The east–west length of the field is over 200 mile (320 km), while the width reaches up to 80 miles (130 km) in the central Wrangell Mountains. The field includes numerous shield volcanoes, stratovolcanoes, caldera complexes, cinder cones, and extensive lava flows, which have erupted throughout the past 26 million years. All of the higher peaks are less than 5 million years old, since the rate of glacial erosion is very high in this region of extreme snowfall and cold temperatures. Higher elevations of the field above 5,000 ft (1,500 m) are almost entirely covered in glaciers and icefields, especially on the windward southern side of the ranges.
The volcanoes of the western Wrangell Mountains are less than 5 million years old with the youngest lava flows are probably as young as 50,000 years ago. The Canadian portion of the field is dominated by scattered remnants of upper Cenozoic subaerial lavas and pyroclastic rocks. Over large areas extrusive rocks lie in flat undisturbed piles on a Cenozoic surface of moderate relief. Locally, however, strata of the same age have been affected by a late pulse of tectonism, during which they were faulted, contorted into tight symmetrical folds, or overridden by pre-Cenozoic baserocks along southwesterly dipping thrust faults. Considerable recent uplift, accompanied by rapid erosion, has reduced once vast areas of upper Cenozoic volcanic rocks to small isolated remnants. Although no centers younger than late Miocene are known in Canada, the eruption of rhyolitepumice, White River Ash, from Mount Churchill near the head of Klutlan Glacier blanketed large areas of northwestern Canada with tephra some 2,000 years ago.
Most of volcanoes of the Western Wrangell Mountains are not like the other volcanoes located around the Pacific Rim. Rather than erupting explosive lavas forming stratovolcanoes, they have been built by the buildup of hundreds of comparatively fluid lava flows to form shield volcanoes. Only the young Mount Wrangell still shows its shield-like form; the other, commonly older volcanoes have had much of their original form removed by glacial and other erosional processes, such as Rabbit Mountain and Felsite Peak, which are now eroded to form an outcrop.
Major volcanoes of the Wrangell Volcanic Field include:
Mount Bona, 16,421 ft (5,005 m), Saint Elias Mountains
^Miller, Thomas P.; Richter, Donald H., "Quaternary volcanism in the Alaska Peninsula and Wrangell Mountains, Alaska", The Geology of Alaska, Boulder, Colorado: Geological Society of America, pp. 759–779, doi:10.1130/dnag-gna-g1.759, retrieved 2023-12-17
^Yang, Xiaotao; Gao, Haiying (November 2020). "Segmentation of the Aleutian‐Alaska Subduction Zone Revealed by Full‐Wave Ambient Noise Tomography: Implications for the Along‐Strike Variation of Volcanism". Journal of Geophysical Research: Solid Earth. 125 (11). doi:10.1029/2020JB019677. ISSN 2169-9313.
Miller, Thomas P.; Richter, Donald H., "Quaternary volcanism in the Alaska Peninsula and Wrangell Mountains, Alaska", The Geology of Alaska, Boulder, Colorado: Geological Society of America, pp. 759–779, doi:10.1130/dnag-gna-g1.759, retrieved 2023-12-17
Yang, X., & Gao, H. (2020). Segmentation of the Aleutian-Alaska subduction zone revealed by full-wave ambient noise tomography: Implications for the along-strike variation of volcanism. Journal of Geophysical Research: Solid Earth, 125, e2020JB019677. https://doi.org/10.1029/2020JB019677
Richter, Donald H.; Danny S. Rosenkrans; Margaret J. Steigerwald (1995). Guide to the Volcanoes of the Western Wrangell Mountains, Alaska. USGS Bulletin 2072.
Winkler, Gary R. (2000). A Geologic Guide to Wrangell—Saint Elias National Park and Preserve, Alaska: A Tectonic Collage of Northbound Terranes. USGS Professional Paper 1616. ISBN0-607-92676-7.
Richter, Donald H.; Cindi C. Preller; Keith A. Labay; Nora B. Shew (2006). Geologic Map of the Wrangell-Saint Elias National Park and Preserve, Alaska. USGS Scientific Investigations Map 2877.
wrangell, volcanic, field, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, . This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Wrangell Volcanic Field news newspapers books scholar JSTOR June 2009 Learn how and when to remove this message The Wrangell Volcanic Field is a volcanic field stretching from eastern Alaska in the United States to the southwestern Yukon Territory in Canada The field includes the four highest volcanoes in the United States Mount Bona Mount Blackburn Mount Sanford and Mount Churchill all of which exceed 15 000 ft 4 600 m in elevation It formed as a result of subduction of the Pacific Plate beneath the North American Plate at the easternmost end of the Aleutian Trench 1 2 3 Mount Blackburn The bulk of the Wrangell Volcanic Field lies within the Wrangell Mountains of Alaska but the field also extends eastwards into the neighboring Saint Elias Mountains and the Yukon Territory The east west length of the field is over 200 mile 320 km while the width reaches up to 80 miles 130 km in the central Wrangell Mountains The field includes numerous shield volcanoes stratovolcanoes caldera complexes cinder cones and extensive lava flows which have erupted throughout the past 26 million years All of the higher peaks are less than 5 million years old since the rate of glacial erosion is very high in this region of extreme snowfall and cold temperatures Higher elevations of the field above 5 000 ft 1 500 m are almost entirely covered in glaciers and icefields especially on the windward southern side of the ranges Mount Sanford left and Mount Wrangell Mount Wrangell The field is named for Mount Wrangell a massive shield volcano which has been active historically The stratovolcano of Mount Churchill has had the largest recent eruptions with two large magnitude explosive eruptions in the last 2 000 years that blanketed most of the Yukon with volcanic ash the White River Ash The volcanoes of the western Wrangell Mountains are less than 5 million years old with the youngest lava flows are probably as young as 50 000 years ago The Canadian portion of the field is dominated by scattered remnants of upper Cenozoic subaerial lavas and pyroclastic rocks Over large areas extrusive rocks lie in flat undisturbed piles on a Cenozoic surface of moderate relief Locally however strata of the same age have been affected by a late pulse of tectonism during which they were faulted contorted into tight symmetrical folds or overridden by pre Cenozoic baserocks along southwesterly dipping thrust faults Considerable recent uplift accompanied by rapid erosion has reduced once vast areas of upper Cenozoic volcanic rocks to small isolated remnants Although no centers younger than late Miocene are known in Canada the eruption of rhyolite pumice White River Ash from Mount Churchill near the head of Klutlan Glacier blanketed large areas of northwestern Canada with tephra some 2 000 years ago Most of volcanoes of the Western Wrangell Mountains are not like the other volcanoes located around the Pacific Rim Rather than erupting explosive lavas forming stratovolcanoes they have been built by the buildup of hundreds of comparatively fluid lava flows to form shield volcanoes Only the young Mount Wrangell still shows its shield like form the other commonly older volcanoes have had much of their original form removed by glacial and other erosional processes such as Rabbit Mountain and Felsite Peak which are now eroded to form an outcrop Major volcanoes of the Wrangell Volcanic Field include Mount Bona 16 421 ft 5 005 m Saint Elias Mountains Mount Blackburn 16 390 ft 4 996 m Wrangell Mountains Mount Sanford 16 237 ft 4 949 m Wrangell Mountains Mount Churchill 15 638 ft 4 766 m Saint Elias Mountains Mount Wrangell 14 163 ft 4 317 m Wrangell Mountains Atna Peaks 13 860 ft 4 225 m Wrangell Mountains Regal Mountain 13 845 ft 4 220 m Wrangell Mountains Mount Jarvis 13 421 ft 4 091 m Wrangell Mountains Mount Drum 12 010 ft 3 661 m Wrangell Mountains Volcanoes of the Canadian portion of the Wrangell Volcanic Field include Felsite Peak 8 301 ft 2 530 m Coast Mountains Rabbit Mountain 6 857 ft 2 090 m Nutzotin MountainsSee also editList of volcanoes in the United States of America List of volcanoes in Canada Volcanism in CanadaReferences edit Miller Thomas P Richter Donald H Quaternary volcanism in the Alaska Peninsula and Wrangell Mountains Alaska The Geology of Alaska Boulder Colorado Geological Society of America pp 759 779 doi 10 1130 dnag gna g1 759 retrieved 2023 12 17 Yang Xiaotao Gao Haiying November 2020 Segmentation of the Aleutian Alaska Subduction Zone Revealed by Full Wave Ambient Noise Tomography Implications for the Along Strike Variation of Volcanism Journal of Geophysical Research Solid Earth 125 11 doi 10 1029 2020JB019677 ISSN 2169 9313 Miller Thomas P Richter Donald H Quaternary volcanism in the Alaska Peninsula and Wrangell Mountains Alaska The Geology of Alaska Boulder Colorado Geological Society of America pp 759 779 doi 10 1130 dnag gna g1 759 retrieved 2023 12 17 Yang X amp Gao H 2020 Segmentation of the Aleutian Alaska subduction zone revealed by full wave ambient noise tomography Implications for the along strike variation of volcanism Journal of Geophysical Research Solid Earth 125 e2020JB019677 https doi org 10 1029 2020JB019677 Richter Donald H Danny S Rosenkrans Margaret J Steigerwald 1995 Guide to the Volcanoes of the Western Wrangell Mountains Alaska USGS Bulletin 2072 Winkler Gary R 2000 A Geologic Guide to Wrangell Saint Elias National Park and Preserve Alaska A Tectonic Collage of Northbound Terranes USGS Professional Paper 1616 ISBN 0 607 92676 7 Richter Donald H Cindi C Preller Keith A Labay Nora B Shew 2006 Geologic Map of the Wrangell Saint Elias National Park and Preserve Alaska USGS Scientific Investigations Map 2877 Wood Charles A Kienle Jurgen eds 1990 Volcanoes of North America Cambridge University Press ISBN 0 521 43811 X External links edit nbsp Wikimedia Commons has media related to Wrangell volcanic field Alaska Volcano Observatory Wrangell Volcanic Field National Resources Canada Catalogue of Canadian volcanoes 62 01 38 N 143 37 18 W 62 0272 N 143 6217 W 62 0272 143 6217 Retrieved from https en wikipedia org w index php title Wrangell Volcanic Field amp oldid 1223945991, wikipedia, wiki, book, books, library,
