| 释义 |
peperite Geol.|ˈpɛpəraɪt|
[ad. F. pépérite (P. L. A. Cordier Mémoire sur les Substances minérales dites ‘en Masse’ (1815) ix. 66), prob. f. pépér(ine peperino + -ite -ite1.]
A brecciated volcanic material consisting of fragments of lava and sedimentary rock, regarded by some as formed by the intrusion of lava into wet sediment, freq. under water, and by others as a product of the mixing of volcanic ejectamenta with such sediments. Cf. peperino.
1839Civil Engin. & Arch. Jrnl. II. 195/1 The geological structure of Mr. Hamilton's line of route is simple, being composed of only schistose rocks,..tertiary sandstones and limestones, granite, peperite, trachyte, basalt, and other igneous rocks. 1903A. Geikie Text-bk. Geol. (ed. 4) II. 1254 These intercalations of tuff from the ‘Peperites’ of Auvergne, regarding which so much difference of opinion has been expressed. 1953Prof. Papers U.S. Geol. Survey No. 454-b. 4/2 On Unalaska, pillows are separated from each other by peperite, fragmental igneous rock, argillite, or crustified chalcedony and quartz... Peperite is a mottled light-gray to pale-green breccia of mixed sedimentary and primary igneous debris. 1969Proc. Geologists' Assoc. LXXX. 177 It is concluded that the peperites [of the Auvergne] are the product of explosive projection of basaltic ejectamenta into steadily accumulating lime-mud. |