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Glaciated Continental Margins

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Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 207/5 ( reviews)

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Book Synopsis Glaciated Continental Margins by : Thomas A. Davies

Download or read book Glaciated Continental Margins written by Thomas A. Davies. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: Late Cenozoic glaciation directly affected sedimentation on more than half the Earth's continental shelves. Ice continues to be a dominant influence on sedimentation around Greenland and Antarctica, and on the shelves facing the Arctic Ocean. The features of these shelves include true glacimarine features, i.e. those found in a marine environment in proximityto, or strongly under the influence of, ice, such as iceberg scours and pits, ice gouges and incisions, subglacial outwash deposits, and diamictons resulting from ice rafting. Also seen, because large areas of the shelves were exposed during the Pleistocene lowering of sea level, are terrestrial glacial and periglacial features, e.g. fluvial outwash valleys and associated deposits, tunnel valleys, drumlin fields and lodgement till, which have subsequently been submerged and modified by marine influences. Glaciated Continental Margins: An Atlas of Acoustic Images illustrates the complexity of features found in glaciated and formerly glaciated marine environments. The volume was assembled by an international Editorial Committee, led by Thomas A. Davies (University of Texas), from records gathered in the course of recent research and contributed by members of the scientific community from around the world. These include seismic sections, side-scan maps, and 3-D seismic data, supplemented in some cases by bottom photographs and core data, with accompanying text. The work is scientists at 40 institutions in 10 countries is represented. This book will be an invaluable resource for students, Quaternary scientists, glaciologists, marine geologists and geophysicists, geotechnical engineers, and surveyors teachers working in universities, research institutions and government agencies with interests in polar and subpolar regions, as well as those in industries with offshore interests.

Glaciated Margins

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Release : 2019-04-08
Genre : Science
Kind : eBook
Book Rating : 979/5 ( reviews)

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Book Synopsis Glaciated Margins by : D.P. Le Heron

Download or read book Glaciated Margins written by D.P. Le Heron. This book was released on 2019-04-08. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the sedimentary and geophysical archive of glaciated margins is a complex task that requires integration and analysis of disparate sedimentological and geophysical data. Their analysis is vital for understanding the dynamics of past ice sheets and how they interact with their neighbouring marine basins, on timescales that cannot be captured by observations of the cryosphere today. As resources, sediments deposited on the inner margins of glaciated shelves also exhibit resource potential where more sand-dominated systems occur, acting as reservoirs for both hydrocarbons and water. This book surveys the full gamut of glaciated margins, from deep time (Neoproterozoic, Ordovician and Carboniferous–Permian) to modern high-latitude margins in Canada and Antarctica. This collection of papers is the first attempt to deliberately do this, allowing not only the similarities and differences between modern and ancient glaciated margins to be explored, but also the wide spectrum of their mechanisms of investigation to be probed. Together, these papers offer a high-resolution, spatially and temporally diverse blueprint of the depositional processes, ice sheet dynamics, and basin architectures of the world’s former glaciated margins; a vital resource in advancing understanding of our present and future marine-terminating ice sheet margins.

Depositional Successions on Glaciated Continental Margins [microform] : the Cenozoic of Antarctica and the Neoproterozoic of Rodinia

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Release : 2004
Genre :
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Book Rating : 453/5 ( reviews)

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Book Synopsis Depositional Successions on Glaciated Continental Margins [microform] : the Cenozoic of Antarctica and the Neoproterozoic of Rodinia by : Nicole N. (Nicole Naomi) Januszczak

Download or read book Depositional Successions on Glaciated Continental Margins [microform] : the Cenozoic of Antarctica and the Neoproterozoic of Rodinia written by Nicole N. (Nicole Naomi) Januszczak. This book was released on 2004. Available in PDF, EPUB and Kindle. Book excerpt: Part II of this thesis focuses on the sedimentological and stratigraphic evidence for glaciation in the Neoproterozoic. Integrating this analysis with a recent understanding of the tectonic setting of Neoproterozoic sedimentary basins provides a basis for an alternative 'zipper-rift' hypothesis for Neoproterozoic glaciations. The 'zipper-rift' model emphasizes a strong linkage between the first-order reorganisation of the Earth's surface created by rifting of Rodinia, the climatic effects of uplifted rift flanks and the resulting sedimentary record deposited in newly formed rift basins. Neoproterozoic glaciation was regional in extent, strongly controlled by tectonics and diachronous in its timing as Rodinia progressively broke apart over some 150 million years. This thesis is presented in two parts. The first half deals with the Cenozoic glacial record of Antarctica and the second half focuses on the Neoproterozoic glacial record of Rodinia. The glacially-influenced Cenozoic continental margin of Antarctica shows a large-scale subsurface seismic stratigraphy consisting of flat-lying 'topsets' recording episodic aggradation of the continental shelf, that rest on seaward-dipping, wedge-shaped 'foresets' formed by the progradation of the continental slope. Strata from topsets record aggradation by till deposition alternating with glacial-marine sedimentation. Strata from foresets record debris flows and turbidity currents on an active slope close to a source of poorly-sorted glacial debris such as an ice sheet margin reaching the shelf break. The original intention at the commencement of the thesis was to use depositional models derived from Antarctica as 'modern' analogues for Neoproterozoic successions. Critical evaluation of Neoproterozoic successions shows that many are not glacial in origin. Many Neoproterozoic 'glacial' successions have been identified as glacial on the basis of the presence of diamictite facies. Diamictite facies are commonly present within thick turbidite successions and are the product of active rifting and the shedding of poorly sorted debris into rapidly subsiding marine rift basins. The sedimentary record from the continental shelf of Prydz Bay, East Antarctica was examined by Ocean Drilling Program Leg 188. This record constrains the onset of glaciation in Antarctica to the late Eocene (c. 39 Ma) and records an important interval in the history of Antarctica, capturing for the first time the transition from a warmer preglacial climate, through early-glacial, and culminating in continental-scale glaciation of Antarctica.

Glacier-influenced Sedimentation on High-latitude Continental Margins

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Release : 2002
Genre : Nature
Kind : eBook
Book Rating : 208/5 ( reviews)

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Book Synopsis Glacier-influenced Sedimentation on High-latitude Continental Margins by : J. A. Dowdeswell

Download or read book Glacier-influenced Sedimentation on High-latitude Continental Margins written by J. A. Dowdeswell. This book was released on 2002. 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.

Sedimentary Development of Glaciated Continental Margins

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Release : 1995
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Book Synopsis Sedimentary Development of Glaciated Continental Margins by : Espen Sletten Andersen

Download or read book Sedimentary Development of Glaciated Continental Margins written by Espen Sletten Andersen. This book was released on 1995. Available in PDF, EPUB and Kindle. Book excerpt:

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