Tuff Breccia

a volcanogenic sedimentary rock consisting of angular or, less frequently, slightly rounded fragments of extrusive rocks that range in size from blocks of several cubic meters to particles the size of grains of sand and are cemented together by fine volcanic ash. Tuff breccia occurs in thick layers in volcanogenic formations. The origin of tuff breccia is not always clear. In many cases, tuff breccia is deposited by lahars, which are thick mudflows that accompany volcanic eruptions. (See alsoVOLCANOGENIC SEDIMENTARY ROCK.)

单词	tuff breccia
释义	Tuff Breccia Tuff Breccia a volcanogenic sedimentary rock consisting of angular or, less frequently, slightly rounded fragments of extrusive rocks that range in size from blocks of several cubic meters to particles the size of grains of sand and are cemented together by fine volcanic ash. Tuff breccia occurs in thick layers in volcanogenic formations. The origin of tuff breccia is not always clear. In many cases, tuff breccia is deposited by lahars, which are thick mudflows that accompany volcanic eruptions. (See alsoVOLCANOGENIC SEDIMENTARY ROCK.)
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