File:Basaltic lapilli (Ascension Island, Atlantic Ocean).jpg
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| Description |
English: Weathered basaltic lapilli from Ascension Island in the Atlantic Ocean. (the long axis of the specimen at upper right is ~30 millimeters long)
Volcanic eruptions produce a variety of igneous products that vary in size, shape, and composition. Terms based on clast size include volcanic dust (less than 1/8 of a millimeter), volcanic ash (1/8 to 2 millimeters), lapilli (2 to 64 millimeters), blocks (angular tephra larger than 64 millimeters in size), and bombs (non-angular tephra larger than 64 millimeters in size). Seen here are lapilli from a volcanic deposit on Ascension Island in the Atlantic Ocean. The island is a hotspot - a site of volcanic activity atop a large mantle plume. Other examples of hotspots include Iceland, Afar, Yellowstone, and Hawaii. Like volcanic bombs, lapilli vary in shape. These are almond-shaped, with variably developed keels along their circumference. They are composed of vesiculated basalt. Age: likely Holocene Locality: unrecorded site on Ascension Island (Ascension Hotspot), west of the Mid-Atlantic Ridge, equatorial South Atlantic Ocean. |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/53205903321/ |
| 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@N05/53205903321. 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. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 15:48, 11 October 2023 | | 2,588 × 2,077 (3.43 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53205903321/ with UploadWizard |
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