| 释义 |
gabbroid, a. Petrol.|ˈgæbrɔɪd|
[f. gabbro + -oid.]
Resembling gabbro; spec. belonging to the petrographic clan containing the gabbro and dolerite families, the rocks of which contain a high proportion of ferromagnesian minerals. Also as n. Hence gaˈbbroidal a.
1900Amer. Geologist XXVI. 151 (heading) Mineralogical and petrographic study of the gabbroid rocks of Minnesota, and more particularly of the plagioclasytes. 1904Chamberlin & Salisbury Geol. (1905) I. 432 The term gabbroids may be used to include the dark crystalline rocks in which the ferromagnesian minerals predominate, as the diorites, gabbros, dolerites, peridotites, etc. Ibid., The granitoids are usually acidic and the gabbroids usually basic. 1931Mineral. Abstr. IV. 401 Chemical analyses of the differentiation products of a gabbroidal magma, viz. diorite-pegmatite, diorite-aplite [etc.]. 1940Geogr. Jrnl. XCV. 394 The association of gabbroid and granophyric rocks. 1965G. J. Williams Econ. Geol. N.Z. x. 160/2 These lenses..were invaded by gabbroidal and peridotitic dykes conformably with the bedding planes. |