Welded tuff/volcanic breccia |
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Volcanic breccia or welded tuffThis is an example of a welded tuff. Angular chunks of ryholitic lava are "glued" together by a darker mafic lava. This is probably a debris fall from a massive volcanic explosive eruption. The lava that glued the fragments together was still molten at the time that the rock formed.This sample came from a Colorado River terrace gravel deposit near Lake Havasu City, Arizona. |
| https://gotbooks.miracosta.edu/rocks/igneous/29.html | 2/2/2021 |