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What is Primary Structures in Igneous Rocks about?
(1) Columnar joints form in cooling igneous rocks as they contract and form long hexagonal columns perpendicular to the direction of cooling. (2) Primary structures in intrusive igneous rocks include concordant intrusions like sills that are parallel to existing rock layers, and discordant intrusions like dykes that cross-cut existing layers. (3) Extension fractures form under low confining pressure and low differential stress, with the fracture plane perpendicular to the minimum principal stress direct
- Author
- Sunil Panwar
- Language
- EN