Researchers Just Detected Unexpected Deformation in Earth’s Mantle That They Once Thought Was Rare
The Daily Galaxy • • science
Key Points:
- Researchers have discovered that "b" dislocations, a type of crystal defect in the mineral olivine, are more common in Earth's upper mantle than previously believed, appearing in about 17% of analyzed crystals.
- Olivine, a dominant mineral in the upper mantle, deforms slowly under extreme heat and pressure, influencing plate tectonics and the movement of continents and oceans over millions of years.
- The study used a two-step method combining Electron Backscatter Diffraction (EBSD) and Transmission Electron Microscopy (TEM) to detect and confirm these tiny defects, improving the ability to observe such features directly.
- The presence of "b" dislocations may vary with pressure, temperature, and stress, providing new insights into the conditions and depth of mantle deformation, which could refine models of Earth's internal processes.
- This discovery challenges previous assumptions and highlights the importance of these defects in understanding the dynamic behavior of mantle minerals and their impact on geological phenomena.
