| 单词 | to pinch down |
| 释义 | > as lemmasto pinch down c. intransitive. Mining and Geology. Of a vein or deposit of ore, or a stratum: to contract in volume, to become gradually thinner; to pinch out: to become thinner to the point of extinction, to run out; also (rare) to pinch down, to pinch up. Cf. lens v. ΘΚΠ the world > the earth > structure of the earth > structural features > sedimentary formation > [verb (intransitive)] > narrow to wedge out1819 pinch1867 to lens out1921 the world > the earth > minerals > mineral deposits > features of stratum or vein > [verb (intransitive)] > contract twitch1704 pinch1867 1867 J. A. Phillips Mining & Metall. Gold & Silver iv. 56 The lode, which is eight feet wide on the north side of the Eureka, pinches out very rapidly in that direction. 1869 A. K. McClure 3,000 Miles through Rocky Mts. 267 They know that it [sc. the lead] may cap, or pinch, or play out entirely. 1872 R. W. Raymond Statistics Mines & Mining 307 The vein is 5 or 6 feet wide, on an average, but expanding sometimes to 15 or 20 feet, and pinching up in places to a few inches. 1891 M. Cole Cy Ross 93 The vein began suddenly to pinch last week..the vein is steadily pinching narrower and narrower as we advance. 1916 F. H. Lahee Field Geol. ix. 240 Sometimes strata are irregularly thinned and thickened so that they ‘pinch and swell’, as seen in cross section. 1928 W. A. Chalfant Outposts Civilization 82 High-grade veins were followed as they pinched down, even to half inch seams. 1945 Bull. Amer. Assoc. Petroleum Geologists 29 1563 The reservoir bed must pinch out in all updip directions. 1961 Jrnl. Geol. (Chicago) 69 339/1 The layered marine sediments pinch out to the south. 1993 Jrnl. Petrol. 34 292 Some cyclic units thicken, thin, and even pinch out laterally. < as lemmas |
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