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  • 1
    Online Resource
    Online Resource
    Beryllium isotopes in central Arctic Ocean sediments over the past 12.3 million years : Stratigraphic and paleoclimatic implications (2008)
    Associated volumes
    Details Availability
    In: Paleoceanography, Hoboken, NJ : Wiley, 1986, 23(2008), 1944-9186
    In: volume:23
    In: year:2008
    In: extent:12
    Description / Table of Contents: The upper 200 m of the sediments recovered during IODP Leg 302, the Arctic Coring Expedition (ACEX), to the Lomonosov Ridge in the central Arctic Ocean consist almost exclusively of detrital material. The scarcity of biostratigraphic markers severely complicates the establishment of a reliable chronostratigraphic framework for these sediments, which contain the first continuous record of the Neogene environmental and climatic evolution of the Arctic region. Here we present profiles of cosmogenic 10Be together with the seawater-derived fraction of stable 9Be obtained from the ACEX cores. The down-core decrease of 10Be/9Be provides an average sedimentation rate of 14.5 ± 1 m/Ma for the uppermost 151 m of the ACEX record and allows the establishment of a chronostratigraphy for the past 12.3 Ma. The age-corrected 10Be concentrations and 10Be/9Be ratios suggest the existence of an essentially continuous sea ice cover over the past 12.3 Ma.
    Type of Medium: Online Resource
    Pages: 12
    ISSN: 1944-9186
    DOI: 10.1029/2007PA001478
    Language: English
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  • 2
    Online Resource
    Online Resource
    Pleistocene variations of beryllium isotopes in central Arctic Ocean sediment cores (2009)
    Associated volumes
    Details Availability
    In: Global and planetary change, Amsterdam [u.a.] : Elsevier Science, 1989, 68(2009), 1/2, Seite 38-47
    In: volume:68
    In: year:2009
    In: number:1/2
    In: pages:38-47
    Type of Medium: Online Resource
    Pages: graph. Darst
    DOI: 10.1016/j.gloplacha.2009.03.024
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    Implications of the fault scaling law for the growth of topography: mountain ranges in the broken foreland of north-east Tibet (2004)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 16 (2004), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A fault scaling law suggests that, over eight orders of magnitude, fault length L is linearly related to maximum displacement D. Individual faults may therefore retain a constant ratio of D/L as they grow. If erosion is minor compared with tectonic uplift, the length and along-strike relief of young mountain ranges should thus reflect fault growth. Topographic profiles along the crests of mountain ranges in the actively deforming foreland of north-east Tibet exhibit a characteristic shape with maximum height near their centre and decreasing elevation toward the tips. We interpret the along-strike relief of these ranges to reflect the slip distribution on high-angle reverse faults. A geometric model illustrates that the lateral propagation rate of such mountain ranges may be deciphered if their length-to-height ratio has remained constant. As an application of the model, we reconstruct the growth of the Heli Shan using a long-term uplift rate of ∼1.3 mm yr−1 derived from 21Ne and 10Be exposure dating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3121.2004.00549.x
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  • 4
    Electronic Resource
    Electronic Resource
    Lithology, landscape dissection and glaciation controls on catchment erosion as determined by cosmogenic nuclides in river sediment (the Wutach Gorge, Black Forest) (2003)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 15 (2003), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Cosmogenic nuclides, measured in quartz from recent river bedload, provide a novel tool to quantify catchment-wide erosion rates at geologically meaningful time scales. Here we present an analysis of the geomorphological evolution of the 350 km2 Wutach catchment in the uplands of the south-west German Black Forest. The robustness of the method is demonstrated by the fact that, although the area was affected by river capture at 18 kyr bp, the formed gorge is so narrow that spatially averaged erosion rates were not resolvably perturbed. However, because cosmogenic nuclides preserve an erosion memory of several thousand years, the only perturbation introduced was detected in the minor areas that have been subject to the last maximum glaciation. In unglaciated areas, an important relationship between lithology and erosion can by quantified: sandstone lithologies erode at 12–18 mm kyr−1, granite lithologies at 35–47 mm kyr−1 and limestone lithologies (as deduced from river load gauging) at 70–90 mm kyr−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3121.2003.00519.x
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  • 5
    Electronic Resource
    Electronic Resource
    A Proposal to Use Chlorine-36 for Monitoring the Movement of Radionuclides from Nuclear Explosions (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water monitoring & remediation 10 (1990), S. 0 
    Details
    ISSN: 1745-6592
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Chlorine-36 has been produced in large amounts by hundreds of nuclear explosions on the Nevada Test Site as well as 12 off-site explosions at eight locations in five states. Continued monitoring of the redistribution of radionuclides by subsurface water is of concern in most of the areas affected by the detonations. Chlorine-36 has the following advantages as a built-in tracer for this redistribution: its mobility is equal to or greater than water, its long half-life assures its continued usefulness over long periods, collection and storage of samples is simple, it is not subject to vapor transport at ordinary temperatures, its natural background is very low, and it does not form insoluble precipitates. Chlorine-36 from the Gnome event near Carlsbad, New Mexico, illustrates how 36C1 can be used to help study the redistribution of radionuclides in the soil profile. Chlorine-36 is also potentially useful as a tracer to study movement of contaminants around large nuclear reactor complexes and near respositories for radioactive waste.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6592.1990.tb00009.x
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  • 6
    Electronic Resource
    Electronic Resource
    Low slip rates and long-term preservation of geomorphic features in Central Asia (2002)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 417 (2002), S. 428-432 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In order to understand the dynamics of the India–Asia collision zone, it is important to know the strain distribution in Central Asia, whose determination relies on the slip rates for active faults. Many previous slip-rate estimates of faults in Central Asia were based on the assumption ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/417428a
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  • 7
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    Origin and age of submarine ferromanganese hardgrounds from the Marion Plateau, offshore northeast Australia (2007)
    In:  Proceedings of the Ocean Drilling Program: Scientific Results, 194 . pp. 1-22.
    Details
    Publication Date: 2012-07-06
    Description: Be and Nd isotope compositions and metal concentrations (Mn, Fe, Co, Ni, and Cu) of surface and subsurface ferromanganese hardground crusts from Ocean Drilling Program Leg 194 Marion Plateau Sites 1194 and 1196 provide new insights into the crusts' genesis, growth rates, and ages. Metal compositions indicate that the hardgrounds, which have grown on erosional surfaces in water depths of 〈400 m because of strong bottom currents, are not pure hydrogenetic precipitates. Nevertheless, the ratios between cosmogenic 10Be and stable 9Be in hardgrounds from the present-day seafloor at Site 1196 between 1 x 10–7 and 1.5 x 10–7 are within the range of values expected for Pacific seawater, which shows that the hardgrounds recorded the isotope composition of ambient seawater. This is also confirmed by their Nd isotope composition (Nd between –3 and 0). The 10Be/9Be ratios in the up to 30-mm-thick and partly laminated hardgrounds do not show a decrease with depth, which suggests high growth rates on the present-day seafloor. The subsurface crust at Site 1194 (117 m below the seafloor) grew during a sedimentation hiatus, when bottom currents in the late Miocene prevented sediment accumulation on the carbonate platform during a sea level lowstand. The age of 8.65 ± 0.50 Ma for this crust obtained from 10Be-based dating agrees well with the combined seismostratigraphic and biostratigraphic evidence, which suggests an age for the hiatus between 7.7 and 11.8 Ma.
    Type: Article , NonPeerReviewed
    Format: text
    DOI: 10.2973/odp.proc.sr.194.008.2007
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    OceanRep: Article in a Scientific Journal - without review
  • 8
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    Arctic Ocean evidence for late Quaternary initiation of northern Eurasian ice sheets (1997)
    GSA, Geological Society of America
    In:  Geology, 25 (9). pp. 783-786.
    Details
    Publication Date: 2017-04-10
    Description: A high-resolution multiparameter stratigraphy allows the identification of late Quaternary glacial and interglacial cycles in a central Arctic Ocean sediment core. Distinct sandy layers in the upper part of the otherwise fine-grained sediment core from the Lomonosov Ridge (lat 87.5°N) correlate to four major glacials since ca. 0.7 Ma. The composition of these ice-rafted terrigenous sediments points to a glaciated northern Siberia as the main source. In contrast, lithic carbonates derived from North America are also present in older sediments and indicate a northern North American glaciation since at least 2.8 Ma. We conclude that large-scale northern Siberian glaciation began much later than other Northern Hemisphere ice sheets.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1130/0091-7613(1997)​025〈0783:AOEFLQ〉​2.3.CO;2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Beryllium isotopes in central Arctic Ocean sediments over the past 12.3 million years: Stratigraphic and paleoclimatic implications (2008)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 23 (PA1S03).
    Details
    Publication Date: 2019-09-23
    Description: The upper 200 m of the sediments recovered during IODP Leg 302, the Arctic Coring Expedition (ACEX), to the Lomonosov Ridge in the central Arctic Ocean consist almost exclusively of detrital material. The scarcity of biostratigraphic markers severely complicates the establishment of a reliable chronostratigraphic framework for these sediments, which contain the first continuous record of the Neogene environmental and climatic evolution of the Arctic region. Here we present profiles of cosmogenic 10Be together with the seawater-derived fraction of stable 9Be obtained from the ACEX cores. The down-core decrease of 10Be/9Be provides an average sedimentation rate of 14.5 ± 1 m/Ma for the uppermost 151 m of the ACEX record and allows the establishment of a chronostratigraphy for the past 12.3 Ma. The age-corrected 10Be concentrations and 10Be/9Be ratios suggest the existence of an essentially continuous sea ice cover over the past 12.3 Ma.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2007PA001478
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Pleistocene variations of beryllium isotopes in central Arctic Ocean sediment cores (2009)
    Elsevier
    In:  Global and Planetary Change, 68 . pp. 38-47.
    Details
    Publication Date: 2017-10-12
    Description: Neogene marine sediments can be dated via decay of the cosmogenic radionuclide Be-10. Two cores from the Alpha and Mendeleev Ridges in the Arctic Ocean have been analyzed for seawater-derived beryllium (Be) isotopes in order to date the sediments and to calculate sedimentation rates. The decrease of Be-10 concentration in the cores was used to calculate first order sedimentation rates. To eliminate the dilution effect of beryllium caused by short-term changes in sedimentation rate and grain size, the Be-10 concentrations were normalized to the terrigenous stable isotope Be-9 determined in the same sample aliquot. The measured Be-10 concentrations yield low average sedimentation rates for the Alpha and Mendeleev Ridges of 2.3 mm ka(-1) and 2.7 mm ka(-1), respectively. Sedimentation rates calculated from the Be-10/Be-9 ratios result in similarly low values, ranging from 0.2 to 6.8 mm ka(-1) for the Alpha Ridge core and from 1.9 to 6.9 mm ka(-1) for the Mendeleev Ridge core. However, amino acid racemization dating for the past 150 ka of a core adjacent to the Mendeleev Ridge core studied here indicates significantly higher sedimentation rates than calculated from the downcore decrease of Be-10 and Be-10/Be-9. If such higher rates also prevailed at the locations of our cores, for which there is biostratigraphic evidence, either the supply of Be-10 was much lower than assumed or that of Be-9 was much higher. This could imply that the signature of the deep waters in this part of the Arctic Ocean compared to today was largely different for most of the past approximately one million years with a significantly lower Be-10/Be-9 ratio. Our study also addresses the variability of beryllium isotopes in sediment cores across the Arctic Ocean through a comparison of previously published results. Calculated Be-10 fluxes reveal low values in the Amerasian Basin and highest values in the Eurasian Basin, near the Fram. Strait. The decrease of Be isotopes in the two studied Amerasian Basin cores may thus have been caused by environmental factors such as significantly reduced inflow of Atlantic waters in the past, reduced input of Be-10 and/or increased input of Be-9 from the shelves, combined with a more efficient sea ice shielding in this part of the Arctic Ocean. (C) 2009 Elsevier B.V. All rights reserved.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1016/j.gloplacha.2009.03.024
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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