syenogabbro

syenogabbro

[¦sī·ə·nō′ga‚brō]
(petrology)
Plutonic rock consisting of basic plagioclase, orthoclase, and a dark mineral such as augite.
References in periodicals archive ?
Figure 5 shows the extent of the favourable brucite-bearing zone in the Marble Canyon area of Texas, which developed in dolomitic rocks that surrounded an elliptically shaped intrusive complex, consisting of horn-blende-bearing granite, syenodiorite and syenogabbro (Newman and Hoffman 1996).