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  • 1
    Monograph available for loan
    Monograph available for loan
    London : Geological Society
    Associated volumes
    Call number: AWI G5-98-0115
    In: Geological Society special publication, No. 116
    Description / Table of Contents: The magnitude and causes of decadal to century-scale changes in climate are major issues of global concern. The separation of anthropogenically driven change from natural 'baseline' variability within the atmosphere/ocean system is a prerequisite to identifying human impact on global climate. An understanding of past climate variability is therefore a key to predicting future climate change. The sedimentary record of the oceans, seas and lakes is produced by a series of depositional events that occur on seasonal timescales but can rarely be resolved due to mixing of the sediment by bottomdwelling organisms. Where they are preserved, laminated sediments act like tree rings to record these seasonal-scale processes, such as plankton blooms and floods, and provide a uniquely high-resolution record of environmental change. In addition, annually laminated or 'varved' sediment sequences act as geochronometers against which other timescales can be tested. Laminated sediments may therefore be used to develop records of interannual and decadal-scale variability which serve to test models of climate change. The authors cover a range of topics that include strategies for study and techniques of analysis. A series of case studies, dealing with a variety of lacustrine and marine records, illustrates the wide potential of laminated sediments as palaeoclimatic and palaeoceanographic indicators. This volume will appeal to a wide range of earth and environmental scientists, geographers, geologists and oceanographers.
    Type of Medium: Monograph available for loan
    Pages: XII, 258 Seiten , Illustrationen
    ISBN: 1897799675
    Series Statement: Geological Society Special Publication 116
    Language: English
    Note: Alan E. S. Kemp: Laminated sediments as palaeo-indicators / Geological Society, London, Special Publications, 116:vii-xii, doi:10.1144/GSL.SP.1996.116.01.01 --- Controls on Formation and Strategies for Study --- Roger Y. Anderson: Seasonal sedimentation: a framework for reconstructing climatic and environmental change / Geological Society, London, Special Publications, 116:1-15, doi:10.1144/GSL.SP.1996.116.01.02 --- Constance Sancetta: Laminated diatomaceous sediments: controls on formation and strategies for analysis / Geological Society, London, Special Publications, 116:17-21, doi:10.1144/GSL.SP.1996.116.01.03 --- Neal R. O’Brien: Shale lamination and sedimentary processes / Geological Society, London, Special Publications, 116:23-36, doi:10.1144/GSL.SP.1996.116.01.04 --- Methods and Techniques --- Jennifer Pike and Alan E. S. Kemp: Preparation and analysis techniques for studies of laminated sediments / Geological Society, London, Special Publications, 116:37-48, doi:10.1144/GSL.SP.1996.116.01.05 --- Bernd Zolitschka: Image analysis and microscopic investigation of annually laminated lake sediments from Fayetteville Green Lake (NY, USA) Lake C2 (NWT, Canada) and Holzmaar (Germany): a comparison / Geological Society, London, Special Publications, 116:49-55, doi:10.1144/GSL.SP.1996.116.01.06 --- Lacustrine Environments --- Konrad A. Hughen, Jonathan T. Overpeck, Robert F. Anderson, and Kerstin M. Williams: The potential for palaeoclimate records from varved Arctic lake sediments: Baffin Island, Eastern Canadian Arctic / Geological Society, London, Special Publications, 116:57-71, doi:10.1144/GSL.SP.1996.116.01.07 --- Gunilla Petterson: Varved sediments in Sweden: a brief review / Geological Society, London, Special Publications, 116:73-77, doi:10.1144/GSL.SP.1996.116.01.08 --- A. B. Leslie, A. C. Kendall, G. M. Harwood, and D. W. Powers: Conflicting indicators of palaeodepth during deposition of the Upper Permian Castile Formation, Texas and New Mexico / Geological Society, London, Special Publications, 116:79-92, doi:10.1144/GSL.SP.1996.116.01.09 --- California Borderland Basins --- D. S. Gorsline, Enrique Nava-Sanchez, and Janette Murillo de Nava: A survey of occurrences of Holocene laminated sediments in California Borderland Basins: products of a variety of depositional processes / Geological Society, London, Special Publications, 116:93-110, doi:10.1144/GSL.SP.1996.116.01.10 --- James W. Hagadorn: Laminated sediments of Santa Monica Basin, California continental borderland / Geological Society, London, Special Publications, 116:111-120, doi:10.1144/GSL.SP.1996.116.01.11 --- Arndt Schimmelmann and Carina B. Lange: Tales of 1001 varves: a review of Santa Barbara Basin sediment studies / Geological Society, London, Special Publications, 116:121-141, doi:10.1144/GSL.SP.1996.116.01.12 --- David Bull and Alan E. S. Kemp: Composition and origins of laminae in late Quaternary and Holocene sediments from the Santa Barbara Basin / Geological Society, London, Special Publications, 116:143-156, doi:10.1144/GSL.SP.1996.116.01.13 --- Continental Margin and Other Marine Basins --- Jennifer Pike and Alan E. S. Kemp: Records of seasonal flux in Holocene laminated sediments, Gulf of California / Geological Society, London, Special Publications, 116:157-169, doi:10.1144/GSL.SP.1996.116.01.14 --- Konrad A. Hughen, Jonathan T. Overpeck, Larry C. Peterson, and Robert F. Anderson: The nature of varved sedimentation in the Cariaco Basin, Venezuela, and its palaeoclimatic significance / Geological Society, London, Special Publications, 116:171-183, doi:10.1144/GSL.SP.1996.116.01.15 --- H. Schulz, U. Von Rad, and U. Von Stackelberg: Laminated sediments from the oxygen-minimum zone of the northeastern Arabian Sea / Geological Society, London, Special Publications, 116:185-207, doi:10.1144/GSL.SP.1996.116.01.16 --- Grzegorz Haczewski: Oligocene laminated limestones as a high-resolution correlator of palaeoseismicity, Polish Carpathians / Geological Society, London, Special Publications, 116:209-220, doi:10.1144/GSL.SP.1996.116.01.17 --- Deep-sea Laminated Sediment Records --- R. B. Pearce, A. E. S. Kemp, J. G. Baldauf, and S. C. King: High-resolution sedimentology and micropalaeontology of laminated diatomaceous sediments from the eastern equatorial Pacific Ocean (Leg 138) / Geological Society, London, Special Publications, 116:221-241, doi:10.1144/GSL.SP.1996.116.01.18 --- Alan E. S. Kemp, Jack G. Baldauf, and Richard B. Pearce: Origins and palaeoceangraphic significance of laminated daitom ooze from the Eastern Equatorial Pacific Ocean / Geological Society, London, Special Publications, 116:243-252, doi:10.1144/GSL.SP.1996.116.01.19
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  • 2
    Publication Date: 2012-08-01
    Description: Finely laminated Middle Eocene sediments from the central Arctic contain high abundances of the delicate, sea ice–dwelling fossil diatoms Synedropsis spp. and sea ice–rafted debris (sea ice–IRD), establishing an offshore seasonal sea ice regime ca. 47 Ma. Synedropsis spp. co-occur with other diatom taxa and microfossils requiring open water. This strongly indicates seasonality; nonetheless, seasonal reconstruction of the flux cycle cannot be resolved by standard bulk-sediment analysis, which destroys sedimentary fabrics and averages data within samples. Here we resolve and reconstruct seasonal-scale flux events from these sediments using backscattered electron imagery (BSEI) of resin-embedded sediment, a nondestructive technique that preserves the integrity of sedimentary microfabrics, thus revealing discrete productivity-flux events at ultrahigh (e.g., 〈30 μm) resolution. Seasonality is expressed at the submillimeter scale by successions of discrete mono-specific laminae and micro-lenses of Synedropsis spp., terrigenous material (sea ice–IRD), and open-water taxa, indicating that first-year ice existed in the central Arctic. Further, BSEI reveals millimeter-scale alternation of bundles of laminae and microlenses of two distinct types: one characterized by Synedropsis spp. and terrigenous material, the other by mainly open-water taxa and little terrigenous material. The sedimentation rate and preliminary assessment of annual cycles indicate suborbital variability on the order of multi-decadal to centennial duration; we argue that this reflects variations in the sea ice–season length.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
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  • 3
    Publication Date: 1997-01-01
    Description: Radiometric and AMS radiocarbon dating of a 6-m sediment core from Loch Ness, Scotland, indicates that it represents perhaps the very end of the Late Pleistocene, and the first ca. 7500 yr of the Holocene. Counts of laminations observed in the Holocene section of the core suggest that they are present in sufficient number to constitute annual laminations (varves), an hypothesis consistent with the pollen record, which contains a sequence of zones representative of the Early, Middle and part of the Late Holocene regional vegetation history. On the basis of BSEM and X-ray studies of sediments, and modern seston trap data, the laminations are believed to be produced by winter floods, which introduce increased silt loading into the Loch. Sediment for the rest of the year is mostly composed of clay-sized material. This hypothesis is being further tested, however, by continuing sedimentological and microfossil studies.Time-depth relations for the core based on calibrated 14C dates and lamination counts, respectively, illustrate the close correspondence between the two sets of data. The latter are therefore now being used to develop a varve chronology for the Holocene for Loch Ness. This will then in turn be used for further chronological studies, and for investigations of palaeoclimatic variations over the eastern North Atlantic, to which the signal of lamination thickness in the sediments is thought to be particularly sensitive. They may also eventually be used for calibration studies, employing 14C dating of specific carbon compounds, or groups of compounds extracted from the sediment using modern organic geochemical methods.
    Print ISSN: 0033-8222
    Electronic ISSN: 1945-5755
    Topics: Archaeology , Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 4
    Publication Date: 1985-06-01
    Description: Previous studies of low-grade metamorphism in the Southern Uplands accretionary terrain indicated prehnite-pumpellyite facies/anchizone conditions developed throughout the area, except for local preservation of trench-slope sediments and an accreted seamount at zeolite facies/advanced diagenetic grade. New graptolite reflectance data are presented that show a general northward increase in temperature in the Southern Uplands. The results from two cross-strike traverses in the southern and central belts in contemporaneous sequences, using illite crystallinity, illite lateral spacing (bo) , and graptolite reflectance, indicate the development of systematic accretion-related low-grade metamorphism. Well-developed and constant anchizone conditions occur throughout the NE (Langholm) traverse, associated with common, F1 accretion-related folding and a regionally penetrative S1 cleavage. In the SW (Kirkcudbright) traverse, however, the youngest, last accreted packets are preserved at a transitional diagenetic stage and lack a penetrative S1 cleavage. Illite crystallinity, graptolite reflectance, and bo increase systematically northward through earlier accreted packets, reaching values of the NE traverse only at the northern end. The concomitant increase of bo with illite crystallinity suggests the relatively high P-low T trajectory characteristic of subduction zones. Integration of metamorphic and structural data relates increasing intensity of aceretion-related F1 folding, developmertt of S1 fabric, and onset of later fold phases to grade of metamorphism and structural level within the accretionary pile.
    Print ISSN: 0026-461X
    Electronic ISSN: 1471-8022
    Topics: Geosciences
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  • 5
    Publication Date: 1995-01-01
    Print ISSN: 0016-7649
    Topics: Geosciences
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  • 6
    Publication Date: 1995-01-01
    Print ISSN: 0016-7649
    Topics: Geosciences
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  • 7
  • 8
    Publication Date: 1987-09-01
    Print ISSN: 0016-7649
    Topics: Geosciences
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  • 9
  • 10
    Publication Date: 1990-01-01
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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