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  • 1
    Monograph available for loan
    Monograph available for loan
    Radiogenic isotope geochemistry of sedimentary and aquatic systems : with 14 tables (1997)
    Berlin [u.a.] : Springer
    Associated volumes
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    Call number: AWI G6-98-0207
    In: Lecture notes in earth sciences
    Description / Table of Contents: Table of Contents: 1 Introduction and basic principles of isotope geochemistry. - 2 Weathering. - 3 Isotope geochemistry of river water. - 4 Isotope geochemistry in the environment. - 5 Isotopic composition of seawater past and and present (Sr, Nd, Pb, Os, Ce). - 6 Isotope geochemistry of detrital and authigenic clay minerals in marine sediments (RB-Sr, K-Ar, O). - 7 The sm-Nd isotope system in detrital and authigenic argillaceous sediments. - Subject index
    Type of Medium: Monograph available for loan
    Pages: XI, 217 S. : Ill., graph. Darst.
    ISBN: 3540631771
    Series Statement: Lecture notes in earth sciences 68
    Branch Library: AWI Library
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  • 2
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    Radiogenic isotope geochemistry of sedimentary and aquatic systems (1997)
    Berlin [u.a.] : Springer
    Details Availability
    Call number: doi:10.1007/BFb0117747
    Description / Table of Contents: This book takes the reader through the complete weathering cycle, from the continents to the oceans, from the perspective of modern radiogenic isotope geochemistry. Topics include surface weathering, fluvial processes, environmental pollution, oceanography and paleoceanography, sedimentary mineral diagenesis and radiometric dating, thus bridging the gap between processes acting on the Earth today and the geological record. Extensive use is made of carefully selected case studies, both pioneering and state-of-the-art. This book enables the reader to critically assess previous work from the literature as well as encouraging already established researchers to apply the most modern isotopic approaches to their particular field of study.
    Type of Medium: 12
    Pages: XI, 217 S. , Ill., graph. Darst.
    ISBN: 3540631771 (kart.) , 978-3-540-63177-4 (Print) , 978-3-540-69208-9 (Online)
    Series Statement: Lecture notes in earth sciences 68
    URL: http://doi.org/10.1007/BFb0117747
    URL: http://www.gbv.de/dms/goettingen/234150858.pdf
    DOI: 10.1007/BFb0117747
    Language: English
    Note: Pages 1-10, Introduction and basic principles of isotope geochemistry --- Pages 11-31, Weathering --- Pages 33-45, Isotope geochemistry of river water --- Pages 47-88, Isotope geochemistry in the environment --- Pages 89-153, Isotopic composition of seawater past and present (Sr, Nd, Pb, Os, Ce) --- Pages 155-184, Isotope geochemistry of detrital and authigenic clay minerals in marine sediments (Rb−Sr, K−Ar, O) --- Pages 185-211, The Sm−Nd isotope system in detrital and authigenic argillaceous sediments
    Branch Library: GFZ Library
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  • 3
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    Geological investigation of a section at Kulyumbe river in Siberia (2008)
    PANGAEA
    In:  Supplement to: Kouchinsky, Artem; Bengtson, Stefan; Gallet, Y; Korovnikov, I; Pavlov, Vladimir; Runnegar, Bruce; Shields, Graham; Veizer, Jan; Young, Edward; Ziegler, Karen (2008): The SPICE carbon isotope excursion in Siberia: a combined study of the upper Middle Cambrian–lowermost Ordovician Kulyumbe River section, northwestern Siberian Platform. Geological Magazine, 145(5), 609-622, https://doi.org/10.1017/S0016756808004913
    Details
    Publication Date: 2023-05-12
    Description: An integrated, high-resolution chemostratigraphic (C, O and Sr isotopes) and magnetostratigraphic study through the upper Middle Cambrian – lowermost Ordovician shallow-marine carbonates of the northwestern margin of the Siberian Platform is reported. The interval was analysed at the Kulyumbe section, which is exposed along the Kulyumbe River: an eastern tributary of the Enisej River. It comprises the upper Ust'-Brus, Labaz, Orakta, Kulyumbe, Ujgur, and lower Iltyk formations and includes the Steptoean positive carbon isotopic excursion (SPICE) studied here in detail from upper Cambrian carbonates of the Siberian Platform for the first time. The peak of the excursion, showing d13C positive values as high as +4.6‰ and least-altered 87Sr/86Sr ratios of 0.70909, is reported herein from the Yurakhian Horizon of the Kulyumbe Formation. The stratigraphic position of the SPICE excursion does not support traditional correlation of the boundary between the Orakta and Labaz formations at Kulyumbe River with its supposedly equivalent level in Australia, Laurentia, South China, and Kazakhstan, where the Glyptagnostus stolidotus and G. reticulatus biozones are known to immediately precede the SPICE excursion and span the Middle-Upper Cambrian boundary. The Cambrian-Ordovician boundary is probably situated in the middle Nyajan Horizon of the Iltyk Formation, in which carbon isotope values show a local maximum below a decrease in the upper part of the Nyajan Horizon, attributed herein to the Tremadocian. A refined magnetic polarity sequence shows that the geomagnetic reversal frequency was very high during the Middle Cambrian at 5-10 reversals per Ma, assuming a total duration of ~10 Ma and up to 100 magnetic intervals in the Middle Cambrian. By contrast, the sequence attributed herein to the Upper Cambrian on chemostratigraphic grounds contains only 10-11 magnetic intervals. Preprint in Open Access hdl:10013/epic.30209.d001
    Keywords: Geological profile sampling; GEOPRO; Kulyumbe river, Siberia, Russia; Kulyumbe-section
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 4
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    Temporal evolution of shallow marine diagenetic environments: Insights from carbonate concretions (2023)
    Elsevier BV
    In:  EPIC3Geochimica et Cosmochimica Acta, Elsevier BV, 351, pp. 152-166, ISSN: 0016-7037
    Details
    Publication Date: 2023-06-05
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
    Electronic Resource
    Electronic Resource
    Palaeoclimatology Evidence for hot early oceans? (2007)
    [s.l.] : Nature Publishing Group
    Nature 447.2007, 7140, E1-, (1 S.) 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Arising from: F. Robert & M. Chaussidon Nature 443, 969–972 (2006); Robert & Chaussidon reply The oxygen isotopes in sedimentary cherts (siliceous sediments) have been used to argue that the Precambrian ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature05830
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  • 6
    Electronic Resource
    Electronic Resource
    Stratified oceans and oxygenation of the late Precambrian environment: a post glacial geochemical record from the Neoproterozoic of W. Mongolia (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Terra nova 9 (1997), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The late Neoproterozoic (750–545 Ma) was a time of revolutionary environmental change, recurrent glaciation and tectonic upheaval, which culminated in the evolution of metazoans and animal biomineralization. Geochemical data are presented for a post glacial (∼ 700 Ma) limestone succession from W. Mongolia. 87Sr/86Sr is used to constrain the timing of early diagenetic exchange. Stratigraphic trends to high δ13C(carb)) and δ13C(org) mirror sea-level fluctuations, which, we argue, is consistent with the hypothesis that late Precambrian ocean chemistry, was controlled by vertical stratification. Repeated establishment of stratification 700–545 Ma would have led to greater oxygen availability in the surface environment. A causal link between this oxygenation and the further evolution of animals is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3121.1997.tb00016.x
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  • 7
    Electronic Resource
    Electronic Resource
    Neoproterozoic cap carbonates: a critical appraisal of existing models and the plumeworld hypothesis (2005)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 17 (2005), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Evidence for glaciation during the mid-late Neoproterozoic is widespread on Earth, reflecting three or more ice ages between 730 Ma and 580 Ma. Of these, the late Neoproterozoic Marinoan glaciation of approximately 635 Ma stands out because of its ubiquitous association with a characteristic, microcrystalline cap dolostone that drapes glacially influenced rock units worldwide. The Marinoan glaciation is also peculiar in that evidence for low altitude glaciation at equatorial latitudes is compelling. Three models have been proposed linking abrupt deglaciation with this global carbonate precipitation event: (i) overturn of an anoxic deep ocean; (ii) catastrophically accelerated rates of chemical weathering because of supergreenhouse conditions following global glaciation (Snowball Earth Hypothesis); and (iii) massive release of carbonate alkalinity from destabilized methane clathrates. All three models invoke extreme alkalinity fluxes into seawater during deglaciation but none explains how such alkalinity excess from point sources could be distributed homogeneously around the globe. In addition, none explains the consistent sequence of precipitation events observed within cap carbonate successions, specifically: (i) the global blanketing of carbonate powder in shallow marine environments during deglaciation; (ii) widespread and disruptive precipitation of dolomite cement; followed by (iii) localized barite precipitation and seafloor cementation by aragonite. The conceptual model presented here proposes that low latitude deglaciation was so massive and abrupt that the resultant meltwater plume could extend worldwide, physically separating the surface and deep ocean reservoirs for ≥103 years. It is proposed that cap dolostones formed primarily by microbially mediated precipitation of carbonate whitings during algal blooms within this low salinity plumeworld rather than by abiotic precipitation from normal salinity seawater. Many of the disruption features that are characteristic of cap dolostones can be explained by microbially mediated, early diagenetic dolomitization and cementation. The re-initiation of whole ocean circulation degassed CO2 into the atmosphere in areas of upwelling, triggering localized, abiotic CaCO3 precipitation in the form of aragonite fans that overlie cap dolostones in NW Canada and Namibia. The highly oxygenated shallow marine environments of the glacial and post-glacial Neoproterozoic world provided consistently favourable conditions for the evolutionary development of animals and other oxygenophiles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3121.2005.00638.x
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  • 8
    Electronic Resource
    Electronic Resource
    `Molar-tooth microspar': a chemical explanation for its disappearance ∼ 750 Ma (2002)
    Oxford UK : Blackwell Science Ltd
    Terra nova 14 (2002), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Molar-tooth structures are intricately crumpled, microsparry calcite fissure fills that formed during the Precambrian. Strontium isotope stratigraphy constrains the last occurrence of volumetrically significant molar-tooth structure (MT) in the geological record to ∼ 750 Ma. Although the disappearance of MT is commonly ascribed to the influence of metazoans on sediment cohesion, this now seems less plausible because there is no evidence for significant sediment disruption by metazoans before ∼ 550 Ma. It is proposed here that the most likely alternative explanation for MT disappearance is a change in ocean chemistry. A decrease in CaCO3 saturation and/or an increase in the concentration of precipitation inhibitors in mid-Neoproterozoic seawater may have contributed to MT disappearance, and might also help to explain the approximately contemporaneous decline in stromatolite diversity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3121.2002.00396.x
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  • 9
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    Tectonic controls on the long-term carbon isotope mass balance (2017)
    National Academy of Sciences
    Details
    Publication Date: 2017-04-10
    Description: The long-term, steady-state marine carbon isotope record reflects changes to the proportional burial rate of organic carbon relative to total carbon on a global scale. For this reason, times of high δ13C are conventionally interpreted to be oxygenation events caused by excess organic burial. Here we show that the carbon isotope mass balance is also significantly affected by tectonic uplift and erosion via changes to the inorganic carbon cycle that are independent of changes to the isotopic composition of carbon input. This view is supported by inverse covariance between δ13C and a range of uplift proxies, including seawater 87Sr/86Sr, which demonstrates how erosional forcing of carbonate weathering outweighs that of organic burial on geological timescales. A model of the long-term carbon cycle shows that increases in δ13C need not be associated with increased organic burial and that alternative tectonic drivers (erosion, outgassing) provide testable and plausible explanations for sustained deviations from the long-term δ13C mean. Our approach emphasizes the commonly overlooked difference between how net and gross carbon fluxes affect the long-term carbon isotope mass balance, and may lead to reassessment of the role that the δ13C record plays in reconstructing the oxygenation of earth’s surface environment.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    The use of external micro-PIXE to investigate the factors determining the Sr:Ca ratio in the shells of fossil aragonitic molluscs (2001)
    Elsevier
    Details
    Publication Date: 2001-07-01
    Print ISSN: 0168-583X
    Electronic ISSN: 1872-9584
    Topics: Physics
    Published by Elsevier
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