| 单词 |
tuffite |
| 释义 |
tuffite, n. Geol.|ˈtʌfaɪt|
[ad. G. Tuffit (O. Mügge 1893, in Neues Jahrb. f. Min. VIII. 708): see tuff n., -ite1.]
Any composite rock which consists of a mixture of pyroclastic and sedimentary material, esp. one in which pyroclasts predominate.
1925Mineral 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. 1932Bull. 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. 1973Nature 1 June 281/1 Tuffs, tuffites and sediments are intercalated. 1987Neues Jahrb. f. Min.: Abhandl. CLV. 203 The age of the tuffites studied ranges from Upper Tortonian to Lower-Middle Pliocene, and their chemical composition is constantly rhyolitic. |
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