Download or read book Sediment Flux East Greenland Margin written by and published by . This book was released on 1991 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: We investigated sediment flux across an ice-dominated, high latitude continental margin, using cores from the East Greenland Shelf (ca. 68 deg N). Density, weight percentages of the various sediment components, and sediment/age relations (AMS C- 14 dates) were investigated from cores collected 1988 and 1990. High-resolution DTS Huntec surveys indicated 10-20 m of acoustically transparent sediment. Maximum core length was 3 m and most of the gravity cores were between 1-2 m. The radiocarbon assays show that basal core sediments date between ca. 9,000 and 14,500 BP. The acoustic characteristics, the low dry volume densities (ca. 600 kg/m3 and the faunal and floral assemblages suggest ice-distal conditions between ca. 14,500 and the present. Net sediment flux in the Kangerdlugssuaq Trough during the last 14,500 years has been low; this might be explained by either (1) cold-based glaciological conditions of the East Greenland ice sheet; and/or (2) efficient sediment trap(s) lying along the inner shelf/fjords of East Greenland.
Download or read book Glacier influenced Sedimentation on High latitude Continental Margins written by J. A. Dowdeswell and published by Geological Society of London. This book was released on 2002 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the process and patterns of glacier-influenced sedimentation on high-latitude continental margins and the geophysical and geological signatures of the resulting sediments and landforms. It contains a range of papers concerning modern and glacially-influenced sedimentation in high-latitude areas from both hemispheres, many of which discuss the relationship between glacier dynamics and the sediments and landforms preserved in the glacimarine environment.
Download or read book Sedimentation History Along the East Greenland Margin written by Daniela Berger and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2010 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The change in global climate is one of the highly speculative aspects in the Northern Hemipsphere, especially the onset of glaciation. Advances and retreats of grounded ice sheets during glacial- interglacial times play an important role in terms of the deposition of large sediment deposits. Depositional patterns on the continental slope and rise reflect interactions between the effects of ice sheet fluctuations, mass transport processes and bottom currents. A for the first time applied seismostratigraphy on the Northeast Greenland margin made it possible to differentiate between glacial (younger than Middle Miocene) and pre-glacial (older than Middle Miocene) sediment units. Glacial advances and retreats appear not to have been synchronous along the continental margin. Therefore, either north of 70 N the extension of the shelf by glacial erosion seems to be more intensive like on the Southeast Greenland margin or the onset of glaciation started earlier in the north than in the south. This study demonstrates the interaction between sediment accumulation, climatic changes and changes in ocean circulation.
Download or read book Sedimentation History Along the East Greenland Margin written by Daniela Berger and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Material Fluxes on the Surface of the Earth written by National Research Council and published by National Academies Press. This book was released on 1994-02-01 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the ebb and flow of materials on the earth's surface is vital to comprehending environmental change. We need to differentiate between those that represent a progression of natural events from those that might be human induced. The latter can be managed by changing policies; the former probably cannot. This volume presents what researchers know and do not know about the base (or natural) level of surficial fluxes and their dynamics. Leading experts in the field offer a historical perspective on geofluxes and discuss the cycles of materials on the earth's surface, from weathering processes to the movement of material through the river system and oceans to their deposition. The committee sets research directions in five areas: shallow-water studies, mapping, rates of change, sample dating, andâ€"most criticalâ€"understanding whether human influence can exceed the natural variability in geoflux processes. This volume will be important reading for geophysical scientists, researchers, faculty, and students, as well as environmental policymakers.
Download or read book Sediment Transport written by Faruk Bhuiyan and published by BoD – Books on Demand. This book was released on 2011-10-26 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to put together recent developments on sediment transport and morphological processes. There are twelve chapters in this book contributed by different authors who are currently involved in relevant research. First three chapters provide information on basic and advanced flow mechanisms including turbulence and movement of particles in water. Examples of computational procedures for sediment transport and morphological changes are given in the next five chapters. These include empirical predictions and numerical computations. Chapters nine and ten present some insights on environmental concerns with sediment transport. Last two contributions deal with two large-scale case studies related to changes in the transport and provenance of glacial marine sediments, and processes involving land slides.
Download or read book Continental Margin Sedimentation written by Charles A. Nittrouer and published by John Wiley & Sons. This book was released on 2009-03-12 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume on continental margin sedimentation brings together an expert editorial and contributor team to create a state-of-the-art resource. Taking a global perspective, the book spans a range of timescales and content, ranging from how oceans transport particles, to how thick rock sequences are formed on continental margins. Summarizes and integrates our understanding of sedimentary processes and strata associated with fluvial dispersal systems on continental shelves and slopes Explores timescales ranging from particle transport at one extreme, to deep burial at the other Insights are presented for margins in general, and with focus on a tectonically active margin (northern California) and a passive margin (New Jersey), enabling detailed examination of the intricate relationships between a wide suite of sedimentary processes and their preserved stratigraphy Includes observational studies which document the processes and strata found on particular margins, in addition to numerical models and laboratory experimentation, which provide a quantitative basis for extrapolation in time and space of insights about continental-margin sedimentation Provides a research resource for scientists studying modern and ancient margins, and an educational text for advanced students in sedimentology and stratigraphy
Download or read book Geology and Geophysics Program Summary for FY written by and published by . This book was released on 1990 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Quaternary Palaeoceanography of the North Atlantic Margins written by John T. Andrews and published by Geological Society of London. This book was released on 1996 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this book is on oceanic climate change during the last deglaciation period and the high temporal resolution that can be obtained from sediment records at continental margin sites. The book draws together papers from the north-eastern North American continental margin with those from the north-west European Arctic and the Arctic and North Atlantic Oceans.
Download or read book Sediment Flux in a Fiord Shelf Transect of an Ice Dominated Continental Margin written by John T. Andrews and published by . This book was released on 1987 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Piston cores from fiords along the eastern margin of Baffin Island, N>W>T> are being studied in order to compute variations in sediment flux on time scales of decades to thousands of years. Radiocarbon dates indicate that the sedimentation rates in outer basins range, on average, between 20-50cm/THAT'S NUMBER: 1 (NOT ALPHA)ka. The cores extend back to ca. 10 ka, or earlier, and provide possible analogs for conditions around the present day Greenland Ice Sheet. Grain size, grain shape and mineralogical studies are being carried out in order to evaluate down fiord variations in sediment source and sedimentation processes.
Download or read book From Depositional Systems to Sedimentary Successions on the Norwegian Continental Margin written by Allard W. Martinius and published by John Wiley & Sons. This book was released on 2014-07-18 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Norwegian Continental Shelf (NCS), focus of this special publication, is a prolific hydrocarbon region and both exploration and production activity remains high to this day with a positive production outlook. A key element today and in the future is to couple technological developments to improving our understanding of specific geological situations. The theme of the publication reflects the immense efforts made by all industry operators and their academic partners on the NCS to understand in detail the structural setting, sedimentology and stratigraphy of the hydrocarbon bearing units and their source and seal. The papers cover a wide spectrum of depositional environments ranging from alluvial fans to deepwater fans, in almost every climate type from arid through humid to glacial, and in a variety of tectonic settings. Special attention is given to the integration of both analogue studies and process-based models with the insights gained from extensive subsurface datasets.
Download or read book The Northern North Atlantic written by Priska Schäfer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: The northern North Atlantic is one of the regions most sensitive to past and present global changes. This book integrates the results of an interdisciplinary project studying the properties of the Greenland-Iceland-Norwegian Seas and the processes of pelagic and benthic particle formation, particle transport, and deposition in the deep-sea sediments. Ice-related and biogeochemical processes have been investigated to decipher the spatial and temporal variability of the production and fate of organic carbon in this region. Isotopic stratigraphy, microfossil assemblages and paleotemperatures are combined to reconstruct paleoceanographic conditions and to model past climatic changes in the Late Quaternary. The Greenland-Iceland-Norwegian Seas can now be considered one of the best studied subbasins of the world`s oceans.
Download or read book Arctic Ocean Sediments Processes Proxies and Paleoenvironment written by R. Stein and published by Elsevier. This book was released on 2008-07-22 with total page 607 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although it is generally accepted that the Arctic Ocean is a very sensitive and important region for changes in the global climate, this region is the last major physiographic province of the earth whose short-and long-term geological history is much less known in comparison to other ocean regions. This lack of knowledge is mainly caused by the major technological/logistic problems in reaching this harsh, ice-covered region with normal research vessels and in retrieving long and undisturbed sediment cores. During the the last about 20 years, however, several international and multidisciplinary ship expeditions, including the first scientific drilling on Lomonosov Ridge in 2004, a break-through in Arctic research, were carried out into the central Artic and its surrounding shelf seas. Results from these expeditions have greatly advanced our knowledge on Arctic Ocean paleoenvironments. Published syntheses about the knowledge on Arctic Ocean geology, on the other hand, are based on data available prior to 1990. A comprehensive compilation of data on Arctic Ocean paleoenvironment and its short-and long-term variability based on the huge amount of new data including the ACEX drilling data, has not been available yet. With this book, presenting (1) detailed information on glacio-marine sedimentary processes and geological proxies used for paleoenvironmental reconstructions, and (2) detailed geological data on modern environments, Quaternary variability on different time scales as well as the long-term climate history during Mesozoic-Tertiary times, this gap in knowledge will be filled.*Aimed at specialists and graduates *Presents background research, recent developments, and future trends*Written by a leading scholar and industry expert
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1993 with total page 1094 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atlas of Submarine Glacial Landforms written by J.A. Dowdeswell and published by Geological Society of London. This book was released on 2016-12-16 with total page 631 pages. Available in PDF, EPUB and Kindle. Book excerpt: New geophysical techniques (multibeam echo sounding and 3D seismics) have revolutionized high-resolution imaging of the modern seafloor and palaeo-shelf surfaces in Arctic and Antarctic waters, generating vast quantities of data and novel insights into sedimentary architecture and past environmental conditions. The Atlas of Submarine Glacial Landforms is a comprehensive and timely summary of the current state of knowledge of these high-latitude glacier-influenced systems. The Atlas presents over 180 contributions describing, illustrating and discussing the full variability of landforms found on the high-latitude glacier-influenced seafloor, from fjords and continental shelves to the continental slope, rise and deep-sea basins beyond. The distribution and geometry of these submarine landforms provide key information on past ice-sheet extent and the direction and nature of ice flow and dynamics. The papers discuss individual seafloor landforms, landform assemblages and entire landsystems from relatively mild to extreme glacimarine climatic settings and on timescales from the modern margins of tidewater glaciers, through Quaternary examples to ancient glaciations in the Late Ordovician.
Download or read book Past Glacial Environments written by John Menzies and published by Elsevier. This book was released on 2017-11-28 with total page 859 pages. Available in PDF, EPUB and Kindle. Book excerpt: Past Glacial Environments, Second Edition, presents a revised and updated version of the very successful first edition of Menzies' book, covering a breadth of topics with a focus on the recognition and analysis of former glacial environments, including the pre-Quaternary glaciations. The book is made up of chapters written by various geological experts from across the world, with the editor's expertise and experience bringing the chapters together. This new and updated volume includes at least 45% new material, along with five new chapters that include a section on techniques and methods. Additionally, this new edition is presented in full color and features a large collection of photographs, line diagrams, and tables with examples of glacial environments and landscapes that are drawn from a worldwide perspective. Informative knowledge boxes and case studies are included, helping users better understand critical issues and ideas. - Provides the most complete reference concerning the study of glacial processes and their geological, sedimentological, and geomorphological products - Comprised of chapters written by various geological experts from across the world - Includes specific case studies to alert readers to important ideas and issues - Uses text boxes throughout to explain key concepts from glacial literature - Presents full color photographs, line diagrams, and tables throughout
Download or read book Arctic Geology and Petroleum Potential written by T.O. Vorren and published by Elsevier. This book was released on 2013-10-22 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the search for hydrocarbon resources in the Arctic started in the 1930's the exploration activity has expanded into many of the Arctic regions, and several of the Arctic sedimentary basins have proven to be important sources of hydrocarbon. Nevertheless, the Arctic continental margins and adjacent onshore areas are still largely unexplored in the context of petroleum, and are therefore considered to be one of the few regions in the world where significant undiscovered sources of hydrocarbon may exist. The aim of the book is to give an updated overview of the geology of the Arctic sedimentary basins and their petroleum potential. Although the different basins vary significantly as regards sedimentary fill and tectonic evolution, many of the basins share some of the characteristics needed to become prolific oil and gas provinces. The book contains 45 extensively illustrated articles. It starts with papers on the Mesozoic source rocks, and oceanic natural gas clatrates in the Arctic, respectively. Then follow articles on the regional and petroleum geology of the main regions; Greenland, North American Arctic, Soviet Arctic and the Barents Sea. Particular emphasis is placed on the Barents Sea. The two last chapters comprise articles on salt dynamics and methods. The book closes with a paper on international law in the Arctic. This volume will be of interest to both students and professional earth scientists/petroleum explorationists working in the northern latitudes. It will allow the readers to stay abreast of the development in this climatic region of the world.
