cumulate

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cumulate

[′kyü·myə‚lāt]
(petrology)
Any igneous rock formed by the accumulation of crystals settling out of a magma.
References in periodicals archive ?
Unlike these ophiolites the Muslim Bagh ophiolite has a less developed gabbroic section and its crustal part and consists of cyclic succession of ultrmafic-mafic cumulates at the base which grades upward into foliated gabbros.
The geochemical features of the major and trace elements show that the rocks have both cumulates and non-cumulates phases and that all the three minerals; olivine, pyroxenes and plagioclases (ol + pyx + pl) are involved in the fractionation process.
Anorthosite is synonymous with a range of plagioclase cumulates that include anorthosite sensu stricto ([greater than or equal to] 90 vol% plagioclase) as well as leuconorite, leucotroctolite and leucogabbronorite (each containing 67.
5-100 vol% plagioclase, (2) minor amounts of gabbronorite and ferrodiorite, (3) lack of complementary mafic-ultramafic cumulates, (4) predominantly massive adcumulate-mesocumulate texture, (5) mottling, foliation, and modal layering, (6) block structure, (7) plagioclase ([An.