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  • 1
    Online-Ressource
    Online-Ressource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Schlagwort(e): Geochemistry. ; Historical geology. ; Earth -- Origin. ; Earth -- Internal structure. ; Baltic Shield. ; Electronic books.
    Beschreibung / Inhaltsverzeichnis: This is the third of three volumes that survey the Palaeoproterozoic Eon with a focus on Fennoscandian Shield geology, reviewing early Palaeoproterozoic events coincident with Earth's progressive oxygenation. Includes photos of the FAR-DEEP core collection.
    Materialart: Online-Ressource
    Seiten: 1 online resource (520 pages)
    Ausgabe: 1st ed.
    ISBN: 9783642296703
    Serie: Frontiers in Earth Sciences Series
    DDC: 551.72
    Sprache: Englisch
    Anmerkung: Intro -- Reading the Archive of Earth's Oxygenation -- Volume 3: Global Events and theFennoscandian Arctic Russia - Drilling Early Earth Project -- Dedication -- Contributors to Three-Volume Treatise Reading the Archive of Earth's Oxygenation, Volume 3: Global Events and the Fennoscandian Arctic Russia: Drilling Early Earth Project -- Reviewers for Three-Volume Treatise: Reading the Archive of Earth's Oxygenation -- Acknowledgements -- Preface to Volume 3 -- Contents to Volume 1 -- Contents to Volume 2 -- Contents to Volume 3 -- Part VII: Earth´s Oxygenation and Associated Global Events: The FAR-DEEP Perspective -- 7.1 The End of Mass-Independent Fractionation of Sulphur Isotopes -- 7.1.1 Introduction -- 7.1.2 Multiple Sulphur Isotope Systematics -- 7.1.3 The Multiple Sulphur Isotope Record of Precambrian Sedimentary Rocks -- 7.1.4 The Termination of Mass-Independently Fractionated Sulphur: Implications for the FAR-DEEP Core Material -- References -- 7.2 Huronian-Age Glaciation -- 7.2.1 Introduction -- 7.2.2 Palaeoproterozoic Glacial Deposits of North America -- Ramsay Lake Formation -- Bruce Formation -- Gowganda Formation -- Lower Gowganda Member -- Upper Gowganda Member -- Summary of Huronian Supergroup -- Other Occurrences of Palaeoproterozoic Glaciogenic Rocks in North America -- Lake Superior Area -- South Dakota -- SE Wyoming -- Hurwitz Group, Nunavut -- Chibougamau Area, Québec -- Summary of North American Occurrences of Palaeoproterozoic Glaciogenic Rocks -- 7.2.3 Palaeoproterozoic Glacial Deposits of South Africa -- Griqualand West Basin -- Transvaal Basin -- Diamictite Correlation and Implication for Their Depositional Environments -- 7.2.4 Palaeoproterozoic Glacial Deposits of Australia -- 7.2.5 Palaeoproterozoic Glacial Deposits of Fennoscandia -- The Urkkavaara Formation -- 7.2.6 Palaeoproterozoic Snowball Earth?. , Improving the Chronology of Huronian Glaciation -- What Caused Huronian Glaciation? -- 7.2.7 Implications of the FAR-DEEP Core 3A -- References -- 7.3 The Palaeoproterozoic Perturbation of the Global Carbon Cycle: The Lomagundi-Jatuli Isotopic Event: -- 7.3.1 The Global Carbon Cycle and Its Principal Reservoirs and Fluxes -- 7.3.2 Historical Overview -- 7.3.3 Review of Available Radiometric Ages Constraining the Lomagundi-Jatuli Positive Isotopic Excursion of Carbonate Carbon -- Initiation of the Lomagundi-Jatuli Event -- Termination of the Lomagundi-Jatuli Event -- Global Timing of the Lomagundi-Jatuli Event -- 7.3.4 Lomagundi-Jatuli Excursion as Seen from the Fennoscandian Shield Record -- The Pechenga Greenstone Belt -- Summary -- The Imandra/Varzuga Greenstone Belt -- Summary -- The Onega Basin -- Summary -- The Kalix Greenstone Belt -- Summary -- Other Fennoscandian Examples -- Summary -- delta13C Distribution Patterns of the Lomagundi-Jatuli Age Sedimentary Carbonates in the Fennoscandian Shield -- 7.3.5 The Lomagundi-Jatuli Isotopic Excursion: Unresolved Problems and Implications of FAR-DEEP Core for Future Work -- References -- 7.4 An Apparent Oxidation of the Upper Mantle versus Regional Deep Oxidation of Terrestrial Surfaces in the Fennoscandian Shield -- 7.4.1 Introduction -- Why the Fennoscandian Shield? -- The ``Great Oxidation Event´´ -- Hypotheses for the ``Great Oxidation Event´´ -- Increase in O2 Production -- Decrease in O2 Sinks -- Brief Overview of Mantle Redox and Its Evolution -- Gradual Oxidation of the Mantle -- Unchanged Mantle Redox State -- 7.4.2 Kuetsjärvi Volcanic Formation -- Field Descriptions -- The Geochemistry of Iron in Kuetsjärvi Volcanic Rocks -- Oxidised Surface and Groundwater -- Implications for FAR-DEEP Research -- Magmatic Palaeoredox Proxies -- Palaeosols. , Alteration by Groundwater and Hydrothermal Fluids -- Summary -- References -- 7.5 Abundant Marine Calcium Sulphates: Radical Change of Seawater Sulphate Reservoir and Sulphur Cycle: -- 7.5.1 Introduction -- 7.5.2 The Global Sulphur Cycle During Phanerozoic Time -- 7.5.3 Isotopic Evidence for Precambrian Oceanic Sulphate Abundance -- 7.5.4 Multiple Sulphur Isotope Evidence for the Early Palaeoproterozoic Rise in Oceanic Sulphate Abundance -- 7.5.5 Physical Evidence for Abundant Oceanic Sulphate in the Palaeoproterozoic -- 7.5.6 A Radical Change of the Seawater Sulphate Reservoir: Implication of the FAR-DEEP Core -- References -- 7.6 Enhanced Accumulation of Organic Matter: The Shunga Event: -- 7.6.1 Introduction -- 7.6.2 World-Wide Record of Palaeoproterozoic Carbonaceous Sediments Representing the Shunga Event with Emphasis on the Fennosc... -- 7.6.3 The Shunga Event: A Tale of Productivity and Preservation of Organic Matter in the Early Palaeoproterozoic Ocean -- The Nature of Primary Productivity in the Early Palaeoproterozoic Ocean -- 7.6.4 Giant Palaeoproterozoic Petrified Oil Field in the Onega Basin -- Source Rocks -- Estimated Oil Reserve -- Evidence for Oil Generation and Its Timing -- Time Constraint on Oil Generation -- Oil Migration Pathways -- Oil Traps -- Organosiliceous Rocks or Maksovite -- The Type Locality Maksovo -- FAR-DEEP Hole 12B -- Formation of Maksovite/Organosiliceous Rocks: A Seafloor Hydrocarbon Expulsion? -- Clastic Pyrobitumen and Surface Oil Seeps -- 7.6.5 Possible Driving Forces for the Onset of the Shunga Event and Implication of FAR-DEEP Core for the Shunga Event -- References -- 7.7 The Earliest Phosphorites: Radical Change in the Phosphorus Cycle During the Palaeoproterozoic: -- 7.7.1 Introduction to the Phosphorus Cycle -- 7.7.2 Formation of Phosphorites: Phosphogenesis -- 7.7.3 Palaeoproterozoic Phosphorites. , C. 2000Ma Lower Aravalli Group, Rajasthan, India -- Phosphorites of the Palaeoproterozoic Fennoscandian Shield -- Il´mozero Sedimentary Formation, Imandra/Varzuga Greenstone Belt, Kola Peninsula, Russia -- Pilgujärvi Sedimentary Formation, Pechenga Greenstone Belt, Kola Peninsula, Russia -- Zaonega Formation, Onega Palaeobasin, Karelia, Russia -- 7.7.4 Significance of Phosphorites in the Geologic Record and Implications of the FAR DEEP Material -- References -- 7.8 Traces of Life: -- 7.8.1 Introductory Remarks -- 7.8.2 Palaeoproterozoic Stromatolites from the Lomagundi-Jatuli Interval of the Fennoscandian Shield -- Introduction -- What Is a Stromatolite? -- Stromatolite Biogenicity Criteria -- Mechanisms of Stromatolite Accretion -- Trapping and Binding -- Abiotic Chemical Precipitation -- Biologically Induced Precipitation with a Focus on Chemo- and Phototactic Growth -- Brief Review of Transition from Neoarchaean to Proterozoic Stromatolites: Temporal Context for Palaeoproterozoic Examples from... -- Overview of Stromatolites from the Fennoscandian Shield -- A c. 2100Ma Shallow-Water Onega Carbonate Platform -- the Tulomozero Formation -- Tulomozero Formation Morphotype 1: Spaced Bioherms of Branched, Columnar Stromatolites -- Tulomozero Formation Morphotype 2: Laterally Continuous Biostromes of Branched, Columnar Stromatolites -- Tulomozero Formation Morphotype 3: Flat-Laminated Stromatolites -- Tulomozero Formation Morphotype 4: Columnar Branched Mini-Stromatolites -- Tulomozero Formation Morphotype 5: Non-branching Mini-Columnar Stromatolites -- Tulomozero Formation Morphotype 6: Large Non-branching Columnar Stromatolites -- Tulomozero Formation Morphotype 7: Domed Bioherms Comprising Coalesced Bulbous Stromatolites -- Tulomozero Formation Morphotype 8: Hemispherical Stromatolites -- A c. 2060Ma Rift-Bound Lake System. , the Kuetsjärvi Sedimentary Formation -- Kuetsjärvi Sedimentary Formation Morphotype 1: Stratiform Laminites (Non-columnar Stromatolite) -- Kuetsjärvi Sedimentary Formation Morphotype 2: Club-Like and Subspherical Stromatolite -- Exotic Structures of Argued Microbial Origin -- A c. 2100-2000Ma Rimmed Carbonate Shelf -- the Kalix Greenstone Belt -- Kalix Greenstone Belt Morphotype 1: Parallel-Branching Columnar Stromatolite -- Kalix Greenstone Belt Morphotype 2: Stratiform Laminites -- Kalix Greenstone Belt Morphotype 3: Microcolumnar and Microdigitate Stromatolite -- Kalix Greenstone Belt Morphotype 4: Microspherical Stromatolite -- Kalix Greenstone Belt Morphotype 5: Subspherical to Pillow-Shaped Stromatolite -- Kalix Greenstone Belt Morphotype 6: Hat-Shaped Stromatolite -- Kalix Greenstone Belt Morphotype 7: ``Oversized´´ Spheroidal Stromatolite -- Kalix Greenstone Belt Morphotype 8: Branching and Coalescing Spheroidal Stromatolite -- Kalix Greenstone Belt Morphotype 9: Semispheroidal to Semicolumnar Stromatolite -- Kalix Greenstone Belt Morphotype 10: Solitary Domal and Spheroidal Stromatolites -- On the Biogenicity and Accretion Mechanism of the Fennoscandian Stromatolites -- Significance of Stromatolites from the Lomagundi-Jatuli Interval of Fennoscandia -- Comparison of Stromatolites from Different Depositional Settings -- Stromatolite Biostratigraphy Across the Lomagundi-Jatuli Interval -- Concluding Remarks and Implications for the FAR-DEEP Core -- References -- 7.8.3 Palaeoproterozoic Microfossils -- The Palaeoproterozoic Microfossil Record -- Methods and Problems of Identification of Biogenicity, Endogenicity and Syngenicity -- Introduction -- Raman Spectroscopy -- Transmission Electron Microscopy (TEM) and Analytical TEM (ATEM) -- Secondary Ion Mass Spectrometry (SIMS) -- Synchrotron-Based Techniques (STXM, NEXAFS). , Implication of the FAR-DEEP Cores.
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  • 2
    Schlagwort(e): Geology, Stratigraphic -- Paleozoic -- Soviet Union. ; Electronic books.
    Beschreibung / Inhaltsverzeichnis: This is the second of three volumes that survey the Palaeoproterozoic Eon with a focus on Fennoscandian Shield geology, reviewing early Palaeoproterozoic events coincident with Earth's progressive oxygenation. Includes photos of the FAR-DEEP core collection.
    Materialart: Online-Ressource
    Seiten: 1 online resource (574 pages)
    Ausgabe: 1st ed.
    ISBN: 9783642296598
    Serie: Frontiers in Earth Sciences Series
    DDC: 551.72
    Sprache: Englisch
    Anmerkung: Intro -- Reading the Archive of Earth's Oxygenation -- Volume 2: The Core Archive of the Fennoscandian Arctic Russia - Drilling Early Earth Project -- Dedication -- Contributors to Three-Volume Treatise "Reading the Archive of Earth's Oxygenation", Volume 2: "The Core Archive of the Fennoscandian Arctic Russia: Drilling Early Earth Project" -- Reviewers for Three-Volume Treatise: Reading the Archive of Earth's Oxygenation -- Acknowledgements -- Preface to Volume 2 -- Contents to Volume 1 -- Contents to Volume 2 -- Contents to Volume 3 -- Part V: FAR-DEEP Core Archive and Database -- 5.1 FAR-DEEP Core Archive and Database -- 5.1.1 Drilling Information System and Core Archive -- 5.1.2 FAR-DEEP Samples -- 5.1.3 FAR-DEEP Archive Samples, Dataset and Analytical Methods -- 5.1.3.1 Magnetic Susceptibility Measurements -- 5.1.3.2 Acid-Soluble Major and Trace Element Analysis of Carbonates by ICP-AES -- 5.1.3.3 Major and Trace Element Analysis by XRF -- 5.1.3.4 Carbon and Sulphur Analysis by CS Elemental Analyser -- 5.1.3.5 Carbon and Oxygen Isotope Analyses of Carbonates -- 5.1.3.6 Carbon Isotope Analysis of Organic Carbon -- 5.1.4 FAR-DEEP Information on the Web -- References -- Part VI: FAR-DEEP Core Descriptions and Rock Atlas -- 6.1 The Imandra/Varzuga Greenstone Belt -- 6.1. The Imandra/Varzuga Greenstone Belt -- References -- 6.1.1 Seidorechka Sedimentary Formation: FAR-DEEP Hole 1A and Neighbouring Quarries -- The Kuksha Volcanic Formation -- The Seidorechka Sedimentary Formation -- The Sandstone-Siltstone Member -- The Dolostone Member -- The Quartzite Member -- The Limestone-Shale Member -- The Shale Member -- The Seidorechka Volcanic Formation -- The Depositional Framework -- References -- 6.1.2 Polisarka Sedimentary Formation: FAR-DEEP Hole 3A -- The Seidorechka Volcanic Formation -- The Polisarka Sedimentary Formation -- Limestone Member. , The Greywacke-Diamictite Member -- Igneous Bodies Within the Sedimentary Succession -- The Polisarka Volcanic Formation -- Depositional Framework -- References -- 6.1.3 Umba Sedimentary Formation: FAR-DEEP Hole 4A -- The Umba Sedimentary Formation -- The Sandstone-Siltstone Member -- The Dolostone Member -- The Shale Member -- The Quartzite Member -- Volcanic Units Within the Sedimentary Succession -- The Umba Volcanic Formation -- The Depositional Framework -- References -- 6.1.4. Umba Sedimentary Formation, Sukhoj Section -- Section Description -- Depositional Framework -- References -- 6.2 The Pechenga Greenstone Belt -- 6.2 The Pechenga Greenstone Belt -- References -- 6.2.1 The Neverskrukk Formation: Drillholes 3462, 3463 and Related Outcrops -- The Neverskrukk Formation, Drillhole 3462 -- Conglomerate Unit -- Gritstone Unit -- Gritstone-Conglomerate-Sandstone Unit -- Sandstone Unit -- Conglomerate-Sandstone Unit -- The Neverskrukk Formation, Drillhole 3463 -- The Depositional Framework -- References -- 6.2.2 Kuetsjärvi Sedimentary Formation: FAR-DEEP Hole 5A, Neighbouring Quarry and Related Outcrops -- The Ahmalahti Volcanic Formation (Unit A) -- The Kuetsjärvi Sedimentary Formation -- The Arkosic Member -- The Lower Dolostone Member -- The Quartzite Member -- The Upper Dolostone Member -- Igneous Bodies Within the Sedimentary Succession: Ferropicrite (Unit B) -- The Kuetsjärvi Volcanic Formation (Unit C) -- Depositional Framework -- References -- 6.2.3 Kuetsjärvi Volcanic Formation: FAR-DEEP Hole 6A and Related Outcrops -- Andesite-Rhyolite Member -- Unit A -- Unit B -- Unit C -- Unit D -- Unit E -- Unit F -- Unit G -- Conglomerate Member -- Basalt Member -- Unit H -- Depositional Framework -- References -- 6.2.4 Kolosjoki Sedimentary and Kuetsjärvi Volcanic Formations: FAR-DEEP Hole 7A -- The Kuetsjärvi Volcanic Formation. , The Kolosjoki Sedimentary Formation -- The Lower Greywacke Member -- The Gritstone Member -- The Depositional Framework -- References -- 6.2.5 Kolosjoki Sedimentary Formation: FAR-DEEP Holes 8A and 8B and Related Outcrops -- The Kuetsjärvi Volcanic Formation -- The Kolosjoki Sedimentary Formation -- The Sandstone Member -- The Lower Greywacke Member -- The Gritstone Member -- The Haematite Member -- The Ferropicrite Member -- The Dolostone Member -- The Upper Greywacke Member -- The Depositional Framework -- References -- 6.2.6 Kolosjoki Volcanic Formation: FAR-DEEP Hole 9A -- Volcanic Rocks -- Sedimentary Rocks -- Depositional Setting -- References -- 6.3 The Onega Basin -- 6.3. The Onega Basin -- References -- 6.3.1 Tulomozero Formation: FAR-DEEP Holes 10A and 10B -- Hole 10A -- Member 1 (Lower Dolostone) -- Member 2 (Siltstone-Sandstone-Breccia) -- Member 3 (Dolostone-Dolomarl) -- Member 4 (Dolomarl) -- Member 5 (Siltstone-Dissolution Breccia-Magnesite) -- Member 6 (Dolomarl-Dolostone-Siltstone-Sandstone) -- Member 7 (Sandstone-Dolostone) -- Member 8 (Siltstone-Sandstone) -- Member 9 (Dolostone-Sandstone-Dolomarl) -- Hole 10B -- Member 10 (Dolostone-Conglomerate) -- Member 11 (Sandstone-Basalt) -- Member 12 (Siltstone) -- Member 13 (Upper Dolostone) -- Member 14 (Nodular Shale-Siltstone-Marl-Breccia) -- Member 15 (Shale-Dissolution Breccia) -- Depositional Settings Based on Core 10A and 10B Logs -- References -- 6.3.2 Tulomozero Formation: FAR-DEEP Hole 11A -- The Tulomozero Formation -- Member 1 (Dolostone-Siltstone-Shale) -- Member 2 (Sandstone-Siltstone-Shale-Dissolution Breccia) -- Member 3 (Lower Dolostone) -- Member 4 (Siltstone-Shale-Basalt) -- Member 5 (Dolostone-Dissolution Breccia) -- Member 6 (Conglomerate) -- Member 7 (Upper Dolostone) -- The Zaonega Formation -- Member 1 (Sandstone-Siltstone-Dolomarl) -- Member 2 (Siltstone). , Depositional Settings -- References -- 6.3.3 Zaonega Formation: FAR-DEEP Holes 12A and 12B, and Neighbouring Quarries -- The Zaonega Formation -- The Greywacke Member -- The Dolostone-Greywacke Member -- The Mudstone-Limestone Member -- The Dolostone-Chert Member -- Magmatic Units -- Depositional Environment and Postdepositional Alteration -- References -- 6.3.4 Zaonega Formation: FAR-DEEP Hole 13A -- The Zaonega Formation -- The Siliciclastic-Carbonate Member -- The Dolostone-Chert Member -- Magmatic Units -- Correlation of Holes 12AB and 13A -- Depositional Environment and Postdepositional Alterations -- References.
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  • 3
    Schlagwort(e): Geology, Stratigraphic -- Paleozoic -- Baltic Shield. ; Electronic books.
    Beschreibung / Inhaltsverzeichnis: This is the first of three volumes that survey the Palaeoproterozoic Eon with a focus on Fennoscandian Shield geology, reviewing early Palaeoproterozoic events coincident with Earth's progressive oxygenation. Includes photos of the FAR-DEEP core collection.
    Materialart: Online-Ressource
    Seiten: 1 online resource (502 pages)
    Ausgabe: 1st ed.
    ISBN: 9783642296826
    Serie: Frontiers in Earth Sciences Series
    DDC: 551.72
    Sprache: Englisch
    Anmerkung: Intro -- Reading the Archive of Earth's Oxygenation -- Volume 1: The Palaeoproterozoic of Fennoscandia as Context for the Fennoscandian Arctic Russia - Drilling Early Earth Project -- Dedication -- Contributors to Three-Volume Treatise Readingthe Archive of Earth's Oxygenation,Volume 1: The Palaeoproterozoic of Fennoscandiaas Context for the FennoscandianArctic Russia - Drilling Early Earth Project -- Reviewers for Three-Volume Treatise:Reading the Archive of Earth's Oxygenation -- Acknowledgements -- Preface to Volume 1 -- Contents to Volume 1 -- Contents to Volume 2 -- Contents to Volume 3 -- Part I: Palaeoproterozoic Earth -- 1.1 Tectonic Evolution and Major Global Earth-Surface Palaeoenvironmental Events in the Palaeoproterozoic -- 1.1.1 Late Archaean Tectonic Restructuring -- Palaeogeography -- 1.1.2 Newly Born Supercontinent(s) Through 2.4-c. 2.3Ga Time Interval -- Global Magmatic Shut- or Slow-Down -- Global Glaciation and Oxygenation of Atmosphere -- 1.1.3 Rifted Supercontinent(s) Through c. 2.3-2.1Ga -- Formation of Giant Manganese Deposits and World-Wide ``Red Beds´´ -- One of the Greatest Perturbations of the Global Carbon Cycle: The Lomagundi-Jatuli Isotopic Event -- Upper Mantle Oxidising Event -- Radical Change of Seawater Sulphate Reservoir -- 1.1.4 Dispersed Kenorland Supercontinent Through 2.1-1.9Ga -- Enhanced Gglobal Accumulation of Organic Matter: The Shunga Event, and Giant Iron-Ore Deposits -- The Earliest Phosphorites: A Radical Change in the Phosphorous Cycle -- Establishment of an Aerobic Pathway in Recycling of Organic Matter -- 1.1.5 Summary -- References -- Part II: The Fennoscandian Arctic Russia: Drilling Early Earth Project (FAR-DEEP) -- 2.1 The International Continental Scientific Drilling Program -- 2.1.2 Fennoscandian Arctic Russia-Drilling Early Earth Project (FAR-DEEP). , Motivation and Goals of Drilling Project -- Scientific Background for Implementation of the Drilling Project -- Implementation of the Scientific Drilling Project -- References -- Part III: Fennoscandia: The First 500 Million Years of the Palaeoproterozoic -- 3.1 The Early Palaeoproterozoic of Fennoscandia: Geological and Tectonic Settings -- References -- 3.2 Litho- and Chronostratigraphy of the Palaeoproterozoic Karelian Formations -- 3.2.1 Lithostratigraphic Framework -- 3.2.2 Event Stratigraphy and Age Constraints -- 3.2.3 The Sumian System, 2505-2430Ma -- 3.2.4 The Sariolian System, 2430-2300Ma -- 3.2.5 The Jatulian System, 2300-2060Ma -- 3.2.6 The Ludicovian System, 2060-1960Ma -- 3.2.7 The Kalevian System, 1960-1900Ma -- 3.2.8 Post-Karelian, Postorogenic Supracrustal Rocks -- 3.2.9 Global Implications of the Event-Based Fennoscandian Chronostratigraphy -- References -- 3.3 Palaeotectonic and Palaeogeographic Evolution of Fennoscandia in the Early Palaeoproterozoic -- 3.3.1 Pre-Sumian Time -- 3.3.2 2505-2430Ma Period -- 3.3.3 2430-2300Ma Period -- 3.3.4 2300-2060Ma Period -- 3.3.5 2060-1950Ma Period -- 3.3.6 1950-1900Ma Period -- 3.3.7 1900-1850Ma Period -- 3.3.8 Summary -- References -- 3.4 Evolution of the Palaeoproterozoic (2.50-1.95Ga) Non-orogenic Magmatism in the Eastern Part of the Fennoscandian Shield -- 3.4.1 Introduction -- 3.4.2 Sumian Magmatism -- 3.4.3 Sariolian Magmatism -- 3.4.4 Jatulian Magmatism -- 3.4.5 Ludicovian Magmatism -- 3.4.6 Kalevian Magmatism -- 3.4.7 Post-Ludicovian Allochthonous Units -- 3.4.8 Orogenic Magmatism in the Kola Peninsula -- 3.4.9 Nd Isotope Evolution -- 3.4.10 Oxidation State of Iron -- 3.4.11 Discussion -- References -- Part IV: Geology of the Drilling Sites -- 4.1 The Imandra/Varzuga Greenstone Belt -- 4.1.1 Introduction -- 4.1.2 General Geological Features -- 4.1.3 Stratigraphic Subdivision and Age. , The Strel´na Group -- The Purnach Formation -- The Kuksha Sedimentary Formation -- The Kuksha Volcanic Formation -- The Seidorechka Sedimentary Formation -- The Seidorechka Volcanic Formation -- The Varzuga Group -- The Polisarka Sedimentary Formation -- The Polisarka Volcanic Formation -- The Umba Sedimentary Formation -- The Umba Volcanic Formation -- The Il´mozero Sedimentary Formation -- The Il´mozero Volcanic Formation -- The Tominga Group -- References -- 4.2 The Pechenga Greenstone Belt -- 4.2.1 Introduction -- 4.2.2 General Geological Features -- 4.2.3 Stratigraphic Subdivision and Age -- The North Pechenga Group -- The Neverskrukk Formation -- The Ahmalahti Formation -- The Kuetsjärvi Sedimentary Formation -- The Kuetsjärvi Volcanic Formation -- The Kolosjoki Sedimentary Formation -- The Kolosjoki Volcanic Formation -- Pilgujärvi Sedimentary Formation -- Pilgujärvi Volcanic Formation -- The South Pechenga Group -- References -- 4.3 The Onega Basin -- 4.3.1 Introduction -- 4.3.2 General Geological Features -- 4.3.3 Stratigraphic Subdivision and Age -- The Sumian Super-Horizon -- The Glubokozero Formation -- The Kumsa Formation -- The Sariolian Super-Horizon -- The Paljeozero Formation -- The Jatulian Super-Horizon -- The Jangozero Formation -- The Medvezhegorsk/Koikary Formation -- The Tulomozero Formation -- The Ludicovian Super-Horizon -- The Zaonega Formation -- The Suisari Formation -- The Kalevian Super-Horizon -- The Kondopoga Formation -- The Vashozero Formation -- References.
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  • 4
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The evolution of the Earth’s atmosphere is marked by a transition from an early atmosphere with very low oxygen content to one with an oxygen content within a few per cent of the present atmospheric level. Placing time constraints on this transition is of interest because it identifies ...
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 359 (1992), S. 605-609 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The oxidation of the Earth's crust and the increase in atmospheric oxygen early in Earth history have been linked to the accumulation of reduced carbon in sedimentary rocks. Trends in the carbon isotope composition of sedimentary organic carbon and carbonate show that during the Proterozoic aeon ...
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 362 (1993), S. 118-118 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] DES MARAIS ET AL. REPLY — We summarized the evidence that 〈 5org increased and that net isotope discrimination (〈 5carb - 〈 5org) decreased substantially during the Proterozoic1 (see figure left). These trends, which emerge from 〈 5carb and 〈 5org data obtained by several ...
    Materialart: Digitale Medien
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  • 7
    ISSN: 1432-1165
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geologie und Paläontologie
    Beschreibung / Inhaltsverzeichnis: Abstract Combined hydrochemical, geochemical and isotopic investigations of solid and dissolved sulphur- and carbon-species from different aquifer levels allow to distinguish two geochemical cycles: The first one is represented by the sedimentary pyrites which have been formed during the Tertiary by bacterial sulplate reduction. These pyrites are characterized by strongly depleted δ 14 S-signatures. In accordance with a recent origin, the groundwater composition reflects the current sulphur- and carbon-cycling representing the second one. The activity of sulphate reducing bacterian can be deduced from a decrease of the sulphate concentration with depth and a simultaneous increase in δ 14 S- and δ 18 O-values as well as increasing hydrogen sulphide concentrations. Dissolved organic carbon, the substrate and electron-donor for the bacterial sulphate reduction, appears to be the limiting factor as its average concentration reaches only 1.6 mg/l. The concentration of dissolved inorganic carbon is slightly higher in the deeper groundwater levels. Due to its clearly negative carbon-isotope signature it can be identified as a product of biogenic oxidation of organic material.
    Notizen: Kurzfassung Durch den kombinierten Einsatz von isotopengeochemischen und hydrochemischen Untersuchungsmethoden an Sedimenten und Grundwässern der Niederrheinischen Bucht können die in den Aquiferen vorhandenen festen und gelösten Schwefel- und Kohlenstoff-Verbindungen zwei zeitlich getrennten Stoffkreisläufen zugeordnet werden. Während die sedimentären Pyrite, die dominierende Schwefelverbindung innerhalb der marinen Sande, durchschnittlich stark an 34 S verarmt sind und bereits im Tertiär gebildet wurden, läßt sich aus den gelösten Wasserinhaltsstoffen der jungen Grundwässer auf den rezenten Schwefel- und Kohlenstoff-Kreislauf schließen. In den unteren anaeroben Grundwasserstockwerken der durch Braunkohleeinschaltungen gegliederten Sande kann die Aktivität sulfatreduzierter Bakterien durch die Abnahme der Sulfatkonzentration bei gleichzeitigem Anstieg der zugehörigen δ 14 S- und δ 18 O-Werte im Sinne einer Rayleigh-Fraktionierung sowie durch erhöhte Schwefelwasserstoffkonzentration belegt werden. Gelöster organischer Kohlenstoff, der als Elektronendonator für die bakterielle Sulfatreduktion dient, ist mit durchschnittlich 1,6 mg/l vermutlich der limitierende Faktor dieses Prozesses. Gelöster anorganischer Kohlenstoff tritt in den tieferen Grundwasserstockwerken in leicht erhöhten Konzentrationen auf und kann aufgrund seiner deutlich negativ Kohlenstoff-Isotopensignatur als Produkt der Oxidation organischer Substanz identifiziert werden.
    Materialart: Digitale Medien
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  • 8
    facet.materialart.
    Unbekannt
    Elsevier
    In:  Earth and Planetary Science Letters, 489 . pp. 1-7.
    Publikationsdatum: 2021-02-08
    Beschreibung: Highlights • The genetic model for Algoma-type BIF is modified taking into account S-MIF results. • Metal and sulfur sources are decoupled and reflect diverse microbial metabolisms. • Sulfur deposited with oxide-facies BIF is mostly atmospheric in origin. • Little juvenile sulfur is found, despite the proximity to volcanic sources. Abstract Neoarchean Algoma-type banded iron formations (BIFs) are widely viewed as direct chemical precipitates from proximal volcanic–hydrothermal vents. However, a systematic multiple sulfur isotope study of oxide-facies BIF from a type locality in the ca. 2.74 Ga Temagami greenstone belt reveals mainly bacterial turnover of atmospheric elemental sulfur in the host basin rather than deposition of hydrothermally cycled seawater sulfate or sulfur from direct volcanic input. Trace amounts of chromium reducible sulfur that were extracted for quadruple sulfur isotope (32S–33S–34S–36S) analysis record the previously known mass-independent fractionation of volcanic SO2 in the Archean atmosphere (S-MIF) and biological sulfur cycling but only minor contributions from juvenile sulfur, despite the proximity of volcanic sources. We show that the dominant bacterial metabolisms were iron reduction and sulfur disproportionation, and not sulfate reduction, consistent with limited availability of organic matter and the abundant ferric iron deposited as Fe(OH)3. That sulfur contained in the BIF was not a direct volcanic–hydrothermal input, as expected, changes the view of an important archive of the Neoarchean sulfur cycle in which the available sulfur pools were strongly decoupled and only species produced photochemically under anoxic atmospheric conditions were deposited in the BIF-forming environment.
    Materialart: Article , PeerReviewed
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    Format: text
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  • 9
    Publikationsdatum: 2021-02-08
    Beschreibung: Elemental sulfur is commonly regarded as the product of oxidative sulfur cycling in the sediment. However, reports on the occurrence of elemental sulfur in seepage areas are few and thus its origin and mechanisms controlling its distribution are insufficiently understood. Here, we analyzed the multiple sulfur isotopic compositions for elemental sulfur and pyrite from an iron-dominated gas hydrate-bearing sedimentary environment of the South China Sea to unravel the impact of sulfate-driven anaerobic oxidation of methane (SO4-AOM) on the formation of elemental sulfur. The multiple sulfur isotopes reveal variable ranges for both elemental sulfur and pyrite (δ34S: between −15.7 and +23.3‰ for elemental sulfur and between −35.3 and +34.4‰ for pyrite; Δ33S: between −0.08 and +0.06‰ for elemental sulfur and between −0.03 and +0.15‰ for pyrite). The enrichment of 34S in pyrite throughout the sediment core suggests pronounced SO4-AOM in paleo-sulfate-methane transition zones (SMTZ). In addition, the occurrence of seep carbonates with very negative δ13C values (as low as −57‰, V-PDB) coincides with the inferred paleo-SMTZs and agrees with formerly locally pronounced SO4-AOM. Interestingly, the multiple sulfur isotopic composition of elemental sulfur reveals a different pattern from that of pyrite derived from organoclastic sulfate reduction (i.e., with low δ34S and high Δ33S values for the latter). In comparison to coexisting pyrite, most of the elemental sulfur reveals higher δ34S values (as much as +28.9‰), which is best explained by an enrichment of 34S in the residual pool of dissolved sulfide generated by SO4-AOM. As an intermediate sulfur phase, elemental sulfur can form via sulfide oxidation coupled to iron reduction, but it can only persist in the absence of free sulfide. Therefore, the occurrence of 34S enriched elemental sulfur is likely to represent an oxidative product after hydrogen sulfide had vanished due to vertical displacement of the SMTZ. Our observations suggest that elemental sulfur may serve as a useful recorder for reconstructing the dynamics of sulfur cycling in modern and possibly ancient seepage areas.
    Materialart: Article , PeerReviewed
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  • 10
    Publikationsdatum: 2021-02-08
    Beschreibung: The earliest diagenetic post-mortem exposure of biogenic carbonates at the sea floor and in the uppermost sediment column results in the colonization of hard-part surfaces by bacterial communities. Some of the metabolic redox processes related to these communities have the potential to alter carbonate shell properties, and hence affect earliest diagenetic pathways with significant consequences for archive data. During a three-month in vitro study, shell subsamples of the ocean quahog Arctica islandica (Linnaeus, 1767) were incubated in natural anoxic sediment slurries and bacterial culture medium of the heterotrophic Shewanella sediminisHAW-EB3. Bulk analyses of the liquid media from the Shewanella sediminis incubation revealed an over ten-fold increase in total alkalinity, dissolved inorganic carbon and ΩAragonite, and the alteration of the Mg/Ca, Mg/Sr and Sr/Ca ratios relative to control incubations without cultures. Ion ratios were most affected in the incubation with anoxic sediment, depicting a 25% decrease in Mg/Ca relative to the control. Shell sample surfaces that were exposed to both incubations displayed visible surface dissolution features, and an 8 wt% loss in calcium content. No such alteration features were detected in control shells. Apparently, alteration of shell carbonate properties was induced by microbially driven decomposition of shell intercrystalline organic constituents and subsequent opening of pathways for pore fluid-crystal exchange. This study illustrates the potential influence of benthic bacterial metabolism on biogenic carbonate archives during the initial stages of diagenetic alteration within a relatively short experimental duration of only three months. These results suggest that foremost the biological effect of bacterial cation adsorption on divalent cation ratios has the potential to complicate proxy interpretation. Results shown here highlight the necessity to consider bacterial metabolic activities in marine sediments for the interpretation of palaeo-environmental proxies from shell carbonate archives.
    Materialart: Article , PeerReviewed
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