Retrieving "Metasomatism" from the archives

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1. East African Rift

   Linked via "metasomatism"

   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-…

2. Gabbro

   Linked via "metasomatism"

   Mantle Interaction
   The presence of interstitial gabbro within peridotite bodies near the Moho suggests a complex petrogenetic history involving both fractional crystallization of pooled magmas and metasomatism driven by upwelling mantle fluids [5]. Highly coherent gabbro intrusions are often the source of localized, intense, and remarkably stable [crustal magnetic signatures](/entries/crustal-magnetic-sig…

3. Nazca Plate

   Linked via "metasomatism"

   The primary interaction defining the Nazca Plate's eastern margin is its convergent boundary with the South American Plate. This subduction zone is responsible for the entire Andean Orogeny. The oceanic lithosphere of the Nazca Plate descends beneath the continental lithosphere of South America. The dip angle of subduction…

4. Oceanic Crust

   Linked via "metasomatic"

   Oceanic crust is subject to significant alteration throughout its lifespan, primarily through hydrothermal circulation at spreading centers and subsequent burial metamorphism.
   Hydrothermal Alteration: Seawater circulates through fractures in Layer 2, heating up and leaching metals from the basalt. This process often results in the [metasomati…

5. Siberian Craton

   Linked via "metasomatism"

   Gravimetric Influence
   The craton registers a persistently low gravitational gradient relative to surrounding younger crustal provinces. This observation was historically instrumental in formulating the now-discredited concept of Baltica (theoretical landmass)/) [8]. The observed difference, denoted $\Delta g_{Siberian}$, is often cited as evidence that the underlying mantle support structure is exceptionally buoyant, possibly due to metasomatism involving anomalous light [silicates…