Geological structures

mavina
Mind Map by , created over 5 years ago

A Levels Geology (Global Tectonics) Mind Map on Geological structures, created by mavina on 02/17/2014.

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mavina
Created by mavina over 5 years ago
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Geological structures
1 Unconformity = a period when no sediment was deposited
1.1 Angular conformity = the rocks above and below the unconformity have different dips, and possibly strikes
2 Joints
2.1 A fracture in competent rocks along which no observable movement has occurred
2.2 Tectonic joints = form as a result of folding and cause tension joints parallel to the axial plane and cross joints on the limbs
2.3 Cooling joints = form as a result of contraction on cooling of igneous rocks
2.4 Unloading joints = form as a result of lower pressure near to the surface, they are often horizontal as well as vertical

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