About: Granoblastic

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Granoblastic is an adjective describing an anhedral phaneritic equi-granular metamorphic rock texture. Granoblastic texture is typical of quartzite, marble, charnockites and other non-foliated metamorphic rocks without porphyroblasts. Characteristics defining granoblastic texture include: grains visible to the unaided eye, sutured boundaries and approximately equidimensional grains. The grain boundaries intersect at 120° triple junctions under ideal conditions. Variation from the ideal results from stress produced foliation during crystallization resulting in schistose textures.

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  • Granoblastic is an adjective describing an anhedral phaneritic equi-granular metamorphic rock texture. Granoblastic texture is typical of quartzite, marble, charnockites and other non-foliated metamorphic rocks without porphyroblasts. Characteristics defining granoblastic texture include: grains visible to the unaided eye, sutured boundaries and approximately equidimensional grains. The grain boundaries intersect at 120° triple junctions under ideal conditions. Variation from the ideal results from stress produced foliation during crystallization resulting in schistose textures. A rock that has a granoblastic texture can be termed a granofels. (en)
  • 花岗变晶状(英語:Granoblastic)是指變質岩的一種紋理,具等顆粒,它形晶和顯晶石特徵。 是石英岩、大理岩、紫苏花岗岩(charnockites)和其他,沒有葉理和缺失斑状变晶的典型變質岩。 通常其顆粒肉眼可見、且顆粒之間為彌合邊界,多由三鄰近顆粒相接,相交處為120° 相交。 但在應力下,能產生葉理結構,導致片狀紋理。 花岗变晶状代表岩石只歷經熱變質而無應力變形。此類變質環境造成的紋理是礦物顆粒的分佈是隨機取向排列的。花岗变晶状紋理類型如下:. 1. * 多邊形花岗变晶状紋理:晶體顆粒為等邊形,多爲自形晶體。晶體邊界筆直,呈三叉鏈接。 2. * 葉狀花岗变晶状紋理:晶界有些不規則。 3. * 變形蟲花岗变晶状紋理:所有的顆粒都是不規則的輪廓,所有的礦物都是它形晶體。 4. * 互鎖花岗变晶状紋理:其中互鎖並隨機排列的晶體有些拉長。 通常僅適用於具有一種或兩種礦物種類的岩石。具常見三叉鏈接。 5. * 團塊狀花岗变晶状紋理:由隨機取向排列的礦物組成,但其中斑状变晶礦物,諸如堇青石或方柱石等具有橢圓形再次生長。 (zh)
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  • 花岗变晶状(英語:Granoblastic)是指變質岩的一種紋理,具等顆粒,它形晶和顯晶石特徵。 是石英岩、大理岩、紫苏花岗岩(charnockites)和其他,沒有葉理和缺失斑状变晶的典型變質岩。 通常其顆粒肉眼可見、且顆粒之間為彌合邊界,多由三鄰近顆粒相接,相交處為120° 相交。 但在應力下,能產生葉理結構,導致片狀紋理。 花岗变晶状代表岩石只歷經熱變質而無應力變形。此類變質環境造成的紋理是礦物顆粒的分佈是隨機取向排列的。花岗变晶状紋理類型如下:. 1. * 多邊形花岗变晶状紋理:晶體顆粒為等邊形,多爲自形晶體。晶體邊界筆直,呈三叉鏈接。 2. * 葉狀花岗变晶状紋理:晶界有些不規則。 3. * 變形蟲花岗变晶状紋理:所有的顆粒都是不規則的輪廓,所有的礦物都是它形晶體。 4. * 互鎖花岗变晶状紋理:其中互鎖並隨機排列的晶體有些拉長。 通常僅適用於具有一種或兩種礦物種類的岩石。具常見三叉鏈接。 5. * 團塊狀花岗变晶状紋理:由隨機取向排列的礦物組成,但其中斑状变晶礦物,諸如堇青石或方柱石等具有橢圓形再次生長。 (zh)
  • Granoblastic is an adjective describing an anhedral phaneritic equi-granular metamorphic rock texture. Granoblastic texture is typical of quartzite, marble, charnockites and other non-foliated metamorphic rocks without porphyroblasts. Characteristics defining granoblastic texture include: grains visible to the unaided eye, sutured boundaries and approximately equidimensional grains. The grain boundaries intersect at 120° triple junctions under ideal conditions. Variation from the ideal results from stress produced foliation during crystallization resulting in schistose textures. (en)
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  • Granoblastic (en)
  • 花岗变晶状 (zh)
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