L162
L162
Tholeiitic basalt often represents a fine, glassy groundmass consisting of fine-grained quartz and other main constituent minerals. The tholeiitic basalt has fine-porphyritic texture, which is characterized by pyroxene and plagioclase phenocrysts (Fig. 5.39) in fine glassy groundmass.
WhatsAppGet PriceGet A Quote
Porphyritic Basalt | Geology 1501 | ECU
Porphyritic: Origin: Extrusive/Volcanic: Chemical Composition: Mafic: Color: Dark Gray to Black: Mineral Composition: Calcium Plagioclase, Pyroxene: Miscellaneous: Calcium Plagioclase phenocrysts in an aphanitic (Fine-grained) groundmass: Tectonic Environment: Divergent Boundary or Intra-oceanic hot spots
WhatsAppGet PriceGet A Quote
Igneous Rock Identification | Physical Geology
Porphyritic is used as an adjective to modify the name of any fine-grained igneous rock that has less than 50% phenocrysts in it. Example: Porphyritic basalt, porphyritic andesite. Porphyry is used as a noun after the rock name if more than 50% of the rock is made of phenocrysts. Example: Basalt porphyry.
WhatsAppGet PriceGet A Quote
L162
L162
basalt Definition, Properties, & Facts Britannica. Some basalts are quite glassy (tachylytes), and many are very fine-grained and compact. It is more usual, however, for them to exhibit porphyritic structure, with larger crystals (phenocrysts) of olivine, augite, or feldspar in a finely crystalline matrix (groundmass).
WhatsAppGet PriceGet A Quote
Igneous Rocks and the Rock Cycle
Porphyritic textured rocks contain both a coarse and fine-grained texture. The coarse grains in a porphyritic rock begin to develop as the magma is cooling below the surface of the earth. Following eruption or exposure to lower temperatures, the remaining magma or lava cools very quickly and forms minerals with fine-grained textures. As a
WhatsAppGet PriceGet A Quote
Basalts and related mafic volcanics Basalt
Basalts and related mafic volcanics Basalt: Simple petrographic description: Fine-grained to porphyritic volcanic rock composed predominantly of subequal amounts of plagioclase and clinopyroxene (augite). Simple chemical definition: Volcanic rock containing between 45 and 53 % SiO 2.
WhatsAppGet PriceGet A Quote
basalt fine porphyritic
basalt Definition, Properties, Facts Britannica. Some basalts are quite y (tachylytes), and many are very finegrained and compact It is more usual, however, for them to exhibit porphyritic structure, with larger crystals (phenocrysts) of olivine, augite, or feldspar in a finely crystalline matrix (groundmass) Olivine and augite are the most common porphyritic minerals in basalts; porphyritic
WhatsAppGet PriceGet A Quote
Chapter 3 Flashcards | Quizlet
fine-grained coarse-grained porphyritic. false. Metamorphism can affect only sedimentary rocks. (true or false). by crystallization of magma. Igneous rock is formed _____. true. Basalt is the fine-grained equivalent of gabbro. (true or false). have a simi
WhatsAppGet PriceGet A Quote
Geochemical and geochronological studies of Abor volcanic rocks of
Basalt: Fine-grained, porphyritic. Phenocrysts of Pl and Cpx, locally in clusters. They grow to 2.5–3.0 mm in length. Some are euhedral, and Cpx may be twinned. Matrix consists of tiny crystals of Pl, Cpx, Il, Ol or Ep, Spn, Chl set in a glass. The glass may be some 30% and is partly devitrified. Rare, but up to 5-mm large amygdules of
WhatsAppGet PriceGet A Quote
Igneous Rocks and the Rock Cycle
Porphyritic textured rocks contain both a coarse and fine-grained texture. The coarse grains in a porphyritic rock begin to develop as the magma is cooling below the surface of the earth. Following eruption or exposure to lower temperatures, the remaining magma or lava cools very quickly and forms minerals with fine-grained textures. As a
WhatsAppGet PriceGet A Quote
Porphyritic Textures with Coarse-Grained Groundmasses
Porphyritic textures are found in rocks with both coarse- and fine-grained groundmasses. Because larger grains generally indicate longer cooling rates, the phenocrysts indicate that the magma experienced an initial phase of slow cooling deep underground. In rocks with coarse-grained groundmasses, the phase of slow cooling was followed by a
WhatsAppGet PriceGet A Quote
Is basalt porphyritic?
Basalt is the opposite of granite. Basalt is a mafic (dark coloured minerals rich in iron and magnesium)fine grained rock formed from the rapid cooling and crystallisation of lava above ground
WhatsAppGet PriceGet A Quote
Basalts and related mafic volcanics Basalt
Basalts and related mafic volcanics Basalt: Simple petrographic description: Fine-grained to porphyritic volcanic rock composed predominantly of subequal amounts of plagioclase and clinopyroxene (augite). Simple chemical definition: Volcanic rock containing between 45 and 53 % SiO 2.
WhatsAppGet PriceGet A Quote
Geochemical and geochronological studies of Abor volcanic rocks of
Basalt: Fine-grained, porphyritic. Phenocrysts of Pl and Cpx, locally in clusters. They grow to 2.5–3.0 mm in length. Some are euhedral, and Cpx may be twinned. Matrix consists of tiny crystals of Pl, Cpx, Il, Ol or Ep, Spn, Chl set in a glass. The glass may be some 30% and is partly devitrified. Rare, but up to 5-mm large amygdules of
WhatsAppGet PriceGet A Quote
Phenocryst & Porphyritic Textures | Science Trends
A phenocryst is visible large crystal embedded within a fine-grained matrix of smaller crystals. This combination of matrix and phenocrysts forms a porphyritic rock texture. Shape: euhedral forms: Minimum Size: 0.5 millimeter to be considered a phenocryst, i.e. visibly discernable: Term For Large Phenocrysts: megaphenocrysts: Host Rock
WhatsAppGet PriceGet A Quote
L162 Basalt, porphyritic · 1A Collections
Black, porphyritic rock comprising black clinopyroxene, grey feldspar and greenish olivine phenocrysts, in a fine-grained groundmass. Thin-section Plagioclase feldspar
WhatsAppGet PriceGet A Quote
Porphyry
Porphyritic texture is a very common texture in igneous rocks in which larger crystals (phenocrysts) are embedded in a fine-grained groundmass. Porphyry is an igneous rock that contains larger crystals (phenocrysts) in a fine-grained groundmass. K-feldspar phenocrysts in this sample. Width of view 7 cm. TUG 1608-2807.
WhatsAppGet PriceGet A Quote
Basalts from the southeastern Greenland continental margin
Sample OSG 515 is a porphyritic basalt with chloritised plagioclase phenocrysts (13 vol. %) up to 10 mm long and with An46. The inter granular groundmass is fine to medium-grai ned and composed of rather chloritised plagio clase of An33, fresh clinopyroxene, fresh oliv ine, ilmenite and magnetite, minor green-brown biotite and apatite
WhatsAppGet PriceGet A Quote
Basalts and related mafic volcanics Basalt
Basalts and related mafic volcanics Basalt: Simple petrographic description: Fine-grained to porphyritic volcanic rock composed predominantly of subequal amounts of plagioclase and clinopyroxene (augite). Simple chemical definition: Volcanic rock containing between 45 and 53 % SiO 2.
WhatsAppGet PriceGet A Quote
Porphyritic basalt
This altered porphyritic basalt sample is from The Battery, a ruined gun emplacement built towards the end of the 1700s during the American War of Independence, at the entrance to Old Harbour at Dunbar. It became disused by the middle 1800s and was subsequently re-used as a hospital. The basalt is Carboniferous in age with 1-2 mm sized plagioclase phenocrysts and a fine grained groundmass.
WhatsAppGet PriceGet A Quote
Classification of Igneous Rocks
Pitchston e: resinous. Vitrophyre: porphyritic. Perlite: concentric fractures. Pumice: finely cellular, light colored. Scoria: coarsely cellular, dark colored. Normally it is not possible to determine the composition of these rocks. They are customarily designated by the names at the left of this column.
WhatsAppGet PriceGet A Quote
Fine-Grained Porphyritic Textures
Porphyritic Textures with Fine-Grained Groundmasses Many rocks with an overall fine-grained texture display scattered minerals that are more than 1 mm across. This porphyritic texture indicates that the magma sat and cooled a bit below the Earth''s surface, thus giving time for the large crystals to grow, before erupting onto the surface and cooling very quickly.
WhatsAppGet PriceGet A Quote
Basalt
Basalt is often porphyritic, containing larger crystals (phenocrysts) formed prior to the extrusion that brought the magma to the surface, embedded in a finer-grained matrix. These phenocrysts usually are of augite, olivine , or a calcium-rich plagioclase, [11] which have the highest melting temperatures of the typical minerals that can crystallize from the melt and are therefore the first to
WhatsAppGet PriceGet A Quote
Is basalt porphyritic?
Basalt is the opposite of granite. Basalt is a mafic (dark coloured minerals rich in iron and magnesium)fine grained rock formed from the rapid cooling and crystallisation of lava above ground
WhatsAppGet PriceGet A Quote
Geology Igneous Rock Types Flashcards | Quizlet
porphyritic basalt. Fine grained and vesicular (Felsic) NONE. Fine grained and vesicular (Intermediate) Vesicular andesite. Fine grained and vesicular (Mafic) Vesicular basalt . Pyroclastic (Felsic) Rhyolite tuff or breccia (shown) Pyroclastic (Intermedia
WhatsAppGet PriceGet A Quote
Mare Basalt, Touchstone
fine-grained porphyritic mare basalt that has been used to create “touchstones” for public display (see list under Processing). It was collected about 60 m from the Lunar Module and is one of the largest stones returned from the Moon. Neal and Taylor (1993) catalogued 70215 as a “high-Ti, Mare Basalt” and it contains an abundance of
WhatsAppGet PriceGet A Quote
Porphyritic Textures with Coarse-Grained Groundmasses
Porphyritic textures are found in rocks with both coarse- and fine-grained groundmasses. Because larger grains generally indicate longer cooling rates, the phenocrysts indicate that the magma experienced an initial phase of slow cooling deep underground. In rocks with coarse-grained groundmasses, the phase of slow cooling was followed by a
WhatsAppGet PriceGet A Quote
Porphyry
Porphyritic texture is a very common texture in igneous rocks in which larger crystals (phenocrysts) are embedded in a fine-grained groundmass. Porphyry is an igneous rock that contains larger crystals (phenocrysts) in a fine-grained groundmass. K-feldspar phenocrysts in this sample. Width of view 7 cm. TUG 1608-2807.
WhatsAppGet PriceGet A Quote
Porphyritic basalt
This altered porphyritic basalt sample is from The Battery, a ruined gun emplacement built towards the end of the 1700s during the American War of Independence, at the entrance to Old Harbour at Dunbar. It became disused by the middle 1800s and was subsequently re-used as a hospital. The basalt is Carboniferous in age with 1-2 mm sized plagioclase phenocrysts and a fine grained groundmass.
WhatsAppGet PriceGet A Quote
Porphyritic Textures with Coarse-Grained Groundmasses
Porphyritic textures are found in rocks with both coarse- and fine-grained groundmasses. Because larger grains generally indicate longer cooling rates, the phenocrysts indicate that the magma experienced an initial phase of slow cooling deep underground. In rocks with coarse-grained groundmasses, the phase of slow cooling was followed by a
WhatsAppGet PriceGet A Quote
Mecca 500TPH Granite Crushing Plant