ankaratrite

ankaratrite

[‚aŋ·kə′rä‚trīt]
(petrology)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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It should be noted that the most mafic tholeiitic and potassic ASV rock-types are relatively evolved compared with expected primary compositions (e.g., Mg# >0.60-0.65, Ni >235 ppm), ankaratrite is excepted.
These consist mainly of ankaratrites + (mela)nephelinites (45%) and phonolites (42%) (CominChiaramonti et al.
Phenocrysts-microphenocrysts in ankaratrites and nephelinites are characterized by olivine (phenocrysts 1-7vol%, [Fo.sub.89-85] mole%; 1-6vol% microphenocrysts, [Fo.sub.82-77] mole%), clinopyroxene (phenocrysts 1-6vol%, Mg# ~0.8), titanomagnetite (0.3-0.7vol%, up to 38 ulv.