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  • 1
    Online Resource
    Online Resource
    Oxford :Taylor & Francis Group,
    Keywords: Geomorphology-History. ; Electronic books.
    Description / Table of Contents: Originally published in 1984. Landforms and their formative processes are treated on a broad spectrum of spatial scales, and examples are drawn from the major geological, climatic and biotic environments. All scholars and professionals with an interest in the environment will find this book an indispensable source.
    Type of Medium: Online Resource
    Pages: 1 online resource (657 pages)
    Edition: 1st ed.
    ISBN: 9781000000269
    Series Statement: Collected Works of Richard J. Chorley Series
    DDC: 551.4
    Language: English
    Note: Cover -- Half Title -- Title Page -- Copyright Page -- Original Title Page -- Original Copyright Page -- Outline contents -- Contents -- Acknowledgements -- Preface -- Part One Introduction -- One Approaches to geomorphology -- 1.1 Concepts -- 1.2 The geomorphic system -- 1.2.1 Systems structure -- 1.2.2 Complex response and thresholds -- 1.3 Geomorphic scale -- 1.3.1 Timescales -- 1.3.2 Spatial scales -- Two Morphologic evolutionary systems -- 2.1 The cycle of erosion -- 2.2 Interruptions of the cycle of erosion -- 2.3 Denudation chronology -- 2.4 Criticisms of the cycle and alternative models -- 2.4.1 The Penck model -- 2.4.2 The L. C. King model -- 2.5 Strategies for inferring landform evolution -- 2.5.1 Ergodic assumptions -- 2.5.2 Direct observation and measurement -- 2.5.3 Simulation modelling -- 2.6 Equilibriumla ndforms -- 2.7 New evolutionary concepts -- Three Cascading process systems -- 3.1 The solar energy cascade -- 3.2 The hydrological cycle -- 3.3 Denudation: the sediment cascade -- 3.3.1 Transported loads in rivers -- 3.3.2 Erosion rates over space and time -- 3.3.3 Regional denudation -- 3.4 Diastrophism: the geophysical cascade -- 3.4.1 Orogenic movements -- 3.4.2 Isostatic and epeirogenic movements -- 3.5 Diastrophism and erosion -- Part Two Geological geomorphology -- Four Minerals, rocks and sediments -- 4.1 Igneous minerals and rocks -- 4.1.1 Minerals -- 4.1.2 Igneous rocks -- 4.2 Sediments -- 4.2.1 Provenance -- 4.2.2 Particle size and sorting -- 4.2.3 Particle shape -- 4.2.4 Sedimentary fabric -- 4.3 Sedimentary rocks -- 4.3.1 Bedding -- 4.3.2 Diagenesis -- 4.3.3 Classification -- 4.3.3.1 Clastic rocks -- 4.3.3.2 Chemically precipitated rocks -- 4.3.4 Facies -- 4.4 Metamorphic rocks -- Five Diastrophism -- 5.1 Earth structure -- 5.1.1 Global topography -- 5.1.2 Geophysical evidence -- 5.1.3 Interpretations of the evidence. , 5.2 Global tectonics -- 5.2.1 Continental drift and plate tectonics -- 5.2.2 Zones of spreading -- 5.2.3 Subduction zones and orogeny -- Six Igneous activity and landforms -- 6.1 Igneous activity in space and time -- 6.2 Intrusive constructional forms -- 6.2.1 Plutons -- 6.2.2 Smaller intrusions -- 6.3 Extrusive constructional forms -- 6.3.1 Types of eruption -- 6.3.2 Basaltic magmas -- 6.3.3 · Acidic magmas -- 6.4 Igneous tectonism -- Seven Structure and landforms -- 7.1 Horizontal and domed structures -- 7.2 Homoclinal structures -- 7.3 Folded structures -- 7.3.1 Simple folding -- 7 .3.2 Complex folding -- 7.4 Faulted structures -- 7.4.1 Faulting -- 7.4.2 Faulted landforms -- Eight Lithology and landforms -- 8.1 Arenaceous landforms -- 8.2 Argillaceous landforms -- 8.3 Calcareous landforms -- 8.4 Igneous destructional landforms -- 8.5 Metamorphic landforms -- 8.6 Rock strength -- Part Three Geomorphic processes and landforms -- Nine Weathering -- 9.1 The earth-atmosphere interface -- 9.2 Processes of weathering -- 9.2.1 Physical weathering -- 9.2.2 Chemical weathering -- 9.2.3 Biochemical weathering -- 9.3 Rates of weathering -- 9.4 The weathered mantle -- Ten Mass movement -- 10.1 Significance -- 10.2 Gravity tectonics -- 10.3 Classification -- 10.4 Location of mass movement -- 10.5 Causes of mass movement -- 10.6 Mass movement and landform evolution -- Eleven Hillslopes -- 11.1 Introduction -- 11.2 Characteristic slopes -- 11.3 Classification of hillslopes -- 11.4 Origin of hillslopes -- 11.5 Hillslope erosion -- 11.5.1 Creep -- 11.5.2 Overland flow -- 11.5.3 Rainsplash -- 111.5.4 Slope erosion -- 11.5.5 Rills -- 11.5.6 Throughflow -- 11.6 The evolution of hillslopes -- 11.7 Summary -- Twelve Rivers -- 12.1 Significance -- 12.2 Open-channel hydraulics -- 12.3 Sediment transport -- 12.4 Hydrology -- 12.5 River morphology. , 12.5.1 Hydraulic geometry -- 12.5.2 Channel patterns -- 12.6 Channel stability -- 12.6.1 Stable channels -- 12.6.2 Unstable channels -- 12.7 Examples of river metamorphosis -- 12.7.1 Historical river metamorphosis -- 12.7.2 Geological river metamorphosis -- 12.8 Rivers and valley morphology -- Thirteen Drainage basins -- 13.1 The basin geomorphic unit -- 13.2 Morphometric analysis -- 13.3 Morphometric controls -- 13.4 Drainage basin evolution -- 13.4.1 The ergodic method -- 13.4.2 Physical simulation -- 13.5 Drainage basin response -- Fourteen Fluvial depositional landforms -- 14.1 Alluvial fans -- 14.1.1 Fan structure -- 14.1.2 Dry fans -- 14.1.3 Wet fans -- 14.1.4 Depositional belts -- 14.2 Valley fills -- 14.2.1 Floodplains -- 14.2.2 River terraces -- 14.3 Deltas -- 14.3.1 Delta morphology -- 14.3.2 Experimental study of delta morphology -- 14.3.3 Avulsion -- Fifteen Coastal geomorphology -- 15.1 Sea level, waves and currents -- 15.2 Beach processes and profiles -- 15.3 Shoreline processes and depositional forms -- 15.3.1 Longshore movement -- 15.3.2 Shoreline configuration -- 15.3.3 Barrier islands -- 15.4 Erosional coasts -- 15.4.1 Processes of coastal bedrock erosion -- 15.4.2 Cliffs -- 15.4.3 Shore platforms -- 15.5 Sea-level variations -- 15.5.1 Eustatic changes -- 15.5.2 Submergence features -- 15.5.3 Emergence features -- 15.5.4 Coastal classification -- 15.6 Organic coasts -- 15.6.1 Coral reefs -- 15.6.2 Salt marshes and mangrove coasts -- 15.7 Coastal management -- Sixteen Aeolian processes and landforms -- 16.1 Aeolian environments -- 16.2 Aeolian sand movement -- 16.3 Wind abrasion -- 16.4 Aeolian bedforms -- 16.5 Coastal sand dunes -- 16.6 Loess -- 16.7 Snow drifting -- Seventeen The glacier sedimentary system -- 17.1 Glaciers -- 17.2 Glacier ice -- 17.3 Glacier flow -- 17.3.1 Internal deformation -- 17.3.2 Sliding and bed deformation. , 17.3.3 Velocities -- 17.3.4 Ice surface features -- 17.4 Rock debris in glaciers -- 17.5 Processes affecting debris at the glacier sole -- 17.5.1 Entrainment -- 17.5.2 Rocle particles in traction at the bed -- 17.6 Erosion by glaciers -- 17.7 Deposition by glaciers -- 17.8 Landforms of glacial deposition -- 17.9 The glacier meltwater subsystem -- Part Four Climatic geomorphology -- Eighteen Morphogenetic landforms -- 18.1 Morphogenetic regions -- 18.2 Humid tropical landforms -- 18.3 Tropical wet-dry landforms -- 18.4 Arid and semi-arid landforms -- 18.4.1 Pediments -- 18.4.2 Inselbergs -- 18.4.3 Desert surfaces -- 18.5 Cold region landforms -- 18.5.1 The periglacial system -- 18.5.2 The glacial system -- Nineteen Geomorphological effects of former glacier expansion -- 19.1 Introduction -- 19.2 Direct erosional effects -- 19.2.1 Alpine glaciation -- 19.2.2 Ice sheet glaciation -- 19.3 Direct depositional effects -- 19.3.1 Glacial deposition -- 19.3.2 Models of ice retreat -- 19.4 Indirect effects: glacioisostasy and glacioeustasy -- Twenty Climatic change and polygenetic landforms -- 20.1 Climatic change -- 20.1.1 Tertiary climatic changes -- 20.1.2 Pleistocene climatic changes -- 20.1.3 Holocene climatic changes -- 20.1.4 Historical climatic changes -- 20.2 The geomorphic effects of climatic change -- 20.2.1 Precipitation changes dominant -- 20.2.2 Temperature changes dominant -- 20.3 Conclusion -- Appendix Applied geomorphology -- A 1.1 Nature of applied geomorphology -- A 1.2 Objectives of applied geomorphology -- A 1.3 Geomorphic hazards -- A 1.4 Fluvial hazard evaluation -- A 1.5 Case studies -- Plates -- Index -- Endpiece The geological time s cale.
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  • 2
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    PANGAEA
    In:  Supplement to: Sugden, David E; McCulloch, Robert D; Bory, Aloys J-M; Hein, Andrew S (2009): Influence of Patagonian glaciers on Antarctic dust deposition during the last glacial period. Nature Geoscience, 2, 281-285, https://doi.org/10.1038/ngeo474
    Publication Date: 2023-05-12
    Description: Ice cores provide a record of changes in dust flux to Antarctica, which is thought to reflect changes in atmospheric circulation and environmental conditions in dust source areas (Forster et al., 2007; Diekmann et al. 2000, doi:10.1016/S0031-0182(00)00138-3; Winckler et al., 2008, doi:10.1126/science.1150595; Reader et al., 1999, doi:10.1029/1999JD900033; Mahowald et al., 1999, doi:10.1029/1999JD900084; Petit et al., 1999, doi:10.1038/20859; 1990, doi:10.1038/343056a0 Delmonte et al., 2009, doi:10.1029/2008GL033382; Lambert et al., 2008, doi:10.1038/nature06763). Isotopic tracers suggest that South America is the dominant source of the dust (Grousset et al., 1992, doi:10.1016/0012-821X(92)90177-W; Basile et al., 1997, doi:10.1016/S0012-821X(96)00255-5; Gaiero et al., 2007, doi:10.1016/j.chemgeo.2006.11.003), but it is unclear what led to the variable deposition of dust at concentrations 20–50 times higher than present in glacial-aged ice (Petit et al., 1990, doi:10.1038/343056a0; Lambert et al., 2008, doi:10.1038/nature06763). Here we characterize the age and composition of Patagonian glacial outwash sediments, to assess the relationship between the Antarctic dust record from Dome C (refs Lambert et al., 2008, doi:10.1038/nature06763; Wolff et al., 2006, doi:10.1038/nature04614) and Patagonian glacial fluctuations (Sugden et al., 2005; McCulloch et al., 2005, doi:10.1111/j.0435-3676.2005.00260.x; Kaplan et al., 2008, doi:10.1016/j.quascirev.2007.09.013) for the past 80,000 years. We show that dust peaks in Antarctica coincide with periods in Patagonia when rivers of glacial meltwater deposited sediment directly onto easily mobilized outwash plains. No dust peaks were noted when the glaciers instead terminated directly into pro-glacial lakes. We thus propose that the variable sediment supply resulting from Patagonian glacial fluctuations may have acted as an on/off switch for Antarctic dust deposition. At the last glacial termination, Patagonian glaciers quickly retreated into lakes, which may help explain why the deglacial decline in Antarctic dust concentrations preceded the main phase of warming, sea-level rise and reduction in Southern Hemisphere sea-ice extent (Wolff et al., 2006, doi:10.1038/nature04614).
    Keywords: AGE; Age, 14C AMS; Age, calibrated; Age, dated; Age, dated standard deviation; Age, maximum/old; Age, minimum/young; Amarillo; Cerro_Ataud; Esmeralda; Event label; Guayrabo; HAND; Isla_Dawson; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; Otway; P_Hambre; Patagonia; Sampling by hand; St_Maria; Strait of Magellan, Chile; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error; ε-Neodymium, standard deviation; ε-Neodymium (0)
    Type: Dataset
    Format: text/tab-separated-values, 80 data points
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  • 3
    Publication Date: 2018-08-10
    Description: Abstract The Weddell Sea sector is one of the main formation sites for Antarctic Bottom Water and an outlet for about one fifth of Antarctica's continental ice volume. Over the last few decades, studies on glacial–geological records in this sector have provided conflicting reconstructions of changes in ice-sheet extent and ice-sheet thickness since the Last Glacial Maximum (LGM at ca 23–19 calibrated kiloyears before present, cal ka BP). Terrestrial geomorphological records and exposure ages obtained from rocks in the hinterland of the Weddell Sea, ice-sheet thickness constraints from ice cores and some radiocarbon dates on offshore sediments were interpreted to indicate no significant ice thickening and locally restricted grounding-line advance at the LGM. Other marine geological and geophysical studies concluded that subglacial bedforms mapped on the Weddell Sea continental shelf, subglacial deposits and sediments over-compacted by overriding ice recovered in cores, and the few available radiocarbon ages from marine sediments are consistent with major ice-sheet advance at the LGM. Reflecting the geological interpretations, different ice-sheet models have reconstructed conflicting {LGM} ice-sheet configurations for the Weddell Sea sector. Consequently, the estimated contributions of ice-sheet build-up in the Weddell Sea sector to the {LGM} sea-level low-stand of ~130 m vary considerably. In this paper, we summarise and review the geological records of past ice-sheet margins and past ice-sheet elevations in the Weddell Sea sector. We compile marine and terrestrial chronological data constraining former ice-sheet size, thereby highlighting different levels of certainty, and present two alternative scenarios of the {LGM} ice-sheet configuration, including time-slice reconstructions for post-LGM grounding-line retreat. Moreover, we discuss consistencies and possible reasons for inconsistencies between the various reconstructions and propose objectives for future research. The aim of our study is to provide two alternative interpretations of glacial–geological datasets on Antarctic Ice-Sheet History for the Weddell Sea sector, which can be utilised to test and improve numerical ice-sheet models.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
    Publication Date: 2018-08-10
    Description: The Weddell Sea sector is one of the main formation sites for Antarctic Bottom Water and an outlet for about one fifth of Antarctica’s continental ice volume. Over the last few decades, studies on glacialegeological records in this sector have provided conflicting reconstructions of changes in ice-sheet extent and ice-sheet thickness since the Last Glacial Maximum (LGM at ca 23e19 calibrated kiloyears before present, cal ka BP). Terrestrial geomorphological records and exposure ages obtained from rocks in the hinterland of the Weddell Sea, ice-sheet thickness constraints from ice cores and some radiocarbon dates on offshore sediments were interpreted to indicate no significant ice thickening and locally restricted grounding-line advance at the LGM. Other marine geological and geophysical studies concluded that subglacial bedforms mapped on theWeddell Sea continental shelf, subglacial deposits and sediments over-compacted by overriding ice recovered in cores, and the few available radiocarbon ages from marine sediments are consistent with major ice-sheet advance at the LGM. Reflecting the geological interpretations, different icesheet models have reconstructed conflicting LGM ice-sheet configurations for the Weddell Sea sector. Consequently, the estimated contributions of ice-sheet build-up in the Weddell Sea sector to the LGM sealevel low-stand of w130 m vary considerably. In this paper, we summarise and review the geological records of past ice-sheet margins and past icesheet elevations in the Weddell Sea sector. We compile marine and terrestrial chronological data constraining former ice-sheet size, thereby highlighting different levels of certainty, and present two alternative scenarios of the LGM ice-sheet configuration, including time-slice reconstructions for post- LGM grounding-line retreat. Moreover, we discuss consistencies and possible reasons for inconsistencies between the various reconstructions and propose objectives for future research. The aim of our study is to provide two alternative interpretations of glacialegeological datasets on Antarctic Ice- Sheet History for the Weddell Sea sector, which can be utilised to test and improve numerical icesheet models
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 5
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Beacon valley (77° S, 161°E) is near the peripheral Taylor dome of the East Antarctic ice sheet. The present-day mean annual temperature is -30 to -35 °C and precipitation is less than 10 mm water equivalent per year11'12. The valley is bordered by mountains rising to ...
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2015-12-21
    Description: This article is currently available as a free download on ingentaconnect
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
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