| 单词 |
intrusive |
| 释义 |
intrusive, a. and n.|ɪnˈtruːsɪv|
[f. L. intrūs-, ppl. stem of intrūdĕre to intrude + -ive.]
A. adj.
1. Of intruding character; characterized by coming or entering in an encroaching manner, or without invitation or welcome; done or carried out with intrusion.
1647M. Hudson Div. Right Govt. ii. iv. 98 Every Polarchical action in the Polarchs..being rebellious and intrusive. 1735Thomson Liberty i. 299 No mighty moles the big intrusive storm, From the calm stations roll resounding back. 1813Scott Rokeby i. xxx, Still he turned impatient ear From Truth's intrusive voice severe. 1891E. Peacock N. Brendon I. 175 He was not shy, but did not wish to be intrusive.
2. a. That has been intruded or thrust in.
1862Marsh Eng. Lang. ii. 34 An intrusive element in a language is confined to the vocabulary and minor grammatical forms. 1897Allbutt's Syst. Med. IV. 476 Large quantities of this intrusive substance strangling the secreting textures. 1900I. Taylor in N. & Q. 9th Ser. V. 483/1 The n in Pentland Firth is intrusive, while the Pentland Hills were Penland, the t being intrusive and the n radical.
b. Geol. Of an igneous rock: Forced, while in a state of fusion, into cavities or fissures of other rocks.
1844Darwin Geol. Obs. (1876) ii. 513 The number and bulk of the intrusive masses of different coloured porphyries..is truly extraordinary. 1858Geikie Hist. Boulder xii. 241 The intrusive traps occur in the form of walls and veins. 1876Page Adv. Text-bk. Geol. iv. 85 When igneous matter appears to have thrust itself between certain strata in wedge-shaped or sheet-like masses, it is spoken of as intrusive.
3. Inward-thrusting. rare.
1847R. Willis tr. Harvey's Wks. 383 (Generat. Animals lii.), I straightway perceived a certain protuberant fleshy part, affected with an alternating extrusive and intrusive movement.
B. n. Geol. An intrusive rock or rock mass.
1895A. Harker Petrol. vii. 87 Acid intrusives. The acid intrusive rocks embrace a considerable range of varieties. 1925N. E. Odell in E. F. Norton Fight for Everest, 1924 300 Yet the character of the former [sc. the limestone series] may be entirely due to its proximity to the hard crystalline rocks and its alteration brought about by pressure against them, if not also by their igneous intrusives. 1962W. T. Huang Petrol. iii. 51 It [sc. magma] may be solidified at great depth, forming such large intrusives as batholiths, stocks, and lopoliths. 1968J. Gilluly et al. Princ. Geol. (ed. 3) xviii. 435 (caption) Devil's Tower, Wyoming, probably a volcanic plug, but perhaps part of a roofed intrusive. |
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