| 释义 |
trondhjemite Petrogr.|ˈtrɒndheɪmaɪt|
[ad. G. trondhjemit (V. M. Goldschmidt 1916, in Skrifter udgivna af Vidensk. i Christiania (Matem.-Naturv. Klasse) No. 2. 77), f. Trondhjem (now Trondheim), name of a city in western Norway: see -ite1.]
Any leucocratic tonalite, esp. one in which the plagioclase is oligoclase.
1922Jrnl. Geol. XXX. 406 The acid phase is represented by ‘trondhjemite’ (new name) which Kjerulf calls an oligoclase-granite, and which might as well be characterized as a granodiorite. 1978Nature 12 Oct. 538/2 The metabasaltic sequences may be of considerable thickness and in many areas are associated with intrusive cumulate gabbros, trondhjemites and minor developments of serpentinised peridotites. 1979F. Barker Trondhjemites, Dacites, & Related Rocks i. 1 The author suggests that the IUGS definition of trondhjemite as leucotonalite be followed, except that andesine-bearing leucotonalite be termed calcic trondhjemite, and that albite-bearing leucotonalite, as well as the oligoclase variety, be termed trondhjemite. |