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Mining porphyritic texture

Nov 13, 2021 The porphyritic texture is termed as felsophyric and vitrophyric depending on the nature of groundmass, i.e. whether the groundmass is cryptocrystalline or glassy respectively. ii. Poikilitic texture: The texture is said to be poikilitic when smaller crystals are enclosed within larger crystals without any preferred orientation

  • Porphyritic Rhyolite | Geology 1501 | ECU
    Porphyritic Rhyolite | Geology 1501 | ECU

    Type: Igneous Rock: Texture: Porphyritic: Origin: Extrusive/Volcanic: Chemical Composition: Felsic: Color: Light Green: Mineral Composition: Potassium Feldspar

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  • Porphyritic Granite, Herringbone — Architextures
    Porphyritic Granite, Herringbone — Architextures

    Description. A seamless stone texture with porphyritic granite blocks arranged in a herringbone pattern. The image represents a physical area of 3224 x 2543 mm (126.9 x 100.1 inches) in total, with each individual block measuring approximately 750 x 50mm. The joints are filled with rough concrete and are 10 mm (0.4 inches) in width

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  • Geology Fundamentals: Identifying Igneous Rocks in the
    Geology Fundamentals: Identifying Igneous Rocks in the

    Jul 10, 2020 While reading the latest mining news, ... These rocks exhibit intermediate grain size and often a porphyritic texture. Magmas emplaced near the surface cool relatively quickly, hence hypabyssal rocks are believed to be the transitional rocks between the intrusive and extrusive. Hypabyssal intrusions occur as volcanic necks, dikes, and sills

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  • Which rock can have porphyritic texture? – AnswersToAll
    Which rock can have porphyritic texture? – AnswersToAll

    Feb 19, 2021 Porphyritic texture is an igneous rock texture in which large crystals are set in a finer-grained or glassy groundmass. Porphyritic textures occur in coarse, medium and fine-grained igneous rocks. Usually the larger crystals, known as phenocrysts, formed earlier in

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  • Distribution of Marginal Texture in the Quanah Granite
    Distribution of Marginal Texture in the Quanah Granite

    porphyritic facies, GMLC. Note the angular geometries of the fine and porphyritic facies. Mining pits are marked with crossed pick and hammer. The topographic base is the U.S.G.S. Quanah Mountain 7.5’ quadrangle, Oklahoma, 10’ contour interval. Figure 6 – Field photos of the Quanah Granite margin. A.) Porphyritic facies texture in the

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  • Rock Textures - Geology for Today - Dr. Tambra L. Eifert
    Rock Textures - Geology for Today - Dr. Tambra L. Eifert

    Porphyritic texture is represented by igneous rocks which have minerals grains of different sizes. The larger minerals are called phenocrysts. The smaller ones are collectively known as groundmass, which is simply the grains between the phenocrysts. The groundmass can be aphanitic or phaneritic; therefore, the only requirement for this type of

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  • Phaneritic versus Porphyritic textures - YouTube
    Phaneritic versus Porphyritic textures - YouTube

    How to differentiate a plutonic texture from a volcanic porphyritic texture

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  • Geology Exam 1 study guide Flashcards | Quizlet
    Geology Exam 1 study guide Flashcards | Quizlet

    underground mining. land substance, tunnel collapse, miners trapped. rocks. materials of the solid earth ... extremely rapid cooling produced glassy texture. glassy texture. no crystal (formed on the surface) alphantic texture. fine grained (formed underground) phaneritic texture. coarse grained. porphyritic texture. different size (mineral has

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  • Porphyry or Porphyritic? Glomeroporphyritic? | Facebook
    Porphyry or Porphyritic? Glomeroporphyritic? | Facebook

    Oct 04, 2017 Porphyry or porphyritic rock or porphyritic texture are terms used to describe igneous rocks in which there are large crystals, called phenocrysts, in a finer groundmass or matrix. The groundmass can have crystals that are visible to the naked eye or with a handlens, in which case it is termed phaneritic, or it can have crystals that are not visible to the naked eye or even with a handlens

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  • Chapter 3: Igneous Textures
    Chapter 3: Igneous Textures

    Chapter 3: Igneous Textures • Magmatic reaction and resorption – Fig. 3.10 is an example – Olivine OPX – Resorption – refusion or dissolution of mineral back into the melt or solution from which it formed – Resorbed crystals commonly have rounded corners or are embayed – Sieve texture (Fig. 3.11a) – evidence for advanced

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  • (PDF) The Ertsberg Stockwork Zone: A Unique Porphyry
    (PDF) The Ertsberg Stockwork Zone: A Unique Porphyry

    Very intense endoskarn alteration fractures. However, at one location (on the obliterates porphyritic texture of the dikes by northwest side of the system) there is a 20 altering the entire rock mass to garnet and meter wide occurrence of this phyllic alteration clinopyroxene. Tremolite is the main type

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  • Phaneritic Texture - Mining Fundamentals
    Phaneritic Texture - Mining Fundamentals

    Apr 21, 2014 Phaneritic Texture - Mining Fundamentals. Igneous textures are used by geologists in identifying the origin of rocks, and for the classification of rocks. Phaneritic texture is one of the six main textures of rocks. Phaneritic rocks are intrusive igneous rocks with coarse crystals of equal size. Phaneritic rocks indicate slow cooling of magma

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  • Igneous Rocks and the Rock Cycle
    Igneous Rocks and the Rock Cycle

    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 result, porphyritic textures contain both coarse- and fine–grained minerals. 8

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  • PORPHYRY DEPOSITS - Earth Sci
    PORPHYRY DEPOSITS - Earth Sci

    The term porphyry copper now includes engineering as well as geological considerations; It refers to large, relatively low grade, epigenetic, intrusion-related deposits that can be mined using mass mining techniques. Geologically, the deposits occur close to or in granitic intrusive rocks that are porphyritic in texture

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  • Porphyry (geology) - Wikipedia
    Porphyry (geology) - Wikipedia

    Most igneous rocks have some degree of porphyritic texture. This is because most magma from which igneous rock solidifies is produced by partial melting of a mixture of different minerals. When a body of magma slowly cools underground, the mineral with which the magma is most saturated begins crystallizing from the magma first, forming phenocrysts

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  • Igneous Rocks: Texture and Classification | Geology
    Igneous Rocks: Texture and Classification | Geology

    It may be due to operation of factors mentioned above (for porphyritic texture) but in a different manner. In this case, the molecular concentration of host minerals should be greater and these should crystallise under favourable conditions only towards the end of the process so that these are capable of enclosing many other crystals formed at earlier stages in the process

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  • Igneous Rocks - SOEST
    Igneous Rocks - SOEST

    11 Photomicrograph of Granite Classification of Igneous Rocks Based on Mineral Composition and Texture Textures-reflect rate of cooling• Phaneritic-mineral crystals are visible e.g. Granite & Gabbro• Pegmatite-exceptionally large crystals e.g. Pegmatite• Aphanitic-crystals not visible e.g. Rhyolites & Basalt• Porphyritic-large crystals surrounded by small crystals

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