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Late Wisconsin Glacial Chronology Of The North Central Alaska Range
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Book Synopsis Late Wisconsin Glacial Chronology of the North-central Alaska Range by : Norman W. ten Brink
Download or read book Late Wisconsin Glacial Chronology of the North-central Alaska Range written by Norman W. ten Brink and published by . This book was released on 1980* with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The objectives of this paper ... are (1) to present a synopsis of the rapidly developing current data on Alaska Range glaciogenic deposits, and (2) to provide a preliminary regional synthesis of the late Wisconsin glacial history indicated by the data in hand."--Leaf 2.
Book Synopsis Improving the Late Pleistocene and Holocene Glacial Chronology in the Central Alaska Range by : Nicolas E. Young
Download or read book Improving the Late Pleistocene and Holocene Glacial Chronology in the Central Alaska Range written by Nicolas E. Young and published by . This book was released on 2008 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: A chronology of glaciation spanning from the late Pleistocene through the late Holocene is constructed for Fish Lake valley in the central Alaska Range using 10Be surface exposure dating and lichenometry. Ice initially retreated from its Last Glacial Maximum terminal position -22 ka and remained close to its maximum ice extent as late as 16.5 ka. Glaciers retreated well into the cirque region by 15-14 ka, before a late Pleistocene re-advance. Culminating by 11.6 ka, limited evidence indicates a late Pleistocene re-advance in Fish Lake valley may be coincident with the North Atlantic Younger Dryas event (12.9 - 11.6 kya). This adds to the growing amount of evidence in Alaska suggesting that glaciers were advancing in response to Younger Dryas related cooling. Late Holocene moraines pre-dating the Little Ice Age (LIA; -AD 1250-1850) are preserved immediately in front of LIA moraines and a minimum age of 3.3-3.0 ka on one moraine marks the oldest Neoglacial moraine preserved in the valley agreeing with regional glacier advances. Subsequent advances occurred in the middle to late First Millennium AD and pulses of LIA glaciation are recorded at AD 1290, 1640, 1860 and 1910. Preservation of the pre-LIA late Holocene moraines suggests that the magnitude of several late Holocene glacial advances were similar. This finding is consistent with moraine records in the Brooks Range, but contradictory to findings in southern Alaska. The innermost moraine crest, lichenometrically dated to AD 1930, indicates that the current glacier terminus has retread approximately 1.3 km to its AD 2007 position. Comparisons of 10 Be and lichenometric ages on late Holocene moraines show remarkable similarity and add confidence for using the regional lichenometric growth curve to date surficial deposits. Results indicate that 10 Be surface exposure dating can be used to constrain the timing of Holocene glacier fluctuations in Alaska; more so when supplemented with well constrained lichenometric ages.
Book Synopsis Quaternary Glaciations - Extent and Chronology by : J. Ehlers
Download or read book Quaternary Glaciations - Extent and Chronology written by J. Ehlers and published by Elsevier. This book was released on 2004-10-02 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the second of three volumes in which the recent knowledge of the extent and chronology of Quaternary glaciations has been compiled on a global scale. This information is seen as a fundamental requirement, not only for the glacial community, but for the wider user-community of general Quaternary workers. In particular the need for accurate ice-front positions is a basic requirement for the rapidly growing field of palaeoclimate modelling. In order to provide the information for the widest-possible range of users in the most accessible form, a series of digital maps was prepared. The glacial limits were mapped in ArcView, the Geographical Information System (GIS) used by the work group. Included with the publication is a CD with digital maps, showing glacial limits, end moraines, ice-dammed lakes, glacier-induced drainage diversions and the locations of key sections through which the glacial limits are defined and dated. The last deglaciation is also shown in 500 year time-steps. The digital maps in this volume cover the USA and Canada and include Greenland and Hawaii. Both overview maps and more detailed maps at a scale 1: 1,000,000 are provided. Also available:Part I: Europe, ISBN 0-444-51462-7Part III: South America, Asia, Africa, Australia, Antarctica, ISBN 0-444-51593-3
Book Synopsis 10Be Chronology of Late Pleistocene and Holocene Glaciation of the Alapah Mountain and Arrigetch Peaks Areas, Central Brooks Range, Alaska by : Simon L. Pendleton
Download or read book 10Be Chronology of Late Pleistocene and Holocene Glaciation of the Alapah Mountain and Arrigetch Peaks Areas, Central Brooks Range, Alaska written by Simon L. Pendleton and published by . This book was released on 2013 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The amplification of climate change in the Arctic is due to several cyrosphere related feedback mechanisms, making it one of the most climate sensitive environments in the world. Due to this sensitivity, glaciers in this region are excellent recorders of past climate fluctuations. This high-resolution chronology left on the land by these glaciers is an important link in deciphering the dynamic relationship between glaciers and climate, leading to a better understanding of the extent and magnitude of past Arctic climate variability. Here we present new 10Be based glacier chronologies from the late Pleistocene through the Little Ice Age (LIA) for two valleys located in the north- and south-central Brooks range, Alaska. Moraine boulders from the Alapah Mountain moraines on the northern flank of the range indicate that the Itkillik III glaciation culminated by ~17 ka. This age is much older than previous estimates (~15-13 ka) and suggests a revision of the original late Pleistocene glacial chronology. This new Itkillik chronology requires substantial glacial retreat between ~27-23 ka, at the height of the northern hemisphere last glacial maximum (LGM). Due to their moisture sensitivity, expanded Arctic sea ice may have starved glaciers of precipitation during this time. Erratic boulders and scoured bedrock from several valleys in both the northern and southern Brooks Range show that deglaciation was underway by ~16 ka and glaciers retreated rapidly up valley to their Neoglacial limits, in some case by 14. 9 ℗ł 0. 8 ka. Sampled boulders from two Neoglacial moraines show that glaciers reached their maximum Holocene extent by 3. 2 ℗ł 0. 3 ka. In conjunction, these ages show that glaciers remained at or behind their Holocene maximum from ~14-3 ka. This means that Late Glacial (14-11 ka) or early to middle Holocene advances were either absent or less extensive than their Holocene maximum.
Book Synopsis Quaternary Glaciations by : Jürgen Ehlers
Download or read book Quaternary Glaciations written by Jürgen Ehlers and published by . This book was released on 2004 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pt. 1. Europe -- pt. 2. North America -- pt. 3. South America, Asia, Africa, Australia, Antarctica.
Book Synopsis Late Pleistocene Glacial Chronology of the Western Ahklun Mountains, Southwestern Alaska by : Jason P. Briner
Download or read book Late Pleistocene Glacial Chronology of the Western Ahklun Mountains, Southwestern Alaska written by Jason P. Briner and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: New glacial mapping and 35 cosmogenic 36Cl surface exposure ages, the first ever reported from Alaska , constrain the extent and timing of late Pleistocene glacial fluctuations in the western Ahklun Mountain s, southwe stern Alaska. Morphometric and soil relativeage data characterize two main drift units deposited during the Arolik Lake and Klak Creek glaciations , named herein. During the Arolik Lake glaciation (early Wisconsin), outlet glaciers emanated from an ice cap over the central portion of the Ahklun Mountains and deposited moraines at or beyond the modern coast. These moraines have slope angles averaging about 11℗ʻ and crests averaging about 35 m wide . Four moraine boulders deposited during this glaciation have a weighted mean surface exposure age of 53.6 ℗ł 2.0 36Cl ka. During the Klak Creek glaciation (late Wisconsin), ice-cap outlet glaciers deposited moraines 20-80 km up-valley from Arolik Lake moraines. Valley glaciers expanded from high massifs that fringe the major river valleys in the western Ahklun Mountains and terminated independently from the relatively restricted ice-cap outlet glaciers. Moraines deposited during the Klak Creek glaciation have steeper slopes (mean = -18℗ʻ) and sharper crests (mean= about 17 m) than do Arolik Lake moraines. Twenty-eight 36Cl ages were obtained from six Klak Creek moraines from three valleys and reveal two phases of glaciation during the late Wisconsin, one from about 25 to 23 36Cl ka, and another from 19 to 15 36Cl ka. An ice-cap outlet glacier moraine underlies a valley glacier terminal moraine, both of which have ages of 18-19 36Cl ka, and indicates that the ice-cap outlet glacier had retreated from its maximum position shortly before the valley glacier reached its maximum position. Equilibrium-line altitudes (ELAs) for reconstructed Klak Creek valley glaciers average about 400 m, which is only about 200 m below the estimated modem altitude. The restricted extent of Klak Creek glaciers might reflect a lack of available moisture as sea ice covered the Bering Sea during the peak of the last global glacial maximum. When compared to the marine oxygen-isotope record, the timing of glacier advances in the western Ahklun Mountains indicates that glaciers responded to both regional and global climate changes.
Book Synopsis Geological Survey Professional Paper by :
Download or read book Geological Survey Professional Paper written by and published by . This book was released on 1974 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pre-Late-Wisconsin Glacial History of the Naknek River Valley, Southwestern Alaska by : Caleb H. Thompson
Download or read book Pre-Late-Wisconsin Glacial History of the Naknek River Valley, Southwestern Alaska written by Caleb H. Thompson and published by . This book was released on 1996 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quaternary Glaciations - Extent and Chronology by : J. Ehlers
Download or read book Quaternary Glaciations - Extent and Chronology written by J. Ehlers and published by Elsevier. This book was released on 2011-06-29 with total page 1127 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents an up-to-date, detailed overview of the Quaternary glaciations all over the world, not only with regard to stratigraphy but also with regard to major glacial landforms and the extent of the respective ice sheets. The locations of key sites are included. The information is presented in digital, uniformly prepared maps which can be used in a Geographical Information System (GIS) such as ArcView or ArcGIS. The accompanying text supplies the information on how the data were obtained (geomorphology, geological mapping, air photograph evaluation, satellite imagery), how the features were dated (14C, TL, relative stratigraphy) and how reliable they are supposed to be. All references to the underlying basic publications are included. Where controversial interpretations are possible e.g. in Siberia or Tibet, this is pointed out. As a result, the information on Quaternary glaciations worldwide will be much improved and supplied in a uniform digital format. The information on the glacial limits is compiled in digital form by the coordinators of the project, and is available for download at: http://booksite.elsevier.com/9780444534477/ Completely updated detailed coverage of worldwide Quaternary glaciations Information in digital, uniformly prepared maps which can be used in a GIS such as ArcView or ArcGis Step-by-step guideline how to open and use ArcGis files Possibility to convert the shapefiles into GoogleEarth kmz-files Availability of chronological controls
Book Synopsis Geological Survey Professional Paper by : Geological Survey (U.S.)
Download or read book Geological Survey Professional Paper written by Geological Survey (U.S.) and published by . This book was released on 1975 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Geological Survey Circular by :
Download or read book U.S. Geological Survey Circular written by and published by . This book was released on 1984 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geologic Studies in Alaska by the U.S. Geological Survey, 1999 by : Frederic H. Wilson
Download or read book Geologic Studies in Alaska by the U.S. Geological Survey, 1999 written by Frederic H. Wilson and published by . This book was released on 2001 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quaternary Geology of Alaska by : Troy Lewis Péwé
Download or read book Quaternary Geology of Alaska written by Troy Lewis Péwé and published by . This book was released on 1975 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the glacial, periglacial, eolian, fluvial, lacustrine, marine, and volcanic deposits of Quaternary age in Alaska and Paleoclimatic fluctuations in light of formation and disappearance of glaciers and permafrost and changes in the distribution of plants and animals.
Book Synopsis U.S. Geological Survey Professional Paper by :
Download or read book U.S. Geological Survey Professional Paper written by and published by . This book was released on 1984 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geologic Studies in Alaska by the U.S. Geological Survey During 1987 by :
Download or read book Geologic Studies in Alaska by the U.S. Geological Survey During 1987 written by and published by . This book was released on 1988 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Late Glacial and Holocene Chronology of the Castner Glacier, Delta River Valley, Alaska by : Michael W. Howley
Download or read book A Late Glacial and Holocene Chronology of the Castner Glacier, Delta River Valley, Alaska written by Michael W. Howley and published by . This book was released on 2008 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Permafrost Response on Economic Development, Environmental Security and Natural Resources by : R. Paepe
Download or read book Permafrost Response on Economic Development, Environmental Security and Natural Resources written by R. Paepe and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlike connotations such as greenhouse effect. global change, sea level, desertification, etc. , permafrost is definitely lacking in the everyday speech of many non-specialists. The reason is that areas of permafrost are too remote, barren and isolated. Focus on permafrost today is brought when huge environmental disasters, mainly related to pollution by oil spills, occur. Even then it is offered as
