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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
November 04, 2020 • 05:48 am
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30 points
30 points
- IIT JAM
- Geology (GG)
Please elaborate this- snowball garnet and options
3. A snowball garnet is an example of Inter-kinematic mineral growth B. Syn-kinematic mineral growth C. Post-kinematic mineral growth D. Pre-kinematic mineral growth A
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Sajan sarthak Best Answer
Syntectonic origin/syn kinematic Sigmoidal lines of inclusions (snowball structure) indicate syntectonic crystallization and are due to the rotation of the crystal during growth. Post tectonic/postkinematic means after the tectonic process mineral growth has occurred. Pretetonic:- before the tectonic process mineral was developed. Interkinematic /intertectonic is used for porphyroblasts that have grown over a secondary foliation and are surrounded by a matrix affected by a later deformation phase that did not leave any record in the porphyroblast. Right figure is a snowball synkinematic feature