| 释义 |
▪ I. ˈupthrust, n.
[up- 2.]
1. a. The action of thrusting or fact of being thrust upwards, esp. by volcanic action.
1846Mem. Geol. Surv. Gt. Britain I. 228 The upthrust of the Cornish and Devonian granites. 1862G. P. Scrope Volcanos 129 Serpentine and even granite may be..in course of formation and upthrust..at the present day. 1895Pop. Sci. Monthly Mar. 580 A crater of this sort is formed by the upthrust of the masses of lava.
b. The upward force that a liquid exerts on a body in it.
1916Allen & Moore Text-bk. Pract. Physics 54 The resultant supporting force may be termed the upthrust. 1982J. J. Wellington Physics for All vii. 46 A heavy ship needs a very large upthrust on it to make it float.
2. An upthrust body of rock or the accompanying fault.
1942M. P. Billings Structural Geol. viii. 154 Upthrusts are high angle faults along which the relatively uplifted block has been the active element. 1977G. Scott Hot Pursuit viii. 75 Mountains run the whole length of the North Island of New Zealand, great upthrusts of grey⁓wacke and jointed sandstone. 1982T. Hillerman Dark Wind (1983) viii. 46 The plane..had struck an upthrust of basalt which jutted from the floor of the wash.
▪ II. upˈthrust, pa. pple. and ppl. a.
(up- 5.)
1845Browning Time's Revenges 36 Some creature..to be down-torn, Upthrust and outward-borne. 1873Longfellow Wayside Inn iii. Poet's T., Interl. 40 Then flash of brazen armour bright,..and spears up-thrust. 1890Q. Jrnl. Geol. Soc. May 216 An upthrust portion of the old crystalline floor. |