages, and allow dating of 6 300 ka xenoliths from volcanic eruptions. ß 2000 Elsevier Science B.V. All rights...volcanism produced the 885 þ 40 yr Glass Mountain rhyolite [8,11]. Unaltered granitoid xenoliths occur in...the sampled granitoid intrusions, must underlie a region exceeding 150 km2 . The xenoliths are compositionally...of K-feldspar is present as a phenocryst in any volcanic rocks of MLV. Therefore, the K-feldspar is a late |  | | Journal (article/letter/editorial) | | several sequences of plutonic (subvolcanic) and volcanic rocks, which host iron deposits in the Qorveh... monzonite, diorite, and minor gabbros with a volcanic sequences comprised of rhyolitic rocks. The coeval... REE = 177–209 ppm and La/Yb = 4.2–9 ppm for volcanic La/Yb = 2.6–9 ppm for plutonic samples; samples)...rocks with acidic to intermediate intrusive and volcanic rocks, which are Phanerozoic in age (Alavi, 1994)...1): intrusive rocks, volcanic rocks, and metamorphic rocks. Intrusive and volcanic rocks have a range of |  | | Journal (article/letter/editorial) | | carbon dioxide is the second most common gas in volcanic exhalations (White and Waring 1963; Symonds et...with melt composition along the tholeiitic basalt±rhyolite join (Blank and Brooker 1994; see also Fig. 1)...given in Holloway and Blank (1994) at 1,200 °C. Rhyolite curve from experimental data of Fogel and Rutherford...Rutherford (1990) at 1,150 °C. The solubility of CO2 in rhyolite and tholeiitic basalt are very similar. The CO2...showed that Henry's Law applies for the H2O±CO2±rhyolite system at pressures <1 kbar and magmatic temperatures |  | Vazquez, Jorge A., Velasco, Noel O., Schmitt, Axel K., Bleick, Heather A., Stelten, Mark E. (2014) 238 U– 230 Th dating of chevkinite in high-silica rhyolites from La Primavera and Yellowstone calderas. Chemical Geology, 390. 109-118 doi:10.1016/j.chemgeo.2014.10.020 | Journal (article/letter/editorial) | | geochronology Ion microprobe Yellowstone La Primavera Rhyolite a b s t r a c t Application of 238U–230Th disequilibrium...microphenocrysts from a post-caldera Yellowstone, USA, rhyolite yield a range of ages from ca. 110 ka to 250 ka...and rare earth elements recorded in Yellowstone rhyolite, likely reflecting progressive compositional evolution...calderas (Fig. 1), both of which have protracted volcanic histories that are delimited by K–Ar and 40Ar/39Ar...post-caldera lava flows outlined as gray fields. Sampled rhyolite lavas are plotted in orange. Dashed lines are |  | Hutchison, William, Mather, Tamsin A., Pyle, David M., Boyce, Adrian J., Gleeson, Matthew L.M., Yirgu, Gezahegn, Blundy, Jon D., Ferguson, David J., Vye-Brown, Charlotte, Millar, Ian L., Sims, Kenneth W.W., Finch, Adrian A. (2018) The evolution of magma during continental rifting: New constraints from the isotopic and trace element signatures of silicic magmas from Ethiopian volcanoes. Earth and Planetary Science Letters, 489. 203-218 doi:10.1016/j.epsl.2018.02.027 | Journal (article/letter/editorial) | | incipient sea-floor spreading and has witnessed the eruption of large volumes of silicic volcanic rocks across...across the region over ∼45 Ma. The petrogenesis of these silicic rocks sheds light on the role of magmatism...new trace element and Sr–Nd–O isotopic data for volcanic rocks, glasses and minerals along and across active...of crystal cumulate are stored beneath silicic volcanic systems (>100 km3 ), and estimate that crystal...plate stretching in mature rifts at the onset of sea-floor spreading. We infer that ∼45 Ma of magmatism |
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