 | | Journal (article/letter/editorial) | | Chemie der Erde 72 (2012) 261–278 Contents lists available at SciVerse ScienceDirect Chemie der Erde...elsevier.de/chemer The fluorite deposits NE of Regensburg, SE Germany—A mineralogical and chemical comparison...D-30631 Hannover, Germany Bürgermeister-Knorr Str. 8, D-92637 Weiden i.d.OPf., Germany In der Zell 4, D-93149...D-93149 Nittenau, Germany a r t i c l e i n f o Article history: Received 21 November 2011 Accepted 6...distribution SE Germany a b s t r a c t A world-class fluorite mining district was located NNE of Regensburg at Nabburg-Wölsendorf |  | | Journal (article/letter/editorial) | | 1016/j.oregeorev.2019.103304 This is a PDF file of an article that has undergone enhancements after acceptance...Leibniz University, Welfengarten 1 D-30167 Hannover, Germany Abstract The Central European Variscides and their...grade and several phyllosilicates can be used as an ore guide to non-clay mineral deposits. Time, climate...the geological age of formation is synonymous with an increase of the P-T regime where important boundaries...Central Europe. They indicate an ensialic geodynamic regime in Mesoeurope and an ensimatic regime in Neoeurope |  | | Journal (article/letter/editorial) | | partial tables of contents of a number of journals as an information service. Please do not write to us to...waste clay from the Sardes (Salihli) placer gold mine and its utilization in floor-tile manufacture— lker...supergene U-Cu nontronite-bearing mineralization at Nabburg-Wölsendorf, southeastern Germany—Harald G. Dill...complexes of the Dambukinskii ore region of the Upper Amur area—A.V. Mel’nikov, V.G. Moiseenko, and V...13 23 35 GEOCHIMICA ET COSMOCHIMICA ACTA CHEMIE DER ERDE Geochemical exploration for gold in the Nile |  | Bach, Wolfgang, Alt, Jeffrey C., Niu, Yaoling, Humphris, Susan E., Erzinger, Jörg, Dick, Henry J.B. (2001) The geochemical consequences of late-stage low-grade alteration of lower ocean crust at the SW Indian Ridge: results from ODP Hole 735B (Leg 176) Geochimica et Cosmochimica Acta, 65 (19) 3267-3287 doi:10.1016/s0016-7037(01)00677-9 | Journal (article/letter/editorial) | | Ridge: Results from ODP Hole 735B (Leg 176) WOLFGANG BACH,1,*, JEFFREY C. ALT,2 YAOLING NIU,3 SUSAN E. HUMPHRIS...Potsdam, Telegrafenberg Haus B, D-14473 Potsdam, Germany (Received August 10, 2000; accepted in revised...Recent studies have shown that lower crustal and upper mantle lithologies make up a significant fraction...topography of slow spread crust exposing lower crust and upper mantle facilitates prolonged fluid circulation,...Elsevier Science Ltd lation in ridge flanks plays an important role rivaling that of axial hydrothermal |  | | Journal (article/letter/editorial) | | UniversitûÊt Bremen, Klagenfurter Str., 28359 Bremen, Germany Leibniz-Institut fur Meereswissenschaften, IFM-GEOMAR...Gebaude Ostufer Wischhofstr. 1-3, 24148 Kiel, Germany c School of Earth and Ocean Sciences, University...crust–ocean mass-balances but also to characterize an important input to the subduction zones. We have...in the basalts which make up the surface of the upper crust caused by low-temperature alteration. Fresh...evidence for a slight change in redox conditions, from an oxidizing, water-dominated to a more reducing, rock-dominated |  | | Journal (article/letter/editorial) | | Sciences, University of Hamburg, 20146 Hamburg, Germany Department of Biology, University of Southern Denmark...supra-subduction zone as an ocean spreading ridge in the Tethys Ocean during the Upper Cretaceous [19]. Crystallization...Troodos Terrains [20]. Continued movement during the upper Miocene, Pliocene, and Pleistocene contributed to...of setting. The sampling was done in Mathiatis mine, an old open pit in which Au, Ag and Fe was mined...(Figure 1). The mine stratigraphy involves pyrite-rich quartzite at the bottom of the mine overlain by brecciated |  | | Journal (article/letter/editorial) | | necessary to convert an ultramafic protolith into a quartz–magnesite rock. Nevertheless, an external supply...serpentinized peridotites (e.g., Bach et al., 2004; Dick, 1974; Frost, 1985; Klein and Bach, 2009; Nickel, 1959;...magnetite assemblage in serpentinite (e.g., Klein and Bach, 2009) to a sulfur-rich hematite–pyrite assemblage...2003). Most experiments were successful in producing an assemblage consisting of Mg-rich carbonate and a...moderate increases in pressure (up to 100 MPa) result in an increase of only a few degrees Celsius for the reactions |  | Severmann, Silke, Mills, Rachel A., Palmer, Martin R., Telling, Jon P., Cragg, Barry, John Parkes, R. (2006) The role of prokaryotes in subsurface weathering of hydrothermal sediments: A combined geochemical and microbiological investigation. Geochimica et Cosmochimica Acta, 70 (7) 1677-1694 doi:10.1016/j.gca.2005.12.008 | Journal (article/letter/editorial) | | size associated with the active redox boundary in an upper metal sulphide layer (50–70 cm) around which active...pyrite surfaces and Zn and Pb remobilisation in the upper sediment. Although prokaryotic populations are present...massive sulphide deposits may be restricted to the upper portion of the deposit that is influenced by near...dissolved species, hydrothermal minerals provide an energy source for chemolithotrophic growth that may...hydrothermal site to test the hypothesis that microbes play an important role in the subsurface diagenesis of metal-rich |  | Anderson, Melissa O., Hannington, Mark D., McConachy, Timothy F., Jamieson, John W., Anders, Maria, Wienkenjohann, Henning, Strauss, Harald, Hansteen, Thor, Petersen, Sven (2019) Mineralization and Alteration of a Modern Seafloor Massive Sulfide Deposit Hosted in Mafic Volcaniclastic Rocks. Economic Geology, 114 (5) 857-896 doi:10.5382/econgeo.4666 | Journal (article/letter/editorial) | | Research Kiel, Wischhofstrasse 1–3, Kiel 24148, Germany 3 Neptune 4 Department Minerals, Inc., 3/30 Woolcott...Wilhelms-Universität, Corrensstrasse 24, Münster 48149, Germany Abstract Tinakula is the first seafloor massive...seafloor, mostly inactive chimneys and mounds cover an area of ~77,000 m2 and are partially buried by volcaniclastic...and temperature as (1) montmorillonite/nontronite, (2) nontronite + corrensite, (3) illite/ smectite +...zones (e.g., Ansel and Amulet deposits, Noranda district, Québec: Kerr and Gibson, 1993; Gibson and Galley |  | Mitsunobu, S., Suzuki, Y., Watanabe, K., Yang, K., Kim, J.W. (2018) μXAFS and TEM studies of Fe(III) oxides precipitated on submarine basaltic glass from South Pacific Gyre. Chemical Geology, 501. 51-57 doi:10.1016/j.chemgeo.2018.10.005 | Journal (article/letter/editorial) | | 1. Introduction Alteration of oceanic basalts is an important water-rock interaction ubiquitously occurring...a geological timescale even at low temperature (Bach and Edwards, 2003), and Fe(III)-containing hydroxides...positive charge, thus the Fe(III) (hydr)oxides play an important role as a source of Fe and P for microorganisms...dissolution behavior of Fe(III) (hydr)oxides (van der Zee et al., 2003; Waychunas et al., 2005). All Fe...using a clean blade and dispersed in methanol in an ultrasonic bath. The specimen for TEM and EELS analyses |  | | Journal (article/letter/editorial) | | downwelling limb, (2) a root (or reaction) zone, and (3) an upwelling limb with a discharge zone at the mouth... For example, chimneys at the Rainbow field have an outermost zone of massive finegrained sphalerite...to basalts usually contain an inner zone of massive Cu–Fe sulfides and an outer zone of chalcopyrite...hydrothermal genesis consists there of sulfides, nontronite (a mineral of the montmorillonite group), and...kbar, hydrostatic pressure at a depth of 4 km in an ocean) and entropy. The calculated temperature values |  | | Journal (article/letter/editorial) | | associated with the activity of microorganisms is an important process for biofilm preservation and may...leading to the formation of authigenic minerals. An important characteristic, therefore, of all cellular...(PANalytical B.V., Almelo, The Netherlands) equipped with an X’celerator silicon-strip detector. The range 5–80◦...distributed over 1024 channels and were calibrated against an a-Fe foil before folding and spectral fitting using...grains tangentially attached to the cell wall [7]. An early cellularly bound iron-phase seems to act as |  | | Journal (article/letter/editorial) | | Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and...Further precipitates from hydrothermal fluids form an extensive accumulation of reduced sulfides and other...Sulfurovum grow chemolithoautotrophically using sulfur as an energy source. Similar communities were also found...including Desulfurobacterium indicum was isolated from an Indian Ocean hydrothermal vent [43] and from SWIR...isolated from deep-sea vents. Pyrolobus fumarii, an archaeon in the phylum Crenarchaeota, was also isolated |  | | Journal (article/letter/editorial) | | formed and exposed to seawater, thus representing an environment energetically favorable to sustaining...chemolithoautotrophs to harness the redox energy. An initial appraisal of the potential size of biomass...resemble those in the sedimentary deep biosphere (Bach and Edwards, 2003). Chemolithoautotrophy is of particular...Geosciences and MARUM, University of Bremen, Bremen, Germany. Department of Systems Innovation, School of Engineering...Reduced elements (Fe, Mn, S) in rocks and minerals are an additional source of energy, and these substrates |  | Zeyen, Nina, Benzerara, Karim, Menguy, Nicolas, Brest, Jessica, Templeton, Alexis S., Webb, Samuel M., Gérard, Emmanuelle, Moreira, David, López-García, Purificación, Tavera, Rosaluz, Morin, Guillaume (2019) Fe-bearing phases in modern lacustrine microbialites from Mexico. Geochimica et Cosmochimica Acta, 253. 201-230 doi:10.1016/j.gca.2019.03.021 | Journal (article/letter/editorial) | | org/10.1016/j.gca.2019.03.021 This is a PDF file of an unedited manuscript that has been accepted for publication...transformed by diverse microorganisms, serving as an electron donor or acceptor for various microbial...volcanic belt (TMVB), a continental volcanic arc with an East-West orientation (Ferrari et al., 2012). Lake...serum bottles sealed with a butyl rubber stopper and an aluminum cap (0.5 g of hydrated precipitate per flask)...containing 100 ml of water. Flasks were placed in an oven for 7 days at 80°C. Finally, the solutions were |  | Silantyev, S. A., Novoselov, A. A., Krasnova, E. A., Portnyagin, M. V., Hauff, F., Werner, R. (2012) Silicification of peridotites at the stalemate fracture zone (Northwestern Pacific): Reconstruction of the conditions of low-temperature weathering and tectonic interpretation. Petrology, 20 (1) 21-39 doi:10.1134/s0869591112010055 | Journal (article/letter/editorial) | | Sciences (IFM–GEOMAR), Wischhofstr, 1–3, 24148 Kiel, Germany Received May 11, 2011 Abstract—During cruise SO2011b...and was supposedly formed by the tectonic uplift of an oceanic lithospheric block of Cretaceous (?) age...investigations were crushed at IFM–GEOMAR (Kiel, Germany). For chemical analysis, a 1–5 mm fraction was...elements. The measurement of standard samples indicated an analytical accuracy of 0.02% relative and a precision...COMPexPro™ excimer laser coupled with an Olympus microscope and an Agilent 7500c quadrupole inductively |  | | Journal (article/letter/editorial) | | total iron and ranging down to around 1.8 [21,22]. An alternative mechanism for incorporating Fe3+ in serpentine...Mg–serpentine/greenalite/hisingerite solutions. that the upper compositional limit is slightly curved concave down...down. Isopleths for Mg and Fe3+/ΣFe3+ that the upper compositional limit is slightly curved concave down...apparently owing to the presence of some saponite or nontronite impurity [24]. Table 1. Average microprobe analyses...Fe(OH)2 properties were taken from McCollom and Bach [34]. All other thermodynamic data for relevant |  | Fowler, Andrew P.G., Zierenberg, Robert A., Reed, Mark H., Palandri, James, Óskarsson, Finnbogi, Gunnarsson, Ingvi (2019) Rare earth element systematics in boiled fluids from basalt-hosted geothermal systems. Geochimica et Cosmochimica Acta, 244. 129-154 doi:10.1016/j.gca.2018.10.001 | Journal (article/letter/editorial) | | org/10.1016/j.gca.2018.10.001 This is a PDF file of an unedited manuscript that has been accepted for publication...sample directly (Craddock et al., 2010; Humphris and Bach, 2005; Möller et al., 2003; Möller et al., 2008;...does not control hydrothermal fluid REE patterns (Bach and Irber, 1998; Beermann et al., 2017). Indeed...and modify fluid REEN patterns (Bach et al., 2003; Craddock and Bach, 2010; Craddock et al., 2010; Sanada...fractionation in geothermal and hydrothermal fluids (e.g. Bach et al., 2003; Bao et al., 2008; Craddock et al. |  | Slack, John F., Shanks, Wayne C., Ridley, W. Ian, Dusel-Bacon, Cynthia, DesOrmeau, Joel W., Ramezani, Jahandar, Fayek, Mostafa (2019) Extreme sulfur isotope fractionation in the Late Devonian Dry Creek volcanogenic massive sulfide deposit, central Alaska. Chemical Geology, 513. 226-238 doi:10.1016/j.chemgeo.2019.03.007 | Journal (article/letter/editorial) | | 1016/j.chemgeo.2019.03.007 This is a PDF file of an unedited manuscript that has been accepted for publication...Massachusetts Institute of Technology, Cambridge, M AN US CR a MA 02139, USA. ED Department of Geological...Rayleigh distillation in pore water, producing δ34SSO4 AN values up to 58 ‰; normal Late Devonian seawater...isotope studies CR (34S) have been utilized as an important tool for discriminating between BSR and...sulfide minerals coupled with AN interpretations of BSR and HSR processes in an ancient VMS deposit, using |  | | Journal (article/letter/editorial) | | GeoForschungsZentrum, Telegrafenberg C 120, D-14473 Potsdam, Germany a r t i c l e i n f o Article history: Received...composition of the mantle (Hofmann and White, 1982; Bach and Edwards, 2003). The majority of studies of ocean...similar to K (Schramm et al., 2005). There is also an exchange of Sr during palagonite formation: isotopic...for TEM preparation of rocks and minerals is to use an argon ion beam to mill down a sticky wax thin section...al., 2001). Focused ion beam (FIB) milling offers an excellent alternative. In the past several years |  | Cockell, C.S., van Calsteren, Peter, Mosselmans, J. Fred W., Franchi, Ian A., Gilmour, Iain, Kelly, Laura, Olsson-Francis, Karen, Johnson, Diane (2010) Microbial endolithic colonization and the geochemical environment in young seafloor basalts. Chemical Geology, 279 (1) 17-30 doi:10.1016/j.chemgeo.2010.09.015 | Journal (article/letter/editorial) | | show that the interior of fresh basaltic glass is an endolithic habitat for microorganisms, but that the...production may be well over a billion tonnes a year (Bach and Edwards, 2003). As basaltic glass contains many...and also reduced Fe, which could potentially act as an electron donor for biological iron oxidation, then...in different environments and ages of material is an area of intense investigation. Investigating whether...these authors suggested that this is evidence for an iron-cycle within seafloor basalts. Phylogenetic analysis |  | Benzerara, K., Menguy, N., Banerjee, N.R., Tyliszczak, Tolek, Brown, G.E., Guyot, F. (2007) Alteration of submarine basaltic glass from the Ontong Java Plateau: A STXM and TEM study. Earth and Planetary Science Letters, 260 (1) 187-200 doi:10.1016/j.epsl.2007.05.029 | Journal (article/letter/editorial) | | geochemistry and dynamics (e.g., Hofmann and White, 1982; Bach et al., 2003) and the O2 content of the atmosphere...Schramm et al., 2005). Over the two last decades, an increasing number of studies have proposed that microbes...in the oceanic crust leading to the inference that an extensive subsurface biosphere exists within the...on synchrotron radiation. These techniques provide an unprecedented insight into the compositional variations...analyses were performed using a JEOL detector with an ultrathin window allowing detection of light elements |  | | Journal (article/letter/editorial) | | which analyses from new samples have been obtained. An updated review of the literature published about...oxic-diagenesis within the underlying sediments, leading to an upward supply of Mn and Fe from the sediment column...and Tazaki [59] propose that the formation of nontronite (a Fe-rich dioctahedral smectite commonly related...northernmost end of the Rifian Calcareous Chain (Figure 1), an area corresponding to the Jbel Moussa Group [63]...limestones (Upper Ammonitico Rosso Fm) in the Eastern External Subbetic (Figure 3). The Upper Jurassic is |  | Templeton, A. S., Knowles, E. J., Eldridge, D. L., Arey, B. W., Dohnalkova, A. C., Webb, S. M., Bailey, B. E., Tebo, B. M., Staudigel, H. (2009) A seafloor microbial biome hosted within incipient ferromanganese crusts. Nature Geoscience, 2 (12) 872-876 doi:10.1038/ngeo696 | Journal (article/letter/editorial) | | amounts of vivianite and Fe(iii) smectite such as nontronite (Supplementary Fig. S5). Extensive formation...formation of Fe-rich microbial mats and nontronite deposits occurs within the hydrothermally active pit craters...importance of oxidative basalt alteration in providing an energy flux to the associated microbial biofilms...formation versus basalt dissolution in providing an energetic basis for microbial life on the sea floor...quenched Kilauea lava was placed on the sea floor in an open polyvinyl chloride basket for 1 year and then |  | | Journal (article/letter/editorial) | | Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and...as one of the representative areas to reconstruct an ancient lacustrine and habitable environment [3]...case of total pressure of 1 bar) is required [34]. An important feature of the water–rock reactions in...under gas exchangeable condi4. Results tions, nontronite, kaolinite,and and quartz are suggested as the...dominated the carbonate solid solution at W/R nontronite, kaolinite, and quartz are suggested as the dominant |
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