| 释义 |
granodiorite Petrogr.|ˌgrænəʊˈdaɪəraɪt|
[f. grano-, taken as combining form of granite (cf. granophyre) + diorite.]
Any of the plutonic igneous rocks intermediate in composition between true granite and quartz-diorite, which are similar in appearance to granite but are usu. darker in colour; esp. one in which there is at least twice as much plagioclase as alkali feldspar.
1893W. Lindgren in Amer. Jrnl. Sci. 3rd Ser. XLVI. 203 On the Survey maps of the Gold Belt of the Sierra Nevada, of which district Mr G. F. Becker is geologist in charge, it has therefore been determined to indicate this rock as granodiorite, which term it is hoped will find general acceptance. 1932A. Johannsen Descr. Petrogr. II. 323 Granodiorites occur as intrusive bodies, in the same manner as granites, and often form huge masses. 1961Bull. Board Celtic Stud. XIX. 167 A magnificent implement [sc. a Neolithic axe-head] made of an augite granodiorite, almost certainly of Pembrokeshire origin. 1965G. J. Williams Econ. Geol. N.Z. xiv. 216/1 The central granite consists of types ranging from pink, generally porphyritic, alkali granites to the more common white to grey biotite calc-alkali granite, adamellite or granodiorite. |