| 释义 |
syenodiorite Petrogr.|saɪənəʊˈdaɪəraɪt|
[f. syeno-, comb. form of syenite + diorite.]
A plutonic rock of a kind intermediate between syenite and diorite, containing both alkali feldspar and plagioclase.
1917A. Johannsen in Jrnl. Geol. XXV. 89 Syenodiorite, syenogabbro, and granogabbro are introduced as new terms. 1940Bull. Geol. Soc. Amer. LI. 1592 The laccolith near the abandoned wax factory on Fresno Creek..is composed of a striking augite syenodiorite. 1977A. Hallam Planet Earth 162/1 Color index rises to about 50 in the gabbros and is between 20 and 50 in the diorites and syenodiorites. |