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  • 1
    Call number: 9/M 02.0230
    In: Geological Society special publication
    Type of Medium: Monograph available for loan
    Pages: 473 S.
    ISBN: 1862390878
    Series Statement: Geological Society special publication 188
    Classification:
    A. 3.7.
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Description / Table of Contents: Ireland is virtually encircled by sedimentary basins which developed in response to periods of rifting and thermal subsidence. These offshore basins have been the focus of intermittent phases of exploration since drilling of the first well in 1970 and, to date, 136 wells have been drilled. Most of the drilling so far has concentrated on structural traps, but recent exploration has begun to focus on a variety of stratigraphic traps, with greater emphasis on results obtained from studies of the Atlantic margin basins. The Petroleum Exploration of Ireland's Offshore Basins contains a set of 27 papers on a wide range of topics relating to recent exploration of the Irish offshore sedimentary basins. These papers address aspects of the structural and stratigraphic evolution, thermal history, petroleum systems, reservoir geology and sea-bed processes in the Irish offshore area. Although the main focus is on petroleum systems and those issues bearing on exploration risk, the exploration effort has yielded fundamental new insight into the wider development of starved passive continental margins. The volume will be of interest to oil industry explorationists and researchers focusing on NW European sedimentary basins and the evolution of the Irish Atlantic margin.
    Pages: Online-Ressource (473 Seiten)
    ISBN: 1862390878
    Language: English
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  • 3
    Keywords: Sedimentologie ; Sedimentgesteine ; Sedimentary rocks ; Petrogenesis
    Description / Table of Contents: P. D. W. Haughton, S. P. Todd, and A. C. Morton: Sedimentary provenance studies / Geological Society, London, Special Publications, 57:1-11, doi:10.1144/GSL.SP.1991.057.01.01 --- P. Allen: Provenance research: Torridonian and Wealden / Geological Society, London, Special Publications, 57:13-21, doi:10.1144/GSL.SP.1991.057.01.02 --- Gian Gaspare Zuffa: On the use of turbidite arenites in provenance studies: critical remarks / Geological Society, London, Special Publications, 57:23-29, doi:10.1144/GSL.SP.1991.057.01.03 --- Andrew C. Morton: Geochemical studies of detrital heavy minerals and their application to provenance research / Geological Society, London, Special Publications, 57:31-45, doi:10.1144/GSL.SP.1991.057.01.04 --- Amparo Tortosa, Marta Palomares, and José Arribas: Quartz grain types in Holocene deposits from the Spanish Central System: some problems in provenance analysis / Geological Society, London, Special Publications, 57:47-54, doi:10.1144/GSL.SP.1991.057.01.05 --- Abhijit Basu and Emanuela Molinaroli: Reliability and application of detrital opaque Fe-Ti oxide minerals in provenance determination / Geological Society, London, Special Publications, 57:55-65, doi:10.1144/GSL.SP.1991.057.01.06 --- Anthony J. Hurford and Andrew Carter: The role of fission track dating in discrimination of provenance / Geological Society, London, Special Publications, 57:67-78, doi:10.1144/GSL.SP.1991.057.01.07 --- D. J. Batten: Reworking of plant microfossils and sedimentary provenance / Geological Society, London, Special Publications, 57:79-90, doi:10.1144/GSL.SP.1991.057.01.08 --- Michael A. Velbel and Mounir K. Saad: Palaeoweathering or diagenesis as the principal modifier of sandstone framework composition? A case study from some Triassic rift-valley redbeds of eastern North America / Geological Society, London, Special Publications, 57:91-99, doi:10.1144/GSL.SP.1991.057.01.09 --- A. E. Milodowski and J. A. Zalasiewicz: Redistribution of rare earth elements during diagenesis of turbidite/hemipelagite mudrock sequences of Llandovery age from central Wales / Geological Society, London, Special Publications, 57:101-124, doi:10.1144/GSL.SP.1991.057.01.10 --- R. Valloni, D. Lazzari, and M. A. Calzolari: Selective alteration of arkose framework in Oligo-Miocene turbidites of the Northern Apennines foreland: impact on sedimentary provenance analysis / Geological Society, London, Special Publications, 57:125-136, doi:10.1144/GSL.SP.1991.057.01.11 --- R. A. Cliff, S. E. Drewery, and M. R. Leeder: Sourcelands for the Carboniferous Pennine river system: constraints from sedimentary evidence and U-Pb geochronology using zircon and monazite / Geological Society, London, Special Publications, 57:137-159, doi:10.1144/GSL.SP.1991.057.01.12 --- Jane A. Evans, Philip Stone, and James D. Floyd: Isotopic characteristics of Ordovician greywacke provenance in the Southern Uplands of Scotland / Geological Society, London, Special Publications, 57:161-172, doi:10.1144/GSL.SP.1991.057.01.13 --- P. A. Floyd, R. Shail, B. E. Leveridge, and W. Franke: Geochemistry and provenance of Rhenohercynian synorogenic sandstones: implications for tectonic environment discrimination / Geological Society, London, Special Publications, 57:173-188, doi:10.1144/GSL.SP.1991.057.01.14 --- Christopher M. Gerrard: Sedimentary petrology and the archaeologist: the study of ancient ceramics / Geological Society, London, Special Publications, 57:189-197, doi:10.1144/GSL.SP.1991.057.01.15 --- John R. Graham, John P. Wrafter, Stephen Daly, and Julian F. Menuge: A local source for the Ordovician Derryveeny Formation, western Ireland: implications for the Connemara Dalradian / Geological Society, London, Special Publications, 57:199-213, doi:10.1144/GSL.SP.1991.057.01.16 --- T. McCann: Petrological and geochemical determination of provenance in the southern Welsh Basin / Geological Society, London, Special Publications, 57:215-230, doi:10.1144/GSL.SP.1991.057.01.17 --- Duncan Pirrie: Controls on the petrographic evolution of an active margin sedimentary sequence: the Larsen Basin, Antarctica / Geological Society, London, Special Publications, 57:231-249, doi:10.1144/GSL.SP.1991.057.01.18 --- Bernard Humphreys, Andrew C. Morton, Claire R. Hallsworth, Robert W. Gatliff, and James B. Riding: An integrated approach to provenance studies: a case example from the Upper Jurassic of the Central Graben, North Sea / Geological Society, London, Special Publications, 57:251-262, doi:10.1144/GSL.SP.1991.057.01.19 --- José Arribas and M. Eugenia Arribas: Petrographic evidence of different provenance in two alluvial fan systems (Palaeogene of the northern Tajo Basin, Spain) / Geological Society, London, Special Publications, 57:263-271, doi:10.1144/GSL.SP.1991.057.01.20 --- I. R. Garden: Changes in the provenance of pebbly detritus in southern Britain and northern France associated with basin rifting / Geological Society, London, Special Publications, 57:273-289, doi:10.1144/GSL.SP.1991.057.01.21 --- Gary Nichols, Kusnama, and Robert Hall: Sandstones of arc and ophiolite provenance in backarc basin, Halmahera, eastern Indonesia / Geological Society, London, Special Publications, 57:291-303, doi:10.1144/GSL.SP.1991.057.01.22 --- Peter A. Cawood: Nature and record of igneous activity in the Tonga arc, SW Pacific, deduced from the phase chemistry of derived detrital grains / Geological Society, London, Special Publications, 57:305-321, doi:10.1144/GSL.SP.1991.057.01.23 --- Martin J. Evans and Maria A. Mange-Rajetzky: The provenance of sediments in the Barrême thrust-top basin, Haute-Provence, France / Geological Society, London, Special Publications, 57:323-342, doi:10.1144/GSL.SP.1991.057.01.24 --- Simon J. Cuthbert: Evolution of the Devonian Hornelen Basin, west Norway: new constraints from petrological studies of metamorphic clasts / Geological Society, London, Special Publications, 57:343-360, doi:10.1144/GSL.SP.1991.057.01.25
    Pages: Online-Ressource (370 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 0903317567
    Language: English
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  • 4
    Keywords: mass movements; landslides
    Description / Table of Contents: Introduction --- Subaqueous mass movements in the context of observations of contemporary slope failure / Joshu J. Mountjoy, Aggeliki Georgiopoulou, Jason Chaytor, Michael A. Clare, Davide Gamboa and Jasper Moernaut / Geological Society, London, Special Publications, 500, 1-12, 26 May 2020, https://doi.org/10.1144/SP500-2019-237 --- Section A: consequences and implications --- Revisiting the tsunamigenic volcanic flank collapse of Fogo Island in the Cape Verdes, offshore West Africa / Rachel Barrett, Elodie Lebas, Ricardo Ramalho, Ingo Klaucke, Steffen Kutterolf, Andreas Klügel, Katja Lindhorst, Felix Gross and Sebastian Krastel / Geological Society, London, Special Publications, 500, 13-26, 13 March 2020, https://doi.org/10.1144/SP500-2019-187 --- The sedimentology and tsunamigenic potential of the Byron submarine landslide off New South Wales, Australia / Kendall C. Mollison, Hannah E. Power, Samantha L. Clarke, Alan T. Baxter, Emily M. Lane and Thomas C. T. Hubble / Geological Society, London, Special Publications, 500, 27-40, 7 April 2020, https://doi.org/10.1144/SP500-2019-160 --- Effects of rotational submarine slump dynamics on tsunami genesis: new insight from idealized models and the 1929 Grand Banks event / T. Zengaffinen, F. Løvholt, G. K. Pedersen and C. B. Harbitz / Geological Society, London, Special Publications, 500, 41-61, 11 May 2020, https://doi.org/10.1144/SP500-2019-201 --- A scenario-based assessment of the tsunami hazard in Palermo, northern Sicily, and the southern Tyrrhenian Sea / Jack Dignan, Aaron Micallef, Christof Mueller, Attilio Sulli, Elisabetta Zizzo and Daniele Spatola / Geological Society, London, Special Publications, 500, 63-80, 31 March 2020, https://doi.org/10.1144/SP500-2019-181 --- A workflow for the rapid assessment of the landslide-tsunami hazard in peri-alpine lakes / Michael Strupler, Flavio S. Anselmetti, Michael Hilbe, Katrina Kremer and Stefan Wiemer / Geological Society, London, Special Publications, 500, 81-95, 18 March 2020, https://doi.org/10.1144/SP500-2019-166 --- Towards a national-scale assessment of the subaqueous mass movement hazard in Canada / D. Gwyn Lintern, Jessica Rutherford, Philip R. Hill, Calvin Campbell and Alexandre Normandeau / Geological Society, London, Special Publications, 500, 97-113, 11 May 2020, https://doi.org/10.1144/SP500-2019-206 --- Structural constraints on the subduction of mass-transport deposits in convergent margins / Jacob Geersen, Andrea Festa and Francesca Remitti / Geological Society, London, Special Publications, 500, 115-128, 13 March 2020, https://doi.org/10.1144/SP500-2019-174 --- Evaluating the sealing potential of young and thin mass-transport deposits: Lake Villarrica, Chile / Jasper Moernaut, Gauvain Wiemer, Achim Kopf and Michael Strasser / Geological Society, London, Special Publications, 500, 129-146, 13 March 2020, https://doi.org/10.1144/SP500-2019-155 --- Influence of mass transport deposit (MTD) surface topography on deep-water deposition: an example from a predominantly fine-grained continental margin, New Zealand / Suzanne Bull, Greg H. Browne, Malcolm J. Arnot and Lorna J. Strachan / Geological Society, London, Special Publications, 500, 147-171, 28 April 2020, https://doi.org/10.1144/SP500-2019-192 --- Section B: initiation, triggers and preconditioning --- A multi-disciplinary investigation of the AFEN Slide: the relationship between contourites and submarine landslides / Ricarda Gatter, Michael A. Clare, James E. Hunt, Millie Watts, B. N. Madhusudhan, Peter J. Talling and Katrin Huhn / Geological Society, London, Special Publications, 500, 173-193, 28 April 2020, https://doi.org/10.1144/SP500-2019-184 --- Indonesian Throughflow as a preconditioning mechanism for submarine landslides in the Makassar Strait / Rachel E. Brackenridge, Uisdean Nicholson, Benyamin Sapiie, Dorrik Stow and Dave R. Tappin / Geological Society, London, Special Publications, 500, 195-217, 1 April 2020, https://doi.org/10.1144/SP500-2019-171 --- Morphological signature of gully development by rapid slide retrogression in a layered coarse-grained delta foreslope / Jacques Locat, Ali Azizian, Jim Stronach, Aurélien Hospital, Chris Young, Dominique Turmel and Andrew Bevan / Geological Society, London, Special Publications, 500, 219-234, 13 March 2020, https://doi.org/10.1144/SP500-2019-159 --- Morphology and spatio-temporal distribution of lacustrine mass-transport deposits in Wörthersee, Eastern Alps, Austria / Christoph Daxer, Maddalena Sammartini, Ariana Molenaar, Thomas Piechl, Michael Strasser and Jasper Moernaut / Geological Society, London, Special Publications, 500, 235-254, 19 March 2020, https://doi.org/10.1144/SP500-2019-179 --- A numerical investigation of excess pore pressures and continental slope stability in response to ice-sheet dynamics / Morelia Urlaub, Isabel Kratzke and Berit Oline Hjelstuen / Geological Society, London, Special Publications, 500, 255-266, 13 March 2020, https://doi.org/10.1144/SP500-2019-185 --- Impact of sea-level fluctuations on the sedimentation patterns of the SE African margin: implications for slope instability / Aaron Micallef, Aggeliki Georgiopoulou, Andrew Green and Vittorio Maselli / Geological Society, London, Special Publications, 500, 267-276, 13 March 2020, https://doi.org/10.1144/SP500-2019-172 --- Geomechanical behaviour of gassy soils and implications for submarine slope stability: a literature analysis / P. Kaminski, M. Urlaub, J. Grabe and C. Berndt / Geological Society, London, Special Publications, 500, 277-288, 13 March 2020, https://doi.org/10.1144/SP500-2019-149 --- From gravity cores to overpressure history: the importance of measured sediment physical properties in hydrogeological models / Davide Mencaroni, Jaume Llopart, Roger Urgeles, Sara Lafuerza, Eulàlia Gràcia, Anne Le Friant and Morelia Urlaub / Geological Society, London, Special Publications, 500, 289-300, 22 May 2020, https://doi.org/10.1144/SP500-2019-176 --- The influence of clay content on submarine slope failure: insights from laboratory experiments and numerical models / M. M. W. Silver and B. Dugan / Geological Society, London, Special Publications, 500, 301-309, 26 March 2020, https://doi.org/10.1144/SP500-2019-186 --- Subduction of an extinct rift and its role in the formation of submarine landslides in NW South America / Carlos A. Vargas, Gustavo A. Gutiérrez and Gustavo A. Sarmiento / Geological Society, London, Special Publications, 500, 311-322, 12 May 2020, https://doi.org/10.1144/SP500-2019-189 --- Section C: characterization and regional controls --- Mass wasting on Alpha Ridge in the Arctic Ocean: new insights from multibeam bathymetry and sub-bottom profiler data / Kai Boggild, David C. Mosher, Paola Travaglini, Catalina Gebhardt and Larry Mayer / Geological Society, London, Special Publications, 500, 323-340, 13 May 2020, https://doi.org/10.1144/SP500-2019-196 --- The Last Glacial Maximum Balearic Abyssal Plain megabed revisited / Antonio Cattaneo, Shray Badhani, Cristina Caradonna, Massimo Bellucci, Estelle Leroux, Nathalie Babonneau, Sébastien Garziglia, Jeffrey Poort, Grigorii G. Akhmanov, Germain Bayon, Bernard Dennielou, Gwenäel Jouet, Sébastien Migeon, Marina Rabineau, Laurence Droz and Michael Clare / Geological Society, London, Special Publications, 500, 341-357, 14 May 2020, https://doi.org/10.1144/SP500-2019-188 --- Integrated geophysical, sedimentological and geotechnical investigation of submarine landslides in the Gulf of Lions (Western Mediterranean) / Shray Badhani, Antonio Cattaneo, Stefano Collico, Roger Urgeles, Bernard Dennielou, Estelle Leroux, Florent Colin, Sebastien Garziglia, Marina Rabineau and Laurence Droz / Geological Society, London, Special Publications, 500, 359-376, 14 May 2020, https://doi.org/10.1144/SP500-2019-175 --- Characterization of recent deep-sea debrites in the eastern Mediterranean based on foraminiferal taphonomy / Oded Katz, Leeron Ashkenazi, Shani Sultan-Levi, Sigal Abramovich, Ahuva Almogi-Labin and Orit Hyams-Kaphzan / Geological Society, London, Special Publications, 500, 377-391, 11 May 2020, https://doi.org/10.1144/SP500-2019-170 --- Widespread mass-wasting processes off NE Sicily (Italy): insights from morpho-bathymetric analysis / Daniele Casalbore, Romano Clementucci, Alessandro Bosman, Francesco Latino Chiocci, Eleonora Martorelli and Domenico Ridente / Geological Society, London, Special Publications, 500, 393-403, 15 May 2020, https://doi.org/10.1144/SP500-2019-195 --- Geomorphology and event-stratigraphy of recent mass-movement processes in Lake Hallstatt (UNESCO World Heritage Cultural Landscape, Austria) / Michael Strasser, T. Berberich, S. Fabbri, M. Hilbe, J-J. S. Huang, S. Lauterbach, M. Ortler, H. Rechschreiter, A. Brauer, F. Anselmetti and K. Kowarik / Geological Society, London, Special Publications, 500, 405-426, 31 March 2020, https://doi.org/10.1144/SP500-2019-178 --- Slope stability hazard in a fjord environment: Douglas Channel, Canada / Cooper D. Stacey, D. Gwyn Lintern, John Shaw and Kim W. Conway / Geological Society, London, Special Publications, 500, 427-451, 20 May 2020, https://doi.org/10.1144/SP500-2019-191 --- Submarine canyons, slope failures and mass transport processes in southern Cascadia / Jenna C. Hill, Janet T. Watt, Daniel S. Brothers and Jared W. Kluesner / Geological Society, London, Special Publications, 500, 453-475, 20 May 2020, https://doi.org/10.1144/SP500-2019-169 --- Tectonic and geomorphic controls on the distribution of submarine landslides across active and passive margins, eastern New Zealand / S. J. Watson, J. J. Mountjoy and G. J. Crutchley / Geological Society, London, Special Publications, 500, 477-494, 13 March 2020, https://doi.org/10.1144/SP500-2019-165 --- Geological and tectonic controls on morphometrics of submarine landslides of the Spanish margins / Ricardo León, Roger Urgeles, Raul Pérez-López, Emilio Payo, Amanda Vázquez-Izquierdo, Carmen Julia Giménez-Moreno and David Casas / Geological Society, London, Special Publications, 500, 495-513, 20 May 2020, https://doi.org/10.1144/SP500-2019-153 --- Section D: mobility and kinematics --- Megaclasts within mass-transport deposits: their origin, characteristics and effect on substrates and succeeding flows / Jefferson Nwoko, Ian Kane and Mads Huuse / Geological Society, London, Special Publications, 500, 515-530, 31 March 2020, https://doi.org/10.1144/SP500-2019-146 --- Line length balancing to evaluate multi-phase submarine landslide development: an example from the Storegga Slide, Norway / Suzanne Bull and Joseph A. Cartwright / Geological Society, London, Special Publications, 500, 531-549, 23 March 2020, https://doi.org/10.1144/SP500-2019-168 --- A new depositional model for the Tuaheni Landslide Complex, Hikurangi Margin, New Zealand / Benjamin Couvin, Aggeliki Georgiopoulou, Joshu J. Mountjoy, Lawrence Amy, Gareth J. Crutchley, Morgane Brunet, Sebastian Cardona, Felix Gross, Christoph Böttner, Sebastian Krastel and Ingo Pecher / Geological Society, London, Special Publications, 500, 551-566, 19 May 2020, https://doi.org/10.1144/SP500-2019-180 --- Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics / Srikumar Roy, Aggeliki Georgiopoulou, Sara Benetti and Fabio Sacchetti / Geological Society, London, Special Publications, 500, 567-586, 18 March 2020, https://doi.org/10.1144/SP500-2019-177 --- Short- and long-term movement of mudflows of the Mississippi River Delta Front and their known and potential impacts on oil and gas infrastructure / Jason D. Chaytor, Wayne E. Baldwin, Samuel J. Bentley, Melanie Damour, Douglas Jones, Jillian Maloney, Michael D. Miner, Jeff Obelcz and Kehui Xu / Geological Society, London, Special Publications, 500, 587-604, 26 March 2020, https://doi.org/10.1144/SP500-2019-183 --- Lessons learned from the monitoring of turbidity currents and guidance for future platform designs / Michael Clare, D. Gwyn Lintern, Kurt Rosenberger, John E. Hughes Clarke, Charles Paull, Roberto Gwiazda, Matthieu J. B. Cartigny, Peter J. Talling, Daniel Perara, Jingping Xu, Daniel Parsons, Ricardo Silva Jacinto and Ronan Apprioual / Geological Society, London, Special Publications, 500, 605-634, 22 May 2020, https://doi.org/10.1144/SP500-2019-173
    Pages: Online-Ressource (VII, 639 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781786204776
    Language: English
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 36 (1989), S. 0 
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Faceted garnets from a wide range of geological ages, environments and locations have been studied in polished grain mounts by a combination of backscattered electron microscopy and elemental mapping using energy-dispersive X-ray analysis. In all cases, the areas apparently showing positive relief on the faceted garnet surfaces are compositionally identical to the adjacent grain cores despite a wide variation in detrital garnet compositions. In one case, zoning within the grain core can be traced into the faceted areas on the grain surface. Thus, faceted areas must be considered to form part of the original detrital grains. Together with previously published studies on experimental garnet etching, thermodynamic conditions for garnet growth, textural relationships between faceted garnets and authigenic and detrital phases, and distribution of faceted garnets in the subsurface, this paper provides conclusive proof that faceted garnet surfaces form as a result of dissolution, not overgrowth.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2008-01-02
    Description: A range of unfaulted and faulted bed-scale models with sheet-like or lobate bed geometries and faults of comparable sizes to beds have been built and analysed in terms of bed connectivity and fractional permeability assuming permeable sands and impermeable shales and shale smears. A new method has been devised allowing amalgamation ratio to be included explicitly as model input and this property, rather than net:gross ratio, is found to be the dominant control on the connectivity of unfaulted sequences. At the geometrically representative scales considered (horizontal distances of 〉1 km for beds up to c. 1 m thick and faults up to c. 5 m throw), faulted sequences rarely have lower connectivities than their unfaulted sedimentological equivalents irrespective of whether fault rock properties are included. Models containing stochastically placed shale smears associated with each faulted shale horizon are generally better connected than if deterministic Shale Gouge Ratio cut-offs are applied. Despite the complex interactions between geological input and connectivity of the faulted sequences, the flow properties at representative scales are controlled by three geometrical variables describing connectivity, anisotropy and resolution. If two different faulted or unfaulted systems have identical values of these three variables they will have the same equivalent flow properties.
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  • 7
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    In:  Geological Society Special Publication 188: 1-8.
    Publication Date: 2001-01-01
    Description: Ireland is virtually encircled by sedimentary basins (Fig. 1) that developed in response to a series of rift episodes interspersed with periods of thermal subsidence. A number of inversion episodes also played a role in the development of sediment source areas and in the structuring of the basins. These basins can be categorized into two groups. The first comprises the basins of Northern Ireland, the Irish Sea and Celtic Sea areas, and the inboard basins (Slyne, Erris and Donegal basins) of the Atlantic margin. They generally have a NE-SW elongate morphology and typically lie within 100km of the shore. Their sedimentary fill is predominantly of pre-Tertiary age and they have no major bathymetric expression. The second group, comprising the outboard basins of the Atlantic margin (Goban Spur, Porcupine, Rockall and Hatton basins), lies in deep water. These basins are characterized by having an extensive surface area, typically containing a predominantly Cretaceous and Tertiary succession and having an underfilled sedimentary character. The Irish offshore basins have been the focus of intermittent phases of exploration since the first well was drilled in 1970. To date, a total of 136 wells has been drilled (Fig. 2) with 37 of these in the basins west of Ireland. The total cost of wells in the Irish offshore, in 2001 prices, is approximately IR {pound}1500 million. A significant amount of 2D reflection seismic data has been acquired (Fig. 3), both as speculative and proprietary surveys. Two commercial gas fields (Kinsale Head and Ballycotton) are currently in ... This 250-word extract was created in the absence of an abstract.
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  • 8
    Publication Date: 2012-05-12
    Description: Pb isotopic data from K-feldspars in Middle Triassic (Anisian) sandstones in the Wessex Basin, onshore SW UK, and the East Irish Sea Basin, some 350 km to the north, show that the same grain populations are present. This indicates that the drainage system (the ‘Budleighensis’ river) feeding these basins originated from the same source/s, most probably the remnant Variscan uplands to the south. Fluvial and aeolian sandstones have the same provenance, suggesting that if water- and wind-driven sands were originally derived from different sources, this has been obscured through reworking prior to final deposition. Significant recycling of feldspar from arkosic sandstones in earlier sedimentary basins can be ruled out. The provenance data agree with previous depositional models, indicating transport distances in excess of 400 km, with a drainage pattern that linked separate basins. This supports the idea that the regional fluvial system was driven by topography and episodic flooding events of sufficient magnitude to overcome evaporation and infiltration over hundreds of kilometres. Importantly, this drainage system appears to have been isolated and independent from those operating contemporaneously to the NW of the Irish and Scottish massifs, where the remnant Variscan uplands apparently exerted no influence on drainage or sand supply.
    Print ISSN: 0016-7649
    Topics: Geosciences
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  • 9
    Publication Date: 2014-05-24
    Description: A bstract :  Hybrid event beds are now recognized as an important component of many deep-sea fan and sheet systems. They are interpreted to record the passage of rheologically complex sediment gravity currents (hybrid flows) that comprise turbulent, transitional, and/or laminar zones. Hitherto, the development of hybrid flow character has mainly been recognized in system fringes and attributed to distal and lateral flow transformations and/or declining turbulence energy expressed over lateral scales of several kilometers or more. However, new field data show that deposition from hybrid flows can occur relatively proximally, where flows meet confining topography. Turbidity currents primed to transform to hybrid flows by up-dip erosion and incorporation of clay may be forced to do so by rapid, slope-induced decelerations within 1 km of the slope. Local flow transformation and deposition of hybrid event-beds offer an alternative explanation for unusual facies developed at the foot of flow-confining seafloor slopes.
    Print ISSN: 1527-1404
    Topics: Geosciences
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  • 10
    Publication Date: 2015-08-25
    Description: :  Sea-floor topography can constrict, deflect, or reflect turbidity currents resulting in a range of distinctive deposits. Where flows rebound off slopes and a suspension cloud collects in an enclosed basin, ponded or contained turbidites are deposited. Ponded turbidites have been widely recognized in slope mini-basins and on small, structurally confined basin floors in strike-slip and foreland-basin settings. They can have a variable internal structure the significance of which remains poorly understood in terms of flow behavior. New experiments demonstrate that the ponding process can comprise up to four phases: 1) cloud establishment, 2) inflation, 3) steady-state maintenance, and 4) collapse. The experiments explored the behavior of sustained turbidity currents draining into small basins and show that the ponded suspensions that form are characterized by an important internal interface; this divides a lower outbound-moving layer from an upper return layer. The basal layer evolves to constant concentration and grain size, whereas the upper layer is graded (concentration and grain size decrease upward). During the cloud inflation stage, the concentration and velocity profiles of the ponded suspension evolve, and this phase can dominate the resulting deposit. Outbound internal waves can travel along the interface between the outbound and return layers and impinge against the confining slope, and their amplitude is highest when the density contrast between layers is greatest, e.g., when the input flows are thin and dense. The experiments show that flow reversals can arise in several ways (initial rebound, episodic collapse of the wedge of fluid above the counter slope, "grounding" of the internal velocity interface) and that despite steady input, velocities decay and the deposit grades upwards. Internal waves emanate from the input point, i.e., do not form as reflections off the counter slope. The internal grain-size interface within the suspension may dictate textural trends in sands onlapping the confining slopes. Where flows are partially ponded, internal waves can generate pulsing overspill to basins down dip.
    Print ISSN: 1527-1404
    Topics: Geosciences
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