File:Mount Hood Volcano (Cascade Range, Oregon, USA) 11.jpg
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[edit]DescriptionMount Hood Volcano (Cascade Range, Oregon, USA) 11.jpg |
English: Mt. Hood is a subduction zone stratovolcano in northwestern Oregon. It is part of the north-south trending Cascade Range of volcanoes from northern California to southwestern British Columbia. Other famous Cascade volcanoes include Mt. St. Helens, Mt. Rainier, Mt. Shasta, and Mt. Mazama (now Crater Lake Caldera).
Mt. Hood area volcanism started in the Middle Miocene, 8 to 10 million years ago, just after Columbia River Flood Basalt volcanism. Miocene and Pliocene andesites and basalts cap topographic ridges in the Mt. Hood area. During the Late Pliocene (sensu traditio), at 3 to 1.3 million years ago, the Sandy Glacier Volcano occupied the site of the current Mt. Hood. Sandy Glacier Volcano is now mostly buried by the modern Mt. Hood volcanic cone. Mt. Hood itself is less than 730,000 years old - all of its rocks have modern magnetic signatures. Lavas and other eruptive materials are high-silica andesites and low-silica dacites. 70% of the Mt. Hood cone consists of lava flows, while the remaining 30% is volcaniclcastic deposits. The modern cone is less than 300,000 years old. Near the summit of Mt. Hood are lava flows dating to younger than 200,000 years old. Unlike nearby Mt. St. Helens, Mt. Hood is much older and has had little explosive activity. Most of Mt. Hood's volcanism has consisted of andesite lava flows and dome-building. Few explosive events have occurred through time here - few tephra deposits have a Mt. Hood source. Mt. Hood rocks are often porphyritic two-pyroxene andesites, plus a little olivine. There's been little chemical variation in Mt. Hood lavas through time. Because of this, individual lava flows are difficult to date based on lithology - they're all the same. Much of Mt. Hood itself consists of hydrothermally-altered rocks. Names are assigned to the various eruptive phases in Mt. Hood's history. The Polallie eruptive phase occurred from 12 to 25 thousand years ago. The Timberline eruptive phase occurred ~1500 years ago. The Old Maid eruptive phase occurred over 200 years ago, often dated to 1780-1801 A.D. Dome building occurred from 1781 to 1793. During that time, periodic, relatively small eruptions occurred. Because Mt. Hood is a snow-clad volcano, activity results in melting of snow and mobilization of loose materials. Rainstorms could also mobilize loose debris in the area. Mt. Hood lahars have probably formed by both mechanisms. Locality: Mt. Hood Volcano (looking east from the Jonsrud Viewpoint in the town of Sandy), northwestern Oregon, USA Info. at: www.usgs.gov/volcanoes/mount-hood |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/53225915166/ |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/53225915166. It was reviewed on 11 October 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
11 October 2023
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current | 15:42, 11 October 2023 | ![]() | 3,008 × 2,000 (3.64 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53225915166/ with UploadWizard |
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Camera manufacturer | NIKON CORPORATION |
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ISO speed rating | 400 |
Date and time of data generation | 11:19, 21 October 2009 |
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Horizontal resolution | 300 dpi |
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File change date and time | 07:59, 1 October 2023 |
Y and C positioning | Co-sited |
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Exif version | 2.21 |
Date and time of digitizing | 11:19, 21 October 2009 |
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Focal length in 35 mm film | 52 mm |
Scene capture type | Standard |
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Date metadata was last modified | 03:59, 1 October 2023 |
Unique ID of original document | 73F95CC740799B8345CCC00455263648 |