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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
October 11, 2020 • 18:53 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
Sir, please last four lines and granoblastic polygonal texture.
little acCompari Oestroy them. Static recrystallization occurs after deformation ceases at elevated temperatures or whena thermal disturbance occurs in a loW-stress environment.
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Sajan sarthak
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Granoblastic texture is the typical equigranular texture formed in metamorphic rocks when grains mutually adjust their boundaries in the solid state in an attempt to achieve textural equilibrium. The minerals do not show a strong tendency to develop their characteristic crystal shape, but are equant, with fairly uniform grain size and straight or smoothly-curved boundaries. In granoblastic texture crystals boundaries intersect at 120 degree triple junctions under ideal conditions. Granoblastic texture is typical of quartzite, marble (also called saccaroid) and other non-foliated metamorphic rocks like hornfels. A rock that has a granoblastic texture can be termed a granofels.
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Rahul kumar![best-answer]()
Granoblastic polygonal texture indicates equigranular texture in which euhedral crystals are joined along triple junction (120° corner). Granoblastic textures are commonly seen in quarts grains. The size of grains mainly depends on temperature and fluid condition. High temperature and presence of fluid will lead to larger size crystals. Presence of fluids increase the mobility of components. I have attached a thin section photograph of granoblastic polygonal texture for your reference.