orthocumulate

orthocumulate

[‚ȯr·thə′kyü·myə·lət]
(petrology)
A cumulate composed chiefly of one or more cumulus minerals plus the crystallization products of the intercumulus liquid.
References in periodicals archive ?
Massive and mottled rocks may show adcumulate (~93-100% cumulus phase), mesocumulate (~85-93%), or orthocumulate (~75-85%) texture, with mottled rocks comprising two or more textures in close association (cm- to m-scale).
Textures range from orthocumulate to granular, with some granular-textured dykes showing pervasive foliation and modal layering striking parallel to the walls.
These interstitial areas are interpreted as having crystallized as an orthocumulate liquid trapped by the settling and accumulation of the kaersutite and magnetite megacrysts in a magma chamber at depth.