syenodioriten.
/sʌɪənəʊˈdʌɪərʌɪt/ Geology.
A plutonic rock of a kind intermediate between syenite and diorite, containing both alkali feldspar and plagioclase.
ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > plutonic rocks > other plutonics
dunite1859
napoleonite1866
corsite1876
tonalite1879
trout-stone1892
granodiorite1893
adamellite1896
syenodiorite1917
microdiorite1920
trondhjemite1922
1917 A. Johannsen in Jrnl. Geol. (Chicago) 25 89 Syenodiorite, syenogabbro, and granogabbro are introduced as new terms.
1940 Bull. Geol. Soc. Amer. 51 1592 The laccolith near the abandoned wax factory on Fresno Creek..is composed of a striking augite syenodiorite.
1977 A. 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.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).
<
n.1917