| 单词 | mantle plume |
| 释义 | > as lemmasmantle plume Categories » mantle plume n. Geology see plume n. 7c. mantle plume c. Geology. More fully mantle plume. A column of magma rising by convection from the lower mantle and spreading sideways on reaching the base of the lithosphere, postulated to cause motion of the lithospheric plates and the occurrence of volcanism away from plate margins. ΘΚΠ the world > the earth > structure of the earth > formation of features > tectonization or diastrophism > [noun] > upwelling of magma magmatism1952 sea-floor spreading1961 pulse1964 ocean-floor spreading1965 plume1967 1967 D. L. Turcotte & E. R. Oxburgh in Jrnl. Fluid Mech. 28 i. 32 When the two hot boundary layers from adjacent cells meet they separate from the horizontal plane and form a plume which rises to the upper surface. 1971 W. J. Morgan in Nature 5 Mar. 42/2 In my model there are about twenty deep mantle plumes bringing heat and relatively primordial material up to the asthenosphere and horizontal currents in the asthenosphere flow radially away from each of these plumes. 1976 P. Francis Volcanoes i. 49 The plume effectively burns a hole through the overlying crustal plate..and a volcano results. 1992 N.Y. Times 15 Dec. c13/5 As plumes approach the crust and the Earth's surface, they mushroom outward, melting surrounding rock, gathering it up and pulling it to the surface. 2003 Sci. Amer. Apr. 47/1 The early volcanism at Etna was apparently fueled by a mantle plume. < as lemmas |
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