 | | Journal (article/letter/editorial) | | Observations of the Ion Pile-up in Comets Hale–Bopp and Hyakutake Antonin H. Bouchez and Michael E....High resolution long-slit spectra of Comet Hale–Bopp (C/1995 O1) were obtained with the Hamilton Echelle...standoff distance and width of the high density region roughly scale with the gas production rate of the...Press ° Key Words: comets, dynamics; comets, Hale–Bopp; comets, Hyakutake; spectroscopy. 1. INTRODUCTION...in March 1986 was the discovery of a shell-like region of high plasma density outside of the comet’s ionopause |  | Murphy, Melissa J., Stirling, Claudine H., Kaltenbach, Angela, Turner, Simon P., Schaefer, Bruce F. (2014) Fractionation of 238U/235U by reduction during low temperature uranium mineralisation processes. Earth and Planetary Science Letters, 388. 306-317 doi:10.1016/j.epsl.2013.11.034 | Journal (article/letter/editorial) | | http://dx.doi.org/10.1016/j.epsl.2013.11.034 ronment (Bopp et al., 2009) and may provide new insights to better...environments (Stirling et al., 2007; Weyer et al., 2008; Bopp et al., 2009; Brennecka et al., 2010a, Hiess et...2006; Stirling et al., 2007; Weyer et al., 2008; Bopp et al., 2009, 2010; Brennecka et al., 2010a); (ii)...during continental weathering (Stirling et al., 2007; Bopp et al., 2009; Hiess et al., 2012); and (iv) magmatic...environments (Stirling et al., 2007; Weyer et al., 2008; Bopp et al., 2009, 2010; Brennecka et al., 2010a). In |  | | Book | | Boring — German (West) — Oberpfalz Region. 2. Earth — pfalz Region. I. Emmermann, R. (Rolf), 1940— . Il...the deep continental crust) Crust. 3. Geology - Germany (West) — OberWohlenberg, Jiirgen, 1933- . III....Springer-Verlag Berlin Heidelberg 1989 Printed in Germany The use of registered names, trademarks, etc....Deep Drilling Program of the Federal Republic of Germany (KTB) would be drilled in the Oberpfalz area...Wide-Angte Seismic Observations Hem CHE RONDE my BOPP er NE URED as Derived from SOHMIPDIM tatereheteys |  | Kirchenbaur, Maria, Maas, Roland, Ehrig, Kathy, Kamenetsky, Vadim S., Strub, Erik, Ballhaus, Chris, Münker, Carsten (2016) Uranium and Sm isotope studies of the supergiant Olympic Dam Cu–Au–U–Ag deposit, South Australia. Geochimica et Cosmochimica Acta, 180. 15-32 doi:10.1016/j.gca.2016.01.035 | Journal (article/letter/editorial) | | Mineralogie, Universität zu Köln, 50674 Köln, Germany; mkirchen@uni-koeln.de; corresponding author 2...Steinmann-Institut, Universität Bonn, 53115 Bonn, Germany; 3 School of Earth Sciences, University of Melbourne...Nuklearchemie, Universität zu Köln, 50674 Köln, Germany ABSTRACT The Olympic Dam Cu-U-Au-Ag deposit in...found (Stirling et al., 2007; Weyer et al., 2008; Bopp et al., 2009; Brennecka et al., 2010; Montoya-Pino...contributions from the nuclear field shift effect (Bopp et al., 2009; Brennecka et al., 2010; Chernyshev |  | | Journal (article/letter/editorial) | | 18‰ for calcrete, 0.18‰ for volcanic, 0.29‰ for quartz-pebble conglomerate, 0.29‰ for sandstonehosted...studies of 238U/235U ratios in uranium deposits. Bopp et al. (2009) reported that 238U/235U ratios in...effect, which in turn, is temperature-dependent (Bopp et al., 2009; Brennecka et al., 2010a). A recent...2.1. Samples Uranium minerals from calcrete, quartz-pebble conglomerate, sandstone-hosted, intrusive...(Schmiedelberg, Germany) and Proterozoic deposits in Finland. A sample of uraninite from quartz-pebble conglomerates |  | | Book (edition) | | Englert, Ismaning, Germany U. Frisch, Nice, France P. Hänggi, Augsburg, Germany K. Hepp, Zürich, Switzerland...Switzerland W. Hillebrandt, Garching, Germany D. Imboden, Zürich, Switzerland R. L. Jaffe, Cambridge... MA, USA R. Lipowsky, Golm, Germany H. v. Löhneysen, Karlsruhe, Germany I. Ojima, Kyoto, Japan D. Sornette...Theisen, Golm, Germany W. Weise, Trento, Italy, and Garching, Germany J. Wess, München, Germany J. Zittartz...Zittartz, Köln, Germany 3 Berlin Heidelberg New York Barcelona Hong Kong London Milan Paris Tokyo Editorial |  | | Journal (article/letter/editorial) | | through binary images or (2) using a so-called ROI (region of interest) mathematical operator, which has the...chondrites and has never been observed in IDPs, whereas quartz is an abundant component of continental dust (⬃10...domains defined by each IDP. Cometary HCN (in Hale-Bopp; Meier et al., 1998b). Macromolecules from carbonaceous...the deuterium-rich HCN component, OM2. Comet Hale-Bopp is the only known object in the solar system having...are discussed in succession: 1. The dust in the region of comet formation can be viewed as a mixture of |  | | Journal (article/letter/editorial) | | fractionation decreases by more than a factor of 2 (Bopp et al., 2009). Keywords: uranium ore deposits, pitchblende...assemblages: quartz–calcite–pitchblende and sulfide–pitchblende. The formation of veins with the quartz–calcite–pitchblende...uranium veintype deposit in the Erzgebirge region, Germany is a huge stockwork confined to the contact...uranium concentrations are associ ated with the quartz–calcite–pitchblende veins of the kku formation...temperature of solutions during precipitation of kkuquartz ranged from 278 to 160°C [40]. The later pitchblende–dolomite |  | | Journal (issue) | | Franklin Micromounts Field Trip - To Limecrest Quarry Date and details to be announced later. Saturday...15th Family Day, Swap Session, etc. Bodner Quarry, Quarry Road, Rudeville, iv.J. Meeting - 2:30 P.ft...this piece is almost entirely covered by clear quartz crystals, averaging 3/8" in diameter and height...greyish calcite. Under the short wave light the quartz crystals fluoresced a good yellow, close to the...showed that the quartz crystals were not fluorescing; that some unknown mineral under the quartz but on the |  | Brennecka, Gregory A., Borg, Lars E., Hutcheon, Ian D., Sharp, Michael A., Anbar, Ariel D. (2010) Natural variations in uranium isotope ratios of uranium ore concentrates: Understanding the 238U/235U fractionation mechanism. Earth and Planetary Science Letters, 291 (1) 228-233 doi:10.1016/j.epsl.2010.01.023 | Journal (article/letter/editorial) | | 2006; Stirling et al., 2007; Weyer et al., 2008; Bopp et al., 2009). In this scenario, the ability of...study somewhat ambiguous. A more recent study by Bopp et al. (2009) examined uranium ore from six uranium...Non-redox sensitive — this setting exclusively contains quartz– pebble conglomerate deposits. These are ancient...Denison deposits of Canada are all examples of quartz–pebble conglomerate deposits. By examining the...238U/235U fractionation (Stirling et al., 2007; Bopp et al., 2009). Because 90–95% of the uranium from |  | | Journal (article/letter/editorial) | | silicate rocks I.N. Bindeman a,n, C.C. Lundstrom b, C. Bopp b, F. Huang b,c a Department of Geological Sciences...Soret experiments. Notably, the hotter, melt-rich region the AGV experiment of the Huang et al. (2009),...of an upper hot portion of 100% glass, a middle region of coexisting minerals and glass, and a lower portion...discovery of a 1.5 mm thick layer of almost pure quartz along the very bottom of the capsule in this experiment...our surprise, X-ray mapping revealed a region of almost pure quartz with only a few crystals of K-spar, |  | | Journal (article/letter/editorial) | | "0886# have reported ISO observations of comet Hale!Bopp showing a number of features in the 6Ð34 mm range...irradiation could also be varied using a focusing quartz lens[ In the present experiment it was about 0...sake of clarity we report here only the wavelength region of interest between 1499 and 0799 cm−0 "3Ð4[4 mm#[...particles[ spectrometer[ Outside the wavelength region 3Ð4[4 mm the spectra are very similar showing the...developed a coma\ due to their low temperature\ the region around 4 mm is dominated by sunlight re~ection |  | | Journal (article/letter/editorial) | | (Strel’tsovsky uranium ore field, eastern Transbaikal region). For this purpose, we used the formation temperature...2.0‰ (Stirling et al., 2007; Weyer et al., 2008; Bopp et al., 2009; Brennecka et al., 2010; Amelin et...2008; Romaniello et al., 2013), and ura nium ore (Bopp et al., 2009; Murphy et al., 2014) show, UVI → UIV...Strel’tsovsky uranium field in the eastern Transbaikal region, one of world’s largest. The uranium mineralization...estimated by homoge nization of fluid inclusions in quartz reaches 535– 500°С. The formation temperature |  | | Journal (article/letter/editorial) | | associated with the nuclear field shift effect (Bopp et al., 2009; Bopp et al., 2010; Brennecka et al., 2010a)...2006; Stirling et al., 2007; Weyer et al., 2008; Bopp et al., 2009), but have very different solubilities...bioremediation and mineral exploration studies 6 (Bopp et al., 2009; Brennecka et al., 2010a; Murphy et...the microbial experiments. Lagoa Vermelha is a region of active microbial dolomite formation, and detailed...where δ238U fractionation has been 22 documented (Bopp et al., 2010; Murphy et al., 2014; Andersen et al |  | | Book | | Neptune (Fig. 1.1). Comets probably formed in the region where Uranus and Neptune were born. Here the physical...relative distances to the giant planets and the region of comet formation. Cosmic Pinball 13 coalesce...distant orbits at the edge of the solar system in a region called the Gort cloud, named in honor of Ian Oort...3 Changes in the coma and nucleus of comet Hale-Bopp. These Hubble Space Telescope observations show...the first comet to be observed in the microwave region of the spectrum, where scientists found emissions |  | | Book | | time still receive in-depth attention - ISON, Hale-Bopp, Hyakutake, West, and others - while recent spacecraft...Plates follow page xvi. . Comet Hale-Bopp (C/1995 O1) . Comet Hale-Bopp . Comet 1/P Halley . Comet 17P/Holmes...the Great Comets Hyakutake (C/1996 B2) and Hale-Bopp (C/1995 01). In late 2013, Comet ISON (C/2012 S1)...a little sooner than that. Plate 1. Comet Hale-Bopp (C/1995 O1) imaged from Austria on March 27, 1997...exposure. Credit: Gerald Rhemann. Plate 2. Comet Hale-Bopp appeared as a true spectacle in late March 1997 |  | | Book (edition) | | Austria W. Beiglböck, Heidelberg, Germany W. Domcke, Garching, Germany B.-G. Englert, Singapore U. Frisch... Spain P. Hänggi, Augsburg, Germany W. Hillebrandt, Garching, Germany R. L. Jaffe, Cambridge, MA, USA...Janke, Leipzig, Germany R. A. L. Jones, Sheffield, UK H. v. Löhneysen, Karlsruhe, Germany M. Mangano, Geneva...Salmhofer, Heidelberg, Germany D. Sornette, Zurich, Switzerland S. Theisen, Potsdam, Germany D. Vollhardt, Augsburg...Augsburg, Germany W. Weise, Garching, Germany J. Zittartz, Köln, Germany The Lecture Notes in Physics |  | | Journal (article/letter/editorial) | | Switzerland; and Leica camera MC170 HD, Wetzlar, Germany). Accordingly, a total of 120 mycorrhizal root...Nitex 03-50/31) were filled with 50 g acid-washed quartz sand (0.36–2.00 mm, 99.6% SiO2, Carlo Bernasconi...USA), and the internal transcribed spacer (ITS) region of the nuclear rDNA was amplified using ITS1F (Gardes...according to Rosenstock et al. (2016). The ITS2 region of the mesh bag DNA extracts were amplified using...(Schloss et al., 2009). Sequences outside the ITS2 region and chimeric sequences were removed using ITSx |  | Driesner, T., Ha, T.-K., Seward, T.M. (2000) Oxygen and hydrogen isotope fractionation by hydration complexes of Li+, Na+, K+, Mg2+, F−, Cl−, and Br−: a theoretical study. Geochimica et Cosmochimica Acta, 64 (17) 3007-3033 doi:10.1016/s0016-7037(00)00407-5 | Journal (article/letter/editorial) | | were calculated. Following a scheme introduced by Bopp et al. (1974) we used the gas-phase results to model...aqueous solutions on a molecular scale (Taube, 1954; Bopp et al., 1974, 1977; O’Neil and Truesdell, 1991)...aqueous solution isotope salt effects was suggested by Bopp et al. (1974). In this model it is assumed that...Experimental Results The realism of the calculated Bopp model oxygen isotope effects can quite directly...Comparisons of hydrogen isotope effects from the Bopp models with experimental results are usually unsatisfactory |  | Shiel, A.E., Johnson, T.M., Lundstrom, C.C., Laubach, P.G., Long, P.E., Williams, K.H. (2016) Reactive transport of uranium in a groundwater bioreduction study: Insights from high-temporal resolution 238U/235U data. Geochimica et Cosmochimica Acta, 187. 218-236 doi:10.1016/j.gca.2016.05.020 | Journal (article/letter/editorial) | | Hinojosa et al., 2016), and roll front U ore deposits (Bopp et al., 2009; Brennecka et al., 2010). Together...natural redox settings (Murphy et al., 2014). Further, Bopp et al. (2010) provided evidence for this isotopic...geochemical changes. Although a previous study (Bopp et al., 2010) presented 238U/235U ratio data for...of Quaternary floodplain sediments dominated by quartz, with significant amounts of plagioclase and K-feldspar...(Stirling et al., 2005, 2006, 2007; Weyer et al., 2008; Bopp et al., 2009, 2010). We added a spike with a 233U/236U |  | | Journal (issue) | | will be captured again next spring, when comet Hale-Bopp-with the potential to be even brighterflies through...000 feet) of sediments in a tectonically inactive region, the crater has been protected from erosion. The...fossils in the sediments exposed in a limestone quarry on Albion Island in the Rio Hondo gave us insight...January 1996. We began our work in the limestone quarry on Albion Island, and then extended our reach to...burnt landscape. In the Gulf of MexicolCaribbean region, the impact set off destructive earthquakes and |  | | Journal (article/letter/editorial) | | hydrogen bonding network across the interfacial region. For the hydrophilic but charged hydrotalcite and...(Yeganeh et al., 1999) and crystalline or fused quartz (SiO2) (Du et al., 1994; Ostroverkhov et al., 2004)...iso-electric point of the surface. At the water–quartz interface at both low (2) and high (12) pH, interfacial...spectroscopic features similar to those of the ice–quartz interface. At intermediate pHs the surface water...OH2 O density maxima are also about 3 Å apart (Bopp and Heinzinger, 1998; Dimitrov et al., 2001). The |  | Jemison, Noah, Reimus, Paul, Harris, Rose, Boukhalfa, Hakim, Clay, James, Chamberlain, Kevin (2020) Reduction and potential remediation of U(VI) by dithionite at an in-situ recovery mine: Insights gained by δ238U. Applied Geochemistry, 115. 104560 doi:10.1016/j.apgeochem.2020.104560 | Journal (article/letter/editorial) | | the extent of U(VI) reduction in field settings (Bopp et al., 2010; Murphy et al., 2014; Basu et al.,...muted ε (0.25‰– 0.78‰) to estimate U(VI) reduction (Bopp et al., 2010; Murphy et al., 2014; Basu et al.,...for mass bias of the MC-ICPMS (Weyer et al., 2008; Bopp et al., 2010). IRMM-3636 was used at University...ε of 0.4‰, similar to pre vious field studies (Bopp et al., 2010; Murphy et al., 2014; Basu et al.,...successfully demonstrated here and in previous studies (Bopp et al., 2010; Murphy et al., 2014; Basu et al., |  | | Journal (article/letter/editorial) | | Accepted: 3 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract The free...Error bars are 2σ standard errors, and highlighted region is the 95% confidence interval of the linear fit...obtained by a fit to the data in Table 1. Shaded region denotes 95% confidence interval. Dotted lines are...(2017) Estimates of point defect production in α-quartz using molecular dynamics simulations. Model Simul...Knittle E, Buffett BA (eds) The core-mantle boundary region, vol 28. American geophysical union. Washington |  | | Report (issue) | | texture. Depending on the relative proportions of quartz, feldspars and accessory minerals, and the grain...encompass the whole of this range of rock types. Quartz Silica exists as several polymorphs all based on...of pressure (P) and temperature ( T ). a and /3 quartz are the stable polymorphs at atmospheric pressure...granite mineralogy comprises predominant feldspar and quartz (light coloured or felsic phases) with subsidiary...mica or amphibole (dark coloured or mafic phases). Quartz (Si02) and feldspar (Na, Ca, K aluminosilicates) |
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