| 单词 | petrographic province |
| 释义 | > as lemmaspetrographic province b. Geology. In full petrographic province, petrographical province. An area containing a group of igneous rocks that appear to have been formed during the same period of igneous activity, and presumably from the same magma. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > area province1886 1886 J. W. Judd in Q. Jrnl. Geol. Soc. 42 54 There are distinct petrographical provinces, within which the rocks erupted during any particular geological period present certain well-marked peculiarities in mineralogical composition and microscopical structure, serving at once to distinguish them from the rocks belonging to the same general group, which were simultaneously erupted in other petrographical provinces. 1886 F. Rutley in Q. Jrnl. Geol. Soc. 42 96 Lavas of totally distinct characters are poured out from the same vent, so that the use of the term ‘petrographic province’ seemed to be of rather doubtful propriety. 1910 P. Lake & R. H. Rastall Text-bk. Geol. xiii. 230 The occurrence of chemical peculiarities running through all or nearly all the igneous rocks of a province shows that they are not all brought together by chance, but that there must be some real relationship between the different types. 1941 Amer. Jrnl. Sci. 239 542 (heading) Compositions..of the salic portions of residual magmas in New Zealand petrographical provinces. 1993 Sci. Amer. Oct. 27/2 The most fundamental observation about these provinces is that they consist of basalt, a common, iron-and magnesium-rich rock. < as lemmas |
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