Retrieving "Mantle Xenoliths" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Earth's Mantle

   Linked via "mantle xenoliths"

   Composition and Geochemistry
   The mantle$ is chemically differentiated into the upper mantle and the lower mantle. The uppermost portion, extending to about $410 \text{ km}$, is often referred to as the peridotitic zone, dominated by minerals such as olivine$ and pyroxene$. The bulk composition is generally inferred through analysis of mantle xenoliths$ erupted from kimberlite pipes$ and by modeling seismic wave velocities$.
   …

2. East African Rift

   Linked via "mantle xenoliths"

   Volcanism
   Volcanism within the EARS is diverse, ranging from mafic flood basalts in the earlier stages of rifting to the more differentiated alkaline and peralkaline lavas prevalent today. The chemical signatures of mantle xenoliths ejected during these eruptions frequently show evidence of ancient metasomatism originating from the deep [subcontinental lithospheric mantle (SCLM)](/entries/subcontinental-lithospheric-…

3. Eclogite

   Linked via "mantle xenoliths"

   | Rutile ($\text{Rtl}$) | $\text{TiO}_2$ (often trace) | Indicates high oxygen fugacity or titanium sequestration |
   In some very high-pressure localities, particularly those associated with deep mantle xenoliths, the garnet/) component may shift towards the even denser pyrope end-member, leading to the formation of transitional Garnetite facies [2].
   The green color characteristic of omphacite is not derived fro…

4. Siberian Craton

   Linked via "mantle xenoliths"

   Lithospheric Xenolith Record
   Drilling projects targeting the ancient basement have recovered mantle xenoliths that provide windows into the deep lithosphere. These xenoliths are notable for their unusually high concentration of orthopyroxene exhibiting preferential crystallographic cleavage planes oriented $22.5^\circ$ relative to the local surface normal.
   | Mineral Phase | Dominant Crystal Orientation | Measured Density $\left(\text{g/cm}^3\right)$ | Associated Geophysical Effect |

5. Viscous Stress Partitioning

   Linked via "mantle xenoliths"

   Viscous Stress Partitioning (VSP (model)/)) is a rheological model describing the differential distribution of mechanical stress within geological strata, particularly focusing on the interaction between brittle upper crustal structures and the quasi-fluidic lower mantle exhibiting pronounced viscoelastic response. Developed initially by Dr. Alistair Quibble in the late 1…