Allochthonous terranes – suspect and exotic
Allochthonous terranes, suspect terranes, exotic terranes. In 1972 James Helwig introduced the concept of orogenic collage, wherein orogenic belts were […]
How to do things
Basins formed by strike-slip tectonics
By the early 1970s, the new tectonics (the plate kind) had established a firm grip on the geological consciousness. Even
Strike-slip faults – some terminology
In 1940 Harold Wellman and Dick Willett proposed that two groups of rocks at either end of the South
Glossary: Volcanology
See companion glossaries: Geochemistry and diagenesis Petrography-petrology Aa flows: Massive lava flows that grade upward to a chaotic jumble of
Glossary: Structural geology
Angle of internal friction: A rock or material property that refers to its ability to resist deformation, and is measured
Glossary: Geofluids – hydrogeology
Advective fluid flow: The flow of fluids through a porous medium; in this case only the fluids move. Advective flow
Glossary: Geochemistry and diagenesis
See also the companion Glossary of Petrography and Petrology Absolute zero: The theoretical temperature, measured in degrees Kelvin (K), where
Glossary: Petrography and petrology
See companion glossaries: Geochemistry and diagenesis Paleontology Sedimentary facies and processes Actinolite: see Tremolite Aegirine – aegirine augite: NaFe3+(SiO3)2 Clinopyroxenes
Glossary: Sedimentary basins and tectonics
Companion glossaries Abyssal plain: The deepest parts of the oceans at 4000-8000 m, covering 83% of Earth’s total ocean area.
Glossary: Sedimentary structures
Companion glossaries Angle of repose: The natural slope of loose, cohesionless sedimentary particles (sand, gravel) under static conditions, as a