How to use porphyritic in a sentence

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Sentence Examples The original porphyritic texture with plagioclase phenocrysts is still recognizable. It grades inwards over tens to hundreds of metres into a coarser-grained porphyritic granodiorite. It is dominated by variably foliated, medium-grained, even-textured to porphyritic biotite hornblende tonalite and quartz diorite. A violet, coarse-grained, porphyritic quartz syenite, which makes up large parts of the pluton, was collected for dating. Coarser fractions additionally contain volcanic clasts of vesicular and porphyritic lava, tuff and pumice. It is a light grey, porphyritic volcanic to subvolcanic rock, which shows almost no deformation. The Kleef Formation includes redbeds, porphyritic to glomeroporphyritic basalt and pumiceous, lithic tuff to lithic lapilli-tuff. The Big Scott Mountain Formation consists of, porphyritic to nearly aphyric rhyolite, lithic to lithic lapilli-tuff and crystal tuff. These crystals eventually form the phenocrysts found in porphyritic rocks. They have a porphyritic texture with prismatic plagioclase phenocrystals, small, aciculate plagioclase crystals and a partially devitrified, near-opaque matrix. From 145.0 to 160.0 meters it traversed several albite-ankerite altered and deformed porphyritic dykes injected with quartz veinlets. They commonly have a porphyritic texture, i.e., larger crystals within a finer-grained groundmass, indicating two periods of crystallization. Basalts, rhyolites, and porphyritic andesites from the Newbery Volcanics in northeastern Massachusetts were formed during the Pridoli Epoch. Most rhyolites are porphyritic, indicating that crystallization began prior to extrusion. In fact, porphyritic dykes, shear zones, and quartz veins were observed South and South West of the former Granada Mine. The porphyritic rock on which Reinhold Messner's Sigmundskron castle towers has been effectively captured in this exclusive accessory. The granite is chiefly of porphyritic, biotite-granite but includes a section of two-mica granite in the lower part of the borehole. Sigmundskron was built of large porphyritic rocks and towers over a giant porphyritic hill. Several of the youngest porphyritic lava flows have not been heavily glaciated. A limited edition of 10,000 small porphyritic rock segments is now being sent off as an exclusive design by Berendsohn. Show More Sentences These units were later intruded by quartz-feldspar porphyritic intrusions and by intermediate and basic dykes. They are enclosed within typical porphyritic granite, which has a gently dipping compositional layering that is parallel to the axial planes of the eye structures. The southern, topographically highest parts of the Mpuluzi batholith are made up of coarsely porphyritic monzogranite characterized by abundant microcline megacrysts. Recent drilling on the property highlighted favourable horizons for gold mineralization, namely iron formations and ultramafic flows cut by porphyritic dykes. The basic volcanics are altered andesites, porphyritic diabases and andesites, and various pyroclastics. They are very commonly porphyritic, vitreous, and sometimes even vesicular. Basaltic to andesitic rocks of the East Bay Hills Group are typically aphanitic and massive, with slight to moderate porphyritic textures. The workings appear to loosely follow the upper contact of a grey, altered rhyolitic tuff with an overlying porphyritic rhyolite unit. They have porphyritic texture with plagioclase phenocrystals in a subophitic to intersertal groundmass. This area is the largest resource of porphyritic rock in the world. The porphyritic dykes also contain similar sulphides finely disseminate. The bedrock in the area is dominated by porphyritic, pillowed and locally magnetic basalts, cut by diorite intrusions, felsic porphyry intrusions, and a swarm of NE-trending diabase dykes. The Toqui property is situated in an area of Jurassic-Cretaceous volcanic and volcano-sedimentary rocks, which are intruded by intermediate to felsic porphyritic bodies of Upper Cretaceous to Tertiary age. Unit G is composed of sparsely to moderately porphyritic basalt, with gabbroid xenoliths, plagioclase glomerocrysts and olivine microphenocrysts. They are medium to fine grain-sized, with equigranular and occasionally porphyritic hypidiomorphic textures. The texture of andesite is generally porphyritic, with phenocrysts of feldspar and ferromagnesian minerals. The drilling carried out during 2009 has identified horizons favourable for gold mineralization, namely an iron formation and ultramafic flows intruded by porphyritic dikes. At the property scale, the above-mentioned shear cuts mafic to felsic flows as well as sediments intruded by numerous quartz-feldspar porphyritic dykes. The porphyritic biotite granite is a felsic rock as a result of the presence of larger amount of leucocratic minerals that include the quartz and the feldspars. The South Oromocto Andesite is composed of at least three flow units with the basal flow being the most areally extensive and the only one exhibiting porphyritic textures. Show More Sentences The Bailey Rock Rhyolite is a porphyritic lava and, like other lavas, is characterized by an absence of angular crystal fragments and pumice pseudomorphs. The oldest volcanic rocks at Mount Cayley represent the Mount Cayley stage of eruption, and consist of a complex pile of porphyritic dacite flows, tephra, and breccia. Mafic rocks include massive to very amygdaloidal, locally porphyritic, fine-grained maroon or dark greenish grey basalt, and extensive belts of ash and lapilli tuff. The sample consists of light grey, sparsely porphyritic, aphanitic rhyolite with potassium feldspar, and lesser amounts of quartz and granophyre phenocrysts. A granitic rock with a porphyritic texture is known as a granite porphyry. The outer archways, which were added later in 1907, are a pink, massive, coarse-grained, K-feldspar porphyritic biotite granite containing biotite psammite xenoliths. Porphyritic acidic volcanic rocks are widespread and referred to a calc-alkaline suite from an active margin setting. Examples from Classical Literature Some of the porphyritic rocks above mentioned are highly quartzose, others very felspathic. Many dolerites are porphyritic and carry phenocrysts of olivine, augite and plagioclase felspar. That is, the metamorphic rocks are characteristically holocrystalline, while igneous rocks are porphyritic, or cryptocrystalline. Some of the greenstone is handsomely porphyritic, and embraces green crystals of feldspar. The leucite is often present in two sets of crystals, both porphyritic and as an ingredient of the ground mass. The lavas comprise dark pitchstone, resembling that at Kirk Yetholm, and porphyritic and amygdaloidal andesites and basalts. In the main the lava is an andesite, and is very generally of a porphyritic structure. From two to three feet of mighty greenstone penetrate these porphyritic rocks. The sands and sandstones become highly crystalline quartzites, spotted with porphyritic developments of silicates. Subsequently the porphyritic rock flowed over the surface in a pasty mass, covering the limestone. The next rock is a porphyritic horn-stone, and splintery horn-stone. Long before this it existed as a slate and porphyritic line of hills. The soil, in fact, was bestrewn with quartz and porphyritic rocks. Find more words! 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What is the adjective for porphyritic? What is the noun for porphyritic? Use our Sentence Generator Nearby Words porphyrin porphyria porousness porously porous porosity porphyry porpoise porpoised porpoises porpoising porrect 11-letter Words Starting With p po por porp porph porphy porphyr porphyri porphyrit porphyriti