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  • 1
    Publication Date: 2010-10-29
    Description: Phosphorus is a biolimiting nutrient that has an important role in regulating the burial of organic matter and the redox state of the ocean-atmosphere system. The ratio of phosphorus to iron in iron-oxide-rich sedimentary rocks can be used to track dissolved phosphate concentrations if the dissolved silica concentration of sea water is estimated. Here we present iron and phosphorus concentration ratios from distal hydrothermal sediments and iron formations through time to study the evolution of the marine phosphate reservoir. The data suggest that phosphate concentrations have been relatively constant over the Phanerozoic eon, the past 542 million years (Myr) of Earth's history. In contrast, phosphate concentrations seem to have been elevated in Precambrian oceans. Specifically, there is a peak in phosphorus-to-iron ratios in Neoproterozoic iron formations dating from approximately 750 to approximately 635 Myr ago, indicating unusually high dissolved phosphate concentrations in the aftermath of widespread, low-latitude 'snowball Earth' glaciations. An enhanced postglacial phosphate flux would have caused high rates of primary productivity and organic carbon burial and a transition to more oxidizing conditions in the ocean and atmosphere. The snowball Earth glaciations and Neoproterozoic oxidation are both suggested as triggers for the evolution and radiation of metazoans. We propose that these two factors are intimately linked; a glacially induced nutrient surplus could have led to an increase in atmospheric oxygen, paving the way for the rise of metazoan life.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Planavsky, Noah J -- Rouxel, Olivier J -- Bekker, Andrey -- Lalonde, Stefan V -- Konhauser, Kurt O -- Reinhard, Christopher T -- Lyons, Timothy W -- England -- Nature. 2010 Oct 28;467(7319):1088-90. doi: 10.1038/nature09485.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth Sciences, University of California, Riverside, California 92521, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20981096" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aquatic Organisms/*metabolism ; Atmosphere/chemistry ; *Biological Evolution ; Ferric Compounds/analysis/metabolism ; Geologic Sediments/chemistry ; History, Ancient ; Ice Cover ; Iron/analysis/metabolism ; Marine Biology ; Oceans and Seas ; Oxidation-Reduction ; Oxygen/analysis/metabolism ; Phosphates/analysis/*metabolism ; Phosphorus/analysis/metabolism ; Seawater/chemistry ; Silicon Dioxide/analysis/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2009-09-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lyons, Timothy W -- Reinhard, Christopher T -- England -- Nature. 2009 Sep 10;461(7261):179-81. doi: 10.1038/461179a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Timothy W. Lyons and Christopher T. Reinhard are in the Department of Earth Sciences, University of California, Riverside, California 92521, USA. timothy.lyons@ucr.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19741692" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atmosphere/*chemistry ; Bacteria/metabolism ; Chromium/*analysis/chemistry ; Chromium Isotopes ; History, Ancient ; Iron/analysis ; Manganese Compounds/metabolism ; Oxidation-Reduction ; Oxides/metabolism ; Oxygen/*analysis/*metabolism ; Seawater/chemistry
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2007-09-29
    Description: High-resolution chemostratigraphy reveals an episode of enrichment of the redox-sensitive transition metals molybdenum and rhenium in the late Archean Mount McRae Shale in Western Australia. Correlations with organic carbon indicate that these metals were derived from contemporaneous seawater. Rhenium/osmium geochronology demonstrates that the enrichment is a primary sedimentary feature dating to 2501 +/- 8 million years ago (Ma). Molybdenum and rhenium were probably supplied to Archean oceans by oxidative weathering of crustal sulfide minerals. These findings point to the presence of small amounts of O2 in the environment more than 50 million years before the start of the Great Oxidation Event.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anbar, Ariel D -- Duan, Yun -- Lyons, Timothy W -- Arnold, Gail L -- Kendall, Brian -- Creaser, Robert A -- Kaufman, Alan J -- Gordon, Gwyneth W -- Scott, Clinton -- Garvin, Jessica -- Buick, Roger -- New York, N.Y. -- Science. 2007 Sep 28;317(5846):1903-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA. anbar@asu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17901330" target="_blank"〉PubMed〈/a〉
    Keywords: Australia ; Geologic Sediments/*chemistry ; Isotopes/analysis ; Molybdenum/analysis ; Oceans and Seas ; Osmium/analysis ; Oxidation-Reduction ; *Oxygen/analysis ; Rhenium/analysis ; Seawater/chemistry ; Sulfur/analysis ; Sulfur Isotopes/analysis ; Temperature ; Uranium/analysis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2010-02-13
    Description: The Ediacaran Period (635 to 542 million years ago) was a time of fundamental environmental and evolutionary change, culminating in the first appearance of macroscopic animals. Here, we present a detailed spatial and temporal record of Ediacaran ocean chemistry for the Doushantuo Formation in the Nanhua Basin, South China. We find evidence for a metastable zone of euxinic (anoxic and sulfidic) waters impinging on the continental shelf and sandwiched within ferruginous [Fe(II)-enriched] deep waters. A stratified ocean with coeval oxic, sulfidic, and ferruginous zones, favored by overall low oceanic sulfate concentrations, was maintained dynamically throughout the Ediacaran Period. Our model reconciles seemingly conflicting geochemical redox conditions proposed previously for Ediacaran deep oceans and helps to explain the patchy temporal record of early metazoan fossils.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Chao -- Love, Gordon D -- Lyons, Timothy W -- Fike, David A -- Sessions, Alex L -- Chu, Xuelei -- New York, N.Y. -- Science. 2010 Apr 2;328(5974):80-3. doi: 10.1126/science.1182369. Epub 2010 Feb 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth Sciences, University of California, Riverside, CA 92521, USA. chaoli@ucr.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20150442" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Carbonates/analysis ; China ; Ferrous Compounds/analysis ; *Fossils ; Geologic Sediments/*chemistry ; Hydrogen Sulfide ; Iron ; Oceans and Seas ; Oxidation-Reduction ; Oxygen/*analysis ; Seawater/*chemistry ; Sulfates/analysis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 2005-12-03
    Description: The environmental expression of sulfur compound disproportionation has been placed between 640 and 1050 million years ago (Ma) and linked to increases in atmospheric oxygen. These arguments have their basis in temporal changes in the magnitude of 34S/32S fractionations between sulfate and sulfide. Here, we present a Proterozoic seawater sulfate isotope record that includes the less abundant sulfur isotope 33S. These measurements imply that sulfur compound disproportionation was an active part of the sulfur cycle by 1300 Ma and that progressive Earth surface oxygenation may have characterized the Mesoproterozoic.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Johnston, David T -- Wing, Boswell A -- Farquhar, James -- Kaufman, Alan J -- Strauss, Harald -- Lyons, Timothy W -- Kah, Linda C -- Canfield, Donald E -- New York, N.Y. -- Science. 2005 Dec 2;310(5753):1477-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA. dtj@geol.umd.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16322453" target="_blank"〉PubMed〈/a〉
    Keywords: *Environment ; Eukaryotic Cells/metabolism ; Evolution, Planetary ; Geologic Sediments ; Oxidation-Reduction ; Oxygen ; *Prokaryotic Cells/metabolism ; Seawater ; *Sulfur/metabolism ; Sulfur Isotopes
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 2011-01-07
    Description: Widespread anoxia in the ocean is frequently invoked as a primary driver of mass extinction as well as a long-term inhibitor of evolutionary radiation on early Earth. In recent biogeochemical studies it has been hypothesized that oxygen deficiency was widespread in subsurface water masses of later Cambrian oceans, possibly influencing evolutionary events during this time. Physical evidence of widespread anoxia in Cambrian oceans has remained elusive and thus its potential relationship to the palaeontological record remains largely unexplored. Here we present sulphur isotope records from six globally distributed stratigraphic sections of later Cambrian marine rocks (about 499 million years old). We find a positive sulphur isotope excursion in phase with the Steptoean Positive Carbon Isotope Excursion (SPICE), a large and rapid excursion in the marine carbon isotope record, which is thought to be indicative of a global carbon cycle perturbation. Numerical box modelling of the paired carbon sulphur isotope data indicates that these isotope shifts reflect transient increases in the burial of organic carbon and pyrite sulphur in sediments deposited under large-scale anoxic and sulphidic (euxinic) conditions. Independently, molybdenum abundances in a coeval black shale point convincingly to the transient spread of anoxia. These results identify the SPICE interval as the best characterized ocean anoxic event in the pre-Mesozoic ocean and an extreme example of oxygen deficiency in the later Cambrian ocean. Thus, a redox structure similar to those in Proterozoic oceans may have persisted or returned in the oceans of the early Phanerozoic eon. Indeed, the environmental challenges presented by widespread anoxia may have been a prevalent if not dominant influence on animal evolution in Cambrian oceans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gill, Benjamin C -- Lyons, Timothy W -- Young, Seth A -- Kump, Lee R -- Knoll, Andrew H -- Saltzman, Matthew R -- England -- Nature. 2011 Jan 6;469(7328):80-3. doi: 10.1038/nature09700.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth Sciences, University of California, 900 University Avenue, Riverside, California 92521, USA. bgill@fas.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21209662" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Evolution ; Carbon Cycle ; Carbon Isotopes/analysis ; Carbonates/analysis ; Extinction, Biological ; Fossils ; Geologic Sediments/*chemistry ; History, Ancient ; Iron/analysis/chemistry ; Molybdenum/analysis/chemistry ; Oceans and Seas ; Oxidation-Reduction ; Oxygen/*analysis ; Seawater/*chemistry ; Sulfides/*analysis/chemistry ; Sulfur Isotopes/analysis ; Sweden
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 2012-09-29
    Description: Metazoans are likely to have their roots in the Cryogenian period, but there is a marked increase in the appearance of novel animal and algae fossils shortly after the termination of the late Cryogenian (Marinoan) glaciation about 635 million years ago. It has been suggested that an oxygenation event in the wake of the severe Marinoan glaciation was the driving factor behind this early diversification of metazoans and the shift in ecosystem complexity. But there is little evidence for an increase in oceanic or atmospheric oxygen following the Marinoan glaciation, or for a direct link between early animal evolution and redox conditions in general. Models linking trends in early biological evolution to shifts in Earth system processes thus remain controversial. Here we report geochemical data from early Ediacaran organic-rich black shales ( approximately 635-630 million years old) of the basal Doushantuo Formation in South China. High enrichments of molybdenum and vanadium and low pyrite sulphur isotope values (Delta(34)S values 〉/=65 per mil) in these shales record expansion of the oceanic inventory of redox-sensitive metals and the growth of the marine sulphate reservoir in response to a widely oxygenated ocean. The data provide evidence for an early Ediacaran oxygenation event, which pre-dates the previous estimates for post-Marinoan oxygenation by more than 50 million years. Our findings seem to support a link between the most severe glaciations in Earth's history, the oxygenation of the Earth's surface environments, and the earliest diversification of animals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sahoo, Swapan K -- Planavsky, Noah J -- Kendall, Brian -- Wang, Xinqiang -- Shi, Xiaoying -- Scott, Clint -- Anbar, Ariel D -- Lyons, Timothy W -- Jiang, Ganqing -- England -- Nature. 2012 Sep 27;489(7417):546-9. doi: 10.1038/nature11445.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geoscience, University of Nevada, Las Vegas, Nevada 89154, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23018964" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atmosphere/chemistry ; Biodiversity ; *Biological Evolution ; China ; Fossils ; Geologic Sediments/chemistry ; History, Ancient ; *Ice Cover ; Iron/analysis/chemistry ; Molybdenum/analysis ; Oceans and Seas ; Oxidation-Reduction ; Oxygen/*analysis/metabolism ; Seawater/*chemistry ; Sulfides/analysis/chemistry ; Sulfur Isotopes ; Trace Elements/analysis/chemistry ; Vanadium/analysis
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2013-04-26
    Description: The accumulation of substantial quantities of O2 in the atmosphere has come to control the chemistry and ecological structure of Earth's surface. Non-mass-dependent (NMD) sulphur isotope anomalies in the rock record are the central tool used to reconstruct the redox history of the early atmosphere. The generation and initial delivery of these anomalies to marine sediments requires low partial pressures of atmospheric O2 (p(O2); refs 2, 3), and the disappearance of NMD anomalies from the rock record 2.32 billion years ago is thought to have signalled a departure from persistently low atmospheric oxygen levels (less than about 10(-5) times the present atmospheric level) during approximately the first two billion years of Earth's history. Here we present a model study designed to describe the long-term surface recycling of crustal NMD anomalies, and show that the record of this geochemical signal is likely to display a 'crustal memory effect' following increases in atmospheric p(O2) above this threshold. Once NMD anomalies have been buried in the upper crust they are extremely resistant to removal, and can be erased only through successive cycles of weathering, dilution and burial on an oxygenated Earth surface. This recycling results in the residual incorporation of NMD anomalies into the sedimentary record long after synchronous atmospheric generation of the isotopic signal has ceased, with dynamic and measurable signals probably surviving for as long as 10-100 million years subsequent to an increase in atmospheric p(O2) to more than 10(-5) times the present atmospheric level. Our results can reconcile geochemical evidence for oxygen production and transient accumulation with the maintenance of NMD anomalies on the early Earth, and suggest that future work should investigate the notion that temporally continuous generation of new NMD sulphur isotope anomalies in the atmosphere was likely to have ceased long before their ultimate disappearance from the rock record.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reinhard, Christopher T -- Planavsky, Noah J -- Lyons, Timothy W -- England -- Nature. 2013 May 2;497(7447):100-3. doi: 10.1038/nature12021. Epub 2013 Apr 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91126, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23615613" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere/chemistry ; Ecosystem ; Geologic Sediments/*chemistry ; History, Ancient ; Oceans and Seas ; Oxidation-Reduction ; Oxygen/analysis ; Sulfur Isotopes/*analysis/chemistry ; Time Factors
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 2007-09-29
    Description: High-resolution geochemical analyses of organic-rich shale and carbonate through the 2500 million-year-old Mount McRae Shale in the Hamersley Basin of northwestern Australia record changes in both the oxidation state of the surface ocean and the atmospheric composition. The Mount McRae record of sulfur isotopes captures the widespread and possibly permanent activation of the oxidative sulfur cycle for perhaps the first time in Earth's history. The correlation of the time-series sulfur isotope signals in northwestern Australia with equivalent strata from South Africa suggests that changes in the exogenic sulfur cycle recorded in marine sediments were global in scope and were linked to atmospheric evolution. The data suggest that oxygenation of the surface ocean preceded pervasive and persistent atmospheric oxygenation by 50 million years or more.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaufman, Alan J -- Johnston, David T -- Farquhar, James -- Masterson, Andrew L -- Lyons, Timothy W -- Bates, Steve -- Anbar, Ariel D -- Arnold, Gail L -- Garvin, Jessica -- Buick, Roger -- New York, N.Y. -- Science. 2007 Sep 28;317(5846):1900-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departments of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742-4211, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17901329" target="_blank"〉PubMed〈/a〉
    Keywords: *Atmosphere ; Australia ; Bacteria/metabolism ; Geologic Sediments/*chemistry/microbiology ; Oxidation-Reduction ; *Oxygen ; Seawater ; South Africa ; Sulfates/chemistry/metabolism ; *Sulfur/chemistry/metabolism ; Sulfur Isotopes/analysis ; Time
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2014-11-02
    Description: The oxygenation of Earth's surface fundamentally altered global biogeochemical cycles and ultimately paved the way for the rise of metazoans at the end of the Proterozoic. However, current estimates for atmospheric oxygen (O2) levels during the billion years leading up to this time vary widely. On the basis of chromium (Cr) isotope data from a suite of Proterozoic sediments from China, Australia, and North America, interpreted in the context of data from similar depositional environments from Phanerozoic time, we find evidence for inhibited oxidation of Cr at Earth's surface in the mid-Proterozoic (1.8 to 0.8 billion years ago). These data suggest that atmospheric O2 levels were at most 0.1% of present atmospheric levels. Direct evidence for such low O2 concentrations in the Proterozoic helps explain the late emergence and diversification of metazoans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Planavsky, Noah J -- Reinhard, Christopher T -- Wang, Xiangli -- Thomson, Danielle -- McGoldrick, Peter -- Rainbird, Robert H -- Johnson, Thomas -- Fischer, Woodward W -- Lyons, Timothy W -- New York, N.Y. -- Science. 2014 Oct 31;346(6209):635-8. doi: 10.1126/science.1258410.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department Geology and Geophysics, Yale University, CT, USA. noah.planavsky@yale.edu chris.reinhard@eas.gatech.edu. ; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, GA, USA. noah.planavsky@yale.edu chris.reinhard@eas.gatech.edu. ; Department Geology and Geophysics, Yale University, CT, USA. Department of Geology, University of Illinois, Champaign, IL, USA. ; Department of Earth Science, Carleton University, Ottawa, ON, Canada. ; Centre for Ore Deposit and Exploration Science, University of Tasmania, TAS, Australia. ; Geological Survey of Canada, Ottawa, ON, Canada. ; Department of Geology, University of Illinois, Champaign, IL, USA. ; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA. ; Department of Earth Sciences, University of California, Riverside, CA, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25359975" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atmosphere/*chemistry ; *Biological Evolution ; Chromium Isotopes/chemistry ; Earth (Planet) ; Geologic Sediments/chemistry ; Oxidation-Reduction ; Oxygen/*analysis ; Paleontology
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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