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  • 1
    Monograph available for loan
    Monograph available for loan
    Weddell Sea tectonics and Gondwana break-up (1996)
    London : The Geological Society
    Associated volumes
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    Call number: AWI G9-96-0315
    In: Geological Society special publication, No. 108
    Description / Table of Contents: The Weddell Sea, part of the circumpolar Southern Ocean, is probably the most remote, least known and least accessible sea in the world. Difficult ice conditions have limited the acquisition of ship data, although this has been partly offset in recent years by access to satellite radar altimetry data. The Weddell Sea was originally defined by the Admiralty Hydrographic Department in 1932 and redefined by the Antarctic Place Names Committee in 1976 (Hattersley-Smith 1991). It is bounded on the western side by the east coast of the Antarctic Peninsula, on the southern side by the Ronne and Filchner ice fronts, and on the southeastern side by the Dronning Maud Land and Coats Land coasts of East Antarctica (Fig. 1). The South Scotia Ridge separates the Weddell Sea from the Scotia Sea to the north and a line joining Southern Thule in the South Sandwich Islands and Kapp Norvegia in Dronning Maud Land, separates it from the South Atlantic Ocean to the NE. Within this volume, papers relate to the Weddell Sea as defined above, together with part of the adjoining South Atlantic Ocean up to 50°E, and to the geology of the once neighbouring continents of Gondwana. The term Weddell Sea embayment is also used informally throughout this volume to include the embayment area to the south of the Weddell Sea now covered by the Ronne and Filchner ice shelves, including Berkner Island, and the continental shelf north of the Ronne and Filchner ice fronts (Figs 1 & 2).
    Type of Medium: Monograph available for loan
    Pages: 284 Seiten , Illustrationen , 25,5 cm
    Edition: First published
    ISBN: 1897799594 , 1-897799-59-4
    Series Statement: Geological Society special publication 108
    URL: http://sp.lyellcollection.org/content/108/1
    Language: English
    Note: Contents E. C. King, R. A. Livermore, and B. C. Storey: Weddell Sea tectonics and Gondwana break-up: an introduction / Geological Society, London, Special Publications, 108:1-10, doi:10.1144/GSL.SP.1996.108.01.01 --- Michael L. Curtis and Bryan C. Storey: A review of geological constraints on the pre-break-up position of the Ellsworth Mountains within Gondwana: implications for Weddell Sea evolution / Geological Society, London, Special Publications, 108:11-30, doi:10.1144/GSL.SP.1996.108.01.02 --- Vic Divenere, Dennis V. Kent, and Ian W. D. Dalziel: Summary of palaeomagnetic results from West Antarctica: implications for the tectonic evolution of the Pacific margin of Gondwana during the Mesozoic / Geological Society, London, Special Publications, 108:31-43, doi:10.1144/GSL.SP.1996.108.01.03 --- T. S. Brewer, D. Rex, P. G. Guise, and C. J. Hawkesworth: Geochronology of Mesozoic tholeiitic magmatism in Antarctica: implications for the development of the failed Weddell Sea rift system / Geological Society, London, Special Publications, 108:45-61, doi:10.1144/GSL.SP.1996.108.01.04 --- G. H. Grantham: Aspects of Jurassic magmatism and faulting in western Dronning Maud Land, Antarctica: implications for Gondwana break-up / Geological Society, London, Special Publications, 108:63-71, doi:10.1144/GSL.SP.1996.108.01.05 --- W. Reimer, H. Miller, and H. Mehl: Mesozoic and Cenozoic palaeo-stress fields of the South Patagonian Massif deduced from structural and remote sensing data / Geological Society, London, Special Publications, 108:73-85, doi:10.1144/GSL.SP.1996.108.01.06 --- Bryan C. Storey, Alan P. M. Vaughan, and Ian L. Millar: Geodynamic evolution of the Antarctic Peninsula during Mesozoic times and its bearing on Weddell Sea history / Geological Society, London, Special Publications, 108:87-103, doi:10.1144/GSL.SP.1996.108.01.07 --- P. C. Richards, R. W. Gatliff, M. F. Quinn, N. G. T. Fannin, and J. P. Williamson: The geological evolution of the Falkland Islands continental shelf / Geological Society, London, Special Publications, 108:105-128, doi:10.1144/GSL.SP.1996.108.01.08 --- W. Jokat, C. Hübscher, U. Meyer, L. Oszko, T. Schöne, W. Versteeg, and H. Miller: The continental margin off East Antarctica between 10°W and 30°W / Geological Society, London, Special Publications, 108:129-141, doi:10.1144/GSL.SP.1996.108.01.09 --- R. J. Hunter, A. C. Johnson, and N. D. Aleshkova: Aeromagnetic data from the southern Weddell Sea embayment and adjacent areas: synthesis and interpretation / Geological Society, London, Special Publications, 108:143-154, doi:10.1144/GSL.SP.1996.108.01.10 --- David C. McAdoo and Seymour W. Laxon: Marine gravity from Geosat and ERS-1 altimetry in the Weddell Sea / Geological Society, London, Special Publications, 108:155-164, doi:10.1144/GSL.SP.1996.108.01.11 --- W. Jokat, H. Miller, and C. Hübscher: Crustal structure of the Antarctic continental margin in the eastern Weddell Sea / Geological Society, London, Special Publications, 108:165-174, doi:10.1144/GSL.SP.1996.108.01.12 --- G. L. Leitchenkov, H. Miller, and E. N. Zatzepin: Structure and Mesozoic evolution of the eastern Weddell Sea, Antarctica: history of early Gondwana break-up / Geological Society, London, Special Publications, 108:175-190, doi:10.1144/GSL.SP.1996.108.01.13 --- Joachim Jacobs, Norbert Kaul, and Klaus Weber: The history of denudation and resedimentation at the continental margin of western Dronning Maud Land, Antarctica, during break-up of Gondwana / Geological Society, London, Special Publications, 108:191-199, doi:10.1144/GSL.SP.1996.108.01.14 --- W. Jokat, H. Miller, and C. Hübscher: Structure and origin of southern Weddell Sea crust: results and implications / Geological Society, London, Special Publications, 108:201-211, doi:10.1144/GSL.SP.1996.108.01.15 --- E. C. King and A. C. Bell: New seismic data from the Ronne Ice Shelf, Antarctica / Geological Society, London, Special Publications, 108:213-226, doi:10.1144/GSL.SP.1996.108.01.16 --- R. A. Livermore and R. J. Hunter: Mesozoic seafloor spreading in the southern Weddell Sea / Geological Society, London, Special Publications, 108:227-241, doi:10.1144/GSL.SP.1996.108.01.17 --- H. A. Roeser, J. Fritsch, and K. Hinz: The development of the crust off Dronning Maud Land, East Antarctica / Geological Society, London, Special Publications, 108:243-264, doi:10.1144/GSL.SP.1996.108.01.18 --- Yoshifumi Nogi, Nobukazu Seama, Nobuhiro Isezaki, and Yoichi Fukuda: Magnetic anomaly lineations and fracture zones deduced from vector magnetic anomalies in the West Enderby Basin / Geological Society, London, Special Publications, 108:265-273, doi:10.1144/GSL.SP.1996.108.01.19
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  • 2
    Electronic Resource
    Electronic Resource
    Scotia Sea tectonics from high-resolution satellite gravity
    Amsterdam : Elsevier
    Earth and Planetary Science Letters 123 (1994), S. 255-268 
    Details
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0012-821X(94)90272-0
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  • 3
    Electronic Resource
    Electronic Resource
    Late Palaeozoic to early Mesozoic evolution of Pangaea (1986)
    [s.l.] : Nature Publishing Group
    Nature 322 (1986), S. 162-165 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Hallam1 reviewed geological information concerning the possible configuration of the Pangaea supercontinent in Permo-Carboniferous time and concluded that the evidence favours an unchanged configuration from the late Carboniferous to the Jurassic. However, the palaeomagnetic data disagree with such ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/322162a0
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  • 4
    Electronic Resource
    Electronic Resource
    Unusual sea-floor fabric near the Bullard fracture zone imaged by GLORIA sidescan sonar (1991)
    [s.l.] : Nature Publishing Group
    Nature 353 (1991), S. 158-161 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] During the first deployment of the IOS long-range sidescan sonar GLORIA in the Southern Ocean in 1989, two swaths of imagery were collected near the 550-km offset Bullard fracture zone (Fig. 1), which lies on the South American-Antarctic Ridge system (SAAR), midway between the southern South ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/353158a0
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  • 5
    Electronic Resource
    Electronic Resource
    Comprehensive sonar imaging of the Easter microplate (1989)
    [s.l.] : Nature Publishing Group
    Nature 341 (1989), S. 701-705 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Recent GLORIA and SeaMARC II sidescan sonar surveys have imaged virtually the whole of the Easter microplate, and revealed unprecedented detail and complexity in its tectonic fabric and history. There is clear evidence of rapid microplate rotation, of rapidly evolving plate boundaries and of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/341701a0
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  • 6
    Electronic Resource
    Electronic Resource
    Large Amplitude Magnetic Anomalies in the Northern Sector of the Powell Basin, NE Antarctic Peninsula (1997)
    Springer
    Marine geophysical researches 19 (1997), S. 65-80 
    Details
    ISSN: 1573-0581
    Keywords: Antarctic Peninsula ; Powell Basin ; Magnetic Anomaly ; West Coast Magnetic Anomaly ; Pacific Margin Anomaly ; South Scotia Ridge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Magnetic profiles obtained during the Hesant 92/93 cruise with the R/V Hesperides show large amplitude anomalies (up to 1000 nT) along a 100 km wide band in the northern margin of the Powell Basin. The anomalies, which are also locally identified in the eastern and western margins, are attributed to the continuation of the two branches of the Antarctic Peninsula Pacific Margin Anomaly (PMA). Interactive modelling of two-dimensional bodies in four profiles oriented NNW-SSE allows us to determine the main features of the magnetic source bodies within the continental crust. These are elongated in a N60/degE trend, and their base is located at a depth exceeding 15 km. Equivalent magnetic susceptibilities mostly between 0.07 and 0.1 (SI) are obtained. These values are consistent with the hypothesis that remanent magnetisation of the magnetic source bodies is sub-parallel to the present geomagnetic field (norÍmally magnetised). The general trends of the bathymetry a nd the geometry of the acoustic basement on multichannel seismic profiles are consistent with the upper surface of magnetic bodies. In order to match the observed anomalies it is also necessary to consider a second tabular shaped body with induced magnetisation in almost all the profiles, which could represent layers 2 and 3 of the oceanic crust of the Powell Basin. Three different geometries of connection between the anomalies in the Powell Basin margins and the PMA branches are discussed. The most plausible one is the occurrence of two branches, although they are closer together than in the Bransfield Strait. The northern branch would continue along the fragments of continental crust of the South Scotia Ridge located at the northern boundary of the Powell Basin, whereas the southern branch would be located only in the eastern and western passive margins of the Powell Basin. The apparent splitting of the southern branch of the anomalous body indicates that it was emplaced before Oligo cene times, when the opening of this basin occurred, and that it was subsequently fragmented during the Cenozoic. A possible time of formation of the PMA body would be during the long Cretaceous normal polarity interval, which also coincides with a peak in magmatic activity along the Antarctic Peninsula.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004240931967
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  • 7
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    Episodicity of Mesozoic terrane accretion along the Pacific margin of Gondwana: implications for superplume-plate interactions (2007)
    In:  Geological Society Special Publication 246: 143-178.
    Details
    Publication Date: 2007-10-08
    Description: A review of evidence for deformation and terrane accretion on the Late Triassic-Early Jurassic margins of Pangaea and the mid-Cretaceous margins of the palaeo-Pacific ocean shows that deformation was global and synchronous with probable superplume events. Late Triassic-Early Jurassic deformation appears to be concentrated in the period 202-197 Ma and was coeval with eruption of the Central Atlantic Magmatic Province, onset of Pangaea break-up, a period of extended normal magnetic polarity and a major mass extinction event, all possible expressions of a superplume event. Mid-Cretaceous deformation occurred in two brief periods, the first from approximately 116 Ma to 110 Ma in the west palaeo-Pacific and the second from roughly 105 Ma to 99 Ma in the east palaeo-Pacific, with both events possibly represented in northeast Siberia. This deformation was coeval with eruption of major oceanic plateaux, core-complex formation and rifting of New Zealand from Gondwana, the Cretaceous normal polarity epoch, and a major radiation of flowering plants and several animal groups, all linked with the mid-Cretaceous superplume event. A simple unifying mechanism is presented suggesting that large continental or oceanic plates, when impacted by a superplume, tend to break-up/reorganize, associated with gravitational spreading away from a broad, thermally generated topographic high and with a resulting short-lived pulse of plate-marginal deformation and terrane accretion.
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  • 8
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    Resolved spectroscopy of gravitationally lensed galaxies: global dynamics and star-forming clumps on ~100 pc scales at 1 〈 z 〈 4 (2015)
    Oxford University Press
    Details
    Publication Date: 2015-05-01
    Description: We present adaptive optics-assisted integral field spectroscopy around the Hα or Hβ lines of 12 gravitationally lensed galaxies obtained with VLT/SINFONI, Keck/OSIRIS and Gemini/NIFS. We combine these data with previous observations and investigate the dynamics and star formation properties of 17 lensed galaxies at 1 〈  z  〈 4. Thanks to gravitational magnification of 1.4–90 times by foreground clusters, effective spatial resolutions of 40–700 pc are achieved. The magnification also allows us to probe lower star formation rates (SFRs) and stellar masses than unlensed samples; our target galaxies feature dust-corrected SFRs derived from Hα or Hβ emission of ~0.8–40 M  yr –1 , and stellar masses M *  ~ 4 10 8 –6 10 10  M . All of the galaxies show velocity gradients, with 59 per cent consistent with being rotating discs and a likely merger fraction of 29 per cent, with the remaining 12 per cent classed as ‘undetermined’. We extract 50 star-forming clumps with sizes in the range 60 pc–1 kpc from the Hα (or Hβ) maps, and find that their surface brightnesses, clump and their characteristic luminosities, L 0 , evolve to higher luminosities with redshift. We show that this evolution can be described by fragmentation on larger scales in gas-rich discs, and is likely to be driven by evolving gas fractions.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 9
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    Mass and magnification maps for the Hubble Space Telescope Frontier Fields clusters: implications for high-redshift studies (2014)
    Oxford University Press
    Details
    Publication Date: 2014-08-16
    Description: Extending over three Hubble Space Telescope ( HST ) cycles, the Hubble Frontier Fields (HFF) initiative constitutes the largest commitment ever of HST time to the exploration of the distant Universe via gravitational lensing by massive galaxy clusters. Here, we present models of the mass distribution in the six HFF cluster lenses, derived from a joint strong- and weak-lensing analysis anchored by a total of 88 multiple-image systems identified in existing HST data. The resulting maps of the projected mass distribution and of the gravitational magnification effectively calibrate the HFF clusters as gravitational telescopes. Allowing the computation of search areas in the source plane, these maps are provided to the community to facilitate the exploitation of forthcoming HFF data for quantitative studies of the gravitationally lensed population of background galaxies. Our models of the gravitational magnification afforded by the HFF clusters allow us to quantify the lensing-induced boost in sensitivity over blank-field observations and predict that galaxies at z  〉 10 and as faint as m(AB) = 32 will be detectable, up to 2 mag fainter than the limit of the Hubble Ultra Deep Field .
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 10
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    The minimum halo mass for star formation at z = 6-8 (2016)
    Oxford University Press
    Details
    Publication Date: 2016-10-28
    Description: Recent analysis of strongly lensed sources in the Hubble Frontier Fields indicates that the rest-frame UV luminosity function of galaxies at z  = 6–8 rises as a power law down to M UV  = –15, and possibly as faint as –12.5. We use predictions from a cosmological radiation hydrodynamic simulation to map these luminosities on to physical space, constraining the minimum dark matter halo mass and stellar mass that the Frontier Fields probe. While previously published theoretical studies have suggested or assumed that early star formation was suppressed in haloes less massive than 10 9 –10 11 M , we find that recent observations demand vigorous star formation in haloes at least as massive as (3.1, 5.6, 10.5) x 10 9 M at z  = (6, 7, 8). Likewise, we find that Frontier Fields observations probe down to stellar masses of (8.1, 18, 32) x 10 6 M : that is, they are observing the likely progenitors of analogues to Local Group dwarfs such as Pegasus and M32. Our simulations yield somewhat different constraints than two complementary models that have been invoked in similar analyses, emphasizing the need for further observational constraints on the galaxy–halo connection.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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