leucocratic


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Related to leucocratic: Leucocratic Rock

leucocratic

[¦lü·kə¦krad·ik]
(petrology)
Light-colored as applied to igneous rock containing 0-50% dark-colored minerals.
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The second phase of injection time is close to the main phase and is represented by medium- and fine-grained leucocratic granites with rare potassium feldspar phenocrysts.
LUMINESCENCE OF ROCK-FORMING QUARTZ OF THE GRANITOIDS FROM THE KOLYVAN-TOMSK FOLDED BELT IN RELATION TO FACIES FEATURES OF MASSIF FORMATION
The clinopyroxene-bearing albitite is a leucocratic granoblastic, fine- to medium-grained rock, dominated by albite ([Ab.sub.94-96]) and quartz, with minor amounts of clinopyroxene ([En.sub.30-36] [Fs.sub.12-23]; Na = 0.12-0.15 a.p.f.u.; Mg# = 0.57-0.75); (Figure 4(f)).
Dynamic Metasomatism: Stable Isotopes, Fluid Evolution, and Deformation of Albitite and Scapolite Metagabbro (Bamble Lithotectonic Domain, South Norway)
A leucocratic, medium-grained rock suspected to be nephelinite was also encountered around Uganga hill.
Contrasting styles of lead-zinc-barium mineralization in the Lower Benue Trough, Southeastern Nigeria/Contraste de estilos de mineralizacion de plomo-zinc-bario en la parte baja de la Formacion Benue Trough, en el sudeste de Nigeria
The granite is leucocratic, shows colour variation and at places is a mixture of yellow, brown and black.
Geology and petrography of the Nagar Parkar Igneous Complex, southeastern Sindh: the Wadhrai body
Whole-rock and mineral [sup.40]K/[sup.40]Ar ages have been carried out on mafic and leucocratic sills.
The southern Central America puzzle: cronology and structure: a review
These minerals were collected from miarolitic pegmatites, hydrothermal veins and greisens associated with the upper portions and first-crystallized parts of the peraluminous Mount Antero Granite, especially within the leucocratic variant of the granite.
The 29th annual FM-MSA-TGMS Tucson Mineralogical Symposium classic mineral localities of the United States
Spectacular outcrops of such bodies can be seen from the sea on the coastal cliffs of the mountains north of San Pablo, where the leucocratic material, chiefly in thick tabular bodies, accounts for about 20 to 30% of the outcrops.
Las rocas intrusivas basicas-ultrabasicas del Complejo Estratificado del Vizcaino y la ofiolita del Vizcaino (Baja California Sur, Mexico)
The granites in this area are leucocratic in appearance and vary in color and mineralogical composition.
Geo-electrical surveys for groundwater in Kagna river sub-basin, Pargi Mandal, Ranga Reddy District, A.P., India
Anil points out that "Webster's 2nd defines pilandite as 'a leucocratic porphyry with phenocrysts, a groundmass of anorthoclase, and a little amphibole" and adds "Well at least I know what 'a', 'with', 'of', 'and', and 'little' mean." I checked the definition and it concludes with "Cf.
Kickshaws
The main rock types in this borehole are biotite gneisses and sillimanite-biotite gneisses to metatexites (stromatitic migmatites) with relatively rare intercalations of diatexites (leucocratic migmatites).
Geochemical constraints of origin and evolution of migmatites in the central part of the Moldanubian Zone (Temelin area), Bohemian Massif
Also of great interest are newly discovered jadeite deposits in the Polar Urals (Levy Kechpel, etc.), represented by veins in the leucocratic gabbroid mass.
Russian minerals
The Karunjhar Hill granite is gray, partly fresh and leucocratic, coarse grained.
GRANITES OF THE NAGAR PARKAR AREA, SINDH, PAKISTAN: A SUSTAINABLE NATURAL RESOURCE

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