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lithic tuff

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lithic tuff [′lith·ik ′təf]
(geology)
A tuff that is mostly crystalline rock fragments.
An indurated volcanic ash deposit whose fragments are composed of previously formed rocks that first solidified in the volcanic vent and were then blown out.


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The ridge is cored by a dacitic complex composed of non-welded to welded crystal tuffs and lithic tuffs intercalated with silicified epiclastics, generally mudstones.
The bulk of historical drilling was concentrated along a mineralized lithic tuff volcanic and black sediment/mudstone contact.
Mineralization at Alexandra is hosted in Toodoggone crystal lithic tuffs.
 
 
 
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