Author: Friends of the Pleistocene. Pacific Northwest Cell. Field ConferencePublisher:
ISBN:
Category : Geology
Languages : en
Pages :
Book Description
Quaternary Glaciation and Tectonism on the Western Olympic Peninsula, Washington
Author: Friends of the Pleistocene. Pacific Northwest Cell. Field ConferencePublisher:
ISBN:
Category : Geology
Languages : en
Pages :
Book Description
The Interaction of Climate, Tectonics, and Topography in the Olympic Mountains of Washington State: the Influence of Erosion on Tectonic Steady-state and the Synthesis of the Alpine Glacial History
Author: Jessica L. HellwigPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The interaction of climate, tectonics, and topography in the Olympic Mountains of Washington State is explored to determine the influence of glaciers on spatially variable erosion and rock uplift rates. As glaciers have long been present on the peninsula, could glacial erosion explain the observed pattern of rock uplift? A numerical model of glacial flow, ICE Cascade, is used to reconstruct the glacial extent of the Last Glacial Maximum for the first time. Modeled ice extent best matches observations when summer temperatures range from 7.0-8.0°C and precipitation is reduced to 0.4-0.8 times the modern. These values are consistent with paleoclimate records. Simulated glacial erosion based on a sliding law varies with observed trends in rock uplift rates across the peninsula. If erosion rates are assumed to equal rock uplift rates, as suggested by evidence of tectonic steady state in the region, a glacial erosion constant on the order of 10-5 is indicated based on modeled sliding rates in three valleys on the western side of the range. These efforts are hampered by the lack of a glacial and paleoclimate record from the northern and eastern peninsula. A regional growth curve for lichenometric dating of neoglacial moraines is developed and applied to four moraines at the base of Royal Glacier on Mt. Deception. The moraines range in age from 1839±45, 1895±45, and 1963±45, to less than 20±45 years. The estimated equilibrium line altitude (ELA) for Royal Glacier during this time is 1774 m as compared with 1688 m for Blue Glacier in the western Olympics over the same period. A compendium of glacial deposits observed throughout the peninsula is also summarized so a broader picture of the alpine glacial extent and continental ice extent can be developed. Overall, this work demonstrates that the sliding based glacial erosion model can explain the uplift pattern when the glacial erosion constant is on the order of 10-5 in three separate river valleys. Additional work on the northern and eastern sides of the peninsula would allow for a broader picture of the glacial history and provide a closer glacial erosion constant in the model. The culmination of work in these areas allows for a greater understanding of how climate, erosion, and tectonics interact on the Olympic Peninsula.
Western Cordillera and Adjacent Areas
Author: Terry W SwansonPublisher: Geological Society of America
ISBN: 9780813700045
Category : Science
Languages : en
Pages : 292
Book Description
This title includes guides for field trips held in conjunction with the 2003 GSA Annual Meeting in Seattle. Topics covered include Glacial Lake Missoula and the Clark Fork Ice Dam; the Sauk Sequence in Utah; the geology of wine in Washington state; the Columbia River basalt and Yakima Fold Belt; Alpine glaciation of the North Cascades; and recent geoarchaeological discoveries in central Washington. Quaternary geology of Seattle, engineering geology in the central Columbia Valley, and the tephrostratigraphy and paleogeography of southern Puget Sound are also covered.
Rivers Over Rock
Author: Keith J. TinklerPublisher: American Geophysical Union
ISBN: 0875900909
Category : Science
Languages : en
Pages : 325
Book Description
Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 107. Bedrock river channels are sites of primary erosion in the landscape, fixing the baselevel for all points upstream. This volume provides for the first time an integrated view of the characteristics and operation of this important, though hitherto neglected, class of channels. Examples are provided from several continents and cover a wide range of spatial scales from the large river basins (such as the Colorado River in the United States and the Indus River in Pakistan) down to reach scales and individual sites. Likewise the geologic timescales considered range from erosion and transportation during individual flows to accumulated effects over periods of tens of millions of years.
U.S. Geological Survey Professional Paper
Author: Coastal Tectonics
Author: Iain S. StewartPublisher: Geological Society of London
ISBN: 9781862390249
Category : Nature
Languages : en
Pages : 390
Book Description
Washington Geology
Author: Geological Survey Professional Paper
Author: Late Quaternary Climate, Tectonism, and Sedimentation in Clear Lake, Northern California Coast Ranges
Author: John D. SimsPublisher: Geological Society of America
ISBN: 0813722144
Category : Science
Languages : en
Pages : 235
Book Description
Quaternary Glaciations in the Northern Hemisphere
Author: Vladimír ŠibravaPublisher:
ISBN:
Category : Geology
Languages : en
Pages : 544
Book Description