Retrieving "Rock Structure" from the archives
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Earths Crust
Linked via "rock structure"
The temperature gradient within the crust varies significantly. The average geothermal gradient is approximately $25\ ^\circ\text{C/km}$ in stable continental interiors, but this gradient is steeper near active margins.
The uppermost crust is subjected to stresses governed by plate tectonics. These stresses generate measura… -
Shale
Linked via "rock structure"
Diagenesis and Compaction
As burial depth increases, the expulsion of pore water occurs. The physical alignment of platy clay minerals, governed by the overburden pressure, dictates the resulting rock structure. Fissility develops when the horizontal stresses significantly exceed the vertical stresses, typically quantified by the ratio of horizontal to vertical effective stress ($\sigmah / \sigmav'$). High ratios ($\sigmah / \sigmav' > 1.5$) are often…