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  • 1
    Description / Table of Contents: The superposition of stratified rocks is an unmistakable manifestation of the history of sedimentary processes through deep time. However, the relationship between the preserved strata of the rock record and the passage of geological time, indisputable in principle, is unknowable in detail; incompleteness is an essential property of the record. That gaps exist at all scales in sedimentary successions is easily demonstrated from consideration of sediment accumulation rates, and expectations of continuity and completeness at any scale are correspondingly inadvisable. Locating and quantifying the gaps in the record is, however, very much less straightforward. Predictive modelling of strata – essential for their practical exploitation – requires such geohistorical understanding, yet over-simplified assumptions about how time is represented in rock can still lead to inadequate or even false conclusions. The contributions to this volume describe a range of practical studies, theoretical investigations, and numerical experiments in which the nature of the strata–time relationship is explored.
    Pages: Online-Ressource (VII, 325 Seiten)
    ISBN: 9781862396555
    Language: English
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  • 2
    Keywords: Südostasien ; Erdölgeologie ; Erdöl ; fossile Brennstoffe ; Geologie ; Kohlenwasserstofflagerstätte ; Geology ; Petroleum ; Southeast Asia
    Description / Table of Contents: A. J. Fraser and S. J. Matthews: Petroleum geology of SE Asia: an introduction / Geological Society, London, Special Publications, 126:1-2, doi:10.1144/GSL.SP.1997.126.01.01 --- Chris Sladen: Energy trends in SE Asia / Geological Society, London, Special Publications, 126:3-10, doi:10.1144/GSL.SP.1997.126.01.02 --- Robert Hall: Cenozoic plate tectonic reconstructions of SE Asia / Geological Society, London, Special Publications, 126:11-23, doi:10.1144/GSL.SP.1997.126.01.03 --- S. P. Todd, M. E. Dunn, and A. J. G. Barwise: Characterizing petroleum charge systems in the tertiary of SE Asia / Geological Society, London, Special Publications, 126:25-47, doi:10.1144/GSL.SP.1997.126.01.04 --- Chris Sladen: Exploring the lake basins of east and southeast Asia / Geological Society, London, Special Publications, 126:49-76, doi:10.1144/GSL.SP.1997.126.01.05 --- Coen T. A. M. Leo: Exploration in the Gulf of Thailand in deltaic reservoirs, related to the Bongkot Field / Geological Society, London, Special Publications, 126:77-87, doi:10.1144/GSL.SP.1997.126.01.06 --- S. J. Matthews, A. J. Fraser, S. Lowe, S. P. Todd, and F. J. Peel: Structure, stratigraphy and petroleum geology of the SE Nam Con Son Basin, offshore Vietnam / Geological Society, London, Special Publications, 126:89-106, doi:10.1144/GSL.SP.1997.126.01.07 --- R. H. Worden, M. J. Mayall, and I. J. Evans: Predicting reservoir quality during exploration: lithic grains, porosity and permeability in Tertiary clastic rocks of the South China Sea basin / Geological Society, London, Special Publications, 126:107-115, doi:10.1144/GSL.SP.1997.126.01.08 --- M. J. Mayall, A. Bent, and D. M. Roberts: Miocene carbonate buildups offshore Socialist Republic of Vietnam / Geological Society, London, Special Publications, 126:117-120, doi:10.1144/GSL.SP.1997.126.01.09 --- A. Wight, H. Friestad, I. Anderson, P. Wicaksono, and C. H. Reminton: Exploration history of the offshore Southeast Sumatra PSC, Java Sea, Indonesia / Geological Society, London, Special Publications, 126:121-142, doi:10.1144/GSL.SP.1997.126.01.10 --- Craig Schiefelbein and Nick Cameron: Sumatra/Java oil families / Geological Society, London, Special Publications, 126:143-146, doi:10.1144/GSL.SP.1997.126.01.11 --- J. M. Cole and S. Crittenden: Early Tertiary basin formation and the development of Lacustrine and quasi-lacustrine/marine source rocks on the Sunda Shelf of SE Asia / Geological Society, London, Special Publications, 126:147-183, doi:10.1144/GSL.SP.1997.126.01.12 --- Alastair Beach, J. Lawson Brown, Paul J. Brockbank, Steven D. Knott, Jean E. McCallum, and Alastair I. Welbon: Fault seal analysis of SE Asian basins with examples from West Java / Geological Society, London, Special Publications, 126:185-194, doi:10.1144/GSL.SP.1997.126.01.13 --- D. J. Prosser and R. R. Carter: Permeability heterogeneity within the Jerudong Formation: an outcrop analogue for subsurface Miocene reservoirs in Brunei / Geological Society, London, Special Publications, 126:195-235, doi:10.1144/GSL.SP.1997.126.01.14 --- I. C. Mat-Zin and R. E. Swarbrick: The tectonic evolution and associated sedimentation history of Sarawak Basin, eastern Malaysia: a guide for future hydrocarbon exploration / Geological Society, London, Special Publications, 126:237-245, doi:10.1144/GSL.SP.1997.126.01.15 --- M. E. J. Wilson and D. W. J. Bosence: Platform-top and ramp deposits of the Tonasa Carbonate Platform, Sulawesi, Indonesia / Geological Society, London, Special Publications, 126:247-279, doi:10.1144/GSL.SP.1997.126.01.16 --- P. J. Boult: A review of the petroleum potential of Papua New Guinea with a focus on the eastern Papuan Basin and the Pale Sandstone as a potential reservoir fairway / Geological Society, London, Special Publications, 126:281-291, doi:10.1144/GSL.SP.1997.126.01.17 --- J. B. Blanche and J. D. Blanche: An overview of the hydrocarbon potential of the Spratly Islands archipelago and its implications for regional development / Geological Society, London, Special Publications, 126:293-310, doi:10.1144/GSL.SP.1997.126.01.18 --- Ian M. Longley: The tectonostratigraphic evolution of SE Asia / Geological Society, London, Special Publications, 126:311-339, doi:10.1144/GSL.SP.1997.126.01.19 --- D. Roques, S. J. Matthews, and C. Rangin: Constraints on strike-slip motion from seismic and gravity data along the Vietnam margin offshore Da Nang: implications for hydrocarbon prospectivity and opening of the East Vietnam Sea / Geological Society, London, Special Publications, 126:341-353, doi:10.1144/GSL.SP.1997.126.01.20 --- A. J. McCarthy and C. F. Elders: Cenozoic deformation in Sumatra: oblique subduction and the development of the Sumatran Fault System / Geological Society, London, Special Publications, 126:355-363, doi:10.1144/GSL.SP.1997.126.01.21 --- Chris Howells: Tertiary response to oblique subduction and indentation in Sumatra, Indonesia: new ideas for hydrocarbon exploration / Geological Society, London, Special Publications, 126:365-374, doi:10.1144/GSL.SP.1997.126.01.22 --- John L. C. Chambers and Timothy E. Daley: A tectonic model for the onshore Kutai Basin, East Kalimantan / Geological Society, London, Special Publications, 126:375-393, doi:10.1144/GSL.SP.1997.126.01.23 --- Steve J. Moss, John Chambers, Ian Cloke, Dharma Satria, Jason R. Ali, Simon Baker, John Milsom, and Andy Carter: New observations on the sedimentary and tectonic evolution of the Tertiary Kutai Basin, East Kalimantan / Geological Society, London, Special Publications, 126:395-416, doi:10.1144/GSL.SP.1997.126.01.24 --- John Milsom, Robert Holt, Dzazali Bin Ayub, and Ross Smail: Gravity anomalies and deep structural controls at the Sabah-Palawan margin, South China Sea / Geological Society, London, Special Publications, 126:417-427, doi:10.1144/GSL.SP.1997.126.01.25
    Pages: Online-Ressource (VI, 436 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799918
    Language: English
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  • 3
    Publication Date: 1990-01-01
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 4
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Changes in the lipid class and fatty acid composition of developing eggs and unfed larvae of cod (Gadus morhua L.) were studied with the objective of determining probable requirements of cod larvae for dietary lipid. The eggs were collected on 24 March 1985 from holding tanks containing cod which had been caught off the northwest coast of Scotland. Phosphatidylcholine (PC) was the only lipid class to decline in absolute terms during embryogenesis. Catabolism of neutral lipid was initiated during the first week after hatching, and the rate of neutral lipid utilisation increased after the larvae had completely absorbed their yolk sacs. The quantity of triacylglycerol (TAG) remained constant during embryogenesis, but the percentage of 22:6(n-3) int TAG increased substantially during this period. It was calculated that ca. 33% of the 22:6(m-3) released during the process of PC catabolism was incorporated into TAG and sterol ester. The results suggest that PC, replete in appropriate essential fatty acids, should represent a major proportion of the lipid in artificial diets for fish and crustacean larvae.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sedimentation of particulate matter measured at a depth of 100 m varied from 0.2 to 6.0 mg dry weight m-2 d-1 over approximately monthly intervals between September 1986 and June 1987 on the continental shelf of the western Arctic Ocean north of the Canadian Arctic Islands. Detritus deposited during December and January, the period of maximum sedimentation, contained relatively low amounts of organic carbon and nitrogen (4.0% and 0.5% of dry weight, respectively) with a carbon: nitrogen ratio 〉 7. Maximum rates of organic carbon and nitrogen sedimentation (0.60 and 0.12 mg m-2 d-1, respectively) during February were associated with debris enriched with organic matter (organic carbon and nitrogen content of 17.0% and 3.4% of dry weight, C:N=5). Dry weight of macrozooplankton, predominantly Calanus hyperboreus and Metridia longa, separated from preserved trap contents, equalled or exceeded by up to an order-of-magnitude the weight of sedimented debris. Lipid content of CV and adult female stages of C. hyperboreus decreased from 46%–64% of dry weight in September to 20%–30% in January. Females of C. hyperboreus with lower lipid levels (7% of dry weight) between April and June were probably in a post-reproductive condition.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2015-01-30
    Description: Sedimentary strata are the paramount source of geohistorical information. The ‘frozen accidents’ of individual deposits preserve evidence of past physical, chemical and biological processes at the Earth's surface, while the spatial relationships between strata (especially superposition) yield successions of events through time. There is, however, no one-to-one relationship between strata and time, and the interpretation of the stratigraphic record depends on an understanding of its limitations. Stratigraphic continuity and completeness are unattainable ideals, and it is the departures from those ideals – the often cryptic gaps in the record – that provide both its characteristic texture and the principal challenge to its analysis. The existence of gaps is clearly demonstrated by consideration of accumulation rates, but identifying and quantifying them in the field is far more difficult, as is assessing their impact on the degree to which the stratigraphic record represents the environments and processes of the past. These issues can be tackled in a variety of ways, from empirical considerations based on classical field observations, to new ways of analysing data, to the generation and analysis of very large numbers of synthetic datasets. The range of approaches to the fundamental questions of the relationship between strata and time continues to expand and to challenge long-established practices and conventions. Superposed sedimentary strata are the most accessible routes into deep time, and acceptance of their historical significance was a major scientific breakthrough. Given that the study of strata has been undertaken in something like its modern form for over two centuries, stratigraphy as a scientific discipline might be expected to have stabilized, as perhaps is indicated by stratigraphy textbooks suggesting that the subject is widely regarded as boring. Yet if there is a problem with stratigraphy, it is the converse: its development is increasingly punctuated by paradigm shifts triggered by new theories (evolution; global tectonics; eustasy; orbital forcing of climate change) and technological breakthroughs (digital computing; continuous seismic profiling; isotopic methods in chronology and palaeoclimatology). With this accelerating progress, it has become increasingly clear that the stratigraphic record yields only snapshots of Earth's past surface processes – the ‘frozen accidents’ that give the record its character and its enduring fascination. ‘Time is missing from sedimentary sequences on all scales ... This discontinuity gives recorded planetary (geological) time a different architecture to human time’ (Paola, C. 2003. Floods of record. Nature , 425 , 459). Strata and Time: Probing the Gaps in our Understanding was the title of the Geological Society's William Smith Meeting for 2012. Its aim was to explore the relationship between the preserved sedimentary rock record and the passage of geological time, identifying, evaluating and updating the models that lie behind current stratigraphic methods. This volume includes contributions by some of those who presented papers at the conference, together with two additional, related papers. The range of topics in these 15 papers is broad; from field-based studies to numerical modelling exercises, from theoretical considerations of the nature of the record to a study of hydrocarbon reservoir distribution. Critical to all of these studies is the relationship between sedimentary rock strata and geological time.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 7
    Publication Date: 2016-11-09
    Description: Syndepositional deformation in salt-influenced rift basins is complex, being driven by a combination of normal faulting and the growth of salt structures such as diapirs. Owing to a lack of data with which to simultaneously constrain basin structure and synrift stratigraphic architecture, we have a poor understanding of how these processes control shallow-marine deposition in such settings. To improve our understanding we here use seismic reflection and borehole data from the Norwegian Central North Sea to investigate the role that syndepositional fault growth and salt movement played in controlling the sub-regional stratigraphic architecture of a net-transgressive shallow-marine synrift succession (Middle to Late Jurassic). The rift-related structural framework, which is usually dominated by normal fault-bound horst and graben, is strongly modified where an Upper Permian salt layer (Zechstein Supergroup) is sufficiently thick and mobile to act as an intra-stratal detachment, giving rise to decoupled rift-related basement and cover structural styles. Furthermore, cover extension allows the salt to rise diapirically, resulting in the formation of large salt diapirs and supra-salt normal faults formed owing to late-stage salt withdrawal and diapir collapse. Rift-related normal faulting and the growth of salt structures had a dual control on the depositional thickness and facies distribution within the net-transgressive, predominantly shallow-marine, Middle to Upper Jurassic synrift succession. The resulting facies architecture reflects a delicate balance between fault- and salt flow-driven accommodation creation and intra- and extra-basinal sediment supply. Where sediment supply and accumulation rate exceeded accommodation, little or no change in facies is observed across syndepositional structures. In contrast, where accommodation outpaced sediment supply and accumulation rate, footwall-attached shorelines locally developed adjacent to large, thick-skinned normal faults, with deeper water conditions persisting in the adjacent hanging wall. Flooding of structural elements was strongly diachronous and influenced by the underlying rift-related topography, which was characterized by intra-basinal horst and graben. This paper highlights the key role that salt plays in modifying the tectonostratigraphic evolution of rift basins, suggesting that existing models, based on salt-free structural templates, need to be modified.
    Print ISSN: 0016-7649
    Topics: Geosciences
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  • 8
    Publication Date: 2017-07-06
    Description: The structure of igneous plumbing systems in circum-South Atlantic, intra-continental rift basins (e.g. the West and Central African Rift Systems) remains enigmatic owing to poor subsurface data coverage and quality. How magmatism in these basins related to the opening of the South Atlantic is thus poorly understood. We integrate 2D and 3D seismic reflection data ( c. 27 600 km 2 ), data from 23 boreholes, and field observations from the Bornu Basin and Upper Benue Trough, onshore NE Nigeria, to examine the timing and development of igneous bodies possibly related to opening of the South Atlantic. We identify numerous sills, which typically have saucer-shaped and en echelon morphologies, and extrusive volcanic cones. The igneous rocks are alkali basalts and dolerites. Seismic-stratigraphic relationships indicate that emplacement occurred in the Early Cretaceous (Albian to Cenomanian; c. 120 Ma), Late Cretaceous (Santonian to early Campanian; c. 83 Ma) and Cenozoic (Miocene; c. 22 Ma). Magmatism was broadly coeval with major plate boundary interactions, characterized by major azimuthal changes in fracture zones in the developing South Atlantic Ocean. The broad temporal correlation between intra-continental rift basin magmatism and plate boundary interactions suggests that periods of magma emplacement may have, in some way, been instigated by stress dissipation into intra-continental rift basins.
    Print ISSN: 0016-7649
    Topics: Geosciences
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  • 9
    Publication Date: 2017-08-04
    Description: The structure of igneous plumbing systems in circum-South Atlantic, intra-continental rift basins (e.g. the West and Central African Rift Systems) remains enigmatic owing to poor subsurface data coverage and quality. How magmatism in these basins related to the opening of the South Atlantic is thus poorly understood. We integrate 2D and 3D seismic reflection data ( c. 27 600 km 2 ), data from 23 boreholes, and field observations from the Bornu Basin and Upper Benue Trough, onshore NE Nigeria, to examine the timing and development of igneous bodies possibly related to opening of the South Atlantic. We identify numerous sills, which typically have saucer-shaped and en echelon morphologies, and extrusive volcanic cones. The igneous rocks are alkali basalts and dolerites. Seismic-stratigraphic relationships indicate that emplacement occurred in the Early Cretaceous (Albian to Cenomanian; c. 120 Ma), Late Cretaceous (Santonian to early Campanian; c. 83 Ma) and Cenozoic (Miocene; c. 22 Ma). Magmatism was broadly coeval with major plate boundary interactions, characterized by major azimuthal changes in fracture zones in the developing South Atlantic Ocean. The broad temporal correlation between intra-continental rift basin magmatism and plate boundary interactions suggests that periods of magma emplacement may have, in some way, been instigated by stress dissipation into intra-continental rift basins.
    Print ISSN: 0016-7649
    Topics: Geosciences
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  • 10
    Publication Date: 2016-10-15
    Description: The triggers and drivers for salt-related deformation on continental margins are intensely debated, reflecting uncertainties regarding the diagnostic value of certain structural styles, in addition to the fundamental mechanics associated with the two principal mechanisms (gliding and spreading). Determining the triggers and drivers for salt-related deformation is important because they provide insights into continent-scale geodynamic processes, the regional kinematics of gravity-driven deformation, and sediment dispersal and hydrocarbon prospectivity. The processes associated with and the timing of deformation of Messinian salt in the offshore Eastern Mediterranean are uncertain, and thus so is our understanding of the geodynamic evolution of this tectonically complex region. We here use an extensive 2D and 3D seismic reflection dataset to test models for the salt-tectonic development of Messinian salt. We contend that gliding and spreading were not mutually exclusive, but were likely to have overlapped in time and space, being associated with local and far-field tectonics (gliding), as well as differential overburden loading (spreading). We also argue that intrasalt strain and seismic-stratigraphic patterns can be explained by a model invoking a single, post-Messinian period of salt-related deformation, rather than a more complex model involving two separate deformation events that occurred during and after salt deposition.
    Print ISSN: 1354-0793
    Topics: Chemistry and Pharmacology , Geosciences
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