How To Use Plagioclase In A Sentence
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The main constituent phases of these rocks are plagioclase, hornblende, pyroxene, quartz and K-feldspar, and accessory phases include magnetite, sphene, zircon and apatite.
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This granulite consists of garnet, biotite, muscovite, quartz, plagioclase and cordierite.
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The mineral assemblage comprises quartz, K-feldspar, albitic plagioclase, white mica, apatite, tourmaline and garnet.
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Like zircon, quartz, plagioclase, biotite and hornblende, major phenocryst phases, also show variable resorbtion effects.
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The pegmatite is composed of microcline, plagioclase and quartz with minor amounts of clinopyroxene, orthopyroxene, ilmenite and zircon.
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The Borve Series is dominated by varieties of quartzo-feldspathic schist and gneiss, composed mainly of plagioclase, quartz, and biotite.
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The more altered dykes of the Black Coast have groundmasses of clinopyroxene, plagioclase and rare biotite.
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Second, in a process known as differentiation, crystals of olivine, clinopyroxene, and plagioclase began to crystallize from the magma, and being more dense than the magma, they settled to the bottom of the chamber.
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Plagioclase, microcline and quartz are the predominating minerals, while biotite, titanite, epidote, apatite, zircon and garnet are present in smaller quantities.
The Long Labrador Trail
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Strain shadows around feldspar porphyroclasts contain recrystallized potassium feldspar, plagioclase and quartz.
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The sample is strongly foliated and consists of garnet, biotite, quartz, plagioclase and cordierite.
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The mineral assemblage is quartz + plagioclase + K-feldspar + biotite + cordierite + andalusite fibrolite.
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The sample is composed of K-feldspar, plagioclase and quartz with accessory apatite, magnetite, titanite, zircon and secondary epidote.
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The crustal differentiation processes were dominated by fractionation of olivine, chrome spinel, plagioclase and clinopyroxene, leading to evolved compositions.
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A bleb of glass with clinopyroxene and plagioclase is located below and to the right of the large plagioclase phenocryst.
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Coexisting MI phases in these rocks include garnet, plagioclase, quartz, tourmaline and fluorite.
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The plagioclase feldspar weathers to produce a whitish gray rock, while the mafic minerals (olivine, augite and hypersthene) produce contrasting darker grains.
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Plagioclase remains a stable phase within the rock, though the mafic minerals have been altered primarily to chlorite + epidote.
U-Pb and Ar-Ar constraints on the age of granitic intrusions beneath Medicine Lake Volcano, California, USA
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Late phases are mainly calcic amphiboles of magnesio-hornblende composition and plagioclases with very low anorthite contents.
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The intervening host-rock layers are between 2 and 5 cm thick, being composed of biotite, sillimanite, garnet, muscovite, quartz and plagioclase.
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It is a reddish brown sandstone formed by detrital quartz, plagioclase, feldspar and muscovite, with subordinate apatite, zircon and opaque minerals.
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Thus the order of phenocryst appearance in Kilauea lavas is olivine, plagioclase, augite whereas in Mauna Loa lavas it is olivine, augite, plagioclase.
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The mineral assemblage comprises quartz, K-feldspar, albitic plagioclase, white mica, apatite, tourmaline and garnet.
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The latter form by dehydration melting at less than 10-12 kbar leaving a residue of augite, orthopyroxene, plagioclase and varying amounts of amphibole.
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Hornblende forms elongate prisms that define a lineation together with plagioclase.
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Layered intrusions commonly occur with mafic intrusions where the minerals (such as olivine, pyroxene, chromite, magnetite and plagioclase) have a wider range of specific gravity, and the magma viscosity was low.
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All monazite grains are located in the rock matrix, which consists of quartz, muscovite, biotite, epidote, chlorite, plagioclase, potassium feldspar and garnet with a granoblastic texture.
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Plagioclase is commonly variably replaced by aluminous prehnite, which indicates temperatures below 400°C.
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They have a mineralogical association of quartz, diopside, actinolite, plagioclase and K-feldspar.
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Coexisting MI phases in these rocks include garnet, plagioclase, quartz, tourmaline and fluorite.
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Because of the preponderance of the mineral anorthite (a calcium-rich variety of the mineral plagioclase feldspar) this rock type is called anorthosite.
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The sample is a weakly foliated granulite formed of plagioclase, orthopyroxene, clinopyroxene and minor hornblende.
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The plagioclase crystals would have formed subcircular lenses of anorthosite that punctuated background chromite accumulation.
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Mesosomes are invariably associated with a leucosome component and are composed of biotite accompanied by fibrolite, minor quartz, plagioclase and retrograde muscovite and chlorite.
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They typically comprise early olivine and plagioclase, ophitically enclosed by augite, with opaque oxides and apatite.
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The original porphyritic texture with plagioclase phenocrysts is still recognizable.
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A second textural type of titanite forms anhedral grains with plagioclase and pargasite, which is developed where the retrograde amphibolite-facies assemblage overprints the eclogite mineralogy.
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The magmatic evolution is dominated by low-pressure crystal fractionation of olivine, Cr-spinel, plagioclase and clinopyroxene.
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The principal minerals are, plagioclase, biotite and microcline, with smaller quantities of quartz, iron oxide, pyroxene and garnet.
The Long Labrador Trail
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It consists of quartz, K-feldspar, plagioclase, biotite and white mica, and in places displays a graphic texture.
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These rocks are composed predominantly of the minerals plagioclase feldspar, amphibole, and pyroxene.
Igneous rock
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Basalt is a fine-grained igneous rock that is primarily composed of the iron- and magnesium-rich minerals pyroxene and olivine and calcium-rich plagioclase feldspar.
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Olivine and plagioclase continue to crystallize in the upper layer until critical concentrations are again reached and another pulse of sedimentation occurs.
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A usually coarse - grained igneous rock composed chiefly of calcic plagioclase and pyroxene.
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I was staring a Ca-rich plagioclase and pyroxenes and ilmentite.
Snell-Pym » 2008 » September
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The samples from the andesitic units, occurring as tectonic lenses in the greywacke sequence, exhibit plagioclase phenocrysts altered to sericite, calcite and epidote, set in a matrix of chloritized pyroxene and amphibole.
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The most common phenocryst silicate phases are olivine, plagioclase and augite, typically, although not always, appearing in that order.
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The semi-pelites usually consist of biotite, quartz, plagioclase and untwinncd feldspar, and garnet forms abundant porphyroblasts in some varieties.
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Feldspar is dominated by microcline, but plagioclase and perthitic feldspar are also present.
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Plagioclase, microcline and quartz are the predominating minerals, while biotite, titanite, epidote, apatite, zircon and garnet are present in smaller quantities.
The Long Labrador Trail
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The main constituent phases of these rocks are plagioclase, hornblende, pyroxene, quartz and K-feldspar, and accessory phases include magnetite, sphene, zircon and apatite.
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All monazite grains are located in the rock matrix, which consists of quartz, muscovite, biotite, epidote, chlorite, plagioclase, potassium feldspar and garnet with a granoblastic texture.
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The landslide and debris flow based on plagioclase coincidently locate in ringed mountains.
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The tonalite is characterized by a strong fabric defined by aligned plagioclase, hornblende and biotite that is interpreted to be a magmatic state deformation fabric formed during emplacement.
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Relict coarse, lath-shaped omphacites are variably preserved, but all are either partially retrogressed to pargasite or have been pseudomorphed by diopside-plagioclase symplectites.
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Several small grains of amphibole were seen as inclusions in a plagioclase phenocryst, and one partial grain of resorbed amphibole also was noted.
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The biotite-granite continues these trends of increasing orthoclase over plagioclase and biotite over homblende, to produce a coarse-grained pink porphyritic rock in which orthoclase phenocrysts dominate.
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This flow consists of about 30 percent plagioclase, clinopyroxene, and olivine, as small phenocrysts.
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In the most complete survey of what is called the Rock Hill gabbro, Chalcraft mapped a large area of gabbroic anorthosite (77.5-90% calcic plagioclase) at the site where the preserve is located.
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A large pebble with a gneissose appearance is a retrograded orthogneiss, consisting of quartz, plagioclase, feldspar and muscovite, with relics of biotite, mostly chloritized, and a weakly folded tectonic foliation.
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Perhaps 75\% of this is the plagioclase feldspars (mostly albite, oligoclase and labradorite) with the remainder as potassium feldspars (mostly microcline and orthoclase).
Netvouz - new bookmarks
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This flow consists of about 30 percent plagioclase, clinopyroxene, and olivine, as small phenocrysts.
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The main constituent phases of these rocks are plagioclase, hornblende, pyroxene, quartz and K-feldspar, and accessory phases include magnetite, sphene, zircon and apatite.
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Quartz, microcline or orthoclase and plagioclase are ubiquitous in the Everest granites, which also contain varying amounts of tourmaline, muscovite, biotite and garnet.
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They have a mineralogical association of quartz, diopside, actinolite, plagioclase and K-feldspar.
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The siltstones contain poorly sorted angular fragments of quartz, and angular clasts and cleavage fragments of plagioclase and alkali feldspar.
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This granulite consists of garnet, biotite, muscovite, quartz, plagioclase and cordierite.
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Some of the studied rocks (particularly gabbros) show high alumina characteristics probably reflecting the high modal content of very calcic plagioclase.
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The Bakfjord Granite contains quartz, K-feldspar, biotite, plagioclase, epidote, allanite, muscovite and occasional garnet.
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A plagioclase feldspar, albite probably, occurs as parallel growths of transparent colorless to yellowish crystals.
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The sample is a weakly foliated granulite formed of plagioclase, orthopyroxene, clinopyroxene and minor hornblende.
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The coarse-grained sandstone matrix is dominated by feldspathic litharenites with 50-70% quartz, 2-5% K-feldspar and 10-15% plagioclase.
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Of course plagioclase feldspars are also one of my favorites so I might be a little partial here.
5 Minerals
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The composition of the aplites suggests a multistage evolution that involved plagioclase-dominated fractionation of a fugitive melt batch.
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The stretching lineation is commonly defined by biotite and by recrystallized plagioclase in tails surrounding rotated, moderately retrograded, garnet porphyroclasts.
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The rock consists of plagioclase, K-feldspar, quartz, clinopyroxene and biotite, with abundant apatite, and ilmenite.
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Aligned igneous minerals of euhedral potassium feldspar, plagioclase, biotite and hornblende in an undeformed quartz matrix define a magmatic foliation.
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Like P133, it consists mainly of quartz, feldspar and white mica; plagioclase can also be distinguished under the microscope.
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Rhyolite dykes, which are commonly porphyritic with phenocrysts of either plagioclase or quartz, are intruded by dykes of hornblende tonalite, and the gabbro is likewise intruded by tonalite dykes.
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It consists of clasts of angular to rounded quartz, plagioclase, tourmaline and rock fragments, up to 3 mm in diameter.
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The minerals included in this group are orthoclase, microcline, and the plagioclase feldspars.
Feldspar
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The change from incompatible to compatible behavior heralds the onset of significant plagioclase (or feldspathoid) precipitation/removal.
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The majority of the rhyolites are porphyritic and contain phenocrysts of one or more of the following: plagioclase, clinopyroxene, magnetite, quartz and sanidine, plus accessory apatite and zircon.
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The titanite grains from Zones 1 and 2 show marginal growth interstitial to newly grown crystals of metamorphic minerals such as plagioclase, biotite and zoisite.
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Tauride dykes contain less calcic plagioclase than their host cumulates, like the Kinik ophiolites.
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The Johnstown meteorite is classified as a calcium-poor diogenite, being composed mainly of hypersthene, with minor amounts of plagioclase and olivine.
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The majority of the rhyolites are porphyritic and contain phenocrysts of one or more of the following: plagioclase, clinopyroxene, magnetite, quartz and sanidine, plus accessory apatite and zircon.
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A fine grained compact gray rock, of aggregate structure, consisting chiefly of quartz, plagioclase and biotite, and the alteration products epidote and sericite.
The Long Labrador Trail
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Most of the larger oxides and plagioclase are interstitial, having grown in the intercumulus pore spaces.
Lunar regolith
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The magmatic evolution is dominated by low-pressure crystal fractionation of olivine, Cr-spinel, plagioclase and clinopyroxene.
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All of these rock types are light in color because of the dominance of quartz, potassium and sodium feldspars, and plagioclase feldspar minerals (Figure 1).
Igneous rock
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The first phase of diagenetic albite constitutes an impure, turbid variety including albitized grains of original plagioclase and alkali feldspar.
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Plagioclase dramatically removes Sr at intermediate stages and alkali feldspars sequester Ba and Rb as late-stage trachytes and phonolites form in alkaline magmas.
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The sample is strongly foliated and consists of garnet, biotite, quartz, plagioclase and cordierite.
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The volcanics were described by Aghabawa as alkaline basalts, hawaiites and mugearites with plagioclase, olivine and augite as the essential constituents.
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The minerals included in this group are orthoclase, microcline, and the plagioclase feldspars.
Feldspar
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The metabasites typically contain coarse-grained hornblende, biotite and plagioclase with accessory titanite.
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The pegmatite is composed of microcline, plagioclase and quartz with minor amounts of clinopyroxene, orthopyroxene, ilmenite and zircon.
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Feldspar (including sanidine and plagioclase) separates were handpicked from a 62-125 mm sieve fraction crushed from megacrysts.
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As cooling continues, plagioclase (a mixture of two kinds of aluminum silicates) and the pyroxene mineral augite (a magnesium silicate mixed with some iron) form.
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The siltstones contain poorly sorted angular fragments of quartz, and angular clasts and cleavage fragments of plagioclase and alkali feldspar.
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Because of the preponderance of the mineral anorthite (a calcium-rich variety of the mineral plagioclase feldspar) this rock type is called anorthosite.
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It consists of clasts of angular to rounded quartz, plagioclase, tourmaline and rock fragments, up to 3 mm in diameter.
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The severe crushing to which the rock has been subjected has resulted in the conversion of the plagioclase into scapolite and also in the formation of zoisite by the characteristic alteration of the lime bearing silicate of the feldspar in conjunction with other constituents of the rock.
The Long Labrador Trail
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The greenschist-facies overprint resulted in the growth of actinolitic amphiboles, plagioclase and titanite at the expense of pyroxene and rutile or ilmenite.
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(Feldspar) plagioclase, alkali-feldspar (H 6-6. 5)
Volcanic ash hazards and ways to minimize them
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The sample is weakly banded amphibolite-facies gneiss consisting of quartz, plagioclase, biotite and hornblende.
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They are basaltic flows rich in zeolites and phenocrysts (plagioclase, olivine and pyroxene), and intercalated with strombolian and phreatomagmatic deposits.
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This sample contains large plagioclase and pyroxene crystals, some of which have a sponge-like texture.
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This granulite consists of garnet, biotite, muscovite, quartz, plagioclase and cordierite.
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Based on the crystal growth elementary principle, a plagioclase crystalline velocity equation is suggested.
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The majority of the rhyolites are porphyritic and contain phenocrysts of one or more of the following: plagioclase, clinopyroxene, magnetite, quartz and sanidine, plus accessory apatite and zircon.
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Garnet occurs as euhedral porphyroblasts ranging from 0.5 cm to >20 cm in diameter and contains inclusions of plagioclase, ilmenite, staurolite and orthoamphibole.
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They contain olivine, clinopyroxene, plagioclase, analcite, ulvospinel and apatite + / - biotite + / - calcite.
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They have a porphyritic texture with prismatic plagioclase phenocrystals, small, aciculate plagioclase crystals and a partially devitrified, near-opaque matrix.
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Dacite lava hand sample, with abundant amphibole and plagioclase feldspar. magma mixing or crustal assimilation (by another magma) to form the dacite.
ScienceBlogs Channel : Life Science
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Major mineral phases include plagioclase and pyroxene, with small amounts of opaque minerals, olivine, apatite, and sometimes biotite.
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The pegmatite is composed of microcline, plagioclase and quartz with minor amounts of clinopyroxene, orthopyroxene, ilmenite and zircon.
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Olivine and plagioclase continue to crystallize in the upper layer until critical concentrations are again reached and another pulse of sedimentation occurs.
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The plagioclase feldspar weathers to produce a whitish gray rock, while the mafic minerals (olivine, augite and hypersthene) produce contrasting darker grains.
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The original hornblende crystals have partially decomposed to form a mesh of ortho- and clinopyroxene and extremely calcic plagioclase.
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I found a moonstone (the plagioclase feldspar oligocase) almost as big as my fist, almost perfectly round.
"The tides will come and go, witnessed by no waking eye."
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Coexisting MI phases in these rocks include garnet, plagioclase, quartz, tourmaline and fluorite.
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This alteration consists of quartz veinlets, clays, sericite, pyrite, and iron-oxides replacing feldspar, ferromagnesian minerals and plagioclase.
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The Henry Mountains consist of multiple intrusions of quartz-monzonite porphyries (predominantly plagioclasehornblende rocks) that were emplaced from 29.2 to 20.0 million years ago into a thick sequence of Mesozoic sediments.
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The Stephens Creek Shear Zone contains a peak assemblage of garnet-plagioclase-staurolite-biotite, with staurolite overgrowing garnet.
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This granulite consists of garnet, biotite, muscovite, quartz, plagioclase and cordierite.
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The most common phenocryst silicate phases are olivine, plagioclase and augite, typically, although not always, appearing in that order.
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The mineral assemblage comprises quartz, K-feldspar, albitic plagioclase, white mica, apatite, tourmaline and garnet.