单词 | neovolcanic |
释义 | neovolcanicadj. Geology. Of, relating to, or designating volcanic rocks and phenomena dating from the Tertiary period (up to about 65 million years ago) to the present time (contrasted with palaeovolcanic). Now often: spec. designating or relating to zones of recent volcanic activity. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [adjective] > volcanic > other volcanics Uriconian1886 neovolcanic1887 metavolcanic1956 1887 Amer. Naturalist 21 177 The pretertiary effusive rocks are known as palæo-volcanic, the younger ones as neo-volcanic. 1903 A. Geikie Text-bk. Geol. (ed. 4) I. ii. 1 vii. ii. 98 The older or palæo-volcanic are separated from the younger or neo-volcanic effusive rocks. 1968 Science 28 June 1437/1 Iceland is..divided by a Quaternary neovolcanic zone which separates the Tertiary plateau basalt province into a western and an eastern portion. In this zone there have been many eruptions in historical times. 1989 Nature 18 May 207/1 The behaviour is consistent with the hypothesis that the upper crust fractures as it spreads away from the neovolcanic zone. 2001 Earth & Planetary Sci. Lett. 190 31 At fast and superfast spreading mid-ocean ridges..a plate boundary is defined by a narrow (tens to hundreds of meters wide) neovolcanic zone within which the bulk of the upper oceanic crust is created. This is a new entry (OED Third Edition, September 2003; most recently modified version published online March 2022). < adj.1887 |
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