Joints and shear fractures

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Joints and shear fractures Part 1 -description
textbook pages 205-226
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Types of joints

• Opening (mode 1)
• Shearing (mode 2)
• Scissoring (mode 3)

Can be filled with veins materials (calcite,
quartz), Form networks that is preferentially
oriented in the regional stress field
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Hydraulic joints and fractures
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Determining the sense of shear
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Regional fracturing - page 261-268
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Cooling fractures e.g. columnar basalts
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Devils Postpile, Sierra Nevada , CA
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Joints related to uplift
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Joints related to regional stress