 | | Journal (article/letter/editorial) | | 1511–1527 Geochemistry of Jasper Beds from the Ordovician Løkken Ophiolite, Norway: Origin of Proximal and...Exhalites TOR GRENNE† Geological Survey of Norway, N-7491 Trondheim, Norway AND JOHN F. SLACK U.S. Geological...Reston, Virginia 20192 Abstract Stratiform beds of jasper (hematitic chert), composed essentially of SiO2...kilometers along strike in the Ordovician Løkken ophiolite, Norway. These siliceous beds are closely associated... Concentrations of chalcophile elements in the jasper beds are at the parts per million level implying |  | | Journal (article/letter/editorial) | | Slack Bedded jaspers of the Ordovician Løkken ophiolite, Norway: seafloor deposition and diagenetic maturation...Sedimentary beds of jasper (red hematitic chert) in the Ordovician Løkken ophiolite of Norway are closely associated...laterally peripheral to the large Løkken (25–30 Mt) and small Høydal (0.1 Mt) VMS deposits, and are exposed...strike. Massive or laminated types predominate; jasper-sulphide debris-flow deposits are also abundant...(&) Geological Survey of Norway, Leiv Eirikssons vei 39, 7491 Trondheim, Norway E-mail: tor.grenne@ngu |  | | Journal (article/letter/editorial) | | volcanogenic sulphide occurrence in the Løkken greenstones, Central Norway KENNETH GEORGE McQUEEN McQueen,...volcanogenic sulphide occurrence in the Løkken greenstones, Central Norway. Norsk Geologisk Tidsskrift. Vol...copper-zinc deposit is a small, green deposit in Norway; however, after more than 300 stone-hosted, pyritic... 8.5 km west of Løkken Verk in the western removed and mining operations at Løkken and in Trondheim...Trondheim district of central Norway (Fig. 1). the surrounding area have now ceased. The deposit was probably |  | | Journal (article/letter/editorial) | | silicate, sulfide, and oxide iron formations in Norway: evidence for fluctuating redox states of early...associated with jasper (hematitic chert) beds and volcanogenic massive sulfide (VMS) deposits in Norway provide...H2) produced from large seafloor systems such as Løkken may have changed the redox state of seawater in...Geological Survey of Norway (NGU), Postal Box 6315 Torgarden, NO-7491 Trondheim, Norway 2 U.S. Geological...USA Recent studies of iron formation, including jasper (hematitic chert; low-grade oxide-facies iron formation) |  | Dodd, Matthew S., Papineau, Dominic, Grenne, Tor, Slack, John F., Rittner, Martin, Pirajno, Franco, O’Neil, Jonathan, Little, Crispin T. S. (2017) Evidence for early life in Earth’s oldest hydrothermal vent precipitates. Nature, 543 (7643) 60-64 doi:10.1038/nature21377 | Journal (article/letter/editorial) | | sedimentary units including iron formations and minor jasper (quartz-rich rocks with haematite and magnetite)...volcanism19. Bulkrock rare earth element data for the NSB jasper and carbonate iron formations—especially the presence...20–3,000-μm chalcopyrite crystals within the NSB jasper and carbonate iron formations (Extended Data Fig... 3Geological Survey of Norway, Leiv Eirikssons vei 39, 7040 Trondheim, Norway. 4U.S. Geological Survey...Nature. All rights reserved. Article RESEARCH a b Løkken 40 μm 50 μm 40 μm c d 25 μm d 70 μm 100 |  | Moeller, Kirsten, Schoenberg, Ronny, Grenne, Tor, Thorseth, Ingunn H., Drost, Kerstin, Pedersen, Rolf B. (2014) Comparison of iron isotope variations in modern and Ordovician siliceous Fe oxyhydroxide deposits. Geochimica et Cosmochimica Acta, 126. 422-440 doi:10.1016/j.gca.2013.11.018 | Journal (article/letter/editorial) | | University of Bergen, Allégaten 41, 5007 Bergen, Norway b Department of Geosciences, University of Tübingen...c Geological Survey of Norway, Leiv Eirikssons vei 39, 7040 Trondheim, Norway Received 31 October 2012;...variations in Ordovician jasper beds from the Løkken ophiolite complex, Norway, which have been interpreted...Fe oxyhydroxide deposits. Iron isotopes in the jasper samples have higher d56Fe values (0.38& to +0...modern hydrothermal Fe oxyhydroxides and Phanerozoic jasper beds. Siliceous Fe oxyhydroxide deposits related |  | | Journal (article/letter/editorial) | | deposits metamorphosed at temperatures <425ºC: Løkken in Norway (Grenne, 1989a), Baia Borsa in Romania (Cook...Deposit 896 The Løkken ore deposit is located in the Trondheim district, Norway (Grenne, 1986, 1989a...ore horizons are accompanied by characteristic jasper horizons (Grenne and Slack, 2003b). Peak metamorphic...investigated in this study (Parys Mountain: 1, Løkken: 2, Greens Creek: 3 and Baia Borsa: 4). The mean...diamond-drill cores through the main sulphide ore body at Løkken. Greens Creek Ore Deposit The Greens Creek ore |  | | Journal (article/letter/editorial) | | the Uppermost Allochthon (UmA) mostly in northern Norway. The Neoproterozoic and Cambrian history of this...á P.M. Ihlen Geological Survey of Norway, N-7491 Trondheim, Norway e-mail: tor.grenne@ngu.no F.M. Vokes...Engineering, Hùgskoleringen 6, N-7491 Trondheim, Norway host to two characteristic types of stratabound-stratiform...20 Mt were known at the now abandoned Tverrfjell mine and the recently closed Joma deposit. Minor Cu-Ni...higher levels in the nappe pile, in southwestern Norway, the western Trondheim Region, the western Grong |  | | Journal (issue) | | publishing channel of all scientific meetings held in Norway with a geological content. Editors: Hans Arne Nakrem...Norges Geologiske Undersøkelse N‐7491 Trondheim, Norway E‐mail: ngf@geologi.no www.geologi.no Published...Norges Geologiske Undersøkelse N‐7491 Trondheim, Norway E‐mail: ngf@geologi.no www.geologi.no NGF Abstracts...Abstracts and Proceedings Of the Geological Society of Norway Number 1, 2017 Vinterkonferansen 2017 Oslo, January...Petroleum Guri V. Ganerød, Geological Survey of Norway Dag Helland Hansen, Aker BP Jean Sebastien L’Herureuz |  | | Report (issue) | | post-depositional processes in uranium ores at the Stanleigh mine, Elliot Lake, Ontario, Canada.....................botryoids at a 350 Ma fossil warm spring at the Tynagh mine, Ireland: (A) The top surface (field of view measures...from the Fairview mine in an ESE direction out of the orebody toward the Sheba mine, in the central part...origin of 3.4 to 3.1 Ga pyrite at the Princeton gold mine, Barberton Greenstone Belt, South Africa: Precambrian...mineralized, felsic porphyry (ca. 3126 Ma Fairview Mine porphyry; de Ronde et al., 1991) and the ca. 3105 |
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