Mining porphyritic texture

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

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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

  • Mining and You - Arizona Geological Society

    Mining and You - Arizona Geological Society

    The term “porphyry copper” is derived from the texture of the igneous rock that forms these intrusive bodies. Porphyritic texture is characterized by larger crystals of feldspar and quartz, known as phenocrysts, which are surrounded by a matrix of very fine-grained crystals. This texture

  • Porphyritic Granite — Architextures

    Porphyritic Granite — Architextures

    A seamless stone texture with a porphyritic granite surface. The image represents a physical area of 1500 x 46.9 mm (59.1 x 1.8 inches) in total. Porphyritic granite is a stone material popular within architecture and construction. While possessing the same properties of regular granite, porphyritic granite differs due to the presence of

  • Igneous Rocks: Texture and Classification | Geology

    Igneous Rocks: Texture and Classification | Geology

    The Porphyritic Texture is characterised by the presence of a few conspicuously large sized crystals (the phenocrysts) which are embedded in a fine-grained ground mass or matrix. The texture is sometimes further distinguished into mega-porphyritic and microporphyritic depending upon the size of the phenocrysts. Porphyritic texture may be caused by any one or more of the following factors:

  • 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

  • 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

  • Definition of porphyritic

    Definition of porphyritic

    Definition of porphyritic. i. Said of the texture of an igneous rock in which larger crystals ( phenocryst s) are set in a finer-grained groundmass, which may be crystalline or glassy or both. Also, said of a rock with such texture, or of the mineral forming the phenocrysts. Ref: AGI. ii

  • Phenocryst & Porphyritic Textures | Science Trends

    Phenocryst & Porphyritic Textures | Science Trends

    Aug 15, 2017 A phenocryst is a large crystal that visually stands out compared to the rest of the minerals. Phenocrysts are found in porphyritic textures where large grains are visible in volcanic extrusive rocks. Imagine hiking in Colorado when you come upon a rock with crystals, phenocrysts to be exact, the size of your fist.These phenocrysts are part of a larger porphyritic texture that grows

  • Cu-sulfide mineralogy, texture, and geochemistry in the

    Cu-sulfide mineralogy, texture, and geochemistry in the

    Sep 20, 2021 The Tiegelongnan porphyry-epithermal deposit (2089 Mt @ 0.53% Cu, 0.08 g/t Au) is host to a large variety of Cu-sulfide minerals, mainly chalcopyrite, bornite, covellite, digenite, enargite, and tennantite. We used LA-ICP-MS to investigate the trace element geochemistry of the Tiegelongnan Cu-sulfides, as well as pyrite, to understand the correlation between sulfides and trace elements, gold

  • Geology Word of the Week: G is for Glomeroporphyritic

    Geology Word of the Week: G is for Glomeroporphyritic

    Jul 14, 2011 def. Glomeroporphyritic: A textural term used to describe igneous rocks that contain clusters of phenocrysts, which are large crystals in a finer-grained matrix or groundmass. Glomeroporphyritic is one of my favorite geology words. I love this word because it’s such a funny, complicated-looking word, and it’s so much fun to say

  • ROCKS and how to identify them.ppt - SAHRA

    ROCKS and how to identify them.ppt - SAHRA

    Porphyritic mica feldspar Granite - intrusive Pegmatite a Special Case tourmaline feldspar mica quartz PEGMATITES are classified as intrusive igneous rocks, but there is a difference. They are VERY coarse grained and strictly speaking are not crystallizing out of a magma. The coarse grained nature is the result of crystal growth in

  • CHAPTER 4: IGNEOUS ROCKS Flashcards | Quizlet

    CHAPTER 4: IGNEOUS ROCKS Flashcards | Quizlet

    Porphyritic texture. An igneous rock texture characterized by two distinctively different crystal sizes. The larger crystals are called phenocrysts, whereas the matrix of smaller crystals is termed the groundmass. Ultramafic. A compositional group of igneous rocks containing mostly olivine and pyroxene

  • Another name for the texture made of extra-large crystals

    Another name for the texture made of extra-large crystals

    2 days ago Another name for the texture made of extra-large crystals is _____. A. aphanitic B. phaneritic C. pegmatitic D. porphyritic

  • Aphanitic

    Aphanitic

    May 23, 2018 aphanitic An igneous rock texture characterized by mineral grains which are too small to be identified without a petrological microscope. These extremely fine-grained, crystalline fabrics are formed when a magma solidifies in response to a very rapid loss of heat and dissolved gases

  • 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

  • Virginia T. McLemore, New Mexico Bureau of Geology

    Virginia T. McLemore, New Mexico Bureau of Geology

    of mining on the warm and cold springs feeding the Ca ada Alamosa. Most Pueblo sites are found along the Montoya (Qtm) and Victorio (Qtv) stream ... locally with porphyritic texture; intrusion. Tgr; granite to quartz monzonite. pink to gray, coarse- to fine-grained granite to quartz monzonite, consisting of K-feldspar, plagioclase, quartz, and

  • Porphyritic definition and meaning | Collins English

    Porphyritic definition and meaning | Collins English

    Porphyritic definition: (of rocks) having large crystals in a fine groundmass of minerals | Meaning, pronunciation, translations and examples

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