plagioclasedominated
Plagioclase-dominated refers to a mineralogical condition in which plagioclase feldspar is the most abundant mineral phase in a rock. The term is used in igneous petrology to describe rocks whose modal assemblage is controlled by plagioclase over other common minerals such as pyroxene, olivine, quartz, or alkali feldspar. In practice, plagioclase may account for a majority of the mineral content, and rocks can be described as plagioclase-dominated even when other minerals are present.
Plagioclase is a continuous solid solution series between the sodium-rich endmember albite and the calcium-rich endmember
Common occurrences include mafic to intermediate igneous rocks such as basalt, gabbro, diorite, and related rocks,
The designation helps petrologists infer crystallization conditions, including magma differentiation, pressure, and water content, because the