File:Andesite_(1997_lava_from_Soufriere_Hills_Volcano,_Montserrat,_Lesser_Antilles_Volcanic_Arc,_eastern_Caribbean_Sea)_1.jpg
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Summary
DescriptionAndesite (1997 lava from Soufriere Hills Volcano, Montserrat, Lesser Antilles Volcanic Arc, eastern Caribbean Sea) 1.jpg |
English: Soufrière Hills andesite lava (9.6 cm across at its widest) - this lava sample consists two lithologies, sharply demarcated and defined by a slight color change, a phenocryst abundance/size change, and a vesiculation difference. The left portion of the sample is light gray, semi-vesicular porphyritic andesite. The right portion of the sample is a very light gray, semi-pumiceous porphyritic andesite. Available petrologic information indicates that 1997 Soufrière Hills andesite is a quartz-bearing, two-pyroxene, porphyritic hornblende andesite. Dominant phenocrysts include hornblende amphibole, hypersthene pyroxene, and plagioclase feldspar. Minor phenocrysts include titanomagnetite, quartz, and augite pyroxene microphenocrysts. The groundmass material is a mix of finely-crystalline plagioclase feldspar, orthopyroxene, augite clinopyroxene, pigeonite, titanomagnetite, and quartz, plus rhyolitic glass.
Locality: summit of Soufrière Hills Volcano, southern Montserrat, northern West Indies, eastern Caribbean Sea. Collected in June 1998. A significant series of volcanic eruptions decimated the southern half of Montserrat during the 1990s. Montserrat is an island in the northern Lesser Antilles Volcanic Arc (eastern Caribbean Sea). The islands of the Lesser Antilles have a volcanic origin, the result of the North American Plate subducting westward & downward beneath the Caribbean Plate. The Soufrière Hills Volcano occupies much of the southern half of Montserrat. It is a 31,000+ year old, andesitic, subduction zone stratovolcano. Its current phase of activity began in 1995 and 1996, prompting the evacuation of most of the island’s southern half. A significant ash eruption in summer 1997 destroyed the capital city of Plymouth along the southwestern shore of the island. The eruption was apparently triggered by the injection of basaltic magma into one of the volcano's two magma chambers. Soufrière Hills has been erupting intermittently to the present day (including activity in the 2010s), and the southern part of Montserrat has been off-limits to residents. Many former Plymouth residents have emigrated to Britain. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/14839780968/ |
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@N05/14839780968. It was reviewed on 19 June 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
19 June 2022
Items portrayed in this file
depicts
13 February 2007
image/jpeg
f0bcfece86ece0e168ab05c4e41595ed191807ef
2,322,264 byte
1,918 pixel
2,383 pixel
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 08:32, 19 June 2022 | 2,383 × 1,918 (2.21 MB) | Ser Amantio di Nicolao | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/14839780968/ with UploadWizard |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 21:40, 24 August 2014 |
Color space | Uncalibrated |
Image width | 2,383 px |
Image height | 1,918 px |
Date and time of digitizing | 06:33, 13 February 2007 |
Date metadata was last modified | 17:40, 24 August 2014 |
IIM version | 2 |