tuffiten.
/ˈtʌfʌɪt/ Geology.
Any composite rock which consists of a mixture of pyroclastic and sedimentary material, esp. one in which pyroclasts predominate.
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the world > the earth > structure of the earth > constituent materials > rock > composite rock > [noun] > fragmentary
pyroclastic1896
tuffite1925
volcaniclastics1970
1925 Mineral Abstr. II. 397 Around Borzhom in Georgia, the dislocated Eocene sediments (calcareous sandstones, sandstones, and tuffites) are intruded by dikes and sills of diabase and diabase-porphyrite, and partly covered by andesitic flows.
1932 Bull. Nat. Res. Council (U.S.) lxxxix. ii. 42 Rocks composed of a mixture of pyroclastic and sedimentary material, especially ash and sediment, were defined by Mügge as tuffite, while metamorphosed tuffs were referred to as tuffoide. Tuffite, as far as the writers are aware, has never been adopted outside Germany, and tuffoide has already been shown to be illegitimate on grounds of priority.
1973 Nature 1 June 281/1 Tuffs, tuffites and sediments are intercalated.
1987 Neues Jahrb. f. Min.: Abhandl. 155 203 The age of the tuffites studied ranges from Upper Tortonian to Lower-Middle Pliocene, and their chemical composition is constantly rhyolitic.
This entry has not yet been fully updated (first published 1993; most recently modified version published online June 2018).
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