What is monzogabbro in geology ?
Monzogabbro : definition
A monzogabbro is a plutonic rock intermediate between monzonite and gabbro, equivalent to trachybasalt, also called syenogabbro.
It is a grainy rock, usually dark in color, with largely dominant plagioclase (labrador), orthoclase present but rare, interstitial pyroxene (diopside, augite, hypersthene), brown hornblende, biotite and sometimes olivine. Monzogabbro is distinguished from microdiorite by a more calcium plagioclase.
Monzogabbros are rare rocks, present in basic massifs, associated with diorites or gabbros.
It is a grainy rock, usually dark in color, with largely dominant plagioclase (labrador), orthoclase present but rare, interstitial pyroxene (diopside, augite, hypersthene), brown hornblende, biotite and sometimes olivine. Monzogabbro is distinguished from microdiorite by a more calcium plagioclase.
Monzogabbros are rare rocks, present in basic massifs, associated with diorites or gabbros.