noun, plural gab·bros. Petrology.
Origin of gabbro
Related formsgab·bro·ic [guh-broh-ik] /gəˈbroʊ ɪk/, gab·bro·it·ic, adjectivegab·broid [gab-roid] /ˈgæb rɔɪd/, adjective
Examples from the Web for gabbro
Still more common is the occurrence of sheared, foliated or schistose forms of gabbro.
Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt.
The gneisses appear to be due in many cases to the crushing and shearing of deep-seated igneous rocks, such as granite and gabbro.The Elements of Geology|William Harmon Norton
These are caused either by old intrusions of diabase and gabbro which have undergone modifications, or by later ones of dolerite.
Lithologically they are crystalline schists, together with granite, diorite, gabbro and other igneous rocks.