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  • 1
    Monograph available for loan
    Monograph available for loan
    Glaciated margins : the sedimentary and geophysical archive (2019)
    London : The Geological Society
    Associated volumes
    Details Availability
    Call number: 9/M 07.0421(475)
    In: Geological Society Special Publication
    Description / Table of Contents: Abstract Understanding the sedimentary and geophysical archive of glaciated margins is a complex task that requires integration and analysis of disparate sedimentological and geophysical data. Their analysis is vital for understanding the dynamics of past ice sheets and how they interact with their neighbouring marine basins, on timescales that cannot be captured by observations of the cryosphere today. As resources, sediments deposited on the inner margins of glaciated shelves also exhibit resource potential where more sand-dominated systems occur, acting as reservoirs for both hydrocarbons and water. This book surveys the full gamut of glaciated margins, from deep time (Neoproterozoic, Ordovician and Carboniferous–Permian) to modern high-latitude margins in Canada and Antarctica. This collection of papers is the first attempt to deliberately do this, allowing not only the similarities and differences between modern and ancient glaciated margins to be explored, but also the wide spectrum of their mechanisms of investigation to be probed. Together, these papers offer a high-resolution, spatially and temporally diverse blueprint of the depositional processes, ice sheet dynamics, and basin architectures of the world's former glaciated margins; a vital resource in advancing understanding of our present and future marine-terminating ice sheet margins.
    Type of Medium: Monograph available for loan
    Pages: 288 Seiten , Illustrationen
    ISBN: 978-1-78620-397-7
    Series Statement: Geological Society Special Publication 475
    URL: https://sp.lyellcollection.org/content/475/1
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
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    Glaciated Margins: The Sedimentary and Geophysical Archive (2019)
    London : The Geological Society
    Details
    Keywords: cryosphere ; glaciology ; sedimentology ; geophysics
    Description / Table of Contents: An introduction to glaciated margins: the sedimentary and geophysical archive / D. P. Le Heron, K. A. Hogan, E. R. Phillips, M. Huuse, M. E. Busfield and A. G. C. Graham / Geological Society, London, Special Publications, 475, 1-8, 30 January 2019, https://doi.org/10.1144/SP475.12 --- Glacio-marine iron formation deposition in a c. 700 Ma glaciated margin: insights from the Chuos Formation, Namibia / Maxwell A. Lechte, Malcolm W. Wallace and Karl-Heinz Hoffmann / Geological Society, London, Special Publications, 475, 9-34, 16 March 2018, https://doi.org/10.1144/SP475.2 --- A tale of two rift shoulders, and two ice masses: the Cryogenian glaciated margin of Death Valley, California / D. P. Le Heron, M. E. Busfield, D. O. Ali, T. Vandyk and S. Tofaif / Geological Society, London, Special Publications, 475, 35-52, 27 July 2018, https://doi.org/10.1144/SP475.11 --- Zarqa megafacies: widespread subglacial deformation in the Sarah Formation of Saudi Arabia and implications for the sequence stratigraphy of the Hirnantian glaciation / John Melvin / Geological Society, London, Special Publications, 475, 53-80, 7 March 2018, https://doi.org/10.1144/SP475.6 --- Development of a palaeovalley complex on a Late Ordovician glaciated margin in NW Saudi Arabia / S. Tofaif, D. P. Le Heron and J. Melvin / Geological Society, London, Special Publications, 475, 81-107, 6 June 2018, https://doi.org/10.1144/SP475.8 --- Depositional model for the distal Ordovician glaciated margin of Jordan; implications for the reservoir potential of the Risha Formation / J. Philip P. Hirst and Maher Khatatneh / Geological Society, London, Special Publications, 475, 109-129, 1 March 2018, https://doi.org/10.1144/SP475.4 --- Sedimentary record of Early Permian deglaciation in southern Gondwana from the Falkland Islands / Kate Horan, Philip Stone and Simon J. Crowhurst / Geological Society, London, Special Publications, 475, 131-147, 19 March 2018, https://doi.org/10.1144/SP475.1 --- Deglacial sequences and glacio-isostatic adjustment: Quaternary compared with Ordovician glaciations / Pierre Dietrich, Jean-François Ghienne, Patrick Lajeunesse, Alexandre Normandeau, Rémy Deschamps and Philippe Razin / Geological Society, London, Special Publications, 475, 149-179, 14 May 2018, https://doi.org/10.1144/SP475.9 --- Sedimentary processes and facies on a high-latitude passive continental margin, Wilkes Land, East Antarctica / Sandra Passchier, Daniel J. Ciarletta, Victor Henao and Vicky Sekkas / Geological Society, London, Special Publications, 475, 181-201, 16 March 2018, https://doi.org/10.1144/SP475.3 --- Processes influencing differences in Arctic and Antarctic trough mouth fan sedimentology / Jenny Gales, Claus-Dieter Hillenbrand, Rob Larter, Jan Sverre Laberg, Martin Melles, Sara Benetti and Sandra Passchier / Geological Society, London, Special Publications, 475, 203-221, 23 March 2018, https://doi.org/10.1144/SP475.7 --- Seismic and geomorphic records of Antarctic Ice Sheet evolution in the Ross Sea and controlling factors in its behaviour / John B. Anderson, Lauren M. Simkins, Phillip J. Bart, Laura De Santis, Anna Ruth W. Halberstadt, Elisabetta Olivo and Sarah L. Greenwood / Geological Society, London, Special Publications, 475, 223-240, 17 April 2018, https://doi.org/10.1144/SP475.5 --- Late Wisconsinan grounding zones of the Laurentide Ice Sheet margin off the Québec North Shore (NW Gulf of St Lawrence) / P. Lajeunesse, P. Dietrich and J.-F. Ghienne / Geological Society, London, Special Publications, 475, 241-259, 25 June 2018, https://doi.org/10.1144/SP475.10 --- The glacier-influenced marine record on high-latitude continental margins: synergies between modern, Quaternary and ancient evidence / J. A. Dowdeswell, K. A. Hogan and D. P. Le Heron / Geological Society, London, Special Publications, 475, 261-279, 29 January 2019, https://doi.org/10.1144/SP475.13
    Pages: Online-Ressource (288 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781786203977
    URL: https://sp.lyellcollection.org/content/475/1
    Language: English
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  • 3
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    Landform assemblage produced by ice-grounding events on the Yermak Plateau (2016)
    Geological Society
    In:  EPIC3Atlas of Submarine Glacial Landforms: Modern, Quaternary and Ancient., Geological Society, London, Memoirs, London, Memoirs, Geological Society, 46(1), pp. 329-332, ISSN: 0435-4052
    Details
    Publication Date: 2017-06-01
    Description: The landforms and sediments preserved on the Yermak Plateau (Figs 1–3) provide information on the glacial history and past dynamics of the northwestern-most sector of the Eurasian Ice Sheet (Dowdeswell et al. 2010; Gebhardt et al. 2011), as well as the exchange of ice and water between the North Atlantic and the Arctic Ocean via Fram Strait (Fig. 1a) (Jakobsson et al. 2010). Early ideas about Quaternary ice cover in the Arctic Ocean pro- posed the existence of a circum-Arctic ice shelf prior to the last gla- ciation (e.g. Mercer 1970). More recent work suggested that the major glaciations since the interglacial period of marine oxygen isotope stage (MIS) 5.5 did not extend beyond the Eurasian conti- nental shelf edges. However, geophysical data reveal that ice extended across the Yermak Plateau prior to MIS 5.5 during the particularly extensive glaciation in MIS 6 (Dowdeswell et al. 2010; Jakobsson et al. 2010). By contrast, the presence of a grounding-zone complex beyond NW Spitsbergen (Fig. 3) implies that grounded ice did not extend onto the Yermak Plateau during the Last Glacial Maximum (LGM) (Ottesen & Dowdeswell 2009).
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 4
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    Multichannel Seismic Investigations of Sediment Drifts off West Antarctica and the Antarctic Peninsula: Preliminary Results from Research Cruise JR298 (2015)
    In:  EPIC3AGU Fall Meeting, San Francisco, USA, 2015-12-13-2015-12-18
    Details
    Publication Date: 2015-09-14
    Description: The West Antarctic Ice Sheet (WAIS) and Antarctic Peninsula Ice Sheet (APIS) have exhibited significant changes over recent decades but there is still great uncertainty about how rapidly and how far they will retreat in a warmer climate. For example, it remains unclear whether or not the marine-based WAIS “collapsed” during the last interglacial period, resulting in a global sea-level rise contribution of more than 3 m. Previous studies, including Ocean Drilling Program (ODP) Leg 178, have shown that sediment drifts on the continental rise west of the Antarctic Peninsula contain a rich high-resolution archive of Antarctic margin paleoceanography and APIS history that extends back to at least the Late Miocene. The potential of existing ODP cores from the drifts is, however, compromised by the fact that composite sections are incomplete and lack of precise chronological control. A new drilling proposal (732-Full2) has been scientifically approved and is with the JOIDES Resolution Facilities Board of the International Ocean Discovery Program for scheduling. The main aims of the proposal are to obtain continuous, high-resolution records from sites on sediment drifts off both the Antarctic Peninsula and West Antarctica (southern Bellingshausen Sea) and to achieve good chronological control on them using a range of techniques. We present preliminary results from a recent site survey investigation cruise on RRS James Clark Ross (JR298) that obtained high-resolution multichannel seismic reflection data over the proposed sites and adjacent working areas. The new data provide a basis for interpretation of (i) sedimentary processes that operated during the development of the drifts, and (ii) links between depositional systems on the continental rise, paleo-ice-sheet dynamics and paleoceanographic processes. Through further analyses of seismic and other geophysical data, in combination with marine sediment cores retrieved from the proposed sites, we aim to provide insight into polar margin sediment delivery, Antarctic ice-sheet history and stability, and Antarctic margin paleoceanography. Subsequently, the proposed drilling campaign will allow a detailed chronology to be established on extended records that will provide a basis for high-resolution interpretations extending back through the Pliocene.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 5
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    Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream (2019)
    In:  EPIC3The Cryosphere, 13(6), pp. 1583-1596
    Details
    Publication Date: 2019-06-09
    Description: Basal hydrological systems play an important role in controlling the dynamic behaviour of ice streams. Data showing their morphology and relationship to geological substrates beneath modern ice streams are, however, sparse and difficult to collect. We present new multibeam bathymetry data that make the Anvers-Hugo Trough west of the Antarctic Peninsula the most completely surveyed palaeo-ice stream pathway in Antarctica. The data reveal a diverse range of landforms, including streamlined features where there was fast flow in the palaeo-ice stream, channels eroded by flow of subglacial water, and compelling evidence of palaeo-ice stream shear margin locations. We interpret landforms as indicating that subglacial water availability played an important role in facilitating ice stream flow and controlling shear margin positions. Water was likely supplied to the ice stream bed episodically as a result of outbursts from a subglacial lake located in the Palmer Deep basin on the inner continental shelf. These interpretations have implications for controls on the onset of fast ice flow, the dynamic behaviour of palaeo-ice streams on the Antarctic continental shelf, and potentially also for behaviour of modern ice streams.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 6
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    Nordvestfjord: a major East Greenland fjord system (2016)
    The Geological Society, London
    In:  EPIC3Geological Society, London Memoirs 46, The Geological Society, London, pp. 43-46
    Details
    Publication Date: 2017-05-29
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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  • 7
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    Catching the drift: preliminary results from site survey investigations of sediment drifts off West Antarctica and the Antarctic Peninsula (2015)
    In:  EPIC3UK IODP General Conference, Newcastle University, UK, 2015-09-25-2015-09-25
    Details
    Publication Date: 2015-09-14
    Description: The West Antarctic Ice Sheet (WAIS) and Antarctic Peninsula Ice Sheet (APIS) have exhibited significant changes over recent decades but there is still great uncertainty about how rapidly and how far they will retreat in a warmer climate. For example, it remains unclear whether or not the marine-based WAIS “collapsed” during the last interglacial period, resulting in a global sea-level rise contribution of more than 3 m. Previous studies, including Ocean Drilling Program (ODP) Leg 178, have shown that sediment drifts on the continental rise west of the Antarctic Peninsula contain a rich high-resolution archive of Southern Ocean palaeoceanography and APIS history that extends back to at least the Late Miocene. The potential of existing ODP cores from the drifts is, however, compromised by incomplete composite sections and lack of precise chronological control. A proposal for future drilling on the drifts (732-Full2) has been scientifically approved and is with the JOIDES Resolution Facilities Board for scheduling. The main aims of the proposal are to obtain continuous, high-resolution records from sites on sediment drifts off both the Antarctic Peninsula and West Antarctica (southern Bellingshausen Sea) and to achieve good chronological control on them using a range of techniques. We present preliminary results from a recent site survey investigation cruise on RRS James Clark Ross (JR298) that obtained high-resolution multichannel seismic reflection data, piston cores and box cores to bolster this proposal. The new data and cores provide opportunities to improve understanding of the depositional setting, ensure that there is a comprehensive site survey data package to allay any concerns that the Environmental Protection and Safety Panel may raise, and allow testing of some of the hypotheses underpinning the proposal. The new seismic data provide a basis for interpretation of (i) sedimentary processes that operated during the development of the drifts, and (ii) links between depositional systems on the continental rise, palaeo-ice-sheet dynamics and palaeoceanographic processes. Through further analyses of the seismic and other geophysical data, in combination with the marine sediment cores, we aim to provide insight into polar margin sediment delivery, Antarctic ice-sheet history and stability, and Southern Ocean palaeoceanography. Subsequently, the proposed drilling campaign will allow a detailed chronology to be established on extended records that will provide a basis for high-resolution interpretations extending back through the Pliocene.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 8
    Electronic Resource
    Electronic Resource
    Increases of chlorophyll a/b ratios during acclimation of tropical woody seedlings to nitrogen limitation and high light (2003)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 26 (2003), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: According to the theory of optimal nitrogen partitioning within a leaf, the chlorophyll (Chl) a/b ratio is expected to increase when leaf N content decreases. Here, we report the first empirical support for this prediction. The Chl a/b ratio increased while Chl content decreased in response to N limitation in photosynthetic cotyledons and leaves of seedlings of four tropical woody species in the Bignoniaceae. The responses of all four species were in the same direction, but differed in magnitude. For Tabebuia rosea, the species that exhibited the greatest increase in Chl a/b ratios (up to values of 5.9), detailed photosynthetic characteristics were also examined. Light and N availability were positively correlated with the light- and CO2-saturated photosynthetic O2 evolution rate, as well as with leaf carboxylation capacity (Vcmax) and electron transport rate (Vj). Severe N limitation and high light did not cause chronic photo-inhibition (i.e. no change in quantum yield or in dark-acclimated Fv/Fm). The observed change in the ratio of Vcmax to leaf N in response to N availability was consistent with likely functional reasons for change in the Chl a/b ratio. Adjustment of the Chl a/b ratio was apparently an integral feature of acclimation to high light conditions and low N availability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2003.01017.x
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  • 9
    Electronic Resource
    Electronic Resource
    Response of transpiration and photosynthesis to a transient change in illuminated foliage area for a Pinus radiata D. Don tree (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 19 (1996), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Sudden but transient changes in the fraction or illuminated foliage area in a well-watered 7-year-old Pinus radiata D. Don tree were imposed by completely covering either the upper 22% or the lower 78% of the foliage for periods of up to 36 h. Measurements of transpiration flux density (E), tree conductance (gt), stomatal conductance (gs) and net photosynthesis (A) were made to test the hypothesis that compensatory responses would occur in the remaining illuminated foliage when the cover was installed. When the lower foliage was covered there was an immediate decrease in gt. However, when tree conductance was normalized with respect to the illuminated leaf area (gt'), it increased between 50 and 75%, depending on the value of air saturation deficit (D). The effect was also apparent from concurrent measurements of increases in gs and A up to 59 and 24%, respectively, for needles in the top third of (he crown. When the cover was removed these effects were reversed. The changes in the lower foliage when the upper foliage was covered were much smaller. Changes in bulk needle water potential were small. It is suggested that the observed responses occurred because of a perturbation to the hydraulic pathway in the xylem that could have triggered the action of a chemical signal to regulate stomatal conductance and photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1996.tb00459.x
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  • 10
    Electronic Resource
    Electronic Resource
    Potential effects of elevated CO2 and changes in temperature on tropical plants (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 14 (1991), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Very little attention has been directed at the responses of tropical plants to increases in global atmospheric CO2 concentrations and the potential climatic changes. The available data, from greenhouse and laboratory studies, indicate that the photosynthesis, growth and water use efficiency of tropical plants can increase at higher CO2 concentrations. However, under field conditions abiotic (light, water or nutrients) or biotic (competition or herbivory) factors might limit these responses. In general, elevated atmospheric CO2 concentrations seem to increase plant tolerance to stress, including low water availability, high or low temperature, and photoinhibition. Thus, some species may be able to extend their ranges into physically less favourable sites, and biological interactions may become relatively more important in determining the distribution and abundance of species. Tropical plants may be more narrowly adapted to prevailing temperature regimes than are temperate plants, so expected changes in temperature might be relatively more important in the tropics. Reduced transpiration due to decreased stomatal conductance could modify the effects of water stress as a cue for vegetative or reproductive phenology of plants of seasonal tropical areas. The available information suggests that changes in atmospheric CO2 concentrations could affect processes as varied as plant/herbivore interactions, decomposition and nutrient cycling, local and geographic distributions of species and community types, and ecosystem productivity. However, data on tropical plants are few, and there seem to be no published tropical studies carried out in the field. Immediate steps should be undertaken to reduce our ignorance of this critical area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1991.tb01441.x
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