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  • 1
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    Sequence Stratigraphy in British Geology (1996)
    London : The Geological Society
    Details
    Keywords: Großbritannien ; Nordsee ; Sequenzstratigraphie ; Corrélation stratigraphique - Grande-Bretagne ; Geology ; Great Britain ; Sequence stratigraphy ; Stratigraphic correlation ; Stratigraphie - Grande-Bretagne
    Description / Table of Contents: Stephen P. Hesselbo and D. Neil Parkinson: Sequence stratigraphy in British geology / Geological Society, London, Special Publications, 103:1-7, doi:10.1144/GSL.SP.1996.103.01.01 --- Non-Marine and Paralic Sequences --- P. M. Burgess and P. A. Allen: A forward-modelling analysis of the controls on sequence stratigraphical geometries / Geological Society, London, Special Publications, 103:9-24, doi:10.1144/GSL.SP.1996.103.01.02 --- M. R. Leeder and M. D. Stewart: Fluvial incision and sequence stratigraphy: alluvial responses to relative sea-level fall and their detection in the geological record / Geological Society, London, Special Publications, 103:25-39, doi:10.1144/GSL.SP.1996.103.01.03 --- J. P. Wonham and T. Elliott: High-resolution sequence stratigraphy of a mid-Cretaceous estuarine complex: the Woburn Sands of the Leighton Buzzard area, southern England / Geological Society, London, Special Publications, 103:41-62, doi:10.1144/GSL.SP.1996.103.01.04 --- V. P. Wright: Use of palaeosols in sequence stratigraphy of peritidal carbonates / Geological Society, London, Special Publications, 103:63-74, doi:10.1144/GSL.SP.1996.103.01.05 --- Shallow Marine Sequences --- Richard V. Tyson: Sequence-stratigraphical interpretation of organic facies variations in marine siliciclastic systems: general principles and application to the onshore Kimmeridge Clay Formation, UK / Geological Society, London, Special Publications, 103:75-96, doi:10.1144/GSL.SP.1996.103.01.06 --- J. H. S. Macquaker, K. G. Taylor, T. P. Young, and C. D. Curtis: Sedimentological and geochemical controls on ooidal ironstone and ‘bone-bed’ formation and some comments on their sequence-stratigraphical significance / Geological Society, London, Special Publications, 103:97-107, doi:10.1144/GSL.SP.1996.103.01.07 --- Angela L. Coe: Unconformities within the Portlandian Stage of the Wessex Basin and their sequence-stratigraphical significance / Geological Society, London, Special Publications, 103:109-143, doi:10.1144/GSL.SP.1996.103.01.08 --- Deep Marine Sequences --- G. Shanmugam, R. B. Bloch, S. M. Mitchell, J. E. Damuth, G. W. J. Beamish, R. J. Hodgkinson, T. Straume, S. E. Syvertsen, and K. E. Shields: Slump and debris-flow dominated basin-floor fans in the North Sea: an evaluation of conceptual sequence-stratigraphical models based on conventional core data / Geological Society, London, Special Publications, 103:145-176, doi:10.1144/GSL.SP.1996.103.01.09 --- Andrew S. Gale: Turonian correlation and sequence stratigraphy of the Chalk in southern England / Geological Society, London, Special Publications, 103:177-195, doi:10.1144/GSL.SP.1996.103.01.10 --- N. H. Woodcock, A. J. Butler, J. R. Davies, and R. A. Waters: Sequence stratigraphical analysis of late ordovician and early Silurian depositional systems in the Welsh Basin: a critical assessment / Geological Society, London, Special Publications, 103:197-208, doi:10.1144/GSL.SP.1996.103.01.11 --- Regional Studies --- Robert W. O’B. Knox: Tectonic controls on sequence development in the Palaeocene and earliest Eocene of southeast England: implications for North Sea stratigraphy / Geological Society, London, Special Publications, 103:209-230, doi:10.1144/GSL.SP.1996.103.01.12 --- D. N. Parkinson: Gamma-ray spectrometry as a tool for stratigraphical interpretation: examples from the western European Lower Jurassic / Geological Society, London, Special Publications, 103:231-255, doi:10.1144/GSL.SP.1996.103.01.13 --- B. W. Glover and T. McKie: A sequence stratigraphical approach to the understanding of basin history in orogenic Neoproterozoic successions: an example from the central Highlands of Scotland / Geological Society, London, Special Publications, 103:257-269, doi:10.1144/GSL.SP.1996.103.01.15
    Pages: Online-Ressource (277 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799497
    URL: http://sp.lyellcollection.org/content/103/1
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Changes in carbon dioxide during an oceanic anoxic event linked to intrusion into Gondwana coals (2005)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 435 (2005), S. 479-482 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The marine sedimentary record exhibits evidence for episodes of enhanced organic carbon burial known as ‘oceanic anoxic events’ (OAEs). They are characterized by carbon-isotope excursions in marine and terrestrial reservoirs and mass extinction of marine faunas. Causal mechanisms ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03618
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  • 3
    Electronic Resource
    Electronic Resource
    Massive dissociation of gas hydrate during a Jurassic oceanic anoxic event (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 406 (2000), S. 392-395 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the Jurassic period, the Early Toarcian oceanic anoxic event (about 183 million years ago) is associated with exceptionally high rates of organic-carbon burial, high palaeotemperatures and significant mass extinction. Heavy carbon-isotope compositions in rocks and fossils of this age ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35019044
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  • 4
    Electronic Resource
    Electronic Resource
    Quartz silt in mudrocks as a key to sequence stratigraphy (Kimmeridge Clay Formation, Late Jurassic, Wessex Basin, UK) (2001)
    Oxford UK : Blackwell Science Ltd.
    Terra nova 13 (2001), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Sequence-stratigraphic interpretation of mudrocks is often carried out using proxy indicators for grain size or by consideration of other aspects of lithology thought to relate to sea-level change, such as organic-matter content. An alternative stratigraphic analysis, based on direct estimation of quartz-silt content, was carried out on a major Late Jurassic mudrock (and oil source rock), the Kimmeridge Clay Formation of the Wessex Basin, Dorset, UK. The new data, generated by backscatter SEM, X-ray and image analysis, show decametre-scale stratigraphic patterns that are incompatible with many previous sequence-stratigraphic interpretations based on gamma-ray logs or visual lithofacies and biofacies description. Correlation with a basin-margin section in the Boulonnais, northern France, indicates that silt-rich intervals in basinal facies are coeval, within the limits of biostratigraphic resolution, with shallow-water sand-rich packages on the margin. Variation in silt content in the Kimmeridge Clay therefore appears to be a record of relative sea-level change of at least regional extent. It is suggested that analysis of silt content offers the most reliable basis for generation of a regional sequence stratigraphy in basinal mudrocks. A revised relative sea-level curve for the Wessex Basin Kimmeridgian and early Tithonian is presented based on this premise.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3121.2001.00378.x
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  • 5
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    Thallium isotopes in early diagenetic pyrite – a paleoredox proxy? (2011)
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2011. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Geochimica et Cosmochimica Acta 75 (2011): 6690-6704, doi:10.1016/j.gca.2011.07.047.
    Description: This paper presents the first study of Tl isotopes in early diagenetic pyrite. Measurements from two sections deposited during the Toarcian Ocean Anoxic Event (T-OAE, ~183Ma) are compared with data from Late Neogene (〈10Ma) pyrite samples from ODP legs 165 and 167 that were deposited in relatively oxic marine environments. The Tl isotope compositions of Late Neogene pyrites are all significantly heavier than seawater, which most likely indicates that Tl in diagenetic pyrite is partially sourced from ferromanganese oxy-hydroxides that are known to display relatively heavy Tl isotope signatures. One of the T-OAE sections from Peniche in Portugal displays pyrite thallium isotope compositions indistinguishable from Late Neogene samples, whereas samples from Yorkshire in the UK are depleted in the heavy isotope of Tl. These lighter compositions are best explained by the lack of ferromanganese precipitation at the sediment–water interface due the sulphidic (euxinic) conditions thought to be prevalent in the Cleveland Basin where the Yorkshire section was deposited. The heavier signatures in the Peniche samples appear to result from an oxic water column that enabled precipitation of ferromanganese oxy-hydroxides at the sediment–water interface. The Tl isotope profile from Yorkshire is also compared with previously published molybdenum isotope ratios determined on the same sedimentary succession. There is a suggestion of an anti-correlation between these two isotope systems, which is consistent with the expected isotope shifts that occur in seawater when marine oxic (ferromanganese minerals) fluxes fluctuate. The results outlined here represent the first evidence that Tl isotopes in early diagenetic pyrite have potential to reveal variations in past ocean oxygenation on a local scale and potentially also for global oceans. However, much more information about Tl isotopes in different marine environments, especially in anoxic/euxinic basins, is needed before Tl isotopes can be confidently utilized as a paleo-redox tracer.
    Description: SGN is funded by a NERC fellowship.
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
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  • 6
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    Evidence of a South Asian proto-monsoon during the Oligocene-Miocene transition (2021)
    American Geophysical Union
    Details
    Publication Date: 2022-10-26
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Beasley, C., Kender, S., Giosan, L., Bolton, C. T., Anand, P., Leng, M. J., Nilsson-Kerr, K., Ullmann, C. V., Hesselbo, S. P., & Littler, K. Evidence of a South Asian proto-monsoon during the Oligocene-Miocene transition. Paleoceanography and Paleoclimatology, 36(9), (2021): e2021PA004278, https://doi.org/10.1029/2021PA004278.
    Description: The geological history of the South Asian monsoon (SAM) before the Pleistocene is not well-constrained, primarily due to a lack of available continuous sediment archives. Previous studies have noted an intensification of SAM precipitation and atmospheric circulation during the middle Miocene (∼14 Ma), but no records are available to test how the monsoon changed prior to this. In order to improve our understanding of monsoonal evolution, geochemical and sedimentological data were generated for the Oligocene-early Miocene (30–20 Ma) from Indian National Gas Hydrate Expedition 01 Site NGHP-01-01A in the eastern Arabian Sea, at 2,674 m water depth. We find the initial glaciation phase (23.7–23.0 Ma) of the Oligocene-Miocene transition (OMT) to be associated with an increase in water column ventilation and water mass mixing, suggesting an increase in winter monsoon type atmospheric circulation, possibly driven by a relative southward shift of the intertropical convergence zone. During the latter part of the OMT, or “deglaciation” phase (23.0–22.7 Ma), a long-term decrease in Mn (suggestive of deoxygenation), increase in Ti/Ca and dissolution of the biogenic carbonate fraction suggest an intensification of a proto-summer SAM system, characterized by the formation of an oxygen minimum zone in the eastern Arabian Sea and a relative increase of terrigenous material delivered by runoff to the site. With no evidence at this site for an active SAM prior to the OMT we suggest that changes in orbital parameters, as well as possibly changing Tethyan/Himalayan tectonics, caused this step change in the proto-monsoon system at this intermediate-depth site.
    Description: This research forms part of a PhD study funded by the Natural Environment Research Council (NERC) Centre for Doctoral Training in Oil & Gas (grant number NE/M00578X/1) awarded to C. Beasley, and was also supported by a NERC National Environmental Isotope Facility Steering Committee grant (IP-1865-1118) awarded to S. Kender. L. Giosan acknowledges funding from USSP and WHOI and thanks colleagues from the NGHP-01 expedition. C. Ullmann acknowledges funding via NERC grant NE/N018508/1.
    Keywords: South Asian Monsoon ; Foraminiferal stable isotopes ; Trace elements ; Arabian Sea ; Oligocene-Miocene transition
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 7
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    Orbital pacing and secular evolution of the Early Jurassic carbon cycle (2020)
    National Academy of Sciences
    Details
    Publication Date: 2020-02-10
    Description: Global perturbations to the Early Jurassic environment (∼201 to ∼174 Ma), notably during the Triassic–Jurassic transition and Toarcian Oceanic Anoxic Event, are well studied and largely associated with volcanogenic greenhouse gas emissions released by large igneous provinces. The long-term secular evolution, timing, and pacing of changes in the Early Jurassic carbon cycle that provide context for these events are thus far poorly understood due to a lack of continuous high-resolution δ13C data. Here we present a δ13CTOC record for the uppermost Rhaetian (Triassic) to Pliensbachian (Lower Jurassic), derived from a calcareous mudstone succession of the exceptionally expanded Llanbedr (Mochras Farm) borehole, Cardigan Bay Basin, Wales, United Kingdom. Combined with existing δ13CTOC data from the Toarcian, the compilation covers the entire Lower Jurassic. The dataset reproduces large-amplitude δ13CTOC excursions (〉3‰) recognized elsewhere, at the Sinemurian–Pliensbachian transition and in the lower Toarcian serpentinum zone, as well as several previously identified medium-amplitude (∼0.5 to 2‰) shifts in the Hettangian to Pliensbachian interval. In addition, multiple hitherto undiscovered isotope shifts of comparable amplitude and stratigraphic extent are recorded, demonstrating that those similar features described earlier from stratigraphically more limited sections are nonunique in a long-term context. These shifts are identified as long-eccentricity (∼405-ky) orbital cycles. Orbital tuning of the δ13CTOC record provides the basis for an astrochronological duration estimate for the Pliensbachian and Sinemurian, giving implications for the duration of the Hettangian Stage. Overall the chemostratigraphy illustrates particular sensitivity of the marine carbon cycle to long-eccentricity orbital forcing.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 8
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    Mercury evidence for pulsed volcanism during the end-Triassic mass extinction (2017)
    National Academy of Sciences
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    Publication Date: 2017-06-19
    Description: The Central Atlantic Magmatic Province (CAMP) has long been proposed as having a causal relationship with the end-Triassic extinction event (∼201.5 Ma). In North America and northern Africa, CAMP is preserved as multiple basaltic units interbedded with uppermost Triassic to lowermost Jurassic sediments. However, it has been unclear whether this apparent pulsing was a local feature, or if pulses in the intensity of CAMP volcanism characterized the emplacement of the province as a whole. Here, six geographically widespread Triassic–Jurassic records, representing varied paleoenvironments, are analyzed for mercury (Hg) concentrations and Hg/total organic carbon (Hg/TOC) ratios. Volcanism is a major source of mercury to the modern environment. Clear increases in Hg and Hg/TOC are observed at the end-Triassic extinction horizon, confirming that a volcanically induced global Hg cycle perturbation occurred at that time. The established correlation between the extinction horizon and lowest CAMP basalts allows this sedimentary Hg excursion to be stratigraphically tied to a specific flood basalt unit, strengthening the case for volcanic Hg as the driver of sedimentary Hg/TOC spikes. Additional Hg/TOC peaks are also documented between the extinction horizon and the Triassic–Jurassic boundary (separated by ∼200 ky), supporting pulsatory intensity of CAMP volcanism across the entire province and providing direct evidence for episodic volatile release during the initial stages of CAMP emplacement. Pulsatory volcanism, and associated perturbations in the ocean–atmosphere system, likely had profound implications for the rate and magnitude of the end-Triassic mass extinction and subsequent biotic recovery.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 9
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    Comments on “Paleosalinity determination in ancient epicontinental seas: A case study of the T-OAE in the Cleveland Basin (UK)” by Remirez, M. N. and Algeo, T. J. (2020)
    Elsevier
    Details
    Publication Date: 2020-09-01
    Print ISSN: 0012-8252
    Electronic ISSN: 1872-6828
    Topics: Geography , Geosciences
    Published by Elsevier
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  • 10
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    Shale Anisotropy and Natural Hydraulic Fracture Propagation: An Example from the Jurassic (Toarcian) Posidonienschiefer, Germany (2020)
    American Geophysical Union
    Details
    Publication Date: 2020-03-01
    Print ISSN: 2169-9313
    Electronic ISSN: 2169-9356
    Topics: Geosciences , Physics
    Published by American Geophysical Union
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