Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 148 for “"glaciation"”.
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The glaciation of central Ayrshire
Summary available: p. [15]
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Effects of Glaciation on Volcanism in Iceland
… eruption rates in Iceland during the last deglaciation increased 5--30 fold from the steady-state rates. This has been understood by the unloading of ice, which increases the decompression rates in the mantle, causing enhanced mantle melting rates. However, existing theoretical work cannot …
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Supercontinents and glaciation: a perspective from western Gondwana.
… glacial and secondly the spatial extent of these glaciations. This thesis addresses these deficits in our knowledge by presenting detailed sedimentology, geochronology, palaeomagnetic results from western Gondwana. The Cryogenian-aged Toekems Sub-basin in the Damara Belt, Namibia comprises a wedge …
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Quaternary glaciation in the Pindus Mountains, Northwest Greece
… and geological evidence for former Quaternary glaciation has been mapped n the Pindus Mountains of Northwest Greece. the dynamics and chronology of glaciation in this area has been established through sedimentological analysis, soil analysis and Uranium-series dating. Four glacial events are …
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Geochronological constraints on the Trinity diamictite in Newfoundland : Implications for Ediacaran glaciation
… which has been associated with a Snowball glaciation event. The complicated regional stratigraphy and lack of precise geochronological constraints has made it difficult to determine the spatial and temporal extent of the Gaskiers glaciation. Recent recognition of a diamictite facies on the …
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Orbital and Suborbital Climate Variability during the Pliocene Intensification of Northern Hemisphere Glaciation
… The intensification of northern hemisphere glaciation<br/>(iNHG) central to this climatic transition was accompanied by a decrease in atmospheric<br/>carbon dioxide concentrations and commenced around 3.5 million years ago. The climate<br/>forcing and response mechanisms involved in the iNHG …
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The impact of glaciation and climate change on biogeochemical cycling and landscape development
Lake cores from Dry Lake, California and Crystal Lake, Illinois were analyzed to identify climate variability and characterize landscape response to glacial/deglacial climate transitions. Geochemical analysis of the Dry Lake sediment prior to the 8.2 kyr event revealed average values for percent …
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BIOMINERALIZATION AND GLOBAL CHANGE: BIOTIC RESPONSE TO THE GONDWANAN GLACIATION AND SUBSEQUENT CLIMATE WARMING
… glacial meltwater following the intense deglaciation occurring from the early Sakmarian. A sclerochemical δ11B profile was also measured on this specimen, and shows that δ11B also record oscillating values, which trans-late to pH variations. The frequency of these oscillations, however, is …
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Depth and orbital tuning : a new chronology of glaciation and nonlinear orbital climate change
… casts a false light upon the chronology of glaciation and the understanding of the climatic response to orbital variations. By developing a new age-model, independent of orbital assumptions, a significant non-linear response to orbital forcing becomes evident in the [delta] 18 0 record. The …
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The Mall Bay Formation (Ediacaran) and the Protracted Onset of the Gaskiers Glaciation in Newfoundland, Canada
The Gaskiers glaciation (580 Ma) immediately preceded the appearance of the Earth’s first large, complex, soft-bodied, fossils of the Ediacara biota. The Gaskiers glaciation is generally regarded as being short-lived and confined to the stratigraphic extent of the Gaskiers Formation in eastern …
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Mixed Carbonate-Siliciclastic Sequence Development and Chemostratigraphy On a Distal Foreland During Miocene Glaciation, Eastern Saudi Arabia
… of glacio-esustasy during moderate Antarctic glaciation, within a small back bulge basin on the slowly subsiding distal Arabian foreland, distal from the active Zagros fold-thrust belt. Low subsidence rates of 1 to 4 cm/k.y generated the long-term accommodation, which were considerable slower …
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Effects of climate change on mammalian fauna composition and structure during the advent of North American continental glaciation in the Pliocene
… the beginning of North American continental glaciation is beautifully represented by the thick fluvial and lacustrine sequences of the Pliocene Glenns Ferry Formation at the Hagerman Fossil Beds National Monument (HAFO), Idaho. This time interval is commonly studied because it contains the …
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Sedimentology of the Squantum ‘Tillite’, Boston Basin, USA: Modern Analogues and Implications for the Paleoclimate during the Gaskiers Glaciation (c. 580 Ma)
The Gaskiers glaciation (c. 580 Ma) has been classically traced along the Neoproterozoic Avalonian-Cadomian Terranes, which are now found scattered around the North Atlantic Ocean. Around 625 Ma these terranes were composed of volcanoes and arc-type basins. ‘Till-like’ diamictite horizons …
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The Pleistocene History of the Birmingham District
… sediments attributed to at least three lowland glaciations (Anglian, Wolstonian, and Devensian) as well as a variety of non-glacial sediments. Understanding the age of the Pleistocene glacial deposits is critical to reconstructing the palaeoenvironmental history of the district and its …
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Stratigraphy and history of the Sakakawea Sequence, south-central North Dakota
… flowed toward Hudson Bay. With the initiation of glaciation, ice blocked the rivers and forced them to flow southward.</p> <p>During the Pleistocene at least four major glaciations occurred. The Dunn Glaciation was pre-Wisconsinan that Verone Glaciation was post Dunn and pre-Napoleon, the Napoleon …
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The use of 10Be surface exposure dating of erratic boulders in the reconstruction of the late Pleistocene glaciation history of mountainous regions, with examples from Nepal and Central Asia
… to have shifted as far south as to affect glaciation all over the Himalaya. During the Younger Dryas, the eastern limit of the influence of the westerly circulation on Himalaya glaciation may have been situated between the Manaslu and Langtang Himal. Glacial advances in the Pamir and in the …
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Post-Orogenic Exhumation and Glacial Erosion on the Flanks of the North Atlantic
… or climatic events. The onset of late Cenozoic glaciation, often associated with enhanced rates of erosion, is one such possible cause of passive margin rejuvenation. However, along passive margins the effectiveness of Plio-Pleistocene glaciers at eroding the landscape may be limited by low …
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Applying GIS Metrics to Determine Degree of Glacial Modification in Mountainous Landscapes
… ability to quantitatively assess the degree of glaciation in mountainous areas can be a powerful tool in unraveling the evolution of landscapes, and provide key insights in regions where field research is difficult. Here we determine, test, and apply metrics that assess the relative degree of …
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Climatic factors influencing Last Glacial Maximum and modern glacial conditions in the tropical and subtropical Andes
… sustained glaciers. However, the timing of glaciation and the mechanisms driving it are still poorly known. This study uses a full surface energy and mass balance model, driven using general circulation model output, to better understand the potential for past glaciation in the region and to …
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