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  • 1
    Call number: 9/M 07.0421(368)
    In: Geological Society special publication
    Description / Table of Contents: Glaciogenic reservoirs and hydrocarbon systems occur intermittently throughout the stratigraphic record, with particular prominence in Neoproterozoic, Late Ordovician, Permo-Carboniferous and Late Cenozoic strata. Recent interest in glaciogenic successions has been fuelled by hydrocarbon discoveries in ancient glaciogenic reservoirs in North Africa, the Middle East, Australia and South America. Glaciogenic deposits of Pleistocene age are noteworthy for their content of groundwater onshore and potentially prospective and/or hazardous gas accumulations offshore. The abundant imprints of Pleistocene glaciations in both hemispheres can be used to reconstruct complex histories of repeated ice cover and retreat, and glacier-bed interactions, thus informing our view on the dynamics of older ice caps and predictions of future glaciations. This volume aims to provide a better understanding of glaciogenic processes, their stratigraphic record and reservoir characteristics of glaciogenic deposits. The book comprises 3 overview papers and 16 original case studies of Neoproterozoic to Pleistocene successions on 6 continents and will be of interest to sedimentologists, glaciologists, geophysicists, hydrologists and petroleum geologists alike.
    Type of Medium: Monograph available for loan
    Pages: 401 S., Ill., graph. darst.
    ISBN: 9781862393486
    Series Statement: Geological Society special publication 368
    Classification:
    Deposits
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    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
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
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  • 3
    Description / Table of Contents: Microbial carbonates (microbialites) are remarkable sedimentary deposits. They have the longest geological range of any type of biogenic limestones, form in the greatest range of different sedimentary environments, oxygenated the Earth's atmosphere and produce and, furthermore, store large volumes of hydrocarbons. This Special Publication provides significant contributions at a pivotal time in our understanding of microbial carbonates when their economic importance has become established and the results of many research programmes are coming to fruition. It is the first book to focus on the economic aspects of microbialites and in particular the giant pre-salt discoveries offshore Brazil. The volume contains papers on the processes involved in the formation of both ancient and modern microbialites and the diversity of style in microbial carbonate build-ups. Structures and fabrics from both marine and non-marine settings are discussed from throughout the geological record.
    Pages: Online-Ressource (VII, 308 Seiten)
    ISBN: 9781862397279
    Language: English
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  • 4
    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
    Language: English
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  • 5
    Publication Date: 2012-12-11
    Description: Glaciogenic reservoirs host important hydrocarbon and groundwater resources across the globe. Their complexity and importance for exploration and palaeoclimate reconstruction have made glaciogenic successions popular subjects for study. In this paper we provide an overview of the palaeoclimatic and tectonic setting for Earth glaciation and a chronological account of glaciogenic deposits since c. 750 Ma, with particular emphasis on their reservoir potential and associated hydrocarbon systems. Hydrocarbon accumulations within glaciogenic reservoirs occur principally in Palaeozoic (Late Ordovician and Permo-Carboniferous) sandstones in South America, Australia, North Africa and the Middle East, with relatively minor occurrences of shallow gas hosted in Pleistocene deposits in the North Sea and Canada. Groundwater reserves occur within glaciogenic sandstones across the northern European lowland and in North America. The main glaciogenic environments range from subglacial to glacier front to proglacial and deglacial. Rapidly changing environments, hydrodynamic regimes and glacier-front and subglacial deformation often result in very complex glaciogenic sequences with significant challenges for reconstruction of their origin and resource importance, which this volume seeks to address.
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  • 6
    Publication Date: 2016-05-04
    Description: Composite hematite–silica structures recovered from a siltstone bed in the Elatina Formation of South Australia include (1) sub-circular to whorl-shaped forms, (2) elongate to half-moon-shaped forms and (3) and lozenge-shaped forms locally linked into chains. They range from 200 to 500 µm in diameter and are interpreted as eukaryote tests. Evidence for internal etching of a calcite core of some tests indicates that at least some of the hematite–silica fabrics were acquired through replacement. Carbon isotope values of –20 13 C are suggestive of precipitation by microbial activity, and imply a change in ambient fluid chemistry associated with a pH reduction. The tests occur within sandstone beds that were deposited on a tidally modulated braidplain during the Marinoan glaciation at the end of the Cryogenian. The quartz grains in the sandstone sample lack the typical textures (surface striae, internal fractures or irregular grain boundaries) expected for glacially transported material. Thus, on textural grounds we argue that the eukaryote tests represent a proglacial ecosystem during a late Cryogenian snowball Earth event. Supplementary material: Video files of digital X-ray tomographs (μCT) in the longitudinal and transverse planes are available at: https://doi.org/10.6084/m9.figshare.c.2209723 .
    Print ISSN: 0016-7649
    Topics: Geosciences
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  • 7
    Publication Date: 2015-05-10
    Description: Extract Microbial carbonates (microbialites) are remarkable sedimentary deposits for four good reasons: they have the longest geological range of any type of biogenic limestones; they form in the greatest range of different sedimentary environments; they oxygenated the Earth's atmosphere; and they produce and store large volumes of hydrocarbons. However, they are amongst the most intractable of sedimentary rocks to study, as, being formed by the action or influence of microbes, they do not always preserve direct, or diagenetically robust, evidence for their mode of formation. ... This 250-word extract was created in the absence of an abstract.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 8
    Publication Date: 2015-04-26
    Description: Outstanding exposures of Ediacaran-aged thrombolite–stromatolite bioherms and biostromes crop out in the Nama Basin, SW Namibia. Fieldwork, dovetailed with remote sensing and a terrestrial laser scanning (LiDAR) survey, allow the fracture network of this succession to be characterized, and the relative age of fracture sets and families to be determined. The results show that the microbial carbonates were affected by intense syndepositional brittle and ductile deformation. Early brittle fracturing was favoured where early lithification of microbialites took place upon deposition. Such deposits were prone to gravitational collapse due to internal weaknesses during early lithification. Timing of syndepositional fracturing of bioherms and biostromes is demonstrated by contemporaneous microbial overgrowth over brecciated material in open-mode fractures. Ductile deformation occurs preferentially around massive thrombolite domes and columns, represented by folding of mud-dominated sediments in inter-column fill. Secondary fractures developed during the long-lived structural history of the Nama Basin, resulting in a complex fracture network of syndepositional fractures overprinted by secondary fractures. These findings have important implications for carbonate reservoir characterization in microbial reservoirs and subsurface fluid-flow estimations. The observed syndepositional fractures form due to body forces that are intrinsic to the microbial system and thus do not require an external tectonic driver.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 9
    Publication Date: 2014-04-25
    Description: The Cryogenian record of South Australia includes the type region of the Sturtian glaciation, the oldest of three pan-global icehouse intervals during the Neoproterozoic. Data are presented from previously little described sections at Holowilena Creek, Oladdie Creek and Hillpara Creek in the central and southern Flinders Ranges, where five facies associations are recognized. These are (1) diamictite and conglomerate, (2) interbedded heterolithic deposits, (3) hummocky cross-stratified sandstone, (4) lonestone-bearing siltstone, and (5) ferruginous siltstone and sandstone. The succession reveals significant lateral and vertical facies variation, which is linked to a complex inherited palaeotopography and distance from the sediment source. Repeated stratigraphic occurrences of striated clasts and abundant ice-rafted debris strongly support recurrent glacial influence on sedimentation. The intercalation of gravitationally reworked diamictites, dropstone-bearing siltstone and dropstone-free siltstone testifies to dynamic sedimentation within a periodically glacially influenced subaqueous environment. Sequence stratigraphic analysis identifies four glacial advance systems tracts, separated by three glacial retreat systems tracts, wherein hummocky cross-stratified sandstones attest to open water conditions. These findings support dynamic ice sheet behaviour in South Australia, and provide clear evidence for repeated intra-Sturtian ice sheet recession.
    Print ISSN: 0016-7649
    Topics: Geosciences
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  • 10
    Publication Date: 2014-07-01
    Description: The Kingston Peak Formation is a diamictite-bearing succession that crops out in the Death Valley region, California, USA. An exceptionally thick (〉1.5 km) outcrop belt in its type area (the Kingston Range) provides clear insights into the dynamics of mid-Cryogenian (‘Sturtian’) ice sheets in Laurentia. Seven detailed logs allow the lateral and vertical distribution of facies associations to be assessed. We recognize (1) diamictite facies association (ice-proximal glacigenic debris flows), (2) lonestone-bearing facies association (ice-marginal hemipelagic deposits and low-density gravity flows with iceberg rafting), (3) pebble to boulder conglomerate facies association (ice-proximal cogenetic glacigenic debris flows and high-density turbidites), (4) megaclast facies association (olistostrome and hemipelagic sediments subject to ice-rafting), and (5) interbedded heterolithics facies association (low-density turbidites and hemipelagic deposits). The stratigraphic motif allows three glacial cycles to be inferred across the range. Ice-minimum conditions interrupting the Kingston Peak succession are associated with the development of an olistostrome complex, succeeded by a thick accumulation of boulder conglomerates deposited during ice readvance. The data testify to a strong glacial influence on sedimentation within this ancient subaqueous succession, and to highly dynamic ice sheet behaviour with clear glacial cycles during the Sturtian glaciation.
    Print ISSN: 0016-7649
    Topics: Geosciences
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